Core-and-shell nature of Strober silica particles

dc.creatorLeite, CAP
dc.creatorde Souza, EF
dc.creatorGalembeck, F
dc.date2001
dc.dateJUL-AUG
dc.date2014-11-16T12:21:18Z
dc.date2015-11-26T17:24:52Z
dc.date2014-11-16T12:21:18Z
dc.date2015-11-26T17:24:52Z
dc.date.accessioned2018-03-29T00:12:09Z
dc.date.available2018-03-29T00:12:09Z
dc.identifierJournal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 12, n. 4, n. 519, n. 525, 2001.
dc.identifier0103-5053
dc.identifierWOS:000169920500013
dc.identifier10.1590/S0103-50532001000400013
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/57214
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/57214
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/57214
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1284187
dc.descriptionTwo different samples of monodisperse Stober silica particles were examined in the analytical transmission electron microscope, using different imaging modes: bright-field, dark-field, energy-loss and elemental distribution maps. The particles (effective diameters = 141 and 36 nm) are formed by domains of variable O/Si ratio, which is consistent with a variable degree of hydration, and they coexist with particles with a high O/Si ratio measuring a few nanometers only, which appear dispersed in the picture background. Bright-field and energy-loss images of the larger particles show a core-and-shell morphology, and the shells have a higher amount of high-O/Si domains as well as contaminating carbon compounds. On the other hand, the smaller particles (effective diameter = 36 nm) are also formed by distinct domains, but their morphology is neither spherical or core-and-shell. The mechanisms for particle formation presented in the literature are discussed, considering the present findings.
dc.description12
dc.description4
dc.description519
dc.description525
dc.languageen
dc.publisherSoc Brasileira Quimica
dc.publisherSao Paulo
dc.publisherBrasil
dc.relationJournal Of The Brazilian Chemical Society
dc.relationJ. Braz. Chem. Soc.
dc.rightsaberto
dc.sourceWeb of Science
dc.subjectcolloidal silica
dc.subjecttransmission electron microscopy
dc.subjectenergy-filtered imaging
dc.subjectsilica particle microchemistry
dc.subjectDynamic Light-scattering
dc.subjectX-ray-scattering
dc.subjectCatalyzed-hydrolysis
dc.subjectSol-gel
dc.subjectSize
dc.subjectAlkoxides
dc.subjectGrowth
dc.subjectCondensation
dc.subjectDispersions
dc.subjectSpheres
dc.titleCore-and-shell nature of Strober silica particles
dc.typeArtículos de revistas


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