Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 00 Praha 6, Czech Republic.
J Chem Phys. 2011 Mar 7;134(9):094508. doi: 10.1063/1.3559453.
This work deals with the nucleation of crystals in confined systems in response to the recent high interest in research on crystallization in emulsion and microemulsion droplets. In these confined systems, crystallization often occurs at high supercooling; thus, nucleation determines the overall crystallization process. A decrease in the volume of the confined mother phase leads to the higher supercooling needed for the phase transition. We have numerically solved kinetic equations in order to determine the conditions under which the first crystal nuclei are formed by homogeneous and heterogeneous nucleation from supercooled melt and supersaturated solution, depending on the volume of the mother phase. Supersaturation (or supercooling) increases with decreasing volume of the mother phase. The nucleation barrier depends linearly on the logarithm of volume of the mother phase in all cases under consideration, as follows from the numerical solution of kinetic equations.
这项工作涉及受限体系中晶体成核的问题，这是对乳液和微乳液液滴中结晶研究的最新热点的回应。在这些受限体系中，结晶通常在过冷度很高的情况下发生；因此，成核决定了整个结晶过程。受限母相的体积减小会导致相变所需的过冷度增加。我们通过数值求解动力学方程，确定了在何种条件下，从过冷熔体和过饱和溶液中通过均相成核和异相成核形成第一晶核，这取决于母相的体积。过饱和度（或过冷度）随母相体积的减小而增加。成核势垒在所有考虑的情况下都与母相体积的对数呈线性关系，这是从动力学方程的数值解中得出的。
