Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart, Germany.
J Chem Phys. 2012 Jun 14;136(22):224902. doi: 10.1063/1.4722883.
We study the phase behavior of colloidal suspensions the solvents of which are considered to be binary liquid mixtures undergoing phase segregation. We focus on the thermodynamic region close to the critical point of the accompanying miscibility gap. There, due to the colloidal particles acting as cavities in the critical medium, the spatial confinements of the critical fluctuations of the corresponding order parameter result in the effective, so-called critical Casimir forces between the colloids. Employing an approach in terms of effective, one-component colloidal systems, we explore the possibility of phase coexistence between two phases of colloidal suspensions, one being rich and the other being poor in colloidal particles. The reliability of this effective approach is discussed.
我们研究了胶体悬浮液的相行为，其中溶剂被认为是经历相分离的二元液体混合物。我们专注于接近伴随的混溶性间隙的临界点的热力学区域。在那里，由于胶体颗粒在临界介质中充当空穴，相应序参量的临界涨落的空间限制导致胶体之间产生有效的、所谓的临界 Casimir 力。我们采用有效单组分胶体系统的方法，探索了富含胶体颗粒的一相和贫胶体颗粒的另一相之间的相共存的可能性。讨论了这种有效方法的可靠性。
