摘要：The careful design and synthesis of CO2 stimulus-responsive surfactants are critical to the effective application of CO2-switchable emulsion for reducing the viscosity of heavy crude oil. In this study, a simple alternative method was proposed to construct CO2-responsive emulsions using a series of N, N-dimethylalkyl tertiary amines with different chain lengths as CO2-responsive agents, in combination with sodium dodecylbenzene sulfonate (SDBS) as emulsifiers. The stability, responsiveness, reversibility, demulsification performance and mechanism of emulsions formed with dodecane and crude oil respectively, were evaluated by interfacial tension, electrical conductivity, particle size, Zeta potential and H-1 NMR measurements. The results show that the incorporation of the amines enhanced emulsion stability by 10 similar to 20 %, with the crude oil-in-water emulsion exhibiting approximately three times greater stability than its dodecane-in-water counterpart. Remarkably, the emulsification of the crude oil resulted in a nearly 96.77 % reduction in viscosity. Moreover, the crude oil emulsions underwent rapid demulsification within minutes upon CO2 exposure. These distinctive properties underscore the strong potential of CO2-responsive surfactants for viscosity reduction in heavy oil applications.

关键字：Emulsion; Crude oil; CO2 responsiveness; Demulsification

ISSN号：0927-7757

卷、期、页：卷: 728子辑: 3

发表日期：2026-01-05

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,SCIE（科学引文索引网络版）

发表期刊名称：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

通讯作者：王洪勃,张洪生,张鹏,李琛

第一作者：张娟,杨钰龙

论文类型：期刊论文

论文概要：张娟,王洪勃,张洪生,张鹏,李琛,杨钰龙，Chain-length tunable tertiary amine/SDBS CO2-switchable emulsions for heavy oil viscosity reduction and rapid demulsification，COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS，2026，卷: 728子辑: 3

论文题目：Chain-length tunable tertiary amine/SDBS CO2-switchable emulsions for heavy oil viscosity reduction and rapid demulsification