Langmuir单分子膜在海洋飞沫气溶胶表面特性研究中的应用  

Application of Langmuir Monolayers in the Investigation of Surface Properties of Sea Spray Aerosols

作　　者：程淑敏 杜林 张秀辉 葛茂发[3] Shumin Cheng;Lin Du;Xiuhui Zhang;Maofa Ge(Environment Research Institute,Shandong University,Qingdao 266237,China;Key Laboratory of Cluster Science,Ministry of Education of China,School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China;State Key Laboratory for Structural Chemistry of Unstable and Stable Species,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]山东大学环境研究院,青岛266237 [2]北京理工大学化学与化工学院原子分子簇科学教育部重点实验室,北京100081 [3]中国科学院化学研究所分子动态与稳态结构国家重点实验室,北京100090

出　　处：《化学进展》2021年第10期1721-1730,共10页Progress in Chemistry

基　　金：国家自然科学基金项目(No.21876098,91644214)资助。

摘　　要：被表面活性有机物包裹的液相气溶胶,如海洋飞沫气溶胶(SSA),通常具有反胶束的结构,它由有机分子形成的疏水表面和一个水相内核构成。SSA界面有机膜的组分和形态对其物理、化学和光学特性有重要的影响。Langmuir单分子膜是由脂肪酸、脂肪醇和磷脂等具有低挥发性的长链表面活性有机物在空气-水界面上扩散形成的单层分子薄膜。采用Langmuir槽可以测定水-气界面的单组分或复合组分单分子膜的表面压随分子面积变化的曲线(π-A曲线),从而揭示相应单分子膜的界面特性,进而预测表面活性剂在实际SSA中的命运和行为。本文综述了常用大气气溶胶界面表征技术、基于单分子膜建立的SSA模型以及有机膜对SSA大气行为的影响。虽然目前对SSA相关单分子膜的物理性质和形貌变化已有深入的研究,但是对于反应性气体、光照和生物活性物质等环境因素引起的界面变化却很少有关注,本文为未来的实验室模拟和模式研究提供了新的思路。Aqueous aerosols coated by surface-active organics,such as sea spray aerosol(SSA),commonly possess inverse micelle structure with an aqueous core coated by a hydrophobic organic monolayer.The surface organization and chemical composition of organic films of SSAs have important influence on their physical,chemical and optical properties.Langmuir monolayers are monomolecular layers formed by the diffusion of long-chain surface-active organics with low volatility,such as fatty acids,fatty alcohols and phospholipids at the air-water interface.With Langmuir trough,the changes in surface pressure(π)along with decreasing molecular area(A)of single and mixed component monolayers at the air-water interface can be obtained.In addition,π-A isotherms provide information about the interfacial behavior of corresponding monolayers above an aqueous surface.Understanding the interfacial properties of monolayers will enable the prediction of the fate and behaviors of surfactants in the real-world SSA.This paper reviews the commonly used interfacial characterization techniques of atmospheric aerosols,established models for SSA based on Langmuir monolayer,and the implications of organic films on atmospheric behavior of SSA.Although the physical properties and morphological changes of SSA-related monolayers have been studied in depth,little attention has been paid to the interfacial changes induced by environmental factors such as reactive gases,irradiation and bioactive substances.These knowledge gaps shed light on future laboratory simulation and model research of SSA.

关 键 词：单分子膜 海洋飞沫气溶胶 表面特性 气-液界面 大气行为 

分 类 号：X131.1[环境科学与工程—环境科学]