论文标题
二元溶剂在加热胶体颗粒周围的非平衡动力学
Non-equilibrium dynamics of a binary solvent around heated colloidal particles
论文作者
论文摘要
使用数值模拟，我们研究了在温度梯度的存在下，在球形胶体周围二元溶剂的非平衡性粗化动力学。通过求解耦合的修饰的Cahn-Hilliard-cook方程和热扩散方程，研究了温度淬火后的粗化动力学，该方程分别描述了浓度曲线和温度场。对于温度场，我们应用合适的边界条件。我们观察到胶体周围不同相的圆形层的形成，而远离旋律分解的胶体模式持续存在。此外，我们研究了模式形成对淬火温度的依赖性。我们的仿真模拟了一个实验系统，其中胶体通过激光照明加热。请注意，我们查看溶剂在临界温度上的冷却，而实验类似物是临界温度较低的溶剂的激光加热。我们还研究了两个胶体系统。在这里，我们观察到连接两个胶体的一个相的桥。此外，我们研究作用于化学势梯度产生的胶体上的力。
Using numerical simulations, we study the non-equilibrium coarsening dynamics of a binary solvent around spherical colloids in the presence of a temperature gradient. The coarsening dynamics following a temperature quench is studied by solving the coupled modified Cahn-Hilliard-Cook equation and the heat diffusion equation, which describe the concentration profile and the temperature field, respectively. For the temperature field we apply a suitable boundary condition. We observe the formation of circular layers of different phases around the colloid whereas away from the colloid patterns of spinodal decomposition persist. Additionally, we investigate the dependence of the pattern formation on the quench temperature. Our simulation mimics an experimental system where the colloid is heated by laser illumination. Note that we look at the cooling of a solvent with an upper critical temperature, whereas the experimental analogue is the laser-heating of a solvent with a lower critical temperature. We also study a two colloid system. Here, we observe that a bridge of one phase forms connecting the two colloids. Also, we study the force acting on the colloids that is generated by the chemical potential gradient.
