利用疏水的聚四氟乙烯为基底,在其表面得到球形的硫酸镁液滴.利用微区拉曼技术,实现了在硫酸镁液滴表面和球心两次聚焦,由此获得了来自表面和内部组成不同的拉曼信号,初步认定MgSO4液滴形成的胶态结构为具有一定厚度的膜状结构.这种膜状结构覆盖在液滴表面,阻碍液滴内部水分蒸发,导致MgSO4液滴表面和内部的结构差异. Using hydrophobic polytetrafluoroethylene as a substrate, a spherical magnesium sulfate droplet was obtained on the surface of the magnesium sulfate droplet. Using the Raman microscopy technique, focusing on the surface of the magnesium sulfate droplet and the center of the sphere was achieved twice, The internal composition of different Raman signals, initially identified MgSO4 droplets formed colloidal structure with a certain thickness of the film-like structure.This film-like structure covers the surface of the droplets, hinder the evaporation of water droplets inside, resulting in MgSO4 droplets surface And internal structural differences.