کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
594464 | 1453982 | 2011 | 8 صفحه PDF | دانلود رایگان |
Low-temperature 1H NMR spectroscopy was used to study water and concentrated hydrochloric acid solution clustered at a surface of silica A-300 initial and mechanochemically activated (MCA) with the bulk density ρb = 0.045 and 0.394 g/cm3, respectively. Hydrochloric acid solution in contact with silica powder placed in nonpolar (CCl4) or weakly polar (CDCl3) media forms clusters of two types (with different content of HCl and water) in interparticle voids in aggregates of silica nanoparticles. This differentiation is stronger in the system with MCA silica because of enhanced confinement effects in narrower pores (voids) between adjacent nonporous nanoparticles. Obtained results are of importance for deeper insight into the mechanism of the influence of nanosilica used as an oral sorbent on the gastric juice properties.
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► Effects of mechanochemical activation of nanosilica on textural and adsorption characteristics.
► Confined space effects on the characteristics of bound water.
► Effects of silica on interaction of HCl with water.
► Chemical shifts of the proton resonance as a measure of associativity of interfacial water and aqueous solution of HCl.
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 390, Issues 1–3, 20 October 2011, Pages 48–55