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中文摘要：
Gemini表面活性剂（CsH2s-α,ω-（Me2N＋CmH2m＋1Br-）2,m-s-m）与胆汁酸盐（BS）利用静电作用构建超分子复合物,通过改变m-s-m和BS的结构,可以分别得到纳米纤维和囊泡状超分子聚集体.聚集体的形貌、结构和性质分别通过偏光显微镜（POM）、透射电子显微镜（TEM）、场发射扫描电子显微镜（FE-SEM）、X射线粉末衍射（XRD）及其它测试手段进行了表征.研究发现,通过改变m-s-m的烷基链长和间隔基团的长度,以及BS胆甾骨架上羟基的数目和位置,聚集体的形貌会发生明显的变化,聚集体主要依靠静电相互作用,并在疏水作用及氢键的协同作用下形成,本文的结果将有助于更好地理解离子自组装机理,并对超分子聚集体的设计提供新的思路.
英文摘要：
Nanofibers and vesicles are fabricated in aqueous solution by self-assembly of complexes of cationic Gemini surfactants （CsH2s-α,ω-（Me2N＋CmH2m＋1Br-）2,m-s-m） and anionic bile salts （BS）. Their morphology, structure, and properties are characterized by polarized optical microscopy （POM）, transmission electron microscopy （TEM）, field-emission scanning electron microscopy （FE-SEM）, and X-ray powder diffraction （XRD）. The morphology of these aggregates was significantly influenced by minor structural changes of the building blocks, including the spacer and alkyl chain lengths of m-s-m, and the hydroxyl group number and position on the steroid skeleton of the BS. The formation of these aggregates is considered to arise mainly from electrostatic interactions, with contributions from hydrogen bonding and hydrophobic interactions. The results obtained may be helpful for understanding the mechanisms of ionic self-assembly and aid the design of novel supramolecular aggregates.
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