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pubmed-article:18373381pubmed:dateCreated2008-4-30lld:pubmed
pubmed-article:18373381pubmed:abstractTextThe microscopic surface structure and hydrogen/deuterium exchange effect were investigated by contrast-variation small-angle neutron scattering (CV-SANS) for three different-sized amorphous colloidal silica aqueous suspensions. The results show that the fraction of hydrogen/deuterium exchange per nanoparticle, phiH/D, strongly depends on the size of silica nanoparticles. This finding supports that the hydrogen/deuterium exchange occurs exclusively within a finite surface layer of silica nanoparticles, while the inner component remained unchanged. Detailed analyses of the scattering intensity functions led to the estimation of (1) phiH/D and (2) the thickness of the surface layer as functions of the particle radius. The surface layer thickness was found to increase from 18 to 35 A with decreasing the particle radius from 165 to 71.2 A. The surface area per unit weight of silica estimated with the CV-SANS results are comparable to those reported in the literature.lld:pubmed
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pubmed-article:18373381pubmed:authorpubmed-author:EndoHitoshiHlld:pubmed
pubmed-article:18373381pubmed:authorpubmed-author:SuzukiTakuyaTlld:pubmed
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pubmed-article:18373381pubmed:year2008lld:pubmed
pubmed-article:18373381pubmed:articleTitleAnalysis of surface structure and hydrogen/deuterium exchange of colloidal silica suspension by contrast-variation small-angle neutron scattering.lld:pubmed
pubmed-article:18373381pubmed:affiliationInstitute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.lld:pubmed
pubmed-article:18373381pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18373381pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed