Lin Feilin, Jiang Jianzhong
The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, China.
The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, China.
Carbohydr Polym. 2024 Nov 1;343:122470. doi: 10.1016/j.carbpol.2024.122470. Epub 2024 Jul 8.
Emulsions have extensive applications in food, cosmetics, and agriculture, while the requirements for emulsions differ in various fields. It is a challenge for one emulsion to satisfy multiple requirements in different applications. Herein, CO-switchable emulsions with controllable stability and viscosity were prepared by a mixture of chitosans (CS) and CTAB. After adding low concentrations of CTAB (e.g. 0.5 mM), the viscous Pickering emulsions stabilized by CS alone were converted into moderate-viscous Pickering emulsions due to the competition adsorption between CS aggregates and CTAB at the oil-water interface. The transformation of emulsion types (such as Pickering and conventional emulsions) and the emulsion's stability and viscosity were controlled by CO/N trigger. Furthermore, at high CTAB concentrations (≥ 0.8 mM), a novel long-term stable conventional emulsion was obtained after the CS aggregates at the oil-water interface were entirely replaced by CTAB. Compared with other stimuli, CO is recognized as a green trigger that doesn't cause contaminations in the system, which has potential applications in organic synthesis and polymerization. Our strategy provides a simple and effective method to smartly control the properties of the emulsions (such as the emulsion type, stability, and viscosity), obtaining an intelligent emulsion to meet different requirements in many applications.
乳液在食品、化妆品和农业领域有着广泛应用，然而不同领域对乳液的要求各不相同。让一种乳液满足不同应用中的多种要求是一项挑战。在此，通过壳聚糖（CS）和十六烷基三甲基溴化铵（CTAB）的混合物制备了具有可控稳定性和粘度的CO-可切换乳液。加入低浓度的CTAB（如0.5 mM）后，由于CS聚集体与CTAB在油水界面的竞争吸附，仅由CS稳定的粘性Pickering乳液转变为中等粘度的Pickering乳液。乳液类型（如Pickering乳液和传统乳液）的转变以及乳液的稳定性和粘度由CO/N触发控制。此外，在高CTAB浓度（≥0.8 mM）下，油水界面处的CS聚集体被CTAB完全取代后，获得了一种新型的长期稳定的传统乳液。与其他刺激物相比，CO被认为是一种不会在系统中造成污染的绿色触发剂，在有机合成和聚合反应中具有潜在应用。我们的策略提供了一种简单有效的方法来巧妙地控制乳液的性质（如乳液类型、稳定性和粘度），从而获得一种智能乳液以满足许多应用中的不同要求。
