Abstract
Abstract Three Gemini betaine surfactants bis [N-methylene-N-dimethyl (1-alkyl-1-sodium formate) methine] ammonium bromides (n = 10, 12, 14) were synthesized by substitution reaction, quaternization and neutralization reaction with tetramethylethylenediamine, bromine (Br2), sodium hydroxide (NaOH) and long chain alkyl acid as main raw materials. The chemical structures of the prepared compounds were confirmed by FTIR, 1H NMR, MS spectroscopy and element analysis. With the increasing length of the carbon chain, the values of their CMC (critical micellar concentration) initially decreased. These compounds were superior in surface active properties to single chain betaine surfactant such as decyl dimethyl betaine surfactant. The efficiency of adsorption at the water/air interface (pC20) of these surfactants was very high. The shorter the hydrocarbon chain length of Gemini betaine surfactants, the faster the rate of reduction of surface tension, and smaller the aggregation number of Gemini betaine surfactants. Micelle diameter and maximum wetting angle of pure water drop/air increased, but maximum wetting angle of water phase/n-decane decreased with the increase of the hydrophobic chain length. Their foaming properties toward a felt chip and lime-soap dispersing ability were investigated.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Taiwan Institute of Chemical Engineers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
