The effect of alcohol type on the thickness of silica layer of Co3O4@SiO2 core-shell particle

Suppressing the Photocatalytic Activity of Titania by Precisely Controlled Silica Coating

“…Coating with silica is a known example, and the silica coating based on the hydrolysis and condensation of alkoxysilanes has been used extensively. Using the solution-based reactions, thin (submicron level) layers of silica, porous silica, and organosilica have been successfully deposited on various solids including both macroscopic substrates and functional particles. − Coating of silica (and mesoporous silicas) with the thickness of nanometer (nm) ranges on such oxide surfaces as titania, zinc oxide, and iron oxide as well as on polymer particles has been done to obtain core/shell particles, − and some core/silica shell particles were further utilized as a precursor of hollow silica particle (or silica capsule) by the removal of the core through the dissolution or the decomposition. − In such core/shell nanostructures, the homogeneity/uniformity and thickness of the shell are considered as key parameters for tailoring the properties of the core particles in addition to the nanostructures of the shell.…”

A six-fold difference in structure results in a six-order difference in conductivity: silica shell nanoarchitectonics on carbon black particles

“…The variation of the composition and structure of the silica layer designed by hybridization makes the coating more versatile for the preparation of functional composite core–shell particles and the application of the resulting core–shell particles includes bio and medical ones to energy and environmental issues. 12–16…”

“…The thickness of the silica layer on oxide particles has been controlled by changing the TEOS concentration or solvent in the starting solution in the presence of a surfactant and by the repeated coating procedure. 14–18 In the present study, the sample preparation was optimized to obtain a thicker layer of silica on CB by employing a larger amount of TEOS for the coating procedure. Details are given as follows: CTA chloride, deionized water (17.7 g), 28% aqueous ammonia solution (7.2 g) and carbon black (CB, 75 mg) were mixed under ultrasonication for 10 minutes; subsequently, methanol (200 mL) was added and the mixture was sonicated for another 5 minutes.…”