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论文类型：期刊论文
发表时间：2014-05-01
发表刊物：JOURNAL OF SURFACTANTS AND DETERGENTS
收录刊物：SCIE、EI
卷号：17
期号：3
页面范围：383-390
ISSN号：1097-3958
关键字：Switchable surfactants; CO2; N-Alkylimidazole; Emulsification
摘要：In order to overcome the hydrolysis of 2-alkyl-1-hydroxyethyl imidazoline and its unsatisfactory emulsification-demulsification switchability to water-alkane, the long-chain N-alkylimidazole compounds were synthesized by n-octyl bromide, n-decyl bromide, n-dodecyl bromide, n-tetradecyl bromide and n-hexadecyl bromide with imidazole, respectively and characterized by MS, H-1 NMR and FTIR. The long-chain N-alkylimidazole compounds can be reversibly transformed into charged surfactants by exposure to CO2. Surface tension values indicated that N-alkylimidazolium bicarbonates had excellent surface activity compared with corresponding conventional surfactants with a lower gamma (CMC). The surface behaviors of the five surfactants can be illustrated by A (min). Five conductivity cycles by bubbling CO2 and N-2 alternately indicated that these surfactants could be switched by CO2 reversibly and repeatedly. Emulsions were repeatedly stabilized for five cycles by N-alkylimidazolium bicarbonate and broken by bubbling N-2 through the solutions to reverses the reaction, releasing CO2.