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 non-vanishing 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.

中文翻译：

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周围溶液中的相关性诱导的活性颗粒的自运动性

当前的电泳传输模型依赖于分子力创建“扩散”的粒子-流体界面，我们在理论上研究了另一种机制，其中扩散界面仅是由于周围溶液的相关长度不变而出现的。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，预测的现象包括速度对活性的双线性依赖性，以及在改变相关长度时可能发生的双重速度反转。