Structure-property relationships in metallosurfactants
Structure-property relationships in metallosurfactants
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DOI：
10.1039/b920143b
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发表时间：
2010-01-01
期刊：
影响因子：
3.4
通讯作者：
Paul, Alison
中科院分区：
文献类型：
--
作者：
Griffiths, Peter C.;Fallis, Ian A.;Paul, Alison
用小角中子散射（SANS）研究了由大环、线型和双子头基三种金属表面活性剂形成的胶束的形态。所有的数据可以通过调用球形胶束形态的模型来描述，其中胶束的尺寸与金属表面活性剂内的组成基团的已知化学结构一致。对于主要形成球形胶束的1-（2-羟基-十四烷基）-1，4，7-三氮杂环壬烷和形成盘状胶束的1-（2-羟基-十四烷基）-1，4，7，10-四氮杂环壬烷这两种大环头基金属表面活性剂，金属离子及其反离子对胶束形态的影响可以忽略不计。具有这两个大环头部基团的表面活性剂的二元混合物（具有同或杂金属离子/抗衡离子）形成混合胶束，其形态是两个单组分胶束的平均值。此外，对于单一的表面活性剂溶液中发现，金属和抗衡离子对混合表面活性剂胶束的形态没有影响。最后，两个双子表面活性剂的胶束形态也被证明是不敏感的金属和抗衡离子的数量和性质，但敏感的头基的结构。这些观察大大扩展了我们对这些有趣分子的化学结构和胶束形态之间关系的理解。
The morphology of micelles formed by three sub-classes of metallosurfactants-those with macrocyclic, linear and gemini head groups-has been studied by small-angle neutron scattering (SANS) for a series of metal- and counter-ions. All the data may be described by a model that invokes a globular micelle morphology in which the dimensions of the micelle are consistent with the known chemical structure of the constituent groups within the metallosurfactant. For two macrocyclic head group metallosurfactants, viz. 1-(2-hydroxy-tetradecyl)-1,4,7-triazacyclonane that forms predominantly spherical micelles and 1-(2-hydroxy-tetradecyl)-1,4,7,10-tetraazacyclononane that forms disc-like micelles, the metal ion and its counter-ion have a negligible effect on the morphology of the micelle. Binary mixtures of surfactants with these two macrocyclic head groups (with homo- or hetero-metal ions/counter-ions) form mixed micelles whose morphology is an average of the two single component micelles. Further, as found for the single surfactant solutions, the metal and counter-ion had no effect on the morphology of the mixed surfactant micelle. Lastly, the micelle morphology of two gemini surfactants was also shown to be insensitive to the number and nature of the metal and counter-ions present, but sensitive to the structure of the head group. These observations considerably extend our understanding of the relationship between chemical structure and micelle morphology for these interesting molecules.