基于十四烷基二乙烯三胺的CO2响应性Pickering乳液的稳定性能研究

doi:10.3969/j.issn.1001-1803.2020.12.005

摘要/Abstract

摘要：

以正癸烷为油相,纳米SiO₂和十四烷基二乙烯三胺（C₁₄DETA）为乳化剂,制备了CO₂响应性O/W型Pickering乳状液。交替通入CO₂和N₂,该乳状液在25 ℃下实现了“开（稳定）”和“关（不稳定）”之间的多次转换。通入CO₂时,C₁₄DETA质子化成C₁₄DETA-CO₂,通过静电作用吸附至带负电的SiO₂颗粒表面,产生原位疏水作用,使其转变为表面活性颗粒,从而稳定乳状液;通入N₂时,C₁₄DETA-CO₂去质子化为C₁₄DETA,原位疏水作用解除,导致乳状液完全破乳。通过研究确定乳化的较佳条件：油水体积比为1:1,纳米SiO₂的质量分数为0.05%,C₁₄DETA-CO₂浓度为2×10^-3 mol/L。与C₁₄DETA稳定的乳状液对比,Pickering乳状液中表面活性剂使用量更少,稳定性更强。

关键词: 纳米SiO₂, 十四烷基二乙烯三胺, CO₂响应性Pickering乳状液, 乳化性能

Abstract:

The CO₂-triggered O/W Pickering emulsion was prepared with SiO₂ nanoparticles and tetradecyldiethylenetriamine （C₁₄DETA） as emulsifiers and n-decane as oil phase. At 25 ℃, the emulsion could be smartly switched “on （stable）” and “off （unstable）” by bubbling CO₂ and N₂ alternately. C₁₄DETA was protonated into C₁₄DETA-CO₂ by bubbling CO₂, and then adsorbed to the surface of negatively charged SiO₂ particles through electrostatic interaction, resulting in in-situ hydrophobic effect and transforming SiO₂ particles into surface-active particles and thus stabilizing the emulsion. However, C₁₄DETA-CO₂ was deprotonated into C₁₄DETA by bubbling N₂, which induced the elimination of in-situ hydrophobic effect, thus leading to complete demulsification of the emulsion. The emulsifying conditions were optimized: the volume ratio of oil/water was 1:1; the mass fraction of SiO₂ particles was 0.05% and the concentration of C₁₄DETA-CO₂ was 2×10^-3 mol/L. The Pickering emulsion needed less surfactant and had stronger stability than the emulsion with C₁₄DETA as the surfactant.

Key words: nano-SiO₂, tetradecyldiethylenetriamine, CO₂-triggered Pickering emulsion, emulsifying property

中图分类号:

TQ423

冯晓君,张鹏,李蕊蕊,赖璐. 基于十四烷基二乙烯三胺的CO₂响应性Pickering乳液的稳定性能研究[J]. 日用化学工业, 2020, 50(12): 842-847.

FENG Xiao-jun,ZHANG Peng,LI Rui-rui,LAI Lu. A study on the stability of CO₂-triggered Pickering emulsion based on tetradecyldiethylenetriamine[J]. China Surfactant Detergent & Cosmetics, 2020, 50(12): 842-847.

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基于十四烷基二乙烯三胺的CO₂响应性Pickering乳液的稳定性能研究

A study on the stability of CO₂-triggered Pickering emulsion based on tetradecyldiethylenetriamine

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