Photochemical migration of liquid column in a glass tube
Photochemical migration of liquid column in a glass tube
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DOI：
10.1140/epjst/e2016-60217-y
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发表时间：
2017-04-01
影响因子：
2.8
通讯作者：
Motosuke, M.
中科院分区：
文献类型：
--
作者：
Muto, M.;Ayako, Y.;Motosuke, M.
在2.5-mm玻璃毛细管中通过光化学异构化证明了光诱导的液柱迁移。将表面活性剂AZTMA加入到超纯水中，在紫外光或可见光照射下发生异构化，导致液体的表面张力。通过利用该效应，通过将UV光照射到液体柱的一半部分来进行柱操作，使得在两个柱端的液-气界面具有对于光化学异构化不同的表面张力染料。结果，观察到由两端的拉普拉斯压力差产生的柱的迁移。柱首先根据其长度以恒定速度前进，然后通过柱中异构体的混合而减速。此外，发现柱长度越短，迁移率越高。这一特性被解释为粘性摩擦，它抵消了驱动力，和Marangoni对流在界面附近。
A light-induced migration of liquid columns in a 2.5-mm glass capillary by photochemical isomerization was demonstrated. The isomerization of a surfactant AZTMA, which was added into ultrapure water, occurred by irradiating UV or visible light and results in the surface tension of the liquid. By utilizing this effect, the column manipulation was performed by irradiating the UV light to a half portion of the liquid column so that liquid-gas interface at two column ends had different surface tension dye to the photochemical isomerization. As a result, the migration of the columns generated by a difference in the Laplace pressure at two ends was observed. The columns firstly advanced at constant speeds depending on their lengths and then decelerated by mixing of isomers in the columns. Moreover, it was found that shorter the column length, higher the mobility. This characteristic was explained by the viscous friction, which counteracted the driving force, and the Marangoni convection in the vicinity of the interface.