Structural transitions in aqueous suspensions of natural graphite

被引：29

作者：

Moraru, V ^{[1
]}

Lebovka, N ^{[1
]}

Shevchenko, D ^{[1
]}

机构：

[1] Natl Acad Sci Ukraine, FD Ovcharenko Inst Biocolloidal Chem, UA-03142 Kiev, Ukraine

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2004年 / 242卷 / 1-3期

关键词：

aqueous graphite suspensions; electric conductivity; viscosity; percolation transition; sol-gel transition;

D O I：

10.1016/j.colsurfa.2004.04.064

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 electric conductivity sigma and viscosity eta of aqueous suspensions at different volume fraction of graphite psi and concentration of nonionic surfactant (Triton X-305) are investigated. The correlations between conductivity and theological properties are discussed. A model of structural transitions in aqueous graphite suspensions is discussed. Two structural transitions, corresponding to changes in electrical and rheomechanical properties, are identified as electrical connectivity and rigidity (or sol-gel) percolation transitions, respectively. An unusual initial decrease of the bulk electrical conductivity with graphite volume fraction psi increase was observed in the surfactant solution. This fact is explained as a result of an isolating coating formation around the graphite particles. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：181 / 187

页数：7

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