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Fusion and clustering of spherical micelles by extruding through a cylindrical channel

机译：通过圆柱形通道挤出使球形胶束融合并聚集

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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.
机译：实验表明，通过将球形胶束挤出圆柱形通道可以得到蠕虫状的圆柱形胶束。圆柱限制的单轴对称性可以帮助将球形胶束融合到圆柱相中。在这里，提出了一个理论模型来研究由圆柱形通道中的外部压力驱动的这种融合转变。在该模型中，球形胶束是由溶于均聚物溶剂中的二嵌段共聚物形成的。并且外部压力由相邻球形胶束的平均中心距离控制。除了熔融转变以外，均聚物的添加还导致由相邻球形胶束之间的吸引引起的耗尽效应。因此，通道中的球形胶束可以相互关联并形成线性簇。通过自洽平均场理论的数值计算，研究了聚变的自由能垒和球形胶束团簇的自由能势阱。我们根据通道的半径和外部压力给出了这些过渡的完整相位图。

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