Switchable surfactants

被引：755

作者：

Liu, Yingxin

Jessop, Philip G. ^{[1
]}

Cunningham, Michael

Eckert, Charles A.

Liotta, Charles L.

机构：

[1] Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada

[2] Queens Univ, Dept Chem Engn, Kingston, ON K7L 3N6, Canada

[3] Georgia Inst Technol, Sch Chem & Chem Engn, Atlanta, GA 30332 USA

来源：

SCIENCE | 2006年 / 313卷 / 5789期

关键词：

D O I：

10.1126/science.1128142

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Many industrial applications that rely on emulsions would benefit from an efficient, rapid method of breaking these emulsions at a specific desired stage. We report that long-chain alkyl amidine compounds can be reversibly transformed into charged surfactants by exposure to an atmosphere of carbon dioxide, thereby stabilizing water/alkane emulsions or, for the purpose of microsuspension polymerization, styrene-in-water emulsions. Bubbling nitrogen, argon, or air through the amidinium bicarbonate solutions at 65 degrees C reverses the reaction, releasing carbon dioxide and breaking the emulsion. We also find that the neutral amidines function as switchable demulsifiers of an aqueous crude oil emulsion, enhancing their practical potential.

引用

页码：958 / 960

页数：3

共 24 条

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