CO2/N2 Triggered Switchable Surfactants with Imidazole Group was written by Chai, Mingfeng;Zheng, Zhibo;Bao, Lei;Qiao, Weihong. And the article was included in Journal of Surfactants and Detergents in 2014.COA of Formula: C11H20N2 This article mentions the following:
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, resp. and characterized by MS, 1H 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 γCMC. The surface behaviors of the five surfactants can be illustrated by Amin. Five conductivity cycles by bubbling CO2 and N2 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 N2 through the solutions to reverses the reaction, releasing CO2. In the experiment, the researchers used many compounds, for example, 1-Octyl-1H-imidazole (cas: 21252-69-7COA of Formula: C11H20N2).
1-Octyl-1H-imidazole (cas: 21252-69-7) belongs to imidazole derivatives. The solubility of imidazoles in ethers is lower than that in alcohols and decreases with increasing chain length of the ethers . In contrast, the solubility of benzimidazoles in alcohols (C3–C6) is higher than in water and generally decreases with a This ring system is present in important biological building blocks, such as histidine and the related hormone histamine.COA of Formula: C11H20N2
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem