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The antioxidant activity of conducting polymers in biomedical applications
Paul A. Kilmartin,Corrina Thompson,Jadranka Travas-Sejdic,Graham A. Bowmaker,Ralph P. Cooney,Marija Gizdavic-Nikolaidis 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The radical scavenging ability of soluble conducting polymers has been examined using the DPPH assay in comparison withphenolic antioxidant compounds present in the diet. The reducing strength was also determined by voltammetry at a carbonelectrode both in an aqueous pH 7.0 buer, and in methanol as used for the DPPH assay. The conducting polymers were shown tobe good reducing agents and eective scavengers of free radicals, with 24 DPPH radicals being reduced for each aniline or pyrroleunit on the polymer chains. The signicance of this antioxidant capacity for the application of conducting polymers as biomaterialsis considered.
Polyaniline-based microelectrodes for sensing ascorbic acid in beverages
Paul A. Kilmartin,A. Martinez,P.N. Bartlett 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Thin lms of polyaniline containing the dopant ions polyvinylsulfonate (PVS) and polystyrenesulfonate (PSS) have been prepared on25 l m Pt disk microelectrodes and tested for ascorbic acid oxidation in various buers and in wine and orange juice containing solutions.neutral pH buer, with minimal interference from other oxidisable compounds. However, unknown wine and juice components lessenthe ascorbic acid oxidation current through their interaction with the polyaniline layer.
Spectroscopic studies of doping reactions in polypyrrole actuators
Paul A. Kilmartin,Kwong-Chi Li,Graham A. Bowmaker,Nicholas A. Vigar,Ralph P. Cooney,adranka Travas-Sejd 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Thin lms of polypyrrole were electropolymerised on a platinum electrode in electrolytes containing the small mobile chloride anion,laser excitations of 488 nm and 785 nm. Cyclic voltammetry indicated that anion movement dominates the redox processes in a KClelectrolyte, and cation movement in NaDBS media, while in K2SO4 both anions and cations are involved during doping and dedoping.The reduction of polpyrrole was eectively monitored by the increase of the 1555 cm. 1 band (mC@ C) using the 488 nm laser, and theoxidation of polpyrrole by the appearance of a band at 921 cm. 1 (d.
Evaluation of antioxidant activity of aniline and polyaniline
M. Gizdavic-Nikolaidis,R. P. Cooney,J. Travas-Sejdic,P. A. Kilmartin,G. A. Bowmaker 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The ability of aniline and polyaniline (PANI) samples to act as antioxidants using the 1,1-diphenyl-2-picrylhydrazyl (DPPH)free-radical method are investigated by applying UVVIS and ESR spectroscopy. The UVVIS spectra of reaction mixtures inMeOH showed that PANI is more eective than aniline in eliminating the DPPH radicals by a factor of 5.8, while HCl-doped PANIwas about 1.7 times more eective than PANI. A study of the kinetics of the reaction between DPPH and aniline showed that thereaction is rst order with respect to DPPH and approximately second order with respect to aniline. The relationship between thisand a previously proposed mechanism for this reaction is discussed.
MICROLENSING EVENT MOA-2007-BLG-400: EXHUMING THE BURIED SIGNATURE OF A COOL, JOVIAN-MASS PLANET
Dong, Subo,Bond, I. A.,Gould, A.,Kozłowski, Szymon,Miyake, N.,Gaudi, B. S.,Bennett, D. P.,Abe, F.,Gilmore, A. C.,Fukui, A.,Furusawa, K.,Hearnshaw, J. B.,Itow, Y.,Kamiya, K.,Kilmartin, P. M.,Korpela, A IOP Publishing 2009 The Astrophysical journal Vol.698 No.2
Effect of deposition current density on the linear actuation behaviour of PPy(CF₃SO₃) films
Shu Yi Chu,Hui Peng,Paul A. Kilmartin,Graham A. Bowmaker,Ralph P. Cooney 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Free-standing lms of PPy(CF₃SO₃) were galvanostatically electropolymerised in propylene carbonate on a stainless steel electrodeusing dierent deposition current densities. The actuation performance of these lms in an aqueous 1.0 M NaPF6 electrolyte was inves-linear strain of the lms decreased with a higher deposition current density. X-ray photoelectron spectroscopy was used to estimate theamount of ‘disordered carbon’, carbonyl carbon and the doping level of the lms. These values were related to the strain obtained fromECMD measurements. SEM images revealed a denser lm morphology for lms deposited using a lower current density.