Micro-Raman investisations on the structures of the surface and the inner of MgSO4 droplets

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2008,（15）
• 页码范围: 2414-2416
• 页数: 3页
• 语种: 英文
• DOI: 10.1007/s11434-008-0329-y

摘要

Spherical MgSO4 droplets were deposited by a syringe on the hydrophobic Teflon substrate. Using micro-Raman technique, the laser beam was highly focused twice on the surface and in the center of spherical droplets. The Raman spectra for the surface and the inner of MgSO4 droplets were accordingly obtained, suggesting formation of a thin layer of gels on MgSO4 droplets at low relative humidity. The gel layer covered the surface and exhibited a significant delay in response to the change of ambient relative humidity, resulting in the structural difference between the surface and the inner of MgSO4 droplets.