Article ID Journal Published Year Pages File Type
143863 Advanced Powder Technology 2014 7 Pages PDF
Abstract

•We prepared silica sols with sodium silicate and sulfuric acid by a Y-shaped reactor.•Controlling the pH can change the gelling time, gel structure, and powder property.•The addition of NaCl can change the gelling time and the gel instantaneous modulus.

In this paper, we report the effects of pH and salt on the gelling properties of silica (SiO2) sols and gels which were measured both by dynamic viscoelasticity measurement and by creep test equipment. The network structures built by SiO2 particles formed under different conditions were observed by a scanning probe microscope (SPM). N2 adsorption measurements were also conducted in order to analyze the characteristics of dried gel powders including specific surface area, pore volume, and pore size distribution. The objective of this study is to characterize the SiO2 sol, gels, and powders obtained by a Y-shaped reactor under different pH and salt conditions.

Graphical abstractRheological properties of silica sols with different preparation conditions.Figure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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