Stabilization of Water Droplets in an Oily Matrix Exclusively by Gel Formation

Stabilization of Water Droplets in an Oily Matrix Exclusively by Gel Formation
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仅通过凝胶形成来稳定油性基质中的水滴

DOI:
10.1002/ceat.201100574
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发表时间:
2012
影响因子:
2.1
通讯作者:
H.P. Schuchmann
H.P. Schuchmann
中科院分区:
工程技术4区
文献类型:
--
作者:
F. Wolf;F. Gmoser;H.P. Schuchmann

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由于乳状液中的液滴在热力学上是不稳定的,因此需要表面活性剂来稳定它们。然而,由于法律限制和可能的健康威胁,这些添加剂往往是不需要的。水相的凝胶化是一种很有希望的替代方法。到目前为止,只有像微流控装置这样的液滴形成过程才能成功地通过凝胶实现稳定。由于这些工艺很难放大,容易产生污染,研究了一种基于常用高压均质的技术方案。改装了喷嘴,在孔口出口的正后方增加了一个微型混合器。这允许在液滴分解后立即通过输送冷油流来凝胶化和稳定液滴。可以成功地稳定高达40 的索特平均直径到微米范围的液滴。
As droplets in emulsions are thermodynamically unstable, surfactants are required for their stabilization. However, these additives often are unwanted due to legal restrictions and possible health threats. Gelling of the aqueous phase poses one promising alternative. Only droplet‐forming processes like microfluidic devices are known to successfully work so far for stabilization by gelling. As these processes are hard to scale‐up and tend to foul, a technical alternative based on commonly used high‐pressure homogenization is investigated. A nozzle was adapted by adding a micromixer directly behind the orifice outlet. This allowed gelling and stabilizing the droplets by feeding a cold oil stream immediately after droplet breakup. Up to 40 wt‐% droplets with Sauter mean diameters down to the micrometer range could be successfully stabilized.
共流油包水系统中的液滴变形动力学和凝胶动力学。
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