CO2-Controllable Foaming and Emulsification Properties of the Stearic Acid Soap Systems.
CO2-Controllable Foaming and Emulsification Properties of the Stearic Acid Soap Systems.
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DOI：
10.1021/acs.langmuir.5b01295
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
Wenlong Xu;Hong Gu;Xionglu Zhu;Yingping Zhong;Liwen Jiang;Mengxin Xu;Aixin Song;J. Hao
中科院分区：
文献类型：
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作者：
Wenlong Xu;Hong Gu;Xionglu Zhu;Yingping Zhong;Liwen Jiang;Mengxin Xu;Aixin Song;J. Hao
脂肪酸作为硬脂酸的典型例子，是一种廉价的表面活性剂，具有重要的应用。工业应用的挑战性问题是它们的溶解度。在此，使用三种有机胺——乙醇胺（EA）、二乙醇胺（DEA）和三乙醇胺（TEA）——作为抗衡离子来增加硬脂酸的溶解度，并系统地研究了相行为。相图分别在 25 和 50 °C 下绘制。通过差示扫描量热法（DSC）测量相变温度，通过低温透射电子显微镜（cryo-TEM）观察观察到微结构为囊泡和平面片。样品的表观粘度通过流变特性测定。三个系统的rcmc 值均小于30 mN·m(-1)。研究了用作发泡剂和乳化剂的典型双层样品的发泡和乳化测定。引入CO2改变硬脂酸的溶解度，诱导其表面活性转变，进一步达到消泡破乳的目的。
Fatty acids, as a typical example of stearic acid, are a kind of cheap surfactant and have important applications. The challenging problem of industrial applications is their solubility. Herein, three organic amines-ethanolamine (EA), diethanolamine (DEA), and triethanolamine (TEA)-were used as counterions to increase the solubility of stearic acid, and the phase behaviors were investigated systematically. The phase diagrams were delineated at 25 and 50 °C, respectively. The phase-transition temperature was measured by differential scanning calorimetry (DSC) measurements, and the microstructures were vesicles and planar sheets observed by cryogenic transmission electron microscopy (cryo-TEM) observations. The apparent viscosity of the samples was determined by rheological characterizations. The values, rcmc, for the three systems were less than 30 mN·m(-1). Typical samples of bilayers used as foaming agents and emulsifiers were investigated for the foaming and emulsification assays. CO2 was introduced to change the solubility of stearic acid, inducing the transition of their surface activity and further achieving the goal of defoaming and demulsification.