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Citation: ZHENG Ou, WAN Nanhong, ZHOU Mingming, ZHOU Longrui, CHEN Tixian, LIU Xiaowei. Effect of pH on the Dispersion Characteristics of Fumed Silica[J]. Chinese Journal of Applied Chemistry, ;2011, 28(12): 1448-1452. doi: 10.3724/SP.J.1095.2011.00761 shu

Effect of pH on the Dispersion Characteristics of Fumed Silica

1.
a Department of Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002;
2.
b New Energy Technology Research Institute, Zhejiang Chaowei Power Co., Ltd, Changxing 313100

Corresponding author: ZHENG Ou,
Received Date: 27 December 2010
Available Online: 21 March 2011
Fund Project: 福州大学科技发展基金(2008-XQ-09) (2008-XQ-09)福州大学人才基金(XRC-0820) (XRC-0820)

The effect of pH on the particle distribution and zeta potential of the fumed silica(SiO₂) suspended in H₂SO₄ or NaOH aqueous solution and their relationship were investigated with laser dynamic light scattering(DSL).The experiment showed that the isoelectric point(IEP) and titration end(TE) of silanol were at pH(IEP)=2.09 and pH(TE)=7.47,respectively,and a simple method was given for the determination of Si-OH concentration on SiO₂ particle surface based on pH(TE).The dispersed phase particle size measurement showed that between IEP and TE,the hydration radius of SiO₂ was stabilized near 230 nm;in H₂SO₄ medium,when pH< pH(IEP),the apparent hydration radius of SiO₂ increased with the increased H₂SO₄ concentration due to the coalescence of dispersed SiO₂ aggregates;in NaOH medium,when pH >pH(TE),the SiO₂ aggregates decomposed and the apparent size of the dispersed phase decreased with increasing the NaOH concentration,which showed that NaOH can promote the dispersion stability of fumed silica in aqueous.
- fumed silica,
- laser dynamic light scattering,
- zeta potential,
- Si-OH concentration
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