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Annular and threadlike wormlike micelles formed by a bio-based surfactant containing an extremely large hydrophobic group†
Soft Matter ( IF 2.9 ) Pub Date : 2017-12-18 00:00:00 , DOI: 10.1039/c7sm02163a Zhaolan Zhai 1, 2, 3, 4, 5 , Xinyan Yan 1, 2, 3, 4, 5 , Zhanqian Song 1, 2, 3, 4, 5 , Shibin Shang 1, 2, 3, 4, 5 , Xiaoping Rao 1, 2, 3, 4, 5
Soft Matter ( IF 2.9 ) Pub Date : 2017-12-18 00:00:00 , DOI: 10.1039/c7sm02163a Zhaolan Zhai 1, 2, 3, 4, 5 , Xinyan Yan 1, 2, 3, 4, 5 , Zhanqian Song 1, 2, 3, 4, 5 , Shibin Shang 1, 2, 3, 4, 5 , Xiaoping Rao 1, 2, 3, 4, 5
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A novel bio-based anionic surfactant containing a large rigid group and a flexible alkyl chain, namely, sodium N-dodecyl-maleimidepimaric carboxylate (C12-MPA-Na), was synthesized from rosin. The molecular structure of C12-MPA-Na was identified using 1H NMR, FT-IR spectroscopy and MS. Despite containing 36 carbon atoms, C12-MPA-Na showed good water solubility at room temperature. Large spherical aggregates with diameters of 100–200 nm were formed by C12-MPA-Na when its concentration was above 0.1 mM, which was slightly higher than the critical micelle concentration (0.078 mM). Annular wormlike micelles were discovered with increasing C12-MPA-Na concentration, and began to change into extremely long threadlike wormlike micelles when the C12-MPA-Na concentration reached approximately 58 mM. The viscoelastic properties of the wormlike micelle solutions were investigated using steady state and oscillatory shear sweep rheological measurements. The zero-shear viscosity (η0) strongly depended on the concentration of C12-MPA-Na, and the scaling exponent was 34.1. Cryo-TEM confirmed the formation of large spherical aggregates and wormlike micelles. 1H–1H 2D nuclear Overhauser effect spectroscopy (NOESY) was used to detect the molecular interactions of C12-MPA-Na. The results indicated that the alkyl chain of C12-MPA-Na was partially overlapped with its non-planar rigid structure in aqueous solution, and the possible aggregation process for C12-MPA-Na was proposed.
中文翻译：
由含有极大疏水基团的生物基表面活性剂形成的环状和线状蠕虫状胶束†
由松香合成了一种新型的生物基阴离子表面活性剂，其具有较大的刚性基团和柔性的烷基链，即N-十二烷基-马来酰亚胺-吡喃羧酸钠（C 12 -MPA -Na）。使用1 H NMR，FT-IR光谱和MS鉴定C 12 -MPA-Na的分子结构。尽管含有36个碳原子，但C 12 -MPA-Na在室温下显示出良好的水溶性。当C 12 -MPA-Na的浓度高于0.1 mM时，会形成直径为100-200 nm的大型球形聚集体，该浓度略高于临界胶束浓度（0.078 mM）。随着C 12的增加，发现环状虫状胶束-MPA-Na浓度，并且当C 12 -MPA-Na浓度达到约58 mM时开始变为极长的线状蠕虫状胶束。使用稳态和振荡剪切扫描流变学测量研究蠕虫状胶束溶液的粘弹性质。零剪切粘度（η 0）强烈依赖于C的浓度12 -MPA-Na和所述标度指数为34.1。低温透射电镜证实了大的球形聚集体和蠕虫状胶束的形成。使用1 H– 1 H 2D核Overhauser效应光谱（NOESY）来检测C 12 -MPA-Na的分子相互作用。结果表明，C的烷基链12 -MPA-Na在水溶液中与其非平面刚性结构部分重叠，并提出了C 12 -MPA-Na可能的聚集过程。
更新日期：2017-12-18
中文翻译：
由含有极大疏水基团的生物基表面活性剂形成的环状和线状蠕虫状胶束†
由松香合成了一种新型的生物基阴离子表面活性剂，其具有较大的刚性基团和柔性的烷基链，即N-十二烷基-马来酰亚胺-吡喃羧酸钠（C 12 -MPA -Na）。使用1 H NMR，FT-IR光谱和MS鉴定C 12 -MPA-Na的分子结构。尽管含有36个碳原子，但C 12 -MPA-Na在室温下显示出良好的水溶性。当C 12 -MPA-Na的浓度高于0.1 mM时，会形成直径为100-200 nm的大型球形聚集体，该浓度略高于临界胶束浓度（0.078 mM）。随着C 12的增加，发现环状虫状胶束-MPA-Na浓度，并且当C 12 -MPA-Na浓度达到约58 mM时开始变为极长的线状蠕虫状胶束。使用稳态和振荡剪切扫描流变学测量研究蠕虫状胶束溶液的粘弹性质。零剪切粘度（η 0）强烈依赖于C的浓度12 -MPA-Na和所述标度指数为34.1。低温透射电镜证实了大的球形聚集体和蠕虫状胶束的形成。使用1 H– 1 H 2D核Overhauser效应光谱（NOESY）来检测C 12 -MPA-Na的分子相互作用。结果表明，C的烷基链12 -MPA-Na在水溶液中与其非平面刚性结构部分重叠，并提出了C 12 -MPA-Na可能的聚集过程。
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