Peppin S S L, Wettlaufer J S, Worster M G
Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA.
Phys Rev Lett. 2008 Jun 13;100(23):238301. doi: 10.1103/PhysRevLett.100.238301. Epub 2008 Jun 9.
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.
我们描述了一种关于水性胶体悬浮液单向冻结新理论的实验测试。在低冻结速度下，平面冰透镜会完全排斥颗粒，在液体区域形成一个稳态压实边界层。在较高速度下，平面界面在热力学上变得不稳定，并在几何上破裂，从而将大量胶体区域困在其中。通过实验确定了理论稳定性阈值，从而证明胶体悬浮液可以像原子或分子合金一样进行处理。
