Dispersed colloidal particles that are set into systematic motion by a controlled external field constitute excellent model systems for studying structure formation far from equilibrium. Here we identify a unique demixing force that arises from repulsive interparticle interactions in driven binary colloids. The corresponding demixing force density is resolved in space and in time and it counteracts diffusive currents which arise due to gradients of the local mixing entropy. We construct a power functional approximation for overdamped Brownian dynamics that describes superadiabatic demixing as an antagonist to adiabatic mixing as originates from the free energy. We apply the theory to colloidal lane formation. The theoretical results are in excellent agreement with our Brownian dynamics computer simulation results for adiabatic, structural, drag and viscous forces. Superadiabatic demixing allows to rationalize the emergence of mixed, laned and jammed states in the system.

分散的胶体颗粒通过受控的外部场进入系统运动，构成了用于研究远离平衡的结构形成的出色模型系统。在这里，我们确定了独特的混合力，该混合力是由驱动的二元胶体中的排斥性粒子间相互作用引起的。相应的混合力密度在空间和时间上得到解决，并且抵消了由于局部混合熵的梯度而产生的扩散电流。我们为过阻尼的布朗动力学构造了幂函数近似，该动力学描述了超级绝热混合作为绝热混合的拮抗剂，因为绝热混合源自自由能。我们将该理论应用于胶体泳道的形成。理论结果与我们的布朗动力学计算机模拟结果绝热，结构，阻力和粘性力。超绝热混合可以合理化系统中混合，车道和卡塞状态的出现。