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
收藏
页码：360 / 365
页数：6
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