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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Self-Organization Properties and Microstructures of Sodium N-(11-Acrylamidoundecanoyl)-L-valinate and -L-threoninate in Water
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Self-Organization Properties and Microstructures of Sodium N-(11-Acrylamidoundecanoyl)-L-valinate and -L-threoninate in Water

机译：N-（11-丙烯酰胺基十二烷酰基）-L-缬氨酸钠和-L-苏氨酸钠在水中的自组织性质和微观结构

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摘要

A new class of N-acylamino acid surfactants,sodium N-(11-acrylamidoundecanoyl)-L-valinate (SAUV) and -L-threoninate (SAUT),were synthesized and characterized in aqueous solutions.The self-assembly properties were studied by surface tension,fluorescence probe,light scattering,and microscopic techniques.The interfacial properties of the amphiphiles have been investigated at the air/water interface.The critical aggregation concentration (cac) and free energy change of aggregation for both amphiphiles were determined.The results of fluorescence probe and surface tension studies have indicated that initially flat bilayer structures are formed,which upon a further increase of surfactant concentration transform into closed vesicles.The pH and temperature dependence of the bilayer aggregates have been studied.The role of intermolecular hydrogen bonding between amide groups upon aggregation towards microstructure formation in solution has been elucidated.The micropolarity of the hydrophobic domains of the bilayer self-assemblies was estimated by fluorescence probe methods.Dynamic light scattering measurements were performed to determine the mean size of the aggregates.The circular dichroism spectra of SAUV and SAUT suggested the formation of chiral aggregates in dilute solution.The transmission electron micrographs revealed the presence of closed vesicles and twisted ribbons in the aqueous solutions of the amphiphiles.Optical microscopic images also showed the existence of twisted ribbons and rope-like helical structures in the case of SAUV.
机译：在水溶液中合成并表征了一种新型的N-氨基酸表面活性剂N-（11-丙烯酰胺基十一烷酰基）-L-缬氨酸钠（SAUV）和-L-苏氨酸钠（SAUT）。表面张力，荧光探针，光散射和显微技术。在空气/水界面处研究了两亲物的界面性质。确定了两亲物的临界聚集浓度（cac）和聚集自由能变化。结果荧光探针和表面张力的研究表明，最初形成了平坦的双层结构，随着表面活性剂浓度的进一步增加，该双层结构转变为封闭的囊泡。研究了双层聚集体的pH和温度依赖性。分子间氢键之间的作用阐明了在溶液中向微结构形成聚集时的酰胺基。疏水域的微极性用荧光探针法估计双层自组装体的分子量，进行动态光散射测定以确定团聚体的平均尺寸.SAUV和SAUT的圆二色性光谱表明在稀溶液中形成了手性团聚体。显微照片显示在两亲物的水溶液中存在闭合的囊泡和扭曲的带状结构。光学显微镜图像还显示在SAUV的情况下存在扭曲的带状结构和绳状螺旋结构。

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