title: CO2-responsive aliphatic tertiary amine-modified alginate and its application as a switchable surfactant.
abstract: A new kind of hexyl diethyl tertiary amine-grafted amphiphilic alginate derivative (HDEA-Alg) was synthesized from (6-bromo-hexyl)-diethyl-amine (BHDEA) and sodium alginate (NaAlg) through esterification. The structure of HDEA-Alg was confirmed by FT-IR and NMR spectroscopies. The grafting ratio was calculated according elemental analysis and thermodynamic property was analyzed by TG. The CO2/N2-responsive performance of HDEA-Alg in aqueous solution was demonstrated by surface tension and conductivity measurements. Stable emulsions of liquid paraffin were easily prepared in the presence of the HDEA-Alg. These emulsions can be de-emulsified by bubbling CO2 through the emulsions at 5°C for 30min, resulting in complete oil/water phase separations. They can be re-emulsified by bubbling N2 through the solutions at 50°C for 30min with the aid of homogenization.
authors: School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China. Electronic address: jsyang@yzu.edu.cn.
authors: Jisheng
authors: J
authors: Yang
authors: School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
authors: Hongbiao
authors: H
authors: Dong
mesh_terms: D000464:Alginates / Q000378:metabolism*; D000588:Amines / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism*; D020723:Glucuronic Acid / Q000378:metabolism; D006603:Hexuronic Acids / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents / Q000378:metabolism*
chemical_list: D000464:Alginates; D000588:Amines; D006603:Hexuronic Acids; D013501:Surface-Active Agents; D002245:Carbon Dioxide; D020723:Glucuronic Acid
keywords: CO(2)-responsive; Modified alginate; Switchable surfactant