Phase-transition phenomena in colloidal systems with attractive and repulsive Particle interactions
Phase-transition phenomena in colloidal systems with attractive and repulsive Particle interactions
复制标题
具有吸引和排斥粒子相互作用的胶体系统中的相变现象
DOI：
10.1039/dc9909000031
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发表时间：
1990
影响因子：
3.4
通讯作者：
H. Lekkerkerker
中科院分区：
文献类型：
--
作者：
A. Vrij;M. Penders;P. Rouw;C. G. D. Kruif;J. Dhont;C. Smits;H. Lekkerkerker
我们讨论了具有吸引或排斥粒子相互作用的胶体系统中相变的某些方面。所研究的胶体系统是由无定形二氧化硅核组成的球形颗粒在有机溶剂中的分散体，所述无定形二氧化硅核涂覆有各种稳定层。通过适当选择稳定涂层、温度和溶剂，相互作用可以从（急剧）排斥变化到（深度）吸引。在具有吸引相互作用势的系统中，观察到分离成两个浓度不同的液体相。用脉冲诱导临界光散射测量了与此分层过程相关的旋节线的位置。如果相互作用势是排斥的，则观察到结晶。作为胶体颗粒的浓度的函数的微晶的形成速率的研究通过时间分辨光散射。
We discuss certain aspects of phase transitions in colloidal systems with attractive or repulsive particle interactions. The colloidal systems studied are dispersions of spherical particles consisting of an amorphous silica core, coated with a variety of stabilizing layers, in organic solvents. The interaction may be varied from (steeply) repulsive to (deeply) attractive, by an appropriate choice of the stabilizing coating, the temperature and the solvent. In systems with an attractive interaction potential, a separation into two liquid-like phases which differ in concentration is observed. The location of the spinodal associated with this demixing process is measured with pulse-induced critical light scattering. If the interaction potential is repulsive, crystallization is observed. The rate of formation of crystallites as a function of the concentration of the colloidal particles is studied by means of time-resolved light scattering.