Domínguez Alvaro, Popescu M N, Rohwer C M, Dietrich S
Física Teórica, Universidad de Sevilla, Apdo. 1065, 41080 Sevilla, Spain.
Instituto Carlos I de Física Teórica y Computacional, 18071 Granada, Spain.
Phys Rev Lett. 2020 Dec 31;125(26):268002. doi: 10.1103/PhysRevLett.125.268002.
Current models of phoretic transport rely on molecular forces creating a "diffuse" particle-fluid interface. We investigate theoretically an alternative mechanism, in which a diffuse interface emerges solely due to a nonvanishing correlation length of the surrounding solution. This mechanism can drive self-motility of a chemically active particle. Numerical estimates indicate that the velocity can reach micrometers per second. The predicted phenomenology includes a bilinear dependence of the velocity on the activity and a possible double velocity reversal upon varying the correlation length.
当前的携播传输模型依赖于分子力来创建一个“扩散”的粒子 - 流体界面。我们从理论上研究了一种替代机制，在这种机制中，扩散界面仅由于周围溶液的非零关联长度而出现。这种机制可以驱动化学活性粒子的自运动。数值估计表明，速度可以达到每秒微米量级。预测的现象学包括速度与活性的双线性依赖关系，以及在改变关联长度时可能出现的双速度反转。
