ORCID Profile
0000-0003-1662-0709
Current Organisation
Nanyang Technological University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: American Chemical Society (ACS)
Date: 20-03-2017
DOI: 10.1021/ACS.ANALCHEM.6B04179
Abstract: This work uncovers the application of porphyrin dimers for the use in electroanalysis, such as potentiometric determination of ions. It also puts in question a current perception of an occurrence of the super-Nernstian response, as a result of the possible dimerization of single porphyrins within an ion-selective membrane. To study that, four various porphyrin dimers were used as ionophores, namely, freebase-freebase, Zn-Zn, Zn-freebase, and freebase-Zn. Since the Zn-freebase and freebase-Zn porphyrin dimers carried both anion- and cation-sensitive porphyrin units, their application in ISEs was utilized in both anion- and cation-sensitive sensors. With respect to the lipophilic salt added, both porphyrins dimers were found anion- and cation-sensitive. This allowed using a single molecule as novel type of versatile ionophore (anion- and cation-selective), simply by varying the membrane composition. All anion-sensitive sensors were perchlorate-sensitive, while the cation-selective sensors were silver-sensitive. The selectivity of the sensors depended primarily on the porphyrin dimers in the ion-selective membrane. Furthermore, the selectivity of cation-sensitive dimer based sensors was found significantly superior to the ones measured for the single porphyrin unit based sensors (precursors of the porphyrin dimers). Thus, the dimerization of single porphyrins may actually be a factor to increase or modulate porphyrin selectivity. Moreover, in the case of cation-sensitive sensors, the selectivity vastly depended on the order of porphyrin units in the dimer. This opens a new approach of regulating and adjusting sensitivity and selectivity of the sensor through the application of complex porphyrin systems with more than one porphyrin units with mix sensitive porphyrins.
Publisher: Elsevier BV
Date: 06-2023
Publisher: American Chemical Society (ACS)
Date: 14-12-2022
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.ACA.2011.09.026
Abstract: Lowering of the detection limit of solid-state lead-selective electrodes was achieved by using the tuned galvanostatic polarization method. A Nernstian response was obtained down to nanomolar concentrations (low detection limit 10(-9) mol dm(-3)Pb(2+)). Good repeatability of the calibration curves was achieved by using a well established measuring procedure. Relatively high cathodic current densities were applied to the solid-state membrane in order to shorten the measurement time. Successful determination of lead in a synthetic s le (pPb(2+)=7.97±0.08) was achieved by introducing an analytical protocol and favourably compared to inductively coupled plasma mass spectrometry (pPb=7.93). By applying this method, a significant improvement in the detection limit of solid-state lead-selective electrodes was attained.
Publisher: Elsevier BV
Date: 09-2014
Publisher: Wiley
Date: 27-10-2010
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 05-2023
Publisher: Wiley
Date: 27-08-2013
Publisher: Elsevier BV
Date: 08-2013
DOI: 10.1016/J.ACA.2013.04.044
Abstract: In potentiometry, high selectivity of the ion-selective membranes must be assured in order to reliably measure various analytes in clinical, industrial and environmental s les. Due to the toxic nature of lead(II) it is important to monitor Pb(2+) distribution in natural waters. This may be achieved by implementation of ion-selective electrodes (ISEs) with high selectivity towards lead(II) and low detection limit. A great number of Pb(2+)-ionophores were synthesized and studied. In this work lead(II)-selective ionophores, starting from late 90s, are gathered and discussed. This work gives a comprehensive description and discussion on the novel and available lead(II)-selective ionophores for ISEs.
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 12-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR02773A
Abstract: A highly active and cost-effective ORR catalyst was made from metal–organic frameworks and shows an excellent ORR performance, comparable to that of commercial Pt/C.
Publisher: Wiley
Date: 05-12-2013
Publisher: Wiley
Date: 28-12-2012
Publisher: Elsevier BV
Date: 06-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2AN01108E
Abstract: Paper-based microfluidic solution s ling is a viable option for potentiometric sensors to be used for the determination of analytes in s les with high solid-to-liquid ratios. Unfortunately, heavy metal sensitive electrodes cannot be easily integrated with paper-based solution s ling as heavy metals have strong physicochemical adsorption affinity towards paper substrates. In this work, paper substrates were modified with an ion-selective membrane (ISM) cocktail (used for the preparation of Pb
Publisher: Elsevier BV
Date: 10-0002
Publisher: Elsevier BV
Date: 11-2021
Publisher: American Chemical Society (ACS)
Date: 29-09-2021
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 05-04-2012
Publisher: Wiley
Date: 09-2020
Publisher: Elsevier BV
Date: 05-2023
Publisher: American Chemical Society (ACS)
Date: 10-01-2013
DOI: 10.1021/AC302772V
Abstract: Thioamide derivatives of p-tert-butylcalix[4]arene were used as ionophores in the development of solid-contact ion-selective electrodes based on conducting polymer poly(3,4-ethylenedioxythiophene) olystyrene sulfonate (PEDOT/PSS) which was synthesized by electrodeposition on the glassy carbon electrodes. The typical ion-selective membranes with optionally two different plasticizers [bis(2-ethylhexyl)sebacate (DOS) and 2-nitrophenyl octyl ether (NPOE)] were investigated. The potentiometric selectivity coefficients were determined by separate solution method (SSM) for Pb(2+) over Cu(2+), Cd(2+), Ca(2+), Na(+), and K(+). High selectivity toward Pb(2+) was obtained. By applying two conditioning protocols, a low detection limit log(a(DL)) ≈ -9 was achieved. The fabricated ion-selective electrodes were used to determine Pb(2+) concentration in environmental s les. The obtained results were compared to analysis done by inductively coupled plasma mass spectrometry (ICPMS).
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CC09052H
Abstract: Ex situ and in situ 3-D and electrically conducting mapping of the skin topography via electropolymerization of a conducting polymer on a previously s led skin st or directly on the skin of a live human subject were performed here with the intention to be further used in biomedical applications.
Publisher: Wiley
Date: 03-06-2021
DOI: 10.1002/JCTB.6805
Abstract: The red mud (bauxite residue) is a rare earth element (REE) bearing material that should be considered a valuable resource. This research investigated the selective leaching of scandium (Sc) and yttrium (Y) from red mud by agitation leaching, as well as thermal and hydrothermal processing. Material characterization was conducted to shed light on the leaching mechanism for high REE extraction selectivity. The agitation leaching with HCl, HNO 3 , and H 2 SO 4 was insufficient for high leaching efficiencies of REEs. The addition of Ethylenediaminetetraacetic acid (EDTA) had a minor influence in the leaching of elements. Two acid combinations (0.27 Μ HCl + 0.2 Μ H 2 SO 4 and 0.27 Μ HCl + 0.2 Μ HNO 3 ) were formulated to optimize the leaching efficiency of REEs under thermal and hydrothermal processing. Thermal processing showed high Y leaching, but the selectivity was low because of considerable Ti and Fe extraction. High REE leaching selectivity was achieved when HCl + HNO 3 was used in hydrothermal processing at 180 °C. Material characterization indicated that dense aggregation of particles occurred after hydrothermal processing. The mineral geothite was dissolved and new crystals like potassium calcium silicate were formed. The high selective leaching of Sc and Y during hydrothermal processing was controlled by the extraction and desorption of elements from the material surface. The precipitation of Fe, Ca, and Ti and their re‐crystallization in new minerals have enhanced leaching selectivity. © 2021 Society of Chemical Industry (SCI).
Publisher: Elsevier BV
Date: 15-12-2010
DOI: 10.1016/J.TALANTA.2010.09.043
Abstract: The detection limit of a Pb(2+) ion-selective electrode with a solid state (PbS/Ag(2)S) membrane was successfully lowered to the nanomolar range. The electrode was applied in direct potentiometric determination of Pb(2+) in aqueous solutions. Hydrodynamics, redox reaction at the solid-state surface as well as time dependency were investigated and found as key factors affecting the low detection limit. By optimizing these parameters improving detection limit by ca. three orders of magnitude was achieved.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3AN02157B
Abstract: This communication presents a new approach to potentiometric sensing utilizing paper-based microfluidic s ling and solid-contact electrodes.
Publisher: Springer Science and Business Media LLC
Date: 28-08-2008
Publisher: Wiley
Date: 05-05-2023
Abstract: Utilization of renewable raw materials as feedstock defossilizes industrial manufacturing while subsequent carbon capture reduces carbon footprint. We applied this concept to design a new pyrolysis‐based process for synthesis of biogenic multi‐walled carbon nanotubes (MWCNTs) and H 2 from biomass. It was demonstrated that the conversion of hydrocarbon compounds in pyrolysis gas into MWCNTs and H 2 is detrimentally influenced by accompanied CO 2 released from biomass decomposition. Capturing CO 2 with a calcium sorbent upgraded the pyrolysis gas into a suitable gaseous precursor for downstream production of MWCNTs and H 2 ‐rich gas. Furthermore, the results suggest that CO 2 capture with the sorbent has a potential to outperform a liquid alkaline scrubber owing to avoided liquid organic waste generation, sorbent regenerability and higher H 2 recovery from biomass pyrolysis gas.
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 08-2022
DOI: 10.1016/J.ENVPOL.2022.119524
Abstract: Current synthesis routes of bismuth oxide nanosheets (BiONS) are relatively complicated, requiring the use of halogens or metalloids. Herein, a facile method to synthesize BiONS without the addition of halogens or other metalloids was developed. The synthesized BiONS were identified to have flake-shaped structures (300-1000 nm in width) with the thickness of 6-10 nm, which were predominantly made of β-Bi
Publisher: Elsevier BV
Date: 03-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA05333B
Abstract: We present a simple and effective way of using metal and metal–ligand modifications to tune the electrochemical and optical properties of conducting polymers.
Publisher: American Chemical Society (ACS)
Date: 05-05-2023
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 07-2023
Publisher: American Chemical Society (ACS)
Date: 12-01-2021
Publisher: American Chemical Society (ACS)
Date: 23-07-2019
DOI: 10.1021/ACS.ANALCHEM.9B01490
Abstract: An outer layer of pure silicone rubber (SR), i.e. SR without any plasticizer, ionophore, or lipophilic anion, was applied on top of a conventional poly(vinyl chloride) (PVC) based K
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1SE01443A
Abstract: Selective conversion of hydroxymethylfurfural to diformylfuran using copper hydroxide nitrate.
Publisher: Elsevier BV
Date: 03-2022
DOI: 10.1016/J.ACA.2022.339495
Abstract: Metal modified paper-based substrates were utilized for microfluidic paper-based solution s ling coupled with Pb
No related grants have been discovered for Grzegorz Lisak.