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- W1983618345 abstract "The 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 Stöber 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." @default.
- W1983618345 created "2016-06-24" @default.
- W1983618345 creator A5069114084 @default.
- W1983618345 creator A5085503959 @default.
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- W1983618345 date "2006-07-18" @default.
- W1983618345 modified "2023-10-17" @default.
- W1983618345 title "ESI-TEM Imaging of Surfactants and Ions Sorbed in Stöber Silica Nanoparticles" @default.
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- W1983618345 doi "https://doi.org/10.1021/la060389p" @default.
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