Sun Yan, Chen Jing, He An-qi, Huang Kun, Yu Lei, Liu Cui-ge, Wei Yong-ju, Zhai Yan-jun, Xu Yi-zhuang, Wu Jin-guang
College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050016, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2010 Oct;30(10):2706-9.
Gels are gaining extensive interest owing to their versatile applications in fields such as drug delivery, tissue engineering, cosmetics, templated materials and food industry. Surfactants have an ability to self-assemble into a variety of supramolecular aggregate structures and morphologies. Of particular interest in resent years are surfactant-based gels, one special class of materials due to surfactant assemblies resulting in viscoelastic solid-like rheological behaviors. Up to now, there is only limited understanding on the mechanism of gel formation, especially on the interaction among water, organic solvents and surfactant during thegel formation. In this study we prepare a Low-molecule-gel that is composed of cetyl trimethyl ammonium bromide (CTAB), water and carbon tetrachloride. Based on the experimental result of XRD and titration, the authors find that CTAB in gel are more than in saturated CTAB solution but CTAB is not solide in gel. CTAB is not solvented in CCl4. The solubility of CTAB in saturated CTAB solution is limited. So the authors suppose that CTAB is a synergistically solubilized by water and CCl4 in the gel. In addition, both NMR and FTIR spectroscopic results demonstrate that CTAB cations form a quasi-ordered structure in the gel.
由于凝胶在药物递送、组织工程、化妆品、模板材料和食品工业等领域的广泛应用，它们正引起广泛关注。表面活性剂能够自组装成各种超分子聚集体结构和形态。近年来，基于表面活性剂的凝胶尤其受到关注，这是一类特殊的材料，因为表面活性剂组装会导致类似粘弹性固体的流变行为。到目前为止，对凝胶形成机制的理解还很有限，特别是在凝胶形成过程中水、有机溶剂和表面活性剂之间的相互作用。在本研究中，我们制备了一种由十六烷基三甲基溴化铵（CTAB）、水和四氯化碳组成的低分子凝胶。基于XRD和滴定的实验结果，作者发现凝胶中的CTAB比饱和CTAB溶液中的多，但CTAB在凝胶中不是固态。CTAB在CCl4中不被溶剂化。CTAB在饱和CTAB溶液中的溶解度有限。因此，作者推测CTAB在凝胶中被水和CCl4协同增溶。此外，NMR和FTIR光谱结果均表明CTAB阳离子在凝胶中形成了准有序结构。
