Experimental verification of morphological instability in freezing aqueous colloidal suspensions.
Experimental verification of morphological instability in freezing aqueous colloidal suspensions.
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DOI：
10.1103/physrevlett.100.238301
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
S. Peppin;J. Wettlaufer;M. Worster
中科院分区：
文献类型：
--
作者：
S. Peppin;J. Wettlaufer;M. Worster
我们描述了一种新的水溶液胶体悬浮液单向冻结理论的实验验证。在低冻结速度下，平面冰透镜完全排斥颗粒，在液体区域形成稳定的致密边界层。在较高的速度下，平面界面在热力学上变得不稳定，并在几何上破裂，将大量胶体区域困在其中。通过实验确定了胶体悬浮液的理论稳定性阈值，从而证明胶体悬浮液可以类似于原子或分子合金来处理。
We describe an experimental test of a new theory of the unidirectional freezing of aqueous colloidal suspensions. At low freezing speeds a planar ice lens completely rejects the particles, forming a steady-state compacted boundary layer in the liquid region. At higher speeds the planar interface becomes thermodynamically unstable and breaks down geometrically to trap bulk regions of colloid within. The theoretical stability threshold is determined experimentally, thereby demonstrating that colloidal suspensions can be treated analogously to atomic or molecular alloys.