Three-body critical Casimir forces.
Three-body critical Casimir forces.
复制标题
三体临界卡西米尔力。
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Dietrich
中科院分区：
文献类型：
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作者：
Thiago de Mattos;Thiago de Mattos;Thiago de Mattos;L. Harnau;L. Harnau;S. Dietrich;S. Dietrich
在平均场理论中，我们计算了由三个平行的圆柱形胶体浸没在近临界二元液体混合物组成的系统的临界Casimir力的通用标度函数。对于几个几何排列和边界条件在表面的胶体，我们研究两个胶体粒子之间的力在垂直于其轴的方向，分析的存在下的第三个粒子上的力的影响。在改变温度或粒子的相对位置时，我们观察到有趣的特征，例如由第三个粒子的存在引起的力的符号的变化。我们通过从总力中减去成对力来确定作用在其中一个胶体上的力的三体分量。三体贡献的总临界卡西米尔力原来是更明显的小表面到表面之间的距离的胶体，以及接近临界的温度。此外，我们将我们的结果与其他物理系统，如三个原子通过货车范德华力相互作用的类似结果进行了比较。
Within mean-field theory we calculate universal scaling functions associated with critical Casimir forces for a system consisting of three parallel cylindrical colloids immersed in a near-critical binary liquid mixture. For several geometrical arrangements and boundary conditions at the surfaces of the colloids we study the force between two colloidal particles in the direction normal to their axes, analyzing the influence of the presence of a third particle on that force. Upon changing temperature or the relative positions of the particles we observe interesting features such as a change of sign of this force caused by the presence of the third particle. We determine the three-body component of the forces acting on one of the colloids by subtracting the pairwise forces from the total force. The three-body contribution to the total critical Casimir force turns out to be more pronounced for small surface-to-surface distances between the colloids as well as for temperatures close to criticality. Moreover, we compare our results with similar ones for other physical systems such as three atoms interacting via van der Waals forces.