Molecular structure-tuned stability and switchability of CO2-responsive oil-in-water emulsions

Liu，Lingfei1; Zhang，Mingshan2; Lu，Zhouguang1; Jin，Zhehui2; Lu，Yi3; Sun，Dejun4; Xu，Zhenghe1

2022-12-01

10.1016/j.jcis.2022.07.005

JOURNAL OF COLLOID AND INTERFACE SCIENCE   Impact Factor & Quartile

0021-9797

1095-7103

Hypothesis: Pseudo-Gemini surfactants (PGS) possessing switchable and recyclable features have drawn increasing attention on generating high-performance CO-responsive emulsions for wide range and versatile applications. However, there is a lack of fundamental understanding on how the molecular structure of PGS affects the stability and switchability of emulsions. We hypothesize that the length and type of the spacer in PGS play a decisive role in controlling interfacial and switching properties. Experiments: Two series of PGS with different spacers were prepared through electrostatic association between amines and oleic acid. The interfacial activity and CO-responsive properties of corresponding emulsions were systematically investigated by well-designed experiments and molecular dynamics simulations. Findings: Increasing the spacer length to allow the bent configuration leads to more tight arrangement of oleic molecules, consequently improving the interfacial activity. In addition, the introduction of amino group into the spacer dramatically promotes CO response of resulting PGS due to ehanced migration of the spacer from the interface to the aqueous phase after CO addition. These results are inspiring in designing controllable CO-responsive emulsions for a wide range of industrial applications (e.g., enhanced oil recovery and oil-contaminated soil remediation).

CO2-responsive emulsion Molecular dynamics simulation Pseudo-Gemini surfactant Spacer length and structure

EI ; SCI

English

First

Natural Sciences and Engineering Research Council of Canada[2017-05080];National Natural Science Foundation of China[21938003];National Natural Science Foundation of China[51974162];

Chemistry

Chemistry, Physical

WOS:000888437600013

ACADEMIC PRESS INC ELSEVIER SCIENCE

20223012405182

Amines ; Carbon dioxide ; Emulsification ; Enhanced recovery ; Molecular structure ; Ostwald ripening ; Remediation ; Soil conservation ; Soil pollution ; Soils ; Surface active agents

Environmental Impact and Protection:454.2 ; Soils and Soil Mechanics:483.1 ; Oil Field Production Operations:511.1 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Atomic and Molecular Physics:931.3

CHEMISTRY

2-s2.0-85134559013

Scopus

1.Department of Materials Science and Engineering,Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Mining and Petroleum Engineering,Department of Civil and Environmental Engineering,University of Alberta,Edmonton,T6G 1H9,Canada
3.Bioproducts Institute,Department of Chemical and Biological Engineering,Department of Chemistry and Department of Wood Science,University of British Columbia,Vancouver,V6T 1Z3,Canada
4.Key Laboratory of Colloid and Interface Chemistry,Shandong University,Ministry of Education,Jinan,Jinan,250100,China

Liu，Lingfei,Zhang，Mingshan,Lu，Zhouguang,et al. Molecular structure-tuned stability and switchability of CO2-responsive oil-in-water emulsions[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2022,627:661-670.

Liu，Lingfei.,Zhang，Mingshan.,Lu，Zhouguang.,Jin，Zhehui.,Lu，Yi.,...&Xu，Zhenghe.(2022).Molecular structure-tuned stability and switchability of CO2-responsive oil-in-water emulsions.JOURNAL OF COLLOID AND INTERFACE SCIENCE,627,661-670.

Liu，Lingfei,et al."Molecular structure-tuned stability and switchability of CO2-responsive oil-in-water emulsions".JOURNAL OF COLLOID AND INTERFACE SCIENCE 627(2022):661-670.