Fusion and clustering of spherical micelles by extruding through a cylindrical channel.
Fusion and clustering of spherical micelles by extruding through a cylindrical channel.
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通过圆柱形通道挤出球形胶束的融合和聚集
作者：
实验表明，通过圆柱形通道挤压球形胶束可以得到蠕虫状的圆柱形胶束。柱状约束的单轴对称有助于球形胶束融合成柱状相。本文提出了一个理论模型来研究这种由外压在圆柱形通道中驱动的聚变转变。在该模型中，双嵌段共聚物溶解在均聚溶剂中形成球形胶束。外压力由相邻球面胶束的平均中心距离控制。除了融合转变外，均聚物的加入还导致了相邻球形胶束之间的吸引力引起的耗尽效应。因此，通道中的球形胶束可以相互关联并形成线性团簇。通过自洽平均场理论的数值计算，研究了融合的自由能垒和球形胶束聚集的自由能势阱。我们提出了一个完整的相图，这些转变取决于通道的半径和外部压力。
Experiments have shown that worm-like cylindrical micelles can be obtained by extruding spherical micelles through a cylindrical channel. The uniaxial symmetry of the cylindrical confinement can help fuse the spherical micelles into the cylindrical phase. Here, a theoretical model is proposed to investigate this fusion transition driven by external pressure in the cylindrical channel. In this model, spherical micelles are formed by diblock copolymers dissolved in a homopolymer solvent. And the external pressure is controlled by the average center distance of the neighboring spherical micelles. In addition to the fusion transition, the addition of the homopolymers leads to a depletion effect induced by the attraction between adjacent spherical micelles. Thus, spherical micelles in the channel can correlate together and form a linear cluster. The free energy barrier of fusion and the free energy potential well of the clustering of spherical micelles are investigated by a numerical computation of the self-consistent mean field theory. We present a full phase diagram of these transitions depending on the radius of the channel and the external pressure.
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