物理化学学报 >> 2013, Vol. 29 >> Issue (11): 2415-2421.doi: 10.3866/PKU.WHXB201309243

软物质 上一篇    下一篇

胆酸盐与Gemini表面活性剂复合物构建的纳米纤维和囊泡

朱丽杰, 黄丹丹, 李钦堂, 许冠辰, 陈晓   

  1. 山东大学胶体与界面化学教育部重点实验室, 济南 250100
  • 收稿日期:2013-07-18 修回日期:2013-09-23 发布日期:2013-10-30
  • 通讯作者: 陈晓 E-mail:xchen@sdu.edu.cn
  • 基金资助:

    国家自然科学基金(20973104,21033005,21373127)资助项目

Nanofibers and Vesicles Self-Assembled fromGemini Surfactant Complexes with Bile Salts

ZHU Li-Jie, HUANG Dan-Dan, LI Qin-Tang, XU Guan-Chen, CHEN Xiao   

  1. Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, Shandong University, Jinan 250100, P. R. China
  • Received:2013-07-18 Revised:2013-09-23 Published:2013-10-30
  • Contact: CHEN Xiao E-mail:xchen@sdu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973104, 21033005, 21373127).

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.

关键词: 自组装, Gemini表面活性剂, 胆酸盐, 聚集体, 超分子作用

Abstract:

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 fromelectrostatic interactions, with contributions fromhydrogen 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.

Key words: Self-assembly, Gemini surfactant, Bile salt, Aggregate, Supramolecular interaction

MSC2000: 

  • O648