Kashchiev D, Kaneko N, Sato K
Institute of Physical Chemistry, Bulgarian Academy of Sciences, Ul. Acad. G. Bonchev 11, Sofia, 1113, Bulgaria
J Colloid Interface Sci. 1998 Dec 1;208(1):167-177. doi: 10.1006/jcis.1998.5760.
The kinetics of isothermal crystallization of the droplets in polydisperse emulsions are analyzed under the condition that each emulsion droplet gives birth to one nucleus only. Expressions are derived for the time dependences of the number of crystallized droplets and the fraction of crystallized droplet volume in the cases of either volume or surface nucleation of the crystals in the droplets. The time for half-crystallization is determined as a function of the emulsion polydispersity, and it is found that the more polydisperse the emulsion, the shorter this time in comparison with that for the corresponding monodisperse emulsion. Formulae are also obtained for the change of the velocity Kv of propagation of ultrasound through polydisperse emulsions during the time t of isothermal crystallization of the droplets in them. Good agreement is found between theory and experiment in an analysis of available Kv(t) data for crystallization in polydisperse palm oil-in-water and n-hexadecane-in-water emulsions. The results obtained are directly applicable to devitrification and polymorphic transformation of disperse solid phases. Copyright 1998 Academic Press.
在仅每个乳液滴产生一个晶核的条件下，分析了多分散乳液中液滴的等温结晶动力学。推导了在液滴中晶体为体积成核或表面成核情况下，结晶液滴数量和结晶液滴体积分数随时间变化的表达式。确定了半结晶时间作为乳液多分散性的函数，发现乳液的多分散性越高，与相应单分散乳液相比，该时间越短。还得到了在液滴等温结晶时间t内，超声在多分散乳液中传播速度Kv变化的公式。在分析多分散水包油棕榈油乳液和水包正十六烷乳液结晶的现有Kv(t)数据时，理论与实验结果吻合良好。所得结果直接适用于分散固相的脱玻化和多晶转变。版权所有1998年学术出版社。
