丁二酸钠气溶胶液滴吸湿性的分子谱学研究

Molecular Spectral Investigations on the Hygroscopicity of Aerosols of Sodium Succinate

采用共聚焦拉曼光谱和傅里叶变换红外-衰减全反射(FTIR-ATR)技术,研究了丁二酸钠气溶胶液滴的风化和潮解过程.研究发现,随着水质摩尔比的降低,1420cm-1处νs(COO-)的半峰宽由35cm-1增加至42cm-1,表明过饱和丁二酸钠液滴内部Na+与丁二酸根存在弱相互作用;过饱和丁二酸钠液滴风化形成亚稳态无水晶体,而不是形成热力学更稳定的六水合晶体.

The efflorescence and deliquescence processes of sodium succinate aerosol droplets were investigated with combination of confocal Raman spectral and FTIR-ATR techniques.It was concluded that the full width at half maximum（FWHM） of νs（COO-） band of sodium succinate droplet at 1420 cm-1 increased from 35 cm-1 to 42 cm-1 with decreasing the molar ratio of water to solute（WSR）,indicating the weak interaction between Na ＋ and succinate dianions;the sodium succinate droplet crystallized to form metastable anhydrous particles rather than thermodynamically stable hexahydrated ones.