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arXiv 0711.2883cond-mat.softcond-mat.stat-mech
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束缚对:同电荷胶体间长程吸引的直接证据

Bound Pairs: Direct Evidence for Long-range Attraction between Like-Charged Colloids

B. V. R. Tata, P. S. Mohanty, M. C. Valsakumar

摘要:

我们报告的观察稳定的绑定对非常稀的去离子水悬浮液中的高电荷的聚苯乙烯胶体颗粒,与单价抗衡离子,使用共聚焦激光扫描显微镜。通过分析几千个时间序列的共焦图像记录深内部的散装悬浮液,我们发现,测量的对电位,U(r)具有长程吸引力的分量,阱深度大于热能。这些观测结果为同电荷胶体粒子U(r)的长程吸引的存在提供了直接而明确的证据。

英文摘要:

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 a direct and unequivocal evidence for the existence of long-range attraction in U(r) of like-charged colloidal particles.

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