ORCID Profile
0000-0002-5874-3937
Current Organisation
La Trobe University
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Materials Engineering Not Elsewhere Classified | Colloid And Surface Chemistry | Physical Chemistry (Incl. Structural) | Condensed Matter Physics—Other | Other Physical Sciences | Biomaterials | Optical Physics Not Elsewhere Classified | Instruments And Techniques
Fabricated metal products not elsewhere classified | Ceramics, glass and industrial mineral products not elsewhere classified | Other | Plastic products (incl. Construction materials) | Other |
Publisher: American Chemical Society (ACS)
Date: 09-06-2014
DOI: 10.1021/JP502078T
Publisher: Elsevier BV
Date: 09-2005
Publisher: IOP Publishing
Date: 03-2006
DOI: 10.1088/1748-6041/1/1/004
Abstract: The adsorption and covalent immobilization of human immunoglobulin (HIgG) and lysozyme (LYZ) on surface-modified poly(tert-butyl methacrylate) PtBMA films have been evaluated using x-ray photoelectron spectroscopy (XPS), ellipsometry and atomic force microscopy (AFM). Surface modification of PtBMA (UV irradiation) afforded surfaces suitable for both the physical and covalent attachment of proteins. The XPS and ellipsometry results showed good correlation in terms of variable-dense/thickness protein layer formation between physisorbed and covalently bound proteins. The amount of physisorbed HIgG ranged from 23.0 +/- 1.6 ng mm(2) on PtBMA, with corresponding film thicknesses 17.0 +/- 1.2 nm. Covalent immobilization mediated through 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC)/N-hydroxysulfosuccinimide (sulfo-NHS) coupling chemistry, afforded 5.6-8 ng mm(2) of HIgG with a corresponding thickness of 5.9 +/- 0.6 nm on PtBMA. The attachment of LYZ to modified PtBMA surface was similarly translated, where adsorption yielded up to 15 ng mm(2), while covalent immobilization afforded typically 7-8 ng mm(2). The thickness of the adsorbed LYZ protein layer was 11.0 +/- 3.2 nm (PtBMA), suggesting the greater portion of protein adsorbs on surface-modified PtBMA.
Publisher: Wiley
Date: 29-03-2006
DOI: 10.1002/SIA.2222
Publisher: SAGE Publications
Date: 15-07-2010
Abstract: A wool fabric has been subjected to an atmospheric-pressure treatment with a helium plasma for 30 seconds. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry confirmed removal of the covalently-bound fatty acid layer (F-layer) from the surface of the wool fibers, resulting in exposure of the underlying, hydrophilic protein material. Dye uptake experiments were carried out at 50°C to evaluate the effects of plasma on the rate of dye uptake by the fiber surface, as well as give an indication of the adsorption characteristics in the early stages of a typical dyeing cycle. The dyes used were typical, sulfonated wool dyes with a range of hydrophobic characteristics, as determined by their partitioning behavior between water and n-butanol. No significant effects of plasma on the rate of dye adsorption were observed with relatively hydrophobic dyes. In contrast, the relatively hydrophilic dyes were adsorbed more rapidly (and uniformly) by the plasma-treated fabric. It was concluded that adsorption of hydrophobic dyes on plasma-treated wool was influenced by hydrophobic interactions, whereas electrostatic effects predominated for dyes of more hydrophilic character. On heating the dyebath to 90°C in order to achieve fiber penetration, no significant effect of the plasma treatment on the extent of uptake or levelness of a relatively hydrophilic dye was observed as equilibrium conditions were approached.
Publisher: Elsevier BV
Date: 06-2015
Publisher: American Chemical Society (ACS)
Date: 12-03-2020
Publisher: Elsevier BV
Date: 06-2004
Publisher: Elsevier BV
Date: 10-2006
Publisher: Elsevier BV
Date: 05-2004
Publisher: Elsevier BV
Date: 2004
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 02-2008
Publisher: IOP Publishing
Date: 22-10-2021
Abstract: Graphitic nanoplatelets (GNPs) have been treated using an ultrasonicated ozonolysis procedure to produce stable aqueous dispersions that facilitate deposition of thin films using electrophoretic deposition. The thin GNP films were then coated with zero valence (ZV) iron nanocubes using a pulsed electrodeposition technique. Characterization of the ZV-iron coating with deposition time revealed that the changing magnetic character of the ferromagnetic-graphitic hybrid material was related to the nucleation density and growth of the ZV-iron nanocubes. Density functional theory calculations show a preference for ZV-iron adsorption at the oxygen sites of the GNPs, with ZV-iron displacement of oxygen groups favored in some configurations. Transmission electron microscopy studies confirm ZV-iron growth nucleates preferentially at the graphite nanoplatelet edges and the hybrid material magnetism is affected by the convergent crystalline grain boundaries formed between adjacent ZV-iron nanocubes.
Publisher: Elsevier BV
Date: 2006
Publisher: American Chemical Society (ACS)
Date: 23-02-2009
DOI: 10.1021/JP8092868
Publisher: MyJove Corporation
Date: 30-05-2017
DOI: 10.3791/55614
Publisher: Trans Tech Publications, Ltd.
Date: 09-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.802.262
Abstract: This paper describes metallization of PET surface by Sn-free electroless deposition (ELD) of thin copper layer. Prior to introduction to ELD process, the PET surface was plasma-pretreated in argon atmosphere. ELD is a multi-step process involving silanization with TMS, activation with PdCl 2 and copper deposition. Contact angle measurement and XPS analysis were carried out at each stage in order to confirm the chemical change of the PET surface after modification. XPS analysis revealed that the copper surface consisted mainly of Cu 2 O, combined with Cu 0 , making Cu-coated PET sheet suitable for the use as substrate for electropolymerization of pyrrole. This study offers an alternative to preparing flexible sensors. This process could be further applied to micro-contact printing technique to fabricate flexible patterned electrodes.
Publisher: Elsevier BV
Date: 11-2016
DOI: 10.1016/J.BIOMATERIALS.2016.08.011
Abstract: The development of electrospun ultrafine fibres from biodegradable and biocompatible polymers has created exciting opportunities for biomedical applications. Fibre meshes with high surface area, suitable porosity and stiffness have been produced. Despite desirable structural and topographical properties, for most synthetic and some naturally occurring materials, the nature of the fibre surface chemistry has inhibited development. Hydrophobicity, undesirable non-specific protein adsorption and bacterial attachment and growth, coupled with a lack of surface functionality in many cases and an incomplete understanding of the myriad of interactions between cells and extracellular matrix (ECM) proteins have impeded the application of these systems. Chemical and physical treatments have been applied in order to modify or control the surface properties of electrospun fibres, with some success. Chemical modification using controlled radical polymerization, referred to here as reversible-deactivation radical polymerization (RDRP), has successfully introduced advanced surface functionality in some fibre systems. Atom transfer radical polymerization (ATRP) and reversible addition fragmentation chain transfer (RAFT) are the most widely investigated techniques. This review analyses the practical applications of electrospinning for the fabrication of high quality ultrafine fibres and evaluates the techniques available for the surface modification of electrospun ultrafine fibres and includes a detailed focus on RDRP approaches.
Publisher: Wiley
Date: 2002
DOI: 10.1002/SIA.1471
Publisher: The Electrochemical Society
Date: 2006
DOI: 10.1149/1.2217260
Publisher: Elsevier BV
Date: 2014
Publisher: American Chemical Society (ACS)
Date: 19-08-2016
DOI: 10.1021/ACS.LANGMUIR.6B02312
Abstract: Artificial neural networks (ANNs) form a class of powerful multivariate analysis techniques, yet their routine use in the surface analysis community is limited. Principal component analysis (PCA) is more commonly employed to reduce the dimensionality of large data sets and highlight key characteristics. Herein, we discuss the strengths and weaknesses of PCA and ANNs as methods for investigation and interpretation of a complex multivariate s le set. Using time-of-flight secondary ion mass spectrometry (ToF-SIMS) we acquired spectra from an antibody and its proteolysis fragments with three primary-ion sources to obtain a panel of 72 spectra and a characteristic peak list of 775 fragment ions. We describe the use of ANNs as a means to interpret the ToF-SIMS spectral data, highlight the optimal neural network design and computational parameters, and discuss the technique limitations. Further, employing Bi3(+) as the primary-ion source, ANNs can accurately classify antibody fragments from the parent antibody based on ToF-SIMS spectra.
Publisher: American Chemical Society (ACS)
Date: 30-11-2010
DOI: 10.1021/LA104117H
Abstract: The electrodeposition of the electrochemiluminescent (ECL) ruthenium complex, bis(2,2'-bipyridyl)(4'-(4-aminophenyl)-2,2'-bipyridyl)ruthenium(II), [Ru(bpy)(2)(apb)](2+), via the in situ formation of a diazonium species from aqueous media is reported. Surface characterization undertaken using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) determined that the layer is bound to the substrate via azo bonding. The layer displays good ECL activity and is stable over a long period of time. The excellent potential of this system for ECL sensing applications is demonstrated using the well-known ECL coreactant 2-(dibutylamino)ethanol (DBAE) as a model analyte, which can be detected to a level of 10 nM with a linear range between 10(-8) and 10(-4) M.
Publisher: Wiley
Date: 2003
DOI: 10.1002/SIA.1634
Publisher: Springer Science and Business Media LLC
Date: 06-01-2016
DOI: 10.1557/ADV.2015.51
Publisher: Elsevier BV
Date: 02-2007
Publisher: Wiley
Date: 08-2015
Publisher: Elsevier BV
Date: 08-2005
Publisher: Elsevier BV
Date: 10-2023
Publisher: IOP Publishing
Date: 21-11-2014
DOI: 10.1088/0957-4484/25/49/495607
Abstract: A novel ultrasonicated-ozonolysis (USO) processing method has been applied to commercially available exfoliated graphite (EG) with the aim of producing stable aqueous graphitic nanoplatelet (GNP) dispersions that are suitable for ink-jet printing and electrophoretic deposition. The processing has been compared to other low energy and environmentally friendly electrochemical exfoliation (EE) techniques. The results show USO can be used to prepare highly stable aqueous dispersions from both low and high surface area EG. The level of oxygen functionalization can be easily controlled with processing time as can the dispersion concentration. The degree of disorder in the GNP structure is similar to existing EE methods but offers higher yields without the need to remove any chemicals post-processing. Ink-jet printing onto heated quartz substrates produced films which reached electrical conductivities of 1400 s m(-1) after annealing. The films printed from USO-processed EGs had higher conductivity and significantly reduced thickness as compared to films printed from aqueous dispersions of reduced graphene oxide.
Publisher: American Chemical Society (ACS)
Date: 25-01-2005
DOI: 10.1021/LA048191X
Abstract: The adsorption and decomposition pathways of 1-propanethiol on a Ga-rich GaAs(100) surface have been investigated using the techniques of temperature programmed desorption, X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectrometry (TOF-SIMS). 1-Propanethiol adsorbs dissociatively on a clean GaAs(100) surface to form propanethiolate and hydrogen. Further reactions of these species to form new products compete with the recombinative desorption of molecular propanethiol. The C-S bond scission in the propanethiolate results in the formation of propyl species and elemental sulfur. The generation of propene via beta-hydride elimination then follows. In addition, propane and hydrogen form via reductive elimination processes. A recombinative high-temperature propanethiol desorption state is also observed. XPS and TOF-SIMS analyses confirm the presence of sulfur on the GaAs(100) surface following thermal decomposition. This paper discusses the mechanisms by which these products form on the GaAs(100) surface.
Publisher: Elsevier BV
Date: 04-2004
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TB01828F
Abstract: Well-controlled low fouling polymers brushes were grafted from the surface of biodegradable electrospun fibres for advanced tissue engineering applications.
Publisher: Wiley
Date: 03-08-2009
Publisher: Informa UK Limited
Date: 2005
Publisher: The Electrochemical Society
Date: 2006
DOI: 10.1149/1.2164726
Publisher: American Chemical Society (ACS)
Date: 11-07-2008
DOI: 10.1021/LA8002788
Abstract: Fluoropolymer plasma coatings have been investigated for application as stent coatings due to their chemical stability, conformability, and hydrophobic properties. The challenge resides in the capacity for these coatings to remain adherent, stable, and cohesive after the in vivo stent expansion, which can generate local plastic deformation of up to 25%. Plasma-coated s les have been prepared by a multistep process on 316L stainless steel substrates, and some coated s les were plastically deformed to mimic a stent expansion. Analyses were then performed by X-ray photoelectron spectroscopy (XPS), X-ray photoelectron emission microscopy (X-PEEM), and time-of-flight secondary ion mass spectrometry (TOF-SIMS) to determine the chemical and physical effects of such a deformation on both the coating and the interfacial region. While XPS analyses always showed a continuous coating with no significant effect of the deformation, TOF-SIMS and near-edge X-ray absorption fine structure (derived from X-PEEM) data indicated the presence of a certain density of porosity and pinholes in all coatings as well as sparse fissures and molecular fragmentation in the deformed ones. The smallness of the area fraction affected by the defects and the subtlety of the chemical changes could only be evidenced through the higher chemical sensitivity of these latter techniques.
Publisher: Elsevier BV
Date: 04-2005
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TC03704B
Abstract: Metallic Fe nanoparticles (NPs) were electrodeposited onto ozone functionalized carbon nanotubes (CNTs) to produce ferromagnetic carbon nanomaterials.
Publisher: Elsevier BV
Date: 07-2006
Publisher: Elsevier BV
Date: 06-2017
DOI: 10.1016/J.ACTBIO.2017.03.038
Abstract: Antibody orientation at solid phase interfaces plays a critical role in the sensitive detection of biomolecules during immunoassays. Correctly oriented antibodies with solution-facing antigen binding regions have improved antigen capture as compared to their randomly oriented counterparts. Direct characterization of oriented proteins with surface analysis methods still remains a challenge however surface sensitive techniques such as Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) provide information-rich data that can be used to probe antibody orientation. Diethylene glycol dimethyl ether plasma polymers (DGpp) functionalized with chromium (DGpp+Cr) have improved immunoassay performance that is indicative of preferential antibody orientation. Herein, ToF-SIMS data from proteolytic fragments of anti-EGFR antibody bound to DGpp and DGpp+Cr are used to construct artificial neural network (ANN) and principal component analysis (PCA) models indicative of correctly oriented systems. Whole antibody s les (IgG) test against each of the models indicated preferential antibody orientation on DGpp+Cr. Cross-reference between ANN and PCA models yield 20 mass fragments associated with F(ab') Controlled orientation of antibodies at solid phases is critical for maximizing antigen detection in biosensors and immunoassays. Surface-sensitive techniques (such as ToF-SIMS), capable of direct characterization of surface immobilized and oriented antibodies, are under-utilized in current practice. Selection of a small number of mass fragments for analysis, typically pertaining to amino acids, is commonplace in literature, leaving the majority of the information-rich spectra unanalyzed. The novelty of this work is the utilization of a comprehensive, unbiased mass fragment list and the employment of principal component analysis (PCA) and artificial neural network (ANN) models in a unique methodology to prove antibody orientation. This methodology is of significant and broad interest to the scientific community as it is applicable to a range of substrates and allows for direct, label-free characterization of surface bound proteins.
Publisher: Elsevier BV
Date: 04-2004
Publisher: American Chemical Society (ACS)
Date: 11-10-2011
DOI: 10.1021/JP207939S
Publisher: Elsevier BV
Date: 11-2008
Publisher: American Chemical Society (ACS)
Date: 27-12-2019
DOI: 10.1021/ACS.BIOMAC.8B01427
Abstract: Electrospun ultrafine fibers prepared using a blend of poly(lactide- co-glycolide) (PLGA) and bromine terminated poly(l-lactide) (PLA-Br), were surface modified using surface-initiated (SI) Cu(0) mediated polymerization. Copolymers based on N-acryloxysuccinimide (NAS) and a low fouling monomer (either N, N-dimethylacrylamide (DMA), N-(2-hydroxypropyl)acrylamide (HPA), or N-acryloylmorpholine (NAM)) were grafted from the fiber surface to impart surface functionality and to reduce nonspecific protein adsorption. Inclusion of the functional NAS monomer facilitated the conjugation of a nonbioactive cyclic RAD peptide and a bioactive cyclic RGD peptide, the latter expected to facilitate cell adhesion through its affinity for the α
Publisher: American Chemical Society (ACS)
Date: 28-04-2006
DOI: 10.1021/EF0502251
Publisher: Elsevier BV
Date: 11-2006
Publisher: Elsevier BV
Date: 04-2005
Start Date: 09-2008
End Date: 12-2010
Amount: $350,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2003
End Date: 08-2006
Amount: $377,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2005
End Date: 12-2006
Amount: $406,385.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2006
End Date: 12-2006
Amount: $485,000.00
Funder: Australian Research Council
View Funded Activity