Li Ping, Ren Peiyu, Wang Shuoyu, Wang Jiangshan, Sun Zidan, Sun Jiayi, Gu Weibo
High Value Fine Chemicals Research Center, Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China.
Molecules. 2024 May 30;29(11):2570. doi: 10.3390/molecules29112570.
An oleyl alcohol-based extended surfactant, sodium oleyl polyethylene oxide-polypropylene oxide sulfate (OEPS), was synthesized and identified using FT-IR and H NMR. The adsorption and aggregation behaviors of OEPS and its mixture with cationic surfactant alkyltrimethylammoniumbromide (ATAB) were investigated under different molar ratios. The static surface tension analysis indicated that the critical micellization concentration (cmc) and the critical surface tension (γ) of OEPS were 0.72 mmol/L, and 36.16 mN/m, respectively. The cmc and γ values of the binary system were much lower than that of the individual component. And the cmc values of OEPS/ATAB = 6:4 mixtures decreased with an increase in the chain length of the cationic surfactant in the binary system. It was found from the dynamic surface tension that there was a slower diffusion rate in the binary system compared to the pure surfactant, and the adsorption processes for OEPS/ATAB = 6:4 were mixed diffusion-kinetic adsorption mechanisms. With a combination of DLS data and TEM measurements, formations of vesicles in OEPS/ATAB = 6:4 solutions appeared to occur at a concentration of 0.05 mmol/L. By studying the formation of liquid crystal structures in an emulsion prepared with OEPS as the surfactant, it was found that the oil-in-water emulsion is birefringent with a Maltese cross texture, and the rheological properties revealed its predominant viscoelastic behavior and shear thinning properties.
合成了一种基于油醇的扩展表面活性剂油醇聚环氧乙烷 - 聚环氧丙烷硫酸盐（OEPS），并使用傅里叶变换红外光谱（FT - IR）和核磁共振氢谱（H NMR）对其进行了鉴定。研究了OEPS及其与阳离子表面活性剂烷基三甲基溴化铵（ATAB）的混合物在不同摩尔比下的吸附和聚集行为。静态表面张力分析表明，OEPS的临界胶束浓度（cmc）和临界表面张力（γ）分别为0.72 mmol/L和36.16 mN/m。二元体系的cmc和γ值远低于各单一组分的值。并且在二元体系中，OEPS/ATAB = 6:4混合物的cmc值随着阳离子表面活性剂链长的增加而降低。从动态表面张力发现，与纯表面活性剂相比，二元体系中的扩散速率较慢，并且OEPS/ATAB = 6:4的吸附过程为混合扩散 - 动力学吸附机制。结合动态光散射（DLS）数据和透射电子显微镜（TEM）测量结果，发现在OEPS/ATAB = 6:4溶液中，当浓度为0.05 mmol/L时会出现囊泡形成。通过研究以OEPS为表面活性剂制备的乳液中液晶结构的形成，发现水包油乳液具有马耳他十字纹理的双折射现象，并且流变学性质显示其具有主要的粘弹性行为和剪切变稀特性。
