Bound pairs: Direct evidence for long-range attraction between like-charged colloids

被引：47

作者：

Tata, B. V. R. ^{[1
]}

Mohanty, P. S. ^{[1
]}

Valsakumar, M. C. ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Div Mat Sci, Kalpakkam 603102, Tamil Nadu, India

来源：

SOLID STATE COMMUNICATIONS | 2008年 / 147卷 / 9-10期

关键词：

colloidal dispersions; polystyrene particles; confocal laser scanning microscopy; pair-potential;

D O I：

10.1016/j.ssc.2008.06.026

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report observations of stable bound pairs in very dilute deionized aqueous Suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U(r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide direct and unequivocal evidence for the existence of long-range attraction in U(r) of like-charged colloidal particles. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：360 / 365

页数：6

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