文献类型：期刊文献

英文题名：Rheological behavior of mixed system of ionic liquid [C8mim] Br and sodium oleate in water

作者：He, Zimeng;Yue, Ling;Li, Meng;Shang, Yazhuo[1];Liu, Honglai

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2015

卷号：9

期号：2

起止页码：232

外文期刊名：FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000360319600010)】；

基金：This work is supported by the National Natural Science Foundation of China (Grant Nos. 21173079, 91334203 and 21476072), the 111 Project (No. B08021) and the Fundamental Research Funds for the central universities of China.

语种：英文

外文关键词：rheological behavior; ionic liquid surfactant; sodium oleate; wormlike micelles; viscoelasticity

摘要：We report on the rheological behavior of wormlike micelles constructed by ionic liquid surfactant [C(8)mim] Br (1-octyl-3-methylimidazolium bromide) and anionic surfactant sodium oleate (NaOA) in aqueous solution. The effects of surfactant composition, total surfactant concentration, added salts, and temperature were investigated. The prevailing surfactant effect at lower concentration and the leading cosolvent effect at higher concentration of [C8mim] Br may be the main reasons for appearance of well-established maximum in key rheological parameters with variation of surfactant composition and total surfactant concentration. The Cole-Cole plots demonstrate that the systems (total surfactant concentration falls within 0.17-0.35 mol.L-1 and molar ratio 0.33 <= R <= 0.50) fit the Maxwell's mechanical model as linear viscoelastic fluid. The addition of NaBr or sodium salicylate decreases significantly the viscosity and the relaxation time of the wormlike micelle solution but cannot change the value of plateau modulus G0. The present system has low rheological tolerance to temperature. The increase of temperature decreases the average contour length and viscosity of wormlike micelles and thus strengthens the relaxation progress of diffusion and weakens the relaxation progress of reptation. Increasing the temperature also decreases the value of plateau modulus G0 and shifts the minimum value of the loss modulus G. min to higher frequencies.