Size dependent ultrafast cooling of water droplets in microemulsions by picosecond infrared spectroscopy.
Size dependent ultrafast cooling of water droplets in microemulsions by picosecond infrared spectroscopy.
复制标题
通过皮秒红外光谱对微乳液中的水滴进行尺寸依赖性超快冷却。
DOI：
10.1103/physrevlett.88.147402
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发表时间：
2002
影响因子：
8.6
通讯作者：
H. Graener
中科院分区：
文献类型：
--
作者：
G. Seifert;T. Patzlaff;H. Graener
利用时间分辨红外泵探光谱研究了正辛烷/AOT/水（AOT为二-2-乙基己基磺丁二酸钠）微乳中反胶束的超快热弛豫。这种皮秒冷却过程可以用热扩散来描述，展示了一种确定水滴纳米半径的新方法。反胶束在远高于平衡稳定性范围的瞬态温度下是稳定的。两亲界面层（AOT）似乎在水和非极性溶剂之间提供了有效的热接触。
The ultrafast thermal relaxation of reversed micelles in n-octane/AOT/water (where AOT denotes sodium di-2-ethylhexyl sulfosuccinate) microemulsions was investigated by time-resolved infrared pump-probe spectroscopy. This picosecond cooling process can be described in terms of heat diffusion, demonstrating a new method to determine the nanometer radii of the water droplets. The reverse micelles are stable against transient temperatures far above the equilibrium stability range. The amphiphilic interface layer (AOT) seems to provide an efficient heat contact between the water and the nonpolar solvent.