CO2-responsive surfactants with tunable switching pH

Lu，Yi1; Sun，Dejun2; Ralston，John3; Liu，Qingxia1; Xu，Zhenghe1,4

2019-12-01

10.1016/j.jcis.2019.08.110

JOURNAL OF COLLOID AND INTERFACE SCIENCE   影响因子和分区

0021-9797

1095-7103

Hypothesis: One of the major challenges in applying CO-responsive surfactants concerns their tunable switchability and robustness under operating conditions. We hypothesize that combining monoethanolamine (MEA) with long-chain fatty acids (LCFAs) of variable chain lengths through electrostatic attraction could develop a series of CO-responsive surfactants with tunable switching pH. Experiments: The tunability of switching pH for this group of surfactants was demonstrated by in situ probing of the CO-responsive characteristics at the oil/water interface using dynamic interfacial tension (IFT) measurements. Two protocols were applied to distinguish interfacial response and solution response. The key importance of interfacial response was demonstrated by two essential applications of CO-responsive surfactants: demulsification of stable emulsions, and alternation of the interfacial properties of ultra-heavy crude oil-water interfaces. Findings: The switching pH of the CO-responsive surfactants was controlled by the hydrocarbon chain length of LCFAs. More importantly, their switching behaviour was found to be different at the interface and in the bulk solution, which is attributed to the enhanced molecular interactions at the interface. Since most applications require surfactants to be switched at the interface, it is thereby most appropriate to determine the switching pH through their interfacial responses.

CO2-responsive surfactants Demulsification Interfacial response Solution response Tunable switching pH Wettability alternation

SCI ; EI

英语

通讯

Leading Talents Program of Guangdong Province[K17253301]

Chemistry

Chemistry, Physical

WOS:000494056200020

ACADEMIC PRESS INC ELSEVIER SCIENCE

20193707430815

Carbon dioxide ; Chain length ; Crude oil ; Demulsification ; Ethanolamines ; Fatty acids ; Switching

Petroleum Deposits:512.1 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2

CHEMISTRY

2-s2.0-85072053680

Scopus

1.Department of Chemical and Materials EngineeringUniversity of Alberta,Edmonton,T6G 1H9,Canada
2.Key Laboratory of Colloid and Interface ChemistryShandong UniversityMinistry of Education,Jinan,250100,China
3.Future Industries InstituteUniversity of South Australia,Mawson Lakes,5095,Australia
4.Department of Materials Science and EngineeringSouthern University of Science and Technology,Shenzhen,518055,China

Lu，Yi,Sun，Dejun,Ralston，John,et al. CO2-responsive surfactants with tunable switching pH[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2019,557:185-195.

Lu，Yi,Sun，Dejun,Ralston，John,Liu，Qingxia,&Xu，Zhenghe.(2019).CO2-responsive surfactants with tunable switching pH.JOURNAL OF COLLOID AND INTERFACE SCIENCE,557,185-195.

Lu，Yi,et al."CO2-responsive surfactants with tunable switching pH".JOURNAL OF COLLOID AND INTERFACE SCIENCE 557(2019):185-195.