Effect of surfactant adsorption on aggregate structure and yield strength of zirconia-wax suspensions

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题名:	Effect of surfactant adsorption on aggregate structure and yield strength of zirconia-wax suspensions
作者:	Tseng WJ;Teng KH
贡献者:	材料所
日期:	2001
上传时间:	2009-12-14 11:08:57 (UTC+8)
摘要:	The suspension structure and strength of the particle network in a flocculated zirconia-wax system have been investigated through capillary extrusion at a temperature above the melting temperature of the wax. Submicrometer zirconia particles were first coated with various amounts of stearic acid for providing steric stabilization of differing degrees before being blended with the wax of a fixed solids fraction (50 vol%). When the acid coverage was similar to 20% of the nominal particle surface, an apparent particle network in a form of connected "dimples" together with isolated wax ligaments was found after shearing. As the acid coverage was raised further, a collection of discrete flocs rather than the particulate network was seen after deformation. The agglomerate flocs reduced their size as the acid adsorption was increased. Yield stress of the suspension, which is a macroscopic property, exhibited a linear dependence with the surface coating. A reduction over 90% in the yield value was found as the surface adsorption increased from 20 to 100% at the working temperature employed. (C) 2001 Kluwer Academic Publishers.
關聯:	JOURNAL OF MATERIALS SCIENCE Volume: 36 Issue: 1 Pages: 173-178
显示于类别:	[化學工程與材料工程學系暨碩士班] 期刊論文

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