Yield stress measurements and microstructure of colloidal kaolin powders clusterized and dispersed in different liquids

查看全文 作　　者：Dario [1]T.Beruto;Alberto [1]Lagazzo;Rodolfo [1]Botter;Roberto [2]Grillo

机构地区：[1]Department of Civil,Environmental and Architectural Engineering (DICAT),University of Genoa,P.le Kennedy (Fiera del Mare),Pad. D,16129-Genoa,Italy;[2]Artigo S.p.A.,loc.Carpeneto,17014-Cairo Montenotte (SV),Italy

出　　处：《Particuology》索引2009年第7卷第6期,共7页

基　　金：part of a research program between the University of Genoa and the Artigo S.p.A. 摘　　要：Rheological measurements of four colloidal kaolin powders dispersed in water, paraffinic oil and liquid rubber have been done at solid concentration (VS/VL) in the range 8-33%. In quasi-static conditions the yield stress values were derived. An S-shaped relationship between and exists, that allows to evaluate the percolation threshold c values. In water c ranges between 29% and 33%, while it is between 17% and 21% in oil and in liquid rubber. In water the microstructure units, i.e. the primary clusters among kaolin crystallites, are denser and bigger than the ones in the two other liquids. Furthermore, in quasistatic condition, the aqueous microstructure units have less tendency to cling together to form a network that can span all over the liquid phase. The different kaolin dispersions at equal to 22% are characterized by yield stress ranging between 7.5 Pa and 59 Pa in water, 66-250 Pa in oil and 230-770 Pa in liquid rubber. It has been found that for any kaolin types the log evaluated near to the percolation threshold is a conservative parameter of the three different liquids. These results are useful to design colloidal dispersions with selected microstructure. 关键词：高岭土粉体液体橡胶应力测量屈服应力分散胶体微观结构设计渗流阈值

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Yield stress measurements and microstructure of colloidal kaolin powders clusterized and dispersed in different liquids

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