Active Brownian equation of state: metastability and phase coexistence,Soft Matter

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Active Brownian equation of state: metastability and phase coexistence
Soft Matter ( IF 2.9 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1039/c7sm01504f
Demian Levis _{1,

2,

3,

4,

5} , Joan Codina _{1,

2,

3,

4,

5} , Ignacio Pagonabarraga _{1,

2,

3,

4,

5}

Affiliation

As a result of the competition between self-propulsion and excluded volume interactions, purely repulsive self-propelled spherical particles undergo a motility-induced phase separation (MIPS). We carry out a systematic computational study, considering several interaction potentials, systems confined by hard walls or with periodic boundary conditions, and different initial conditions. This approach allows us to identify that, despite its non-equilibrium nature, the equations of state of Active Brownian Particles (ABP) across MIPS verify the characteristic properties of first-order liquid–gas phase transitions, meaning, equality of pressure of the coexisting phases once a nucleation barrier has been overcome and, in the opposite case, hysteresis around the transition as long as the system remains in the metastable region. Our results show that the equations of state of ABPs account for their phase behaviour, providing a firm basis to describe MIPS as an equilibrium-like phase transition.

中文翻译：

有源布朗状态方程：亚稳定性和相位共存

由于自推进和排除的体积相互作用之间的竞争，纯排斥的自推进球形颗粒经历了运动诱导的相分离（MIPS）。我们进行了系统的计算研究，考虑了多个相互作用势，由硬壁限制的或具有周期性边界条件的系统以及不同的初始条件。这种方法使我们能够确定，尽管具有非平衡性质，但跨MIPS的活性布朗粒子（ABP）的状态方程可验证一阶液相-气相转变的特征，即共存压力相等相变一旦克服了成核壁垒，并且在相反的情况下，只要系统保持在亚稳态区域，相变周围就会出现滞后。

更新日期：2017-11-15

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