Ultrafast Quenching of Binary Colloidal Suspensions in an External Magnetic Field
Ultrafast Quenching of Binary Colloidal Suspensions in an External Magnetic Field
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DOI：
10.1103/physrevlett.102.238301
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发表时间：
2009-06-12
影响因子：
8.6
通讯作者：
Loewen, Hartmut
中科院分区：
文献类型：
--
作者：
Assoud, Lahcen;Ebert, Florian;Loewen, Hartmut
利用外加磁场的突然增强，对二维水气界面的超顺磁胶体粒子二元混合物进行了超快猝灭。这种淬火实现了在分子系统中几乎不可能实现的瞬时冷却。利用实空间实验，探讨了淬火后的弛豫行为。在不同的时间尺度上形成了具有三角形和方形对称性的局部晶体，小颗粒的相关峰值振幅随时间呈非单调变化，与布朗动力学计算机模拟结果一致。
An ultrafast 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.