Dispersion of barium titanate with polyaspartic acid in aqueous media

被引：69

作者：

Wang, XY

Lee, BI

Mann, L

机构：

[1] Clemson Univ, Dept Ceram & Mat Engn, Clemson, SC 29634 USA

[2] Kemet Elect Corp, Fountain Inn, SC 29644 USA

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2002年 / 202卷 / 01期

基金：

美国国家科学基金会;

关键词：

aqueous; dispersion; barium titanate; polyaspartic acid;

D O I：

10.1016/S0927-7757(01)01062-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The colloidal stability of barium titanate (BT) aqueous suspensions with the sodium salt of polyaspartic acid (PApA-Na) at different pH values has been investigated by means of adsorption isotherm, zeta potential, sedimentation density and rheology characterization. The adsorption of PApA-Na onto BT surfaces is found to be pH dependent. Results show that PApA adsorption follows Langmuir monolayer adsorption isotherms and the amount of PApA-Na required to stabilize aqueous BT suspensions decreased as pH increased. The mechanism of stabilization of BT is shown to be a combination of electrostatic repulsion and steric hindrance under the experiment conditions used. As for the passivating power of PApA-Na, about 7-times reduction in Ba2+ ion leaching in 24 h is observed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：71 / 80

页数：10

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