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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Dynamics of Liquid-Liquid Phase Separation in Submicrometer Aerosol
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Dynamics of Liquid-Liquid Phase Separation in Submicrometer Aerosol

机译：液晶液中液液相分离动力学

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Nanoscale materials, when compared to their bulk components, possess unique properties. In particular, shifts in phase transitions can occur for submicrometer particles. For instance, small particles do not undergo the process of liquid-liquid phase separation (LLPS). LLPS has applications in emulsions such as Janus particles, controllable morphology to create drug-rich phases during drug delivery, and is often observed in atmospheric aqueous aerosol particles. In atmospheric particles, LLPS is tracked as a function of particle water activity, which is equivalent to the relative humidity (RH) at equilibrium. We probed three organic/inorganic aerosol systems in the range of RH over which phase separation occurs (SRH). Our findings indicate that SRH for submicrometer aerosol particles is lower than for micrometer-sized droplets. These findings show that it may be necessary to update the representation of phase transitions in aerosol particles in climate models. The vast majority of organic/inorganic aerosol particles have submicrometer diameters, and a decrease in SRH for submicrometer particles indicates that the current estimation of phase-separated aerosols may be overestimated. Furthermore, understanding the properties of LLPS at the nanoscale can provide key parameters to describe these systems and may lead to better control of phase separation in submicrometer particles.
机译：纳米材料与本体材料相比，具有独特的性能。特别是，亚微米颗粒的相变可能发生位移。例如，小颗粒不经历液-液相分离（LLPS）过程。LLPS在乳剂中有应用，如Janus颗粒，在药物输送过程中可控制形态以形成药物富集相，并且经常在大气水性气溶胶颗粒中观察到。在大气颗粒物中，LLP作为颗粒物水活度的函数进行跟踪，这相当于平衡时的相对湿度（RH）。我们探测了三种在相对湿度范围内发生相分离（SRH）的有机/无机气溶胶系统。我们的研究结果表明，亚微米气溶胶粒子的SRH低于微米大小的液滴。这些发现表明，可能有必要更新气候模型中气溶胶颗粒物相变的表示。绝大多数有机/无机气溶胶颗粒的直径为亚微米，亚微米颗粒的SRH降低表明，目前对相分离气溶胶的估计可能被高估。此外，了解纳米级LLP的性质可以提供描述这些系统的关键参数，并可能导致更好地控制亚微米颗粒的相分离。

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