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Mesostructure in Cat-anionic Surfactant-Polymer Films

阳离子表面活性剂聚合物薄膜中的介观结构

基本信息

批准号：
EP/H00985X/1
负责人：
Karen Edler
金额：
$ 0.67万
依托单位：
University of Bath
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FH00985X%2F1
关键词：
Mesostructure Cat anionic Surfactant Polymer

项目摘要

This proposal is for travel to undertake experiments using neutron reflectivity on the new instrument Platypus on the OPAL reactor at ANSTO in Sydney. It is difficult to obtain neutron reflectivity beamtime for open liquid surface samples due to the small number of instruments world-wide which are configured to take samples in this geometry and the popularity of this technique which means existing instruments are generally oversubscribed. We have succeeded in obtaining 2 days of beamtime in a competitive peer reviewed proposal scheme, on this brand new instrument, and now request travel funding to go to Sydney to carry out this experiment. The work continues our investigations into polyelectrolyte-surfactant solutions which form solid films by adsorption at the air-solution interface funded under EPSRC grant EP/E029914/1. Our initial investigations focused on the polyethylenimine-cationic surfactant system but we have now found that film formation is a general feature of solutions containing mixed aggregates of a cationic and an anionic surfactant in the presence of water soluble polymers. This enables use of biocompatible polymers which mean these films may be able to be used in enacapsulation of therapeutics for controlled delivery applications for instance in wound dressings. In this neutron reflectivity experiment we will make use of contrast variation in order to determine the proportion of each surfactant in the mesostructures of films containing CTAB and SDS with polyethylene oxide or polyacrylamide. We will investigate several different total surfactant and polymer concentrations for five CTAB:SDS ratios to study the effects on structures formed in this system. While in Sydney we have also been invited to visit Prof Greg Warr at the School of Chemistry, Sydney University to give a seminar and to observe a modified small angle X-ray scattering instrument similar to an instrument in Dr Edler's lab in Bath, with a view to implementing this modification on the Bath instrument.

这项建议是旅行进行实验，利用新仪器鸭嘴兽的OPAL反应堆在澳大利亚悉尼的ANSTO。这是很难获得中子反射率beamtime的开放液体表面样品，由于仪器的数量很少，全球范围内的配置，以这种几何形状和这种技术的普及，这意味着现有的仪器通常是超额认购。我们已经成功地获得了2天的波束时间在竞争性同行评审的建议方案，在这个全新的仪器，现在要求旅行资金去悉尼进行这项实验。这项工作继续我们的调查，聚电解质表面活性剂的解决方案，形成固体膜的吸附在空气中的解决方案的界面下EPSRC资助EP/E029914/1。我们最初的研究集中在聚乙烯亚胺-阳离子表面活性剂体系上，但我们现在发现，在水溶性聚合物的存在下，成膜是含有阳离子和阴离子表面活性剂的混合聚集体的溶液的一般特征。这使得能够使用生物相容性聚合物，这意味着这些膜可以能够用于治疗剂的包封，以用于例如伤口敷料中的受控递送应用。在这个中子反射率实验中，我们将利用对比度的变化，以确定每种表面活性剂的比例在介观结构的膜含有CTAB和SDS与聚环氧乙烷或聚丙烯酰胺。我们将研究几种不同的总表面活性剂和聚合物浓度的五个CTAB：SDS的比例，研究在这个系统中形成的结构的影响。在悉尼期间，我们还应邀访问了悉尼大学化学学院的Greg Warr教授，并参加了一个研讨会，并观察了一种改进的小角度X射线散射仪器，该仪器类似于Edler博士在Bath实验室的仪器，以期在Bath仪器上实施这种修改。