ESI-TEM Imaging of surfactants and ions sorbed in Stober silica nanoparticles

dc.creatorCosta, CAR
dc.creatorLeite, CAP
dc.creatorGalembeck, F
dc.date2006
dc.dateAUG 15
dc.date2014-11-16T17:06:44Z
dc.date2015-11-26T16:24:07Z
dc.date2014-11-16T17:06:44Z
dc.date2015-11-26T16:24:07Z
dc.date.accessioned2018-03-28T23:05:09Z
dc.date.available2018-03-28T23:05:09Z
dc.identifierLangmuir. Amer Chemical Soc, v. 22, n. 17, n. 7159, n. 7166, 2006.
dc.identifier0743-7463
dc.identifierWOS:000239596300017
dc.identifier10.1021/la060389p
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/65577
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/65577
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/65577
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1268375
dc.descriptionThe sorption of surfactants and NaCl in silica nanosized particles creates unexpected spatial distributions of solutes that were evidenced by electron spectroscopy imaging in the transmission electron microscope (ESI/TEM). The spectral images show that simple ions (Na(+), Cl(-), Br(-)) are actually absorbed within the particles irrespective of their charges, while surfactant chains are adsorbed at the particle surfaces. The expected effect of the surfactants on particle aggregation is also observed in the micrographs. In the case of salt, close-packed silica particle arrays are formed at low ionic strength, but only coarse aggregates form at higher salt concentrations. The particles absorb both Na(+) and Cl(-) ions in similar amounts, from 0.5 mol L(-1) NaCl, but Na(+) ions are depleted from the particles' immediate outer vicinity, where Cl(-) ions are in turn accumulated. These results confirm that Stober silica nanoparticles are highly porous and reveal their potential usefulness as carriers of small molecules and ions, due to the small particle size, exceptional colloidal stability, and this newly found sorption behavior.
dc.description22
dc.description17
dc.description7159
dc.description7166
dc.languageen
dc.publisherAmer Chemical Soc
dc.publisherWashington
dc.publisherEUA
dc.relationLangmuir
dc.relationLangmuir
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectColloidal Silica
dc.subjectOptical-properties
dc.subjectLatex-particles
dc.subjectSize
dc.subjectAdsorption
dc.subjectStability
dc.subjectPolyelectrolyte
dc.subjectCrystals
dc.subjectEthanol
dc.subjectMicrochemistry
dc.titleESI-TEM Imaging of surfactants and ions sorbed in Stober silica nanoparticles
dc.typeArtículos de revistas


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