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Charge‐Reversible Surfactant‐Induced Transformation Between Oil‐in‐Dispersion Emulsions and Pickering Emulsions
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-03-19 , DOI: 10.1002/anie.202102098 Jianzhong Jiang 1 , Shijie Yu 2 , Wanqing Zhang 2 , Haojie Zhang 2 , Zhenggang Cui 2 , Wenshui Xia 3 , Bernard P. Binks 4
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-03-19 , DOI: 10.1002/anie.202102098 Jianzhong Jiang 1 , Shijie Yu 2 , Wanqing Zhang 2 , Haojie Zhang 2 , Zhenggang Cui 2 , Wenshui Xia 3 , Bernard P. Binks 4
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A novel charge‐reversible surfactant, (CH3)2N‐(CH2)10COONa, was designed and synthesized, which together with silica nanoparticles can stabilize a smart n‐octane‐in‐water emulsion responsive to pH. At high pH (9.3) the surfactant is anionic carboxylate, which together with the negatively charged silica nanoparticles co‐stabilize flowable oil‐in‐dispersion emulsions, whereas at low pH (4.1) it is turned to cationic form by forming amine salt which can hydrophobize in situ the negatively charged silica nanoparticles to stabilize viscous oil‐in‐water (O/W) Pickering emulsions. At neutral pH (7.5), however, this surfactant is converted to zwitterionic form, which only weakly hydrophobises the silica particles to stabilize O/W Pickering emulsions of large droplet size. Moreover, demulsification can be achieved rapidly triggered by pH. With this strategy particles can be controlled either dispersed in water or adsorbed at the oil‐water interface endowing emulsions with the capacity for intelligent and precise control of stability as well as viscosity and droplet size.
中文翻译：
电荷可逆表面活性剂在分散油乳液和Pickering乳液之间的转化
设计并合成了一种新型的电荷可逆表面活性剂（CH 3）2 N-（CH 2）10 COONa，该表面活性剂与二氧化硅纳米粒子一起可以稳定灵敏的n水辛烷值乳液，对pH值有响应。在高pH（9.3）下，表面活性剂是阴离子羧酸盐，它与带负电荷的二氧化硅纳米粒子共同稳定可流动的分散油乳液，而在低pH（4.1）下，它会通过形成胺盐而转变为阳离子形式。将带负电的二氧化硅纳米粒子原位疏水化以稳定粘性水包油（O / W）Pickering乳液。但是，在中性pH（7.5）下，该表面活性剂会转化为两性离子形式，这只会弱化疏水性二氧化硅颗粒，从而稳定大液滴尺寸的O / W Pickering乳液。而且，pH可以迅速触发破乳。
更新日期：2021-05-11
中文翻译：
电荷可逆表面活性剂在分散油乳液和Pickering乳液之间的转化
设计并合成了一种新型的电荷可逆表面活性剂（CH 3）2 N-（CH 2）10 COONa，该表面活性剂与二氧化硅纳米粒子一起可以稳定灵敏的n水辛烷值乳液，对pH值有响应。在高pH（9.3）下，表面活性剂是阴离子羧酸盐，它与带负电荷的二氧化硅纳米粒子共同稳定可流动的分散油乳液，而在低pH（4.1）下，它会通过形成胺盐而转变为阳离子形式。将带负电的二氧化硅纳米粒子原位疏水化以稳定粘性水包油（O / W）Pickering乳液。但是，在中性pH（7.5）下，该表面活性剂会转化为两性离子形式，这只会弱化疏水性二氧化硅颗粒，从而稳定大液滴尺寸的O / W Pickering乳液。而且，pH可以迅速触发破乳。
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