Radiation immobilization of poly(methyloctylsiloxane) on silica for use in HPLC: a uniform layer model

dc.creatorJardim, ICSF
dc.creatorCollins, KE
dc.creatorAnazawa, TA
dc.date1999
dc.date45108
dc.date2014-12-02T16:30:00Z
dc.date2015-11-26T16:43:34Z
dc.date2014-12-02T16:30:00Z
dc.date2015-11-26T16:43:34Z
dc.date.accessioned2018-03-28T23:28:37Z
dc.date.available2018-03-28T23:28:37Z
dc.identifierJournal Of Chromatography A. Elsevier Science Bv, v. 849, n. 2, n. 299, n. 307, 1999.
dc.identifier0021-9673
dc.identifierWOS:000081668400001
dc.identifier10.1016/S0021-9673(99)00555-5
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/58786
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/58786
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/58786
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1273632
dc.descriptionPoly(methyloctylsiloxane) (PMOS) was sorbed into the pores of HPLC silica by a solvent evaporation procedure, then irradiated with gamma rays from a cobalt-60 source to absorbed doses in the range from 0 to 200 kGy (1Gy=1J kg(-1)). Non-irradiated and irradiated samples were characterized by solvent extraction, specific surface area determination, infrared spectroscopy and reversed-phase column performance. Solvent extraction data reveal that about 40% of the PMOS is not extractable prior to irradiation and this increases to about 75% with radiation doses of 50 kGy or higher. Column performance was improved by the radiation treatment, reaching a maximum efficiency in the dose range of 80-140 kGy while the peak symmetry changed from As=1.7 to 1.1. The improvement is attributed to the increased mass of polymer immobilized by the radiation treatment and to a more uniform distribution of the immobilized polymer in the silica pore system. A multi-layer stationary-phase model is presented in which the first layer consists of an adsorbed monolayer of PMOS and the second layer is immobilzed by gamma radiation. (C) 1999 Elsevier Science B.V. All rights reserved.
dc.description849
dc.description2
dc.description299
dc.description307
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationJournal Of Chromatography A
dc.relationJ. Chromatogr. A
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectimmobilization
dc.subjectradiation immobilization
dc.subjectstationary phases
dc.subjectLC
dc.subjectpolymethyloctylsiloxanes
dc.subjectPhase Liquid-chromatography
dc.subjectReversed-phase
dc.subjectStationary Phases
dc.subjectGamma-radiation
dc.subjectPolymers
dc.subjectParticles
dc.subjectPackings
dc.subjectSurfaces
dc.subjectColumns
dc.subjectGels
dc.titleRadiation immobilization of poly(methyloctylsiloxane) on silica for use in HPLC: a uniform layer model
dc.typeArtículos de revistas


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