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dc.contributor.authorShakhsher, Ziad M.
dc.contributor.authorOdeh, Imad M.A.
dc.contributor.authorRajabi, Inas M.S.
dc.contributor.authorKhatib, Mahmoud K.
dc.date.accessioned2018-09-03T10:34:33Z
dc.date.available2018-09-03T10:34:33Z
dc.date.issued2010-10-08
dc.identifier.issn1424-8220
dc.identifier.urihttps://dspace.alquds.edu/handle/20.500.12213/808
dc.description.abstractIn this study, a new modified optical chemical sensor based on swellable polymer microspheres is developed using a 5% copolymer of polyvinylpyridine-polyvinyl -benzyl chloride microspheres functionalized as the corresponding dithiocarbamate. This sensor demonstrated significant enhancements in sensitivity, dynamic range and response time. These improvements are related to the presence of pyridine in the polymer backbone, which is believed to increase the space between the groups, thus decreasing steric hindrance, and hence increasing substitution of the dithiocarbamate group. The hydrophilicity of pyridine also allows free movement of the solvent and analyte to and from the inside of the microspheres. These dithiocarbamate-derivatized polymer microspheres were embedded in a hydrogel matrix of polyvinylalcohol cross-linked with glutaraldehyde. This sensor responded selectively to Hg2+ solutions of different concentrations (1 × 10−5 M to 0.1 M). The observed turbidity measured as absorbance varied between 1.05 and 1.75 units at a wavelength of 700 nm. The response is based on the interaction between the metal cations with the negative charges of the deprotonated dithiocarbamate functional group, which led to neutratization of the charges and thus to polymer shrinking. As a result, an increase in the turbidity of the sensing element due to a change in the refractive index between the hydrogel and the polymer microspheres occured. The changes in the turbidity of the sensing element were measured as absorbance using a conventional spectrophotometer.en_US
dc.description.sponsorshipWe are grateful to W.R. Seitz and his research group at the University of New Hampshire (USA) for their fruitful comments and for supplying us with the copolymer polyvinylpyridinepolyvinylbenzylchloride. We are also grateful to the Palestinian Ministry of Higher Education and to A.E.D. (USA) for financial support.en_US
dc.language.isoen_USen_US
dc.publisherMDPIen_US
dc.subjectoptical sensoren_US
dc.subjectdithiocarbamate-copolymeren_US
dc.subjectpolymer swellingen_US
dc.titleOptical Sensing Properties of Dithiocarbamate-Functionalized Microspheres, Using a Polyvinylpyridine-Polyvinylbenzyl Chloride Copolymeren_US
dc.typeArticleen_US


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