典型有机-无机耦合体系中液液相分离对颗粒物吸湿特性的影响

颗粒物吸湿性是大气气溶胶的关键物理参量，颗粒物中有机组分相态的复杂性是制约我们准确理解和预测颗粒物吸湿过程的关键因素之一，液液相分离（LLPS）的出现进一步增加了该过程的复杂性。截至目前，我们对于LLPS如何影响颗粒物吸湿性及其规律仍缺乏全面而系统的认识，这也使我们难以基于模型准确预测颗粒物吸湿性的变化。因此，本研究拟利用光镊对单个颗粒物进行非接触式捕获，结合吸湿串联差分迁移分析仪，分别对15种有机物和2种常见无机物组成的有机-无机混合体系进行相态和吸湿过程的同步连续观测，并与3种模式在不同相态情境设定下的计算结果进行比对，以研究典型有机-无机耦合体系中LLPS对颗粒物吸湿性的影响及其潜在规律。

The hygroscopicity of particles is a key physico-chemical property of atmospheric aerosols. The complexity of phase state of organic aerosol is one of the key factors that limiting our accurate understanding and prediction of particle’s hygroscopicity, and liquid-liquid separation (LLPS) has further deepened the complexity of the process. Up to date, there is still lack of a comprehensive and systematic understanding in how LLPS affects the hygroscopicity of particles, which brought large uncertainties in hygroscopicity prediction models. In this study, we propose to use optical tweezer for contactless capture single particles, combined with a Hygroscopicity Tandem Differential Mobility Analyzer (HTDMA), to perform simultaneous and continuous measurement of phase separation and the hygroscopicity of different mixtures which selected from 15 organic and 2 inorganic species. The measured hygroscopicity will be compared with calculated results utilizing three different models under assumption of different phase scenarios, that including Zdanovskii-Stokes-Robinson (ZSR) mixing rule, Extended Aerosol Inorganics Model (E-AIM), and Aerosol Inorganic/Organic Mixtures Functional groups Activity Coefficients (AIOMFAC) model. Therefore, the effect of LLPS on the hygroscopicity of typical organic-inorganic coupling system and its potential patterns will be investigated.