Preparation characteristics of oil-in-water emulsions using differently charged surfactants in straight-through microchannel emulsification
Preparation characteristics of oil-in-water emulsions using differently charged surfactants in straight-through microchannel emulsification
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DOI：
10.1016/j.colsurfa.2003.08.005
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发表时间：
2003-11-24
影响因子：
5.2
通讯作者：
Mukataka, S
中科院分区：
文献类型：
--
作者：
Kobayashi, I;Nakajima, M;Mukataka, S
直通式微通道乳化是一种利用硅微机械加工孔阵列制备单分散乳液的新技术。本文研究了表面活性剂对直通式MC乳化行为的影响。在这项研究中使用的长方形直通MC的通道长度为48.7和9.6妈妈。使用阴离子和非离子表面活性剂，单分散大豆油在水（O/W）乳液的平均液滴直径为39妈妈和变异系数低于3%成功地制备。相反，含有阳离子表面活性剂的系统导致制备多分散的O/W乳液和在板表面上的分散相的完全润湿。对上述直通式MC乳化行为的分析表明，需要排斥性表面-板表面相互作用和高接触角值来实现成功的直通式MC乳化。分析还表明，在乳化过程中保持带负电荷的板表面亲水性是重要的。分散相流量影响直流式MC乳化行为。当使用阴离子和非离子表面活性剂时，随着分散相通量的增加，观察到尺寸稳定区、尺寸膨胀区和连续流出区。(C)2003 Elsevier B. V.保留所有权利。
Straight-through microchannel (MC) emulsification is a novel technique for producing monodisperse emulsions using a silicon array of micromachined through-holes, named a straight-through MC. This paper investigates the effect of surfactants on the straight-through MC emulsification behavior. The oblong straight-through MC used in this study had channel lengths of 48.7 and 9.6 mum. Using anionic and nonionic surfactants, monodisperse soybean oil-in-water (O/W) emulsions with average droplet diameters of 39 mum and coefficients of variation below 3% were successfully prepared. In contrast, the systems containing cationic surfactants resulted in the preparation of polydisperse O/W emulsions and complete wetting of the dispersed phase on the plate surface. An analysis of the above straight-through MC emulsification behavior revealed that a repulsive surfactant-plate surface interaction and a high contact angle value are required to achieve successful straight-through MC emulsification. Analysis also revealed that it is important to keep the negatively charged plate surface hydrophilic during the emulsification process. The dispersed-phase flux affected the straight-through MC emulsification behavior. A size-stable zone, a size-expanding zone, and a continuous outflow zone were observed with an increase in the dispersed-phase flux when using anionic and nonionic surfactants. (C) 2003 Elsevier B.V. All rights reserved.