ORCID Profile
0000-0002-1357-3727
Current Organisation
Curtin University
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Functional Materials | Physical Chemistry (Incl. Structural) | Nanomaterials | Electrochemistry | Condensed Matter Physics—Structural Properties | Nanotechnology | Materials Engineering | Electroanalytical Chemistry | Surfaces and Structural Properties of Condensed Matter | Nanoscale Characterisation | Materials Engineering Not Elsewhere Classified | Chemical Characterisation of Materials | Structural Biology (incl. Macromolecular Modelling) | Analytical Chemistry | Catalysis and Mechanisms of Reactions | Electrochemistry | Structural Chemistry and Spectroscopy | Condensed Matter Characterisation Technique Development | Mineralogy and Crystallography | Biochemistry and Cell Biology | Condensed Matter Physics | Chemistry Of Catalysis | Food Chemistry and Molecular Gastronomy (excl. Wine) | Environmental Management And Rehabilitation | Compound Semiconductors | Reaction Kinetics And Dynamics | Quantum Chemistry | Chemical Engineering | Chemical Engineering Not Elsewhere Classified | Chemotherapy | Inorganic Geochemistry | Interdisciplinary Engineering Not Elsewhere Classified | Medical Biochemistry: Proteins and Peptides (incl. Medical Proteomics) | Medical Biochemistry: Inorganic Elements and Compounds | Atomic and Molecular Physics | Physical Chemistry of Materials | Biological And Medical Chemistry | Organic Chemical Synthesis | Microelectronics and Integrated Circuits | Resources Engineering Not Elsewhere Classified | Photodetectors, Optical Sensors and Solar Cells | Analytical Spectrometry | Organic Chemistry | Separation Science | Medicinal and Biomolecular Chemistry | Colloid and Surface Chemistry | Biomaterials | Macromolecular and Materials Chemistry | Inorganic Chemistry | Solid State Chemistry | Bioinorganic Chemistry | Sensor (Chemical And Bio-) Technology | Inorganic Green Chemistry | Cellular Interactions (incl. Adhesion, Matrix, Cell Wall) | Industrial Chemistry | Medical Biochemistry and Metabolomics | Chemical Engineering not elsewhere classified | Macromolecular and Materials Chemistry not elsewhere classified | Soil Chemistry (excl. Carbon Sequestration Science) | Crop and Pasture Biochemistry and Physiology | Soft Condensed Matter | Analytical Biochemistry | Cell Development, Proliferation and Death
Expanding Knowledge in the Chemical Sciences | Chemical sciences | Expanding Knowledge in Engineering | Physical sciences | Fuel Cells (excl. Solid Oxide) | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Biological Sciences | Scientific Instruments | Energy transformation | Management of Liquid Waste from Mineral Resource Activities (excl. Water) | Management of Solid Waste from Mineral Resource Activities | Emerging Defence Technologies | Inorganic Industrial Chemicals | Solid Oxide Fuel Cells | Mining and Extraction of Precious (Noble) Metal Ores | Health not elsewhere classified | Expanding Knowledge in History and Archaeology | Technological and organisational innovation | Other | Gas distribution | Hydrogen Storage | Cancer and related disorders | Biofuel (Biomass) Energy | Industrial chemicals and related products | Oil and Gas Exploration | Human Pharmaceutical Treatments (e.g. Antibiotics) | Management of Greenhouse Gas Emissions from Electricity Generation | Biological sciences | Earth sciences | Clinical health not specific to particular organs, diseases and conditions | Structural Metal Products | Integrated Circuits and Devices | Manufactured products not elsewhere classified | Global climate change adaptation measures | Organic industrial chemicals not classified elsewhere | Energy Transformation not elsewhere classified | Oil and gas | Expanding Knowledge in the Medical and Health Sciences | Expanding Knowledge in Technology | Energy transformation not elsewhere classified | First stage treatment of ores and minerals | Expanding Knowledge in the Environmental Sciences | Expanding Knowledge in the Earth Sciences | Industrial Chemicals and Related Products not elsewhere classified | Expanding Knowledge in the Agricultural and Veterinary Sciences |
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3AN00464C
Abstract: Cyclic voltammetry (CV), synchrotron radiation-X-ray photoelectron spectroscopy (SR-XPS) and near edge X-ray absorption fine structure (NEXAFS) show that oxidation of ferrocene tagged PVC induces an accumulation of high molecular weight polymer at the buried interface between the substrate electrode and the plasticized membrane.
Publisher: Elsevier BV
Date: 02-2006
Publisher: Springer Science and Business Media LLC
Date: 27-06-2008
Publisher: Elsevier BV
Date: 2006
Publisher: Elsevier BV
Date: 02-2000
Publisher: Wiley
Date: 08-11-2019
Abstract: Water‐splitting photoanodes based on semiconductor materials typically require a dopant in the structure and co‐catalysts on the surface to overcome the problems of charge recombination and high catalytic barrier. Unlike these conventional strategies, a simple treatment is reported that involves soaking a s le of pristine BiVO 4 in a borate buffer solution. This modifies the catalytic local environment of BiVO 4 by the introduction of a borate moiety at the molecular level. The self‐anchored borate plays the role of a passivator in reducing the surface charge recombination as well as that of a ligand in modifying the catalytic site to facilitate faster water oxidation. The modified BiVO 4 photoanode, without typical doping or catalyst modification, achieved a photocurrent density of 3.5 mA cm −2 at 1.23 V and a cathodically shifted onset potential of 250 mV. This work provides an extremely simple method to improve the intrinsic photoelectrochemical performance of BiVO 4 photoanodes.
Publisher: American Chemical Society (ACS)
Date: 27-06-2012
DOI: 10.1021/AC301096R
Abstract: Seawater analysis is one of the most challenging in the field of environmental monitoring, mainly due to disparate concentration levels between the analyte and the salt matrix causing interferences in a variety of analytical techniques. We propose here a miniature electrochemical s le pretreatment system for a rapid removal of NaCl utilizing the coaxial arrangement of an electrode and a tubular Nafion membrane. Upon electrolysis, chloride is deposited at the Ag electrode as AgCl and the sodium counterions are transported across the membrane. This cell was found to work efficiently at potentials higher than 400 mV in both stationary and flow injection mode. Substantial residual currents observed during electrolysis were found to be a result of NaCl back diffusion from the outer side of the membrane due to insufficient permselectivity of the Nafion membrane. It was demonstrated that the residual current can be significantly reduced by adjusting the concentration of the outer solution. On the basis of ion chromatography results, it was found that the designed cell used in flow injection electrolysis mode reduced the NaCl concentration from 0.6 M to 3 mM. This attempt is very important in view of nutrient analysis in seawater where NaCl is a major interfering agent. We demonstrate that the pretreatment of artificial seawater s les does not reduce the content of nitrite or nitrate ions upon electrolysis. A simple diffusion/extraction steady state model is proposed for the optimization of the electrolysis cell characteristics.
Publisher: American Chemical Society (ACS)
Date: 17-06-2010
DOI: 10.1021/AC101009N
Abstract: This paper reports on three-dimensional synchrotron radiation/Fourier transform-infrared microspectroscopy (SR/FT-IRM) imaging studies of water inclusions at the buried interface of solid-contact-ion-selective electrodes (SC-ISEs). It is our intention to describe a nondestructive method that may be used in surface studies of the buried interfaces of materials, especially multilayers of polymers. Herein, we demonstrate the power of SR/FT-IRM for studying water inclusions at the buried interfaces of SC-ISEs. A poly(methyl methacrylate)-poly(decyl methacyrlate) [PMMA-PDMA] copolymer revealed the presence of micrometer sized inclusions of water at the gold/membrane interface, while a coupling of a hydrophobic solid contact of poly(3-octylthiophene 2,5-diyl) (POT) prevented the accumulation of water at the buried interface. A similar study with a poly (3,4-ethylenedioxythiophene) oly (styrenesulfonate) [PEDOT/PSS] solid contact also revealed an absence of distinct micrometer-sized pools of water however, there were signs of absorption of water accompanied by swelling of the PEDOT/PSS underlayer, and these membrane zones are enriched with respect to water.
Publisher: American Chemical Society (ACS)
Date: 15-10-2009
DOI: 10.1021/EF901015G
Publisher: Elsevier BV
Date: 08-1998
Publisher: Springer Science and Business Media LLC
Date: 2002
Publisher: Elsevier BV
Date: 15-06-0002
DOI: 10.1016/J.TALANTA.2008.01.018
Abstract: A bielectrode array comprising a jalpaite membrane (i.e., Ag(1.5)Cu(0.5)S) copper(II) ion-selective electrode (ISE) and chalcogenide glass membrane (i.e., Fe(2.5)(Se(60)Ge(28)Sb(12))(97.5)) iron(III) ISE has been assembled by in idually wiring each solid-state sensor into a single electrode body. Furthermore, a dual metal ion buffer calibration standard incorporating copper(II) and iron(III) coordinating ligands to regulate the levels of free copper(II) and iron(III) in the buffer has been developed to enable simultaneous calibration of the bielectrode ISE array. In this work, the bielectrode ISE array has been employed in the continuous flow analysis (CFA) of free copper(II) and iron(III) in seawater media. It is shown that the in idual electrodes displayed Nernstian response in the metal ion buffer calibration standard over a wide dynamic range (viz., 10(-15) to 10(-5) M aCu(2+) and 10(-21) to 10(-11) M aFe(3+)), and the results of repetitive CFA analyses of free copper(II) and iron(III) in seawater are commensurate with the typical values found in coastal seawater s les. Clearly, the bielectrode ISE array may be used in the simultaneous analysis of free copper(II) and iron(III) in seawater without fear of cross-interference between the solid-state sensors.
Publisher: Wiley
Date: 04-07-2016
Publisher: Wiley
Date: 12-2007
Publisher: Elsevier BV
Date: 11-2004
Publisher: Elsevier BV
Date: 1987
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0CP02036B
Abstract: Both Keggin-type phosphotungstic acid (HPW) and Pd are not prominent catalysts towards the oxygen reduction (ORR), but their composite Pd-HPW catalyst produces a significantly higher electrochemical activity for the ORR in acidic media. The novel composite catalyst was synthesized by self-assembly of HPW on multi-walled carbon nanotubes (MWCNTs) via the electrostatic attraction between negatively charged HPW and positively charged poly(diallyldimethylammonium (PDDA)-wrapped MWCNTs, followed by dispersion of Pd nanoparticles onto the HPW-PDDA-MWCNT assembly. The as-prepared catalyst was characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). TEM images show that Pd nanoparticles were uniformly dispersed on the surface of MWCNTs even when the Pd loading was increased to 60 wt%. Electrochemical activity of the catalysts for the ORR was evaluated by steady state polarization measurements using a rotating disk electrode. Compared with the acid treated MWCNTs, Pd nanoparticles supported on the HPW-assembled MWCNTs show a much higher ORR activity that is comparable to conventional Pt/C catalysts. The high electrocatalytic activities could be related to high dispersion of Pd nanoparticles as well as synergistic effects originating from the high proton conductivity of HPW. The Pd/HPW-PDDA-MWCNTs system as the cathode catalyst in proton exchange membrane fuel cells is demonstrated.
Publisher: The Electrochemical Society
Date: 2017
DOI: 10.1149/2.1051714JES
Publisher: The Electrochemical Society
Date: 2005
DOI: 10.1149/1.1823991
Publisher: Association for Materials Protection and Performance (AMPP)
Date: 04-2002
DOI: 10.5006/1.3287686
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A801244J
Publisher: American Chemical Society (ACS)
Date: 31-01-2007
DOI: 10.1021/JA067219J
Abstract: Electrocrystallization of single nanowires and/or crystalline thin films of the semiconducting and magnetic Co[TCNQ]2(H2O)2 (TCNQ=tetracyanoquinodimethane) charge-transfer complex onto glassy carbon, indium tin oxide, or metallic electrodes occurs when TCNQ is reduced in acetonitrile (0.1 M [NBu4][ClO4]) in the presence of hydrated cobalt(II) salts. The morphology of the deposited solid is potential dependent. Other factors influencing the electrocrystallization process include deposition time, concentration, and identity of the Co2+(MeCN) counteranion. Mechanistic details have been elucidated by use of cyclic voltammetry, chrono erometry, electrochemical quartz crystal microbalance, and galvanostatic methods together with spectroscopic and microscopic techniques. The results provide direct evidence that electrocrystallization takes place through two distinctly different, potential-dependent mechanisms, with progressive nucleation and 3-D growth being controlled by the generation of [TCNQ]*- at the electrode and the diffusion of Co2+(MeCN) from the bulk solution. Images obtained by scanning electron microscopy reveal that electrocrystallization of Co[TCNQ]2(H2O)2 at potentials in the range of 0.1-0 V vs Ag/AgCl, corresponding to the [TCNQ]0/*- diffusion-controlled regime, gives rise to arrays of well-separated, needle-shaped nanowires via the overall reaction 2[TCNQ]*-(MeCN)+Co2+(MeCN)+2H2O right harpoon over left harpoon {Co[TCNQ]2(H2O)2}(s). In this potential region, nucleation and growth occur at randomly separated defect sites on the electrode surface. In contrast, at more negative potentials, a compact film of densely packed, uniformly oriented, hexagonal-shaped nanorods is formed. This is achieved at a substantially increased number of nucleation sites created by direct reduction of a thin film of what is proposed to be cobalt-stabilized {(Co2+)([TCNQ2]*-)2} dimeric anion. Despite the potential-dependent morphology of the electrocrystallized Co[TCNQ]2(H2O)2 and the markedly different nucleation-growth mechanisms, IR, Raman, elemental, and thermogravimetric analyses, together with X-ray diffraction, all confirmed the formation of a highly pure and crystalline phase of Co[TCNQ]2(H2O)2 on the electrode surface. Thus, differences in the electrodeposited material are confined to morphology and not to phase or composition differences. This study highlights the importance of the electrocrystallization approach in constructing and precisely controlling the morphology and stoichiometry of Co[TCNQ]2-based materials.
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B603402K
Abstract: Global biosecurity threats such as the spread of emerging infectious diseases (i.e., avian influenza, SARS, Hendra, Nipah, etc.) and bioterrorism have generated significant interest in recent years. There is considerable effort directed towards understanding and negating the proliferation of infectious diseases. Biosensors are an attractive tool which have the potential to detect the outbreak of a virus and/or disease. Although there is a host of technologies available, either commercially or in the scientific literature, the development of biosensors for the detection of emerging infectious diseases (EIDs) is still in its infancy. There is no doubt that the glucose biosensor, the gene chip, the protein chip, etc. have all played and are still playing a significant role in monitoring various biomolecules. Can biosensors play an important role for the detection of emerging infectious diseases? What does the future hold and which biosensor technology platform is suitable for the real-time detection of infectious diseases? These and many other questions will be addressed in this review. The purpose of this review is to present an overview of biosensors particularly in relation to EIDs. It provides a synopsis of the various types of biosensor technologies that have been used to detect EIDs, and describes some of the technologies behind them in terms of transduction and bioreceptor principles.
Publisher: Elsevier BV
Date: 09-2006
Publisher: Wiley
Date: 17-05-2016
Publisher: American Chemical Society (ACS)
Date: 10-1994
DOI: 10.1021/AC00091A033
Publisher: Informa UK Limited
Date: 19-08-2009
Publisher: Elsevier BV
Date: 11-2006
Publisher: Wiley
Date: 17-05-2022
DOI: 10.1111/RESP.14296
Abstract: The US Preventive Task Force (USPSTF) has updated screening criteria by expanding age range and reducing smoking history required for eligibility the International Lung Screen Trial (ILST) data have shown that PLCOM2012 performs better for eligibility than USPSTF criteria. Screening adherence is low (4%–6% of potential eligible candidates in the United States) and depends upon multiple system and patient/candidate‐related factors. Smoking cessation in lung cancer improves survival (past prospective trial data, updated meta‐analysis data) smoking cessation is an essential component of lung cancer screening. Circulating biomarkers are emerging to optimize screening and early diagnosis. COVID‐19 continues to affect lung cancer treatment and screening through delays and disruptions specific operational challenges need to be met. Over 70% of suspected malignant lesions develop in the periphery of the lungs. Bronchoscopic navigational techniques have been steadily improving to allow greater accuracy with target lesion approximation and therefore diagnostic yield. Fibre‐based imaging techniques provide real‐time microscopic tumour visualization, with potential diagnostic benefits. With significant advances in peripheral lung cancer localization, bronchoscopically delivered ablative therapies are an emerging field in limited stage primary and oligometastatic disease. In advanced stage lung cancer, small‐volume s les acquired through bronchoscopic techniques yield material of sufficient quantity and quality to support clinically relevant biomarker assessment.
Publisher: Royal Society of Chemistry (RSC)
Date: 1997
DOI: 10.1039/A700771J
Publisher: American Chemical Society (ACS)
Date: 15-01-2000
DOI: 10.1021/AC990603X
Abstract: The response mechanism of the iron(III) chalcogenide glass membrane ion-selective electrode (ISE) in saline media has been studied using electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). EIS equivalent circuits and XPS surface compositions for the FeIII ISE are consistent with the presence of two surface films probably comprising a outer surface layer (OSL) and an Fe-deficient modified surface layer (MSL), along with a low-frequency charge-transfer impedance that is attributable to the reduction of Fe3+. In accordance with literature data for the conductivity of low-bearing iron(III) chalcogenide glasses, a high-impedance MSL is internally consistent with XPS data for an Fe-deficient MSL. It is evident that the impedance of the MSL diminishes on exposure to solutions containing Fe3+, and this finding is consistent with the ion exchange of Fe3+ within the MSL. Likewise, the charge-transfer impedance also decreases at elevated levels of Fe3+, demonstrating that Fe3+ is a participant in the reversible charge-transfer reaction occurring at the electrolyte/electrode interface. The kinetics of charge transfer are facilitated by Fe chelating agents (e.g., citrate, salicylate, EDTA, etc.) due presumably to the complexation of the products of the charge transfer process (possibly Fe2+). It is shown unequivocally that the response of the FeIII ISE in saline buffers is independent of pH, demonstrating that the ISE is responding directly to Fe3+, not H+. A mechanism involving a combination of charge transfer and ion exchange of FeIII, at the electrode diffusion layer, has been proposed to explain the 30 mV/decade slope of the FeIII ISE.
Publisher: Elsevier BV
Date: 05-2004
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/CH11361
Abstract: The in situ electrocrystallization of zinc tetracyanoquinodimethane (TCNQ) has been explored using synchrotron radiation-grazing incidence X-ray diffraction (SR-GIXRD) at potentials in the region of the cyclic voltammetric peak where reduction of TCNQ to TCNQ– occurs at a Pt electrode in acetonitrile (0.1 M [NBu4][PF6]) solution containing Zn(NO3)2·6H2O. The in situ SR-GIXRD data along with ex situ IR and Raman spectroscopy results all confirmed the formation of the kinetically favoured phase of Zn[TCNQ]2(H2O)2 as the product.
Publisher: American Chemical Society (ACS)
Date: 21-08-2007
DOI: 10.1021/AC071201P
Publisher: Wiley
Date: 13-12-2011
Publisher: American Chemical Society (ACS)
Date: 16-07-2009
DOI: 10.1021/EF900203H
Publisher: Elsevier BV
Date: 29-08-2003
Publisher: Elsevier BV
Date: 07-2017
Publisher: Wiley
Date: 14-11-2020
Publisher: American Chemical Society (ACS)
Date: 15-10-1998
DOI: 10.1021/AC980196+
Publisher: Springer Science and Business Media LLC
Date: 03-2004
Publisher: MDPI AG
Date: 23-06-2011
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 22-04-2002
DOI: 10.1016/S0039-9140(02)00003-6
Abstract: It is shown that the iron(III) chalcogenide glass membrane ion-selective electrode (ISE) can be calibrated in continuous flow analysis (CFA) using acidified iron(III) nitrate standards, yielding a 60+/-3 mV per decade change in activity of Fe(3+) response in the range 10(-7)-10(-2) M total iron(III). Extended ageing of the iron(III) ISE in 2 M zinc(II) sulphate did not alter the potentiometric response characteristics of the electrode. Furthermore, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy in the presence and absence of zinc(II) sulphate failed to detect a zinc(II) interference on the iron(III) ISE. CFA/ISE determined activities of Fe(3+) in synthetic zinc electrolyte containing 2x10(-3)-2x10(-1) M total iron(III) yielded results falling within +/-0.2logaFe(3+) unit of the corresponding iron speciation data calculated using the minteqa2 program.
Publisher: American Chemical Society (ACS)
Date: 14-09-2015
DOI: 10.1021/ACS.LANGMUIR.5B01693
Abstract: The transportation and accumulation of redox active species at the buried interface between glassy carbon electrodes and plasticized polymeric membranes have been studied using synchrotron radiation X-ray photoelectron spectroscopy (SR-XPS), near edge X-ray absorption fine structure (NEXAFS), in situ electrochemical Fourier transform infrared-attenuated total reflectance (FTIR-ATR) spectroscopy, cyclic voltammetry (CV), chrono erometry (CA), and electrochemical impedance spectroscopy (EIS). Ferrocene tagged poly(vinyl chloride) [FcPVC], ferrocene (Fc), and its derivatives together with tetracyanoquinodimethane (TCNQ) doped plasticized polymeric membrane electrodes have been investigated, so as to extend the study of the mechanism of this reaction chemistry to different time scales (both small and large molecules with variable diffusion coefficients) using a range of complementary electrochemical and surface analysis techniques. This study also provides direct spectroscopic evidence for the transportation and electrochemical reactivity of redox active species, regardless of the size of the electrochemically reactive molecule, at the buried interface of the substrate electrode. With all redox dopants, when CA electrolysis was performed, redox active species were undetectable (<1 wt % of signature elements or below the detection limit of SR-XPS and NEXAFS) in the outermost surface layers of the membrane, while a high concentration of redox species was located at the electrode substrate as a consequence of the deposition of the reaction product (Fc(+)-anion complex) at the buried interface between the electrode and the membrane. This reaction chemistry for redox active species within plasticized polymeric membranes may be useful in the fashioning of multilayered polymeric devices (e.g., chemical sensors, organic electronic devices, protective laminates, etc.) based on an electrochemical tunable deposition of redox molecules at the buried substrate electrode beneath the membrane.
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.LUNGCAN.2018.07.032
Abstract: Multidisciplinary team (MDT) presentation in lung cancer has the potential to improve longterm outcomes, although this varies between studies. This study aims to evaluate outcomes including survival, according to MDT presentation and to explore the utility of data obtained from local clinical sources. Prospective cases of lung cancer recorded in our institution's cancer registry were analyzed according to MDT presentation for patient and tumour characteristics, adjusted survival and referral to palliative care. 1197 cases were included, 295 (24.6%) with MDT presentation and 902 (75.4%) without. 60% of patients were male with median (IQR) age at diagnosis of 70 years (62-78). Histopathology distribution (non-small cell lung cancer and small-cell lung cancer) was similar between the two groups. Compared with the non-MDT group, the MDT group had (1) ECOG score recorded more often (71.9% vs. 47.6%), (2) higher proportion of ECOG 0 cases (31.2% vs. 11.9%) and ECOG 1 cases (28.8% vs. 20.3%), (3) higher proportion of early stage disease (stage I - 23.1% vs. 9.7% stage II - 10.2% vs. 4.8%, stage IIIA - 14.6% vs 6.3%) and (4) lower proportion of metastatic disease (stage IV - 39.3% vs. 56.1%). Referral to palliative care was incompletely recorded in both groups (MDT: n = 116/295, 39.3% non-MDT: n = 430, 47.7%) but did not differ significantly for stage IV cases. Survival analyzed by stage was greater in the MDT group at 1, 2 and 5 years for all stages except stage IIIB at 1 year post-diagnosis. Adjusted survival analysis for the entire cohort showed improved survival at 5 years for the MDT group (HR 0.7 (0.58-0.85), p < 0.001). MDT presentation is associated with improved adjusted survival for lung cancer in this single institutional cohort in an analysis of local clinical cancer registry data.
Publisher: American Chemical Society (ACS)
Date: 23-01-2023
Publisher: Wiley
Date: 08-1989
Publisher: Wiley
Date: 08-1989
Publisher: Springer Science and Business Media LLC
Date: 2001
Publisher: Association for Materials Protection and Performance (AMPP)
Date: 2001
DOI: 10.5006/1.3290335
Publisher: Elsevier BV
Date: 06-2010
Publisher: The Electrochemical Society
Date: 2005
DOI: 10.1149/1.2007227
Publisher: Elsevier BV
Date: 2021
Publisher: Wiley
Date: 29-04-2020
Publisher: American Chemical Society (ACS)
Date: 06-11-2019
DOI: 10.1021/ACS.ANALCHEM.9B03402
Abstract: Here, we provide the first experimental evidence of proton release from polyaniline (PANI) films subjected to anodic potentials at environmental pHs. We conducted an extensive characterization of unpolarized olarized PANI films-synthesized by traditional sequential voltammetric scanning-by using spectroelectrochemistry, synchrotron radiation-X-ray photoelectron spectroscopy, near edge X-ray absorption fine structure, and potentiometric pH sensing in the vicinity of the PANI layer. This new insight enables the utilization of PANI as a proton pump, which is actively tuned through an electrochemical pulse, so as to controllably acidify well-confined thin layer s les. Furthermore, we demonstrate the analytical significance of this system by measuring the alkalinity of artificial and natural water s les by using two faced planar PANI electrodes, one working as a proton source and the other one as pH electrode. Finally, the impact of this approach is 2-fold: (i) all-solid-state electrode materials may be used with devisible consequences in miniaturized and implementable submersible probes, and (ii) rapid determination of alkalinity as compared to traditional approaches together with a versatility in pH adjustment in any kind of s le, among other applications.
Publisher: American Chemical Society (ACS)
Date: 07-11-2008
DOI: 10.1021/IE800891M
Publisher: Wiley
Date: 07-2019
Publisher: Wiley
Date: 11-04-2018
DOI: 10.1111/RESP.13307
Abstract: While multidisciplinary team (MDT) care in lung cancer is widely practiced, there are few guidelines for MDT on best data collection strategies. MDT meetings need ready access to information for the provision of optimal treatment recommendations (the primary purpose of the meeting), audit of team performance and benchmarking. This study aimed to develop a practical data set designed for these goals through a recognized consensus process with health professionals who participate in formal MDT settings. A modified Delphi process with three iterations (two surveys and one consensus conference) was carried out involving over 100 Australian lung cancer MDT health professionals. In total, 122 lung cancer MDT health professionals responded to the Round 1 survey from over 350 invitees. Of the 122, 98 were available for invitation to Round 2. Of 98, 52 (53%) invitees responded to the Round 2 survey. After two rounds, 51 data elements across 8 domains (patient demographics, risk factors, biopsy data, staging, timeliness, treatment, follow-up and patient selection) achieved consensus, defined as 80% agreement. For Round 3, 33 MDT lead clinicians were invited to participate in a consensus conference. Of 33, 14 (42%) invitees distilled the 47 data elements into 23 elements across 8 domains to address the study objectives. A practical data set for lung cancer MDT to use for optimal treatment recommendations and to evaluate team performance was developed through recognized consensus methodology. Access to streamlined, relevant and feasible data collection strategies may improve MDT decision-making, audit of team performance and facilitate benchmarking.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC04876E
Abstract: We report on the first direct spectroscopic evidence of the capacitive ion-to-electron transducing mechanism of carbon nanomaterials in solid contact polymeric ion-selective electrodes (SC-ISEs).
Publisher: Elsevier BV
Date: 10-2006
Publisher: Wiley
Date: 2000
Publisher: Wiley
Date: 04-2002
DOI: 10.1002/1521-4109(200204)14:7/8<493::AID-ELAN493>3.0.CO;2-C
Publisher: Wiley
Date: 09-02-2018
Abstract: Single‐atom catalysts (SACs) are the smallest entities for catalytic reactions with projected high atomic efficiency, superior activity, and selectivity however, practical applications of SACs suffer from a very low metal loading of 1–2 wt%. Here, a class of SACs based on atomically dispersed transition metals on nitrogen‐doped carbon nanotubes (MSA‐N‐CNTs, where M = Ni, Co, NiCo, CoFe, and NiPt) is synthesized with an extraordinarily high metal loading, e.g., 20 wt% in the case of NiSA‐N‐CNTs, using a new multistep pyrolysis process. Among these materials, NiSA‐N‐CNTs show an excellent selectivity and activity for the electrochemical reduction of CO 2 to CO, achieving a turnover frequency (TOF) of 11.7 s −1 at −0.55 V (vs reversible hydrogen electrode (RHE)), two orders of magnitude higher than Ni nanoparticles supported on CNTs.
Publisher: Springer Science and Business Media LLC
Date: 02-2005
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-11-2020
Abstract: Alloying magnetic ions into halide double perovskites brings new opportunities for spintronics.
Publisher: Elsevier BV
Date: 06-2002
Publisher: Elsevier BV
Date: 04-2004
Publisher: Elsevier BV
Date: 12-2018
Publisher: Wiley
Date: 08-2018
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 12-1996
Publisher: Wiley
Date: 29-01-2008
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/CH17187
Abstract: The transformation of cadmium 7,7,8,8-tetracyanoquinodimethane (TCNQ) into a cadmium terephthalate co-ordination polymer is reported, with the chemistry of this material elucidated using elemental analysis, X-ray photoelectron spectroscopy and synchrotron radiation single-crystal X-ray diffraction. A heptacoordinated CdII linear coordination polymer catena-poly[triaqua-(μ2-benzene-1,4-dicarboxylato-κO,O′)cadmium(ii)]hydrate (1) was isolated while attempting to recrystallize Cd(TCNQ)2. Density functional theory calculations for the oxidation of benzylic carbon attached to the cyano group provided evidence that the reaction pathway proposed herein is highly exergonic and thermodynamically plausible. This structure showed a distorted pentagonal bipyramidal geometry together with a symmetrical mononuclear unit in which each CdII ion is doubly bridged by a dicarboxylato anion. Owing to the softness and minute size of these crystals, this structure had to be elucidated using synchrotron radiation X-ray crystallography.
Publisher: American Chemical Society (ACS)
Date: 07-10-2009
DOI: 10.1021/JP9062719
Abstract: As a promising high-temperature fuel cell, the direct carbon fuel cell (DCFC) has a much higher efficiency and a lower emission as compared with conventional coal-fired power plants. To develop an increased understanding of the relationship between the microstructure, surface chemistry, and electrochemical performance of coal as a fuel for the DCFC, a coal s le from Central Queensland has been subjected to various pretreatments, including acid washing, air oxidation, and pyrolysis. It has been found that an acid treatment of the coal enhanced its electrochemical reactivity due to an increase in oxygen-containing surface functional groups. By contrast, heat treatment of the coal results in a sharp decrease in the electrochemical reactivity in the DCFC due to a decrease in the oxygen-containing surface functional groups, particularly CO(2)-yielding surface groups. A higher surface area of coal may also be helpful, but much less important than surface chemistry.
Publisher: Wiley
Date: 04-2019
DOI: 10.1111/IMJ.14256
Abstract: E-cigarettes, or electronic nicotine delivery systems (ENDS), have been suggested as a potential aid for smoking cessation, but many questions about their efficacy and safety remain unanswered. Until very recently, the evidence for ENDS in smoking cessation was largely based on observational studies or randomised controlled trials with methodological flaws and did not provide adequate evidence to support strongly ENDS for smoking cessation. Concerns about the uptake of ENDS by nonsmoking populations (such as adolescents) remain. More recent evidence may indicate the effect of ENDS in smoking cessation, but many questions remain unanswered. In this article, we address recent claims that failure to recommend ENDS for smoking cessation represents unethical practice. We strongly dispute this claim, analysing the many complex issues that clinicians working in smoking cessation should consider.
Publisher: IEEE
Date: 2006
Publisher: Elsevier BV
Date: 2020
Publisher: Wiley
Date: 09-2002
DOI: 10.1002/SIA.1450
Publisher: Wiley
Date: 12-11-2019
DOI: 10.1111/AJCO.13278
Abstract: Multidisciplinary team (MDT) meetings can facilitate optimal lung cancer care, yet details of structured data collection and feedback remain sparse. This study aimed to investigate data collection and the impact of feedback to lung cancer MDTs. A mixed-methods study using pre and post-test surveys, semistructured interviews, and observation to evaluate data collection and response to modeled data feedback in three Australian lung cancer MDTs at different locations and development stage (site A: outer metropolitan, established site B, outer metropolitan, new and site C, inner metropolitan, established). MDT attendees (range 13-25) discussed 5-8 cases per meeting. All sites collected data prospectively (80% prepopulated) into local oncology medical information systems. The pretest survey had 17 respondents in total (88% clinicians). At sites A and C, 100% of respondents noted regular data audits, occasional at site B. Regular audit data included number of cases, stage, final diagnosis, and time to diagnosis and treatment. The post-test survey had 25 respondents in total, all clinicians. The majority (88-96%) of respondents found modeled data easy to interpret, relevant to clinical practice and the MDT, and welcomed future regular data presentations (as rated on a 5-point Likert scale mean weighted average 4.5 where > 4 demonstrates agreement). Semistructured interviews identified five major themes for MDTs: current practice, attitudes, enablers, barriers, and benefits for the MDT. MDT teams exhibited positive responses to modeled data feedback. Key characteristics of MDT data were identified and may assist with future team research and development.
Publisher: American Chemical Society (ACS)
Date: 14-10-2021
Publisher: American Chemical Society (ACS)
Date: 11-1990
DOI: 10.1021/AC00220A015
Publisher: Elsevier BV
Date: 06-2006
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA09208C
Abstract: The Fe center in FePc can be electrochemically substituted by Co and Ni, achieving high activity and stability for CO 2 reduction.
Publisher: Elsevier BV
Date: 02-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B503548A
Abstract: The adsorption of the neutral surfactant Brij35 at a liquid-liquid interface is reversibly monitored via its disturbance of an electrochemically imposed ion flux across the interface, forming a promising experimental tool for the detection of surface confined reactions at such liquids and polymers.
Publisher: Springer Science and Business Media LLC
Date: 1997
Publisher: Elsevier BV
Date: 04-2014
Publisher: American Chemical Society (ACS)
Date: 20-09-2018
Publisher: The Electrochemical Society
Date: 05-1999
DOI: 10.1149/1.1391837
Abstract: Corrosion rate data for mild steel corrosion inhibitors in carbonated brine media were fitted to the Temkin adsorption isotherm. The fundamental constants of the Temkin adsorption isotherm, i.e., molecular interaction and adsorption equilibrium constants, were used to glean important information about the behavior of adsorbed corrosion inhibitors. Adsorption data were also used to calculate Δ ad H , Δ ad G , and Δ ad S , and the results demonstrated that some compounds are chemisorbed onto the electrode. Significantly, it has been found that chemisorption of corrosion inhibitors can yield very good film persistency (i.e.. corrosion protection even when the inhibitor is no longer present). Molecular modeling using the quantum mechanical program PCSpartan plus , along with a comparative analysis of adsorption data for a broad range of inhibitor molecules, has been used to derive a tentative structure/activity relationship for some oil field corrosion inhibitors. © 1999 The Electrochemical Society. All rights reserved.
Publisher: Springer Science and Business Media LLC
Date: 2001
Publisher: Elsevier BV
Date: 06-1999
DOI: 10.1016/S0039-9140(99)00003-X
Abstract: It is shown that a chalcogenide glass mercury(II) ion-selective electrode (ISE) can be calibrated in chloride-free unbuffered and saline buffered standards, displaying near-Nernstian response over 19 orders of magnitude (i.e. 10(-20) to 10(-1) M Hg(2+)). Extended ageing of the ISE in seawater induced a memory effect, causing the electrode to respond in a sub-Nernstian fashion. Electrochemical impedance spectroscopy (EIS) demonstrated that the response of the Hg(II) ISE is underpinned by a charge transfer process, and seawater matrix effects are due to electrode passivation. It is shown that standard addition ISE potentiometry may compensate for interferences caused by the seawater matrix.
Publisher: Association for Materials Protection and Performance (AMPP)
Date: 12-2009
DOI: 10.5006/1.3319103
Publisher: Wiley
Date: 10-10-2017
Publisher: American Chemical Society (ACS)
Date: 15-03-0033
DOI: 10.1021/AC00030A006
Publisher: Elsevier BV
Date: 2011
Publisher: Wiley
Date: 10-2007
Abstract: This review will illustrate how it is possible to develop ion‐selective electrode (ISE) methodologies that meet the stringent requirements (i.e., high selectivities and very low detection limits) for the analysis of important analytes in the environment, and will present a variety of ex les on the application of ISEs in environmental analysis. Despite the experimental biases that have limited the analytical performance of ISEs through apparently high detection limits and modest selectivities, there has been a plethora of research in the application of ISEs in the monitoring of environmentally important trace metals and anions in natural waters and soils. Most popular has been the analysis of free metals in natural waters, as this parameter is known to be a master variable in the uptake and toxicology of trace metals on aquatic biota reflecting the bioavailability of trace metals in the environment. Furthermore, as copper is a major trace metal in coastal waters due to its extensive use in antifouling paints on sea vessels and structures, there are many reports in the literature on the use of the copper ISE in assays of either free copper or the copper complexing capacity of natural waters and soil peats. Moreover, there have been a variety of studies showing a strong correlation between free copper levels and the toxicity of copper on a variety of marine and fresh water organisms. Nevertheless, there are numerous reports in the literature that have used ISEs to monitor important anions such as fluoride, phosphate, sulfate, nitrate, nitrite, chloride, cyanide, etc., as well as other important cations such as ammonium and chromium(VI) in waste and natural waters. In conclusion, this review will present new and interesting perspectives on the application of ISEs in environmental analysis using approaches such as real‐time remote monitoring of water quality, shipboard monitoring of environmentally important analytes using flow analysis instrumentation, the use of robust all‐solid‐state ISEs in submersible instruments for long‐term deployment in the field, and innovative analytical approaches such as backside calibration and switchtrodes that avoid standard addition analysis and the concomitant perturbation in analyte speciation in natural s les.
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1AN15267J
Abstract: Solid-contact (SC) ion-selective electrodes (ISEs) utilizing thin films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and plasticized poly(vinylchloride) (PVC) have been produced using a spin casting procedure. This study was carried out with a view of characterizing this popular and well known SC ISE using a series of complementary surface analysis techniques. This work revealed that PEDOT:PSS prevents the separation of an undesirable water layer at the buried interface of this SC ISE due to the high miscibility of water in the hydrophilic PEDOT:PSS layer. The lack of a clearly defined and molecularly sharp buried interface prohibits the formation of a distinct water layer presumably by eliminating sites that promote the accumulation of water. This outcome is important to the chemical sensor community since it provides further insights into the compatibility of sensor components in SC ISEs.
Publisher: Elsevier BV
Date: 09-2004
Publisher: Wiley
Date: 13-03-2019
Publisher: Elsevier BV
Date: 08-2006
Publisher: Wiley
Date: 1999
DOI: 10.1002/(SICI)1098-2728(1999)11:5<284::AID-LRA7>3.0.CO;2-8
Publisher: Elsevier BV
Date: 08-2000
Publisher: Wiley
Date: 30-03-2023
Abstract: As a widely used commodity chemical, ammonia is critical for producing nitrogen‐containing fertilizers and serving as the promising zero‐carbon energy carrier. Photoelectrochemical nitrogen reduction reaction (PEC NRR) can provide a solar‐powered green and sustainable route for synthesis of ammonia (NH 3 ). Herein, an optimum PEC system is reported with an Si‐based hierarchically‐structured PdCu/TiO 2 /Si photocathode and well‐thought‐out trifluoroethanol as the proton source for lithium‐mediated PEC NRR, achieving a record high NH 3 yield of 43.09 µg cm −2 h −1 and an excellent faradaic efficiency of 46.15% under 0.12 MPa O 2 and 3.88 MPa N 2 at 0.07 V versus lithium(0/+) redox couple (vs Li 0/+ ). PEC measurements coupled with operando characterization reveal that the PdCu/TiO 2 /Si photocathode under N 2 pressures facilitate the reduction of N 2 to form lithium nitride (Li 3 N), which reacts with active protons to produce NH 3 while releasing the Li + to reinitiate the cycle of the PEC NRR. The Li‐mediated PEC NRR process is further enhanced by introducing small amount of O 2 or CO 2 under pressure by accelerating the decomposition of Li 3 N. For the first time, this work provides mechanistic understanding of the lithium‐mediated PEC NRR process and opens new avenues for efficient solar‐powered green conversion of N 2 ‐to‐NH 3 .
Publisher: American Chemical Society (ACS)
Date: 15-06-2019
Publisher: American Chemical Society (ACS)
Date: 17-06-2016
DOI: 10.1021/ACS.ANALCHEM.6B01800
Abstract: We report on the limiting conditions for ion-transfer voltammetry between an ion-exchanger doped and plasticized poly(vinyl chloride) (PVC) membrane and an electrolyte solution that was triggered via the oxidation of a poly(3-octylthiophene) (POT) solid-contact (SC), which was unexpectedly related to the thickness of the POT SC. An electropolymerized 60 nm thick film of POT coated with a plasticized PVC membrane exhibited a significant sodium transfer voltammetric signal whereas a thicker film (180 nm) did not display a measurable level of ion transfer due to a lack of oxidation of thick POT beneath the membrane film. In contrast, this peculiar phenomenon was not observed when the POT film was in direct contact with an organic solvent-based electrolyte. This evidence is indicative of three key points: (i) the coated membrane imposes a degree of rigidity to the system, which restricts the swelling of the POT film and its concomitant p-doping (ii) this phenomenon is exacerbated with thicker POT films due to an initial morphology (rougher comprising a network of large POT nanoparticles), which gives rise to a diminished surface area and electrochemical reactivity in the POT SC (iii) the rate of sodium transfer is higher with a thin POT film due to a smoother surface morphology made up of a network of smaller POT nanoparticles with an increased surface area and electrochemical reactivity. A variety of techniques including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), ellipsometry, scanning electron microscopy (SEM), atomic force microscopy (AFM), and synchrotron radiation-X-ray photoelectron spectroscopy (SR-XPS) were used to elucidate the mechanism of the POT thickness/POT surface roughness dependency on the electrochemical reactivity of the PVC/POT SC system.
Publisher: The Electrochemical Society of Japan
Date: 2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B714248J
Publisher: Elsevier BV
Date: 09-2012
DOI: 10.1016/J.ACA.2012.07.026
Abstract: A nitrate ion-selective electrode (ISE) employing a permeable tubular membrane impregnated with a conventional ISE cocktail has been used successfully in the coulometric analysis of nitrate in fresh waters. The liquid ISE membrane comprising a nitrate ionophore [tridodecylmethylammonium nitrate (TDMAN)], lipophilic electrolyte [tetradodecyl-ammoniumtetrakis(4-chlorophenyl)borate (ETH 500)] and plasticizer [bis(3-ethyl-hexyl)sebacate (DOS)] was supported on a porous polypropylene tube. Coulometric analysis with the tubular membrane ISE showed that nitrate could be detected in the range 10-100 μM with a precision of 2.3% relative standard deviation (RSD), limit of detection of 1.1 μM and relative accuracy of 4.4% compared to a certified reference material (CRM) Lake s le.
Publisher: Elsevier BV
Date: 07-2010
Publisher: Elsevier
Date: 2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B212914K
Abstract: X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), rotating disc electrode-electrochemical impedance spectroscopy (RDE-EIS) and synchrotron radiation-grazing incidence X-ray diffraction (SR-GIXRD) have been used to study the response mechanism of the mercury(II) chalcogenide ion-selective electrode (ISE) in saline media. XPS and SIMS have shown that the chalcogenide surface is poisoned by silver chloride, or a mixture of silver halides, on continuous exposure to synthetic and real seawater. Significantly, the in-situ SR-GIXRD study demonstrated that electrode fouling in synthetic seawater is linked to the formation of poorly crystalline or amorphous silver chloride, and that the low level of free mercury(II) in a calibration buffer (i.e., 10(-14) M) is able to undergo metathesis with silver(II) sulfide in the membrane generating mercury(II) sulfide. Significantly, the results of this detailed surface study have shown that silver chloride fouling of the electrode is ameliorated in real seawater comprising natural organic ligands, and this has been attributed to the peptization of silver chloride by the surfactant-like nature of seawater ligands at pH 8. RDE-EIS aging studies have revealed that the chalcogenide membrane experiences a sluggish charge transfer reaction in seawater, and contrary to a previous report for a static electrode, the seawater matrix does not passivate the RDE. The results of this XPS, SIMS, RDE-EIS and SR-GIXRD study have elucidated the response mechanism of the mercury(II) ISE in saline media.
Publisher: Wiley
Date: 07-2006
Abstract: In modern materials science, there is a plethora of characterization techniques of materials that can provide valuable insights into the fundamental chemical physics of solid‐state devices such as chalcogenide glass ion‐selective electrodes (ISEs). In this paper, electrochemical impedance spectroscopy (EIS), X‐ray photoelectron spectrometry (XPS) and secondary ion mass spectrometry (SIMS) have been used in the elucidation of the mechanistic chemistry of the cadmium chalcogenide glass ISE. Furthermore, in situ synchrotron radiation‐grazing incidence X‐ray diffraction (SR‐GIXRD), in situ EIS/SR‐GIXRD, along with small angle neutron scattering (SANS), can be used to unravel the complex relationship between the nanostructure, bulk electrical conductivity and concomitant electrochemical reactivity of an iron chalcogenide glass ISE. Significantly, exciting preliminary modified atomic force microscopy (AFM) data – utilizing AFM cantilevers with attached microparticles of the copper sensing material jalpaite – demonstrate the tremendous potential of selective force ISE‐AFM in the imaging of important molecular structures such as the copper ion channels of cell membranes in fish gills and/or phytoplankton.
Publisher: Elsevier BV
Date: 2009
Publisher: Informa UK Limited
Date: 02-04-2016
Publisher: Springer Science and Business Media LLC
Date: 2000
Publisher: Wiley
Date: 08-11-2019
Abstract: Water‐splitting photoanodes based on semiconductor materials typically require a dopant in the structure and co‐catalysts on the surface to overcome the problems of charge recombination and high catalytic barrier. Unlike these conventional strategies, a simple treatment is reported that involves soaking a s le of pristine BiVO 4 in a borate buffer solution. This modifies the catalytic local environment of BiVO 4 by the introduction of a borate moiety at the molecular level. The self‐anchored borate plays the role of a passivator in reducing the surface charge recombination as well as that of a ligand in modifying the catalytic site to facilitate faster water oxidation. The modified BiVO 4 photoanode, without typical doping or catalyst modification, achieved a photocurrent density of 3.5 mA cm −2 at 1.23 V and a cathodically shifted onset potential of 250 mV. This work provides an extremely simple method to improve the intrinsic photoelectrochemical performance of BiVO 4 photoanodes.
Publisher: Elsevier BV
Date: 02-1994
Publisher: Elsevier BV
Date: 08-2014
DOI: 10.1016/J.ACA.2014.08.046
Abstract: Three new calixarene Tl(+) ionophores have been utilized in Tl(+) ion-selective electrodes (ISEs) yielding Nernstian response in the concentration range of 10(-2)-10(-6)M TlNO3 with a non-optimized filling solution in a conventional liquid contact ISE configuration. The complex formation constants (logβIL) for two of the calixarene derivatives with thallium(I) (i.e. 6.44 and 5.85) were measured using the sandwich membrane technique, with the other ionophore immeasurable due to eventual precipitation of the ionophore during these long-term experiments. Furthermore, the unbiased selectivity coefficients for these ionophores displayed excellent selectivity against Zn(2+), Ca(2+), Ba(2+), Cu(2+), Cd(2+) and Al(3+) with moderate selectivity against Pb(2+), Li(+), Na(+), H(+), K(+), NH4(+) and Cs(+), noting that silver was the only significant interferent with these calixarene-based ionophores. When optimizing the filling solution in a liquid contact ISE, it was possible to achieve a lower limit of detection of approximately 8nM according to the IUPAC definition. Last, the new ionophores were also evaluated in four solid-contact (SC) designs leading to Nernstian response, with the best response noted with a SC electrode utilizing a gold substrate, a poly(3-octylthiophene) (POT) ion-to-electron transducer and a poly(methyl methacrylate)-poly(decyl methacrylate) (PMMA-PDMA) co-polymer membrane. This electrode exhibited a slope of 58.4mVdecade(-1) and a lower detection limit of 30.2nM. Due to the presence of an undesirable water layer and/or leaching of redox mediator from the graphite redox buffered SC, a coated wire electrode on gold and graphite redox buffered SC yielded grossly inferior detection limits against the polypyrrole/PVC SC and POT/PMMA-PDMA SC ISEs that did not display signs of a water layer or leaching of SC ingredients into the membrane.
Publisher: The Electrochemical Society of Japan
Date: 2017
Publisher: Wiley
Date: 03-1997
Publisher: American Chemical Society (ACS)
Date: 08-2008
DOI: 10.1021/AC800823F
Publisher: American Chemical Society (ACS)
Date: 15-10-2009
DOI: 10.1021/EF901013A
Publisher: Elsevier BV
Date: 03-1995
Publisher: Elsevier BV
Date: 1986
Publisher: Elsevier BV
Date: 08-2006
Publisher: Wiley
Date: 09-2002
DOI: 10.1002/SIA.1449
Publisher: Elsevier BV
Date: 1987
Publisher: Elsevier BV
Date: 03-2020
Publisher: American Chemical Society (ACS)
Date: 27-02-2017
DOI: 10.1021/ACS.ANALCHEM.6B04625
Abstract: To understand the rate determining processes during the equilibration of poly(3,4-ethylenedioxythiophene):polystyrenesulfonate-based (PEDOT(PSS)-based) solid contact (SC) ion-selective electrodes (ISEs), the surfaces of Pt, Au, and GC electrodes were coated with 0.1, 1.0, 2.0, and 4.0 μm thick galvanostatically deposited PEDOT(PSS) films. Next, potential vs time transients were recorded with these electrodes, with and without an additional potassium ion-selective membrane (ISM) coating, following their first contact with 0.1 M KCl solutions. The transients were significantly different when the multilayered sensor structures were assembled on Au or GC compared to Pt. The differences in the rate of equilibration were interpreted as a consequence of differences in the hydrophilicity of PEDOT(PSS) in contact with the substrate electrode surfaces based on X-ray photoelectron spectroscopy (XPS) and synchrotron radiation-XPS (SR-XPS) analysis of 10-100 nm thick PEDOT(PSS) films. The influence of the layer thickness of the electrochemically deposited PEDOT(PSS)-films on the hydrophilicity of these films has been documented by contact angle measurements over PEDOT(PSS)-coated Au, GC, and Pt electrode surfaces. This study demonstrates that it is possible to minimize the equilibration (conditioning) time of SC ISEs with aqueous solutions before usage by optimizing the thickness of the SC layer with a controlled ISM thickness. PEDOT(PSS)-coated Au and GC electrodes exhibit a significant negative potential drift during their equilibration in an aqueous solution. By coating the PEDOT(PSS) surface with an ISM, the negative potential drift is compensated by a positive potential drift related to the hydration of the ISM and activity changes at the PEDOT(PSS)|ISM interface. The potential drifts related to activity changes in the ISM have been determined by a novel adaptation of the "sandwich membrane" method.
Publisher: American Chemical Society (ACS)
Date: 07-09-2017
Abstract: As differentiated from conventional synthetic processes, amino-functionalized hollow mesoporous silica (NH
Publisher: Wiley
Date: 10-2021
DOI: 10.1111/RESP.14155
Publisher: Wiley
Date: 04-11-2019
Abstract: The (photo)electrochemical N
Publisher: Wiley
Date: 26-07-2020
DOI: 10.1111/RESP.13904
Publisher: Elsevier BV
Date: 03-2007
Publisher: Wiley
Date: 2003
DOI: 10.1002/SIA.1567
Publisher: Elsevier BV
Date: 10-05-2004
DOI: 10.1016/J.TALANTA.2003.11.025
Abstract: This paper presents a preliminary structural and interfacial study of the iron chalcogenide glass [i.e., Fe(x)(Ge(28)Sb(12)Se(60))(100-x)] ion-selective electrode (ISE) using small angle neutron scattering (SANS) and electrochemical impedance spectroscopy (EIS). SANS detected variations in the neutron scattering as a function of iron content in the chalcogenide glass. Furthermore, a change in the chalcogenide glass structure was observed at elevated iron dopant levels. Conversely, EIS was used to show that the iron chalcogenide membrane comprises various time constants, and the interfacial charge transfer reaction depends on the membrane iron content. Equivalent circuit modeling revealed that the charge transfer resistance decreases at elevated iron levels, and this may be related to the presence of iron defects in the glass. It is proposed that the iron chalcogenide membrane comprises an iron nanostructural network embedded in the amorphous matrix, and this directly influences the electrical conductivity and concomitant electrochemical reactivity of the glass.
Publisher: American Chemical Society (ACS)
Date: 06-09-2008
DOI: 10.1021/EF8004306
Publisher: Wiley
Date: 30-07-2022
DOI: 10.1002/RCR2.1010
Abstract: Disseminated primary varicella infection can carry risks of significant morbidity and mortality particularly in immunocompromised populations. Routine, funded childhood vaccination against varicella has significantly reduced associated hospitalization and deaths, however, uptake and efficacy among adults is unknown. We present a case of disseminated primary varicella infection (including rash, pneumonitis, hepatitis and thrombocytopenia) in an immunocompetent patient on long term inhaled corticosteroids for asthma. This case highlights potential risk factors for severe varicella which require further study in adults and raises the need to discuss vaccination in at risk groups including appropriate counselling in those who may be at higher risk.
Publisher: Elsevier BV
Date: 06-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 1999
DOI: 10.1039/A903819A
Abstract: This work describes the development of an instrument for measuring free and total copper in seawater by continuous flow analysis (CFA) with an Orion copper (II) ion selective electrode (CuISE). S le analysis times are reduced considerably by using an extrapolation technique based on the fitting of an empirical mathematical expression to the electrode time-response curve enabling a prediction of the final equilibrium potential. CuISE measurements in seawater s les containing nanomolar levels of total copper can be very time consuming, and this predictive approach significantly reduces s le analysis time, and improves s le throughput. The time taken to measure pCu in seawater to a precision of +/- 0.1, using conventional potentiometry, varies considerably depending on the condition of the electrode membrane but can be reduced by a factor of 3-6 (typically from 60 to 10 min) by using the extrapolation technique in conjunction with CFA. Details are given of the protocols used for preconditioning the CuISE. The system can be used as a portable instrument for field measurements or for shipboard measurements of free copper in seawater. Extrapolated equilibrium potentials are within +/- 0.5 mV of true steady state values.
Publisher: Elsevier BV
Date: 06-2017
Start Date: 01-2012
End Date: 12-2013
Amount: $480,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 12-2013
Amount: $800,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2018
End Date: 12-2021
Amount: $564,124.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2007
End Date: 06-2010
Amount: $36,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 12-2017
Amount: $375,500.00
Funder: Australian Research Council
View Funded ActivityStart Date: 11-2004
End Date: 12-2007
Amount: $120,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 06-2015
Amount: $320,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2003
End Date: 08-2005
Amount: $160,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 04-2015
Amount: $890,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2011
End Date: 12-2011
Amount: $180,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2012
End Date: 06-2015
Amount: $420,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2004
End Date: 12-2004
Amount: $10,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2018
End Date: 12-2019
Amount: $3,189,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2006
End Date: 06-2009
Amount: $210,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2008
End Date: 12-2009
Amount: $220,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2011
End Date: 12-2012
Amount: $800,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 12-2010
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2017
End Date: 05-2018
Amount: $470,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 04-2010
Amount: $180,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2004
End Date: 12-2006
Amount: $27,200.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2019
End Date: 03-2020
Amount: $844,947.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2021
End Date: 12-2023
Amount: $950,000.00
Funder: Australian Research Council
View Funded Activity