Oxygen diffusion into polystyrene-bentonite films

dc.contributor.authorUğur, Şaziye
dc.contributor.authorYargı, Önder
dc.contributor.authorPekcan, Önder
dc.date.accessioned2019-06-27T08:05:39Z
dc.date.available2019-06-27T08:05:39Z
dc.date.issued2009
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Biyoinformatik ve Genetik Bölümüen_US
dc.description.abstractA simple fluorescence technique is proposed for the measurement of the diffusion coefficient of oxygen into polystyrene-clay composite films. The composite films were prepared from the mixture of surfactant-free pyrene (P)-labeled polystyrene latexes (PS) and modified bentonite (MNaLB) at various compositions at room temperature. These films were annealed at 200 degrees C above the glass transition (T-g) temperature of polystyrene for 10 min. Oxygen diffusion into the films was monitored with steady state fluorescence (SSF) measurements. Measurements were performed at room temperature for different film compositions (0 510 2030 50 and 60 mass% modified bentonite) films to evaluate the effect of MNaLB content on oxygen diffusion. The diffusion coefficient D of oxygen was determined by the fluorescence quenching method by assuming Fickian transport and increased from 7.4 x 10(-10) to 26.9 x 10(-10) cm(2) s(-1) with increasing MNaLB content. This increase in D value was explained by formation of microvoids in the film. These voids are large enough to contribute to the penetration of oxygen molecules through the films. The montmorillonite content did not affect the quenching rate constant k(q) and mutual diffusion coefficient D-m values. (C) 2008 Elsevier B.V. All rights reserveden_US]
dc.identifier.citation10
dc.identifier.doi10.1016/j.clay.2008.10.008en_US
dc.identifier.endpage452
dc.identifier.issn0169-1317en_US
dc.identifier.issn1872-9053en_US
dc.identifier.issn0169-1317
dc.identifier.issn1872-9053
dc.identifier.issue3-4
dc.identifier.scopus2-s2.0-60549102852en_US
dc.identifier.scopusqualityQ1
dc.identifier.startpage447en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1100
dc.identifier.urihttps://doi.org/10.1016/j.clay.2008.10.008
dc.identifier.volume43en_US
dc.identifier.wosWOS:000264422300024en_US
dc.identifier.wosqualityQ1
dc.institutionauthorPekcan, Önderen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.journalApplied Clay Scienceen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectPolystyreneen_US
dc.subjectBentoniteen_US
dc.subjectComposite filmen_US
dc.subjectFluorescenceen_US
dc.subjectQuenchingen_US
dc.subjectDiffusionen_US
dc.titleOxygen diffusion into polystyrene-bentonite filmsen_US
dc.typeArticleen_US
dspace.entity.typePublication

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