Oscillating phase separation in microemulsions. I. Experimental observation
Oscillating phase separation in microemulsions. I. Experimental observation
复制标题
微乳液中的振荡相分离。
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Vollmer
中科院分区：
文献类型：
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作者：
D. Vollmer;R. Strey;J. Vollmer
我们研究了油包水微乳液液滴的单一相向与富含水的过量相共存的较小水滴相的相分离。这种转变被发现振荡时，诱导的连续温度升高。在显微镜下和微量热计中观察到周期性的混浊和澄清，从而可以从透射光的消光和比热确定振荡周期。该周期取决于表面活性剂浓度，并随着扫描速度的平方根而增加。据作者所知，这是第一次观察到温度诱导的混合物相分离的振荡。
We examine the phase separation of a single phase of water-in-oil microemulsion droplets towards a phase of smaller water droplets coexisting with a water-rich excess phase. This transition is found to oscillate when induced by a continuous temperature increase. A periodic clouding and clearing is observed under the microscope and in the microcalorimeter, allowing to determine the oscillation period from the extinction of transmitted light and from the specific heat. The period depends on the surfactant concentration and increases as a square root of the scan speed. To the authors’ knowledge this is the first time that oscillations in a temperature induced phase separation of a mixture have been observed.