Effect of basic stabilizers on the structure of hydrate covers of high disperses silica particles according to 1H NMR spectroscopy data
Анотація
Features of the behavior of bound water layers in aqueous suspensions of nanosilica, initial, after sonication and stabilized by bases: NaOH or ethylenediamine, were investigated at different temperatures. It was shown that the characteristics of the interfacial layers of water and cavities filled by structured water nonmonotonically depend on concentration of solid phase. Dilution of a maximally concentrated suspension by water leads to weakening of many-body interactions. In this case the dependence γS(Csp) is close to linear one, which makes it possible to estimate the energy of interparticle interactions which is about 50 J/g for the suspension stabilized by NaOH. In the suspensions of nanosilica, interparticle voids filled with the structured water are formed with effective radii of 1 – 9 nm.
Посилання
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