We study the configuration behaviors of non-spherical lens-shaped particles at a fluid-fluid interface. The attachment energies of truncated spheres and biconvex particles are calculated numerically to determine the thermodynamically stable configuration of the particles at the interface. When the particle is rotated 180° perpendicular to the interface, two energy minima are observed in the attachment energy profile. One corresponds to equilibrium and the other to a metastable orientation. The high energy barrier between the two energy minima indicates that the particle with the metastable condition is not spontaneously converted to the equilibrium state, such that the interface adsorption and orientation behaviors of the particles are irreversible and are determined stochastically. A further comprehensive investigation of the interfacial pinning phenomena of the truncated or biconvex boundary and free-rotation of the particles is also performed for different wettability and geometric factors. This study offers simple design rules for the synthesis of anisotropic particles used as a solid surfactant.

我们研究了非球面透镜形颗粒在流体-流体界面的配置行为。截断的球体和双凸粒子的附着能通过数值计算，以确定粒子在界面处的热力学稳定构型。当粒子垂直于界面旋转180°时，在附着能谱中观察到两个最小的能量。一个对应于平衡，另一个对应于亚稳取向。两种能量极小值之间的高能垒表明具有亚稳态条件的颗粒不会自发转化为平衡状态，因此颗粒的界面吸附和取向行为是不可逆的，并且是随机确定的。对于不同的润湿性和几何因素，还对截断或双凸边界的界面钉扎现象以及颗粒的自由旋转进行了进一步的综合研究。这项研究为合成用作固体表面活性剂的各向异性颗粒提供了简单的设计规则。