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

Abstract

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

CLC Number:

TQ423

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.

Figures/Tables 5

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

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

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