Heymann A, Stipp A, Sinn C, Palberg T
Institut für Physik der, Johannes-Gutenberg-Universität, Staudingerweg 7, Mainz, 55099, Germany
J Colloid Interface Sci. 1998 Nov 1;207(1):119-127. doi: 10.1006/jcis.1998.5761.
We report time-resolved Bragg scattering experiments on solidifying colloidal suspensions of hard spheres. The polar angle-averaged, integrated intensity of the (111) and (311) reflections show a transient, two-step behavior below melting, which depends in a complex way on the volume fraction and is not present for (200) or (220). Detailed analysis of the full two-dimensional scattering pattern reveals intensity maxima of sixfold symmetry close to the position of the (111) and (311) Debye-Scherrer rings. These can be explained assuming oriented crystals with close-packed planes parallel to the container walls. We show that the observed temporal behavior is due to competing homogeneous and heterogeneous nucleation and growth scenarios. Copyright 1998 Academic Press.
我们报道了对硬球固化胶体悬浮液进行的时间分辨布拉格散射实验。（111）和（311）反射的极角平均积分强度在熔点以下呈现出一种瞬态的两步行为，这种行为以复杂的方式依赖于体积分数，而（200）或（220）反射则不存在这种行为。对完整二维散射图案的详细分析揭示，在（111）和（311）德拜 - 谢乐环位置附近存在六重对称的强度最大值。这些可以通过假设具有与容器壁平行的密排平面的取向晶体来解释。我们表明，观察到的时间行为是由于均匀成核和异质成核与生长过程相互竞争所致。版权所有1998年学术出版社。
