Behavior of Smart Surfactants in Stabilizing pH‐Responsive Emulsions,Angewandte Chemie International Edition

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Behavior of Smart Surfactants in Stabilizing pH‐Responsive Emulsions
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-11-30 , DOI: 10.1002/anie.202013443
Xiaomei Pei ₁ , Sheng Zhang ₁ , Wanqing Zhang ₁ , Pei Liu ₁ , Binglei Song ₁ , Jianzhong Jiang ₁ , Zhenggang Cui ₁ , Bernard P. Binks ₂

Affiliation

Newly structured pH‐responsive smart surfactants (N⁺‐(n)‐N, n=14, 16) from alkyl trimethylammonium bromides are reported. In neutral and alkaline media N⁺‐(n)‐N behaves as a normal cationic surfactant and stabilizes conventional emulsions alone, as well as Pickering emulsions and oil‐in‐dispersion emulsions together with oppositely and similarly charged nanoparticles, respectively. In acidic media N⁺‐(n)‐N becomes a hydrophilic Bola‐type surfactant, N⁺‐(n)‐NH⁺, and is an inferior emulsifier either when used alone or together with charged nanoparticles, resulting in demulsification. N⁺‐(n)‐NH⁺ returns to the aqueous phase alone or together with nanoparticles after demulsification without contaminating the oil phase, and the aqueous phase can be recycled when triggered by pH change. This protocol is a green process and leads to preparation of various temporarily stable emulsions which are often used in emulsion polymerization, heterogeneous catalysis, and oil transportation.

中文翻译：

智能表面活性剂在稳定pH响应型乳液中的行为

据报道，由烷基三甲基溴化铵构成的新型结构的pH响应型智能表面活性剂（N ⁺ -（n）-N，n = 14、16）。在中性和碱性介质中，N ⁺ -（n）-N表现为正常的阳离子表面活性剂，可单独稳定常规乳液，以及Pickering乳液和分散油乳液以及带相反电荷和相似电荷的纳米颗粒。在酸性介质中，N ⁺ -（n）-N变成亲水的Bola型表面活性剂N ⁺ -（n）-NH ⁺，当单独使用或与带电纳米粒子一起使用时，它是劣质乳化剂，导致破乳。N ⁺ -（n）-NH ⁺破乳后单独返回水相或与纳米颗粒一起返回水相，而不会污染油相，pH值变化触发水相可循环使用。该方案是绿色工艺，导致制备各种暂时稳定的乳液，这些乳液通常用于乳液聚合，多相催化和输油。

更新日期：2020-11-30

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