Structural and adsorption features of amorphous nanosilica modified by various addition of polymethylsiloxane

Abstract

alone and in the blends were characterized using microscopy, nitrogen adsorption, infrared spectroscopy, thermogravimetry, and quantum chemistry. It was shown that the properties of the blends depend not only on the components content but also on mechanical treatment causing stronger compaction of the secondary structures of nanoparticles (aggregates of nanoparticles and agglomerates of aggregates) with increasing mechanical loading. Note that a similar behavior of various blends with hydrophobic and hydrophilic nanostructured materials was observed after hydro-compaction under different mechanical loadings. Theoretical modelling shows that the structure of bound water located at a surface of hydrophilic and hydrophobic nanoparticles changes with compaction of aggregates because of changes in the confined space effects and polarity of bound water molecules. These results reflect a general regularity appearing at appropriate amount of added water and certain mechanical loading onto the blends of hydrophilic and hydrophobic nanostructured materials, which become hydrophilic but renew the hydrophobic properties after subsequent drying.

Nano-Silica Modified with Diamine for Capturing Azo Dye from Aqueous Solutions

“…Nano-silica has many attractive properties such as a low cost, high surface area, and being rich in silanol groups, which make it easy to introduce specific functional groups according to the target application [ 26 , 27 ], its nontoxic and biocompatible nature, and its high thermal and chemical stabilities. Furthermore, the structural and morphological properties of nano-silica can be tuned by controlling the synthesis conditions [ 11 ].…”