包封颗粒囊泡的临界溶胀
Critical swelling of particle-encapsulating vesicles
摘要：
我们考虑一个普遍存在的情况下，一个波动，半渗透性囊泡嵌入在溶液中，同时封闭固定数量的溶质颗粒。随着颗粒数量的增加或外部溶液浓度的降低，溶胀表现出从波动状态到最大体积构型的连续相变，由此建立起可观的压差和表面张力。这种临界性是包裹颗粒的囊泡所独有的，其体积和内部压力都会波动。这意味着这种囊泡在接近其极限体积和渗透溶解时具有普遍的溶胀行为。
英文摘要：
We consider a ubiquitous scenario where a fluctuating, semipermeable vesicle is embedded in solution while enclosing a fixed number of solute particles. The swelling with increasing number of particles or decreasing concentration of the outer solution exhibits a continuous phase transition from a fluctuating state to the maximum-volume configuration, whereupon appreciable pressure difference and surface tension build up. This criticality is unique to particle-encapsulating vesicles, whose volume and inner pressure both fluctuate. It implies a universal swelling behavior of such vesicles as they approach their limiting volume and osmotic lysis.
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