论文标题
被困在二元液体混合物的复合液体蒸气界面上的胶体颗粒的润湿行为
Wetting behavior of a colloidal particle trapped at a composite liquid-vapor interface of a binary liquid mixture
论文作者
论文摘要
由A和B颗粒组成的部分混溶的二元液体混合物在理论上被认为是稳定的富含A的液相与蒸气相处于热平衡状态。富含B的液体是亚稳态的。选择了液体和热力学条件，使富含A的液体和蒸气之间的界面包含富含B相的润湿膜。为了获得有关胶体颗粒周围大尺度流体结构的信息，该胶体颗粒被困在这种复合液体蒸气界面，在平面液体蒸气，壁液和壁蒸气接口的三个相关和连接的润湿现象中，使用经典密度的理论分析地研究了与Sharp-knimimation norkimimimation nordimimimation norkimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimimime norkimimimimimimimightime。如果根据所谓的混合规则，A-B相互作用的强度由A-A和B-B相互作用的强度的几何平均值给出，并且类似地，Wall-A和Wall-B相互作用之间的比率，则可以排除胶体的胶体胶体，即B-Rich液体的膜包含胶体，则可以排除。如果上述液体壁和流体 - 流体相互作用的混合规则放松，则最多可以进行六种不同的润湿场景。系统参数的空间被分为与六个方案相对应的域，以及哪个域实际显示，取决于与混合规则处方的偏差的符号。相关域出现，如果与混合规则处方相比，壁-A强度与壁-B相互作用的强度之间的比率降低，或者A-B相互作用的强度增加到混合规则处方的值以上的值以上。还研究了在各个域内可能在其中的接触角可能变化的范围。
A partially miscible binary liquid mixture, composed of A and B particles, is considered theoretically under conditions for which a stable A-rich liquid phase is in thermal equilibrium with the vapor phase. The B-rich liquid is metastable. The liquids and the thermodynamic conditions are chosen such, that the interface between the A-rich liquid and the vapor contains an intervening wetting film of the B-rich phase. In order to obtain information about the large-scale fluid structure around a colloidal particle, which is trapped at such a composite liquid-vapor interface, three related and linked wetting phenomena at planar liquid-vapor, wall-liquid, and wall-vapor interfaces are studied analytically, using classical density functional theory in conjunction with the sharp-kink approximation for the number density profiles of the A and B particles. If in accordance with the so-called mixing rule the strength of the A-B interaction is given by the geometric mean of the strengths of the A-A and B-B interactions, and similarly the ratio between the wall-A and the wall-B interaction, the scenario, in which the colloid is enclosed by a film of the B-rich liquid, can be excluded. Up to six distinct wetting scenarios are possible, if the above mixing rules for the fluid-wall and for the fluid-fluid interactions are relaxed. The way the space of system parameters is divided into domains corresponding to the six scenarios, and which of the domains actually appear, depends on the signs of the deviations from the mixing rule prescriptions. Relevant domains emerge, if the ratio between the strengths of the wall-A and the wall-B interactions is reduced as compared to the mixing rule prescription, or if the strength of the A-B interaction is increased to values above the one from the mixing rule prescription. The range, within which the contact angle may vary inside the various domains, is also studied.
