Formation of a supramolecular gel between alpha-cyclodextrin and free and adsorbed PEO on the surface of colloidal silica: Effect of temperature, solvent, and particle size

dc.creatorDreiss, CA
dc.creatorCosgrove, T
dc.creatorNewby, FN
dc.creatorSabadini, E
dc.date2004
dc.dateOCT 12
dc.date2014-11-19T20:59:07Z
dc.date2015-11-26T16:29:38Z
dc.date2014-11-19T20:59:07Z
dc.date2015-11-26T16:29:38Z
dc.date.accessioned2018-03-28T23:10:42Z
dc.date.available2018-03-28T23:10:42Z
dc.identifierLangmuir. Amer Chemical Soc, v. 20, n. 21, n. 9124, n. 9129, 2004.
dc.identifier0743-7463
dc.identifierWOS:000224391600028
dc.identifier10.1021/la049495m
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/67048
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/67048
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/67048
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1269777
dc.descriptionAqueous solutions of alpha-cyclodextrin (alpha-CD) complex spontaneously with poly(ethylene oxide) (PEO), forming a supramolecular structure known as pseudopolyrotaxane. We have studied the formation of the complex obtained from the threading of alpha-CD onto PEO, both free in solution and adsorbed on colloidal silica. The kinetics of the reaction were studied by gravimetric methods and determined as a function of temperature and solvent composition for the PEO free in solution. PEO was then adsorbed on the surface of colloidal silica particles, and the monomers were displaced by systematically varying the degree of complexation, the concentration of particles, and the molecular weight of the polymer. The effect of the size of the silica particles on the yield of the reaction was also studied. With the adsorbed PEO, the complexation was found to be partial and to take place from the tails of the polymer. The formation of a gel network containing silica at high degrees of complexation was observed. Small-angle X-ray and neutron scattering experiments were performed to study the configuration of the polymeric chains and confirmed the partial desorption of the polymer from the surface of the silica upon complexation.
dc.description20
dc.description21
dc.description9124
dc.description9129
dc.languageen
dc.publisherAmer Chemical Soc
dc.publisherWashington
dc.publisherEUA
dc.relationLangmuir
dc.relationLangmuir
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectInclusion Compound Formation
dc.subjectPoly(ethylene Oxide)
dc.subjectMolecular-weight
dc.subjectAqueous-solution
dc.subjectPolymer
dc.subjectPolypseudorotaxanes
dc.subjectComplexation
dc.subjectTransition
dc.subjectDimensions
dc.titleFormation of a supramolecular gel between alpha-cyclodextrin and free and adsorbed PEO on the surface of colloidal silica: Effect of temperature, solvent, and particle size
dc.typeArtículos de revistas


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