论文标题
二元胶体中的分级分级和相分离
Synchronized Fractionation and Phase Separation in Binary Colloids
论文作者
论文摘要
分馏对于多组分混合物中的自组装是必需的。在这里，在二维二元胶体中实现和研究了可逆分离和结晶，该胶体通过增强胶体颗粒之间的吸引力而过饱和。由于深而快速的过度过饱和导致凝胶具有均匀分布的二进制颗粒，因此逐渐的绝对过度过饱和过程导致两步结晶，其中小颗粒和大颗粒分别以共存的晶体和液相相位分配。分馏也在凝胶的过度熔化中也会发生。我们表明，同步分级和相位分离是由大小相关的排斥和可调吸引力之间的竞争产生的。这项研究的结果证明了通过相分离的鲁棒分馏机制，并且对了解活细胞中无膜细胞器的可逆形成具有重要意义。
Fractionation is necessary for self-assembly in multicomponent mixtures. Here, reversible fractionation and crystallization are realized and studied in a two-dimensional binary colloids which is supersaturated by enhancing the attraction between colloidal particles. As a deep and fast supersaturation results in gels with a uniform distribution of binary particles, a gradual quasistatic supersaturating process leads to a two-step crystallization in which small particles and large particles are fractionated as coexisting crystal and liquid phases respectively. Fractionation occurs as well in the quasistatic melting of gel. We show that the synchronized fractionation and phase separation arises from the competition between the size-dependent repulsion and the tunable attraction. The results in this study demonstrate a robust mechanism of fractionation via phase separation, and have important implication in understanding the reversible formation of membraneless organelles in living cells.
