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arXiv 0811.1498cond-mat.softcond-mat.mtrl-sci
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外磁场中二元胶体悬浮液的超快淬灭

Ultra-fast quenching of binary colloidal suspensions in an external magnetic field

Lahcen Assoud, Florian Ebert, Peter Keim, René Messina, Georg Maret, Hartmut Löwen

摘要:

通过突然增加外部磁场,将超快淬火施加到限制在二维水-空气界面处的超顺磁性胶体颗粒的二元混合物。这种骤冷实现了在分子系统中不可能实现的几乎瞬时的冷却。利用实空间实验,探讨了失超后的弛豫行为。在不同的时间尺度上形成了三角形和正方形对称的局域微晶,小粒子的相关峰振幅随时间的非单调演化与布朗动力学的计算机模拟结果一致。

英文摘要:

An ultra-fast quench is applied to binary mixtures of superparamagnetic colloidal particles confined at a two-dimensional water-air interface by a sudden increase of an external magnetic field. This quench realizes a virtually instantaneous cooling which is impossible in molecular systems. Using real-space experiments, the relaxation behavior after the quench is explored. Local crystallites with triangular and square symmetry are formed on different time scales and the correlation peak amplitude of the small particles evolves nonmonotonically in time in agreement with Brownian dynamics computer simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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