Wetting Properties of Surfactant Systems

这项研究的目的是研究两者 从理论和实验上研究了 表面活性剂系统，重点是微乳液。 一个新 润湿转变的热力学理论将在 重力的影响，这是很重要的， 系统将予以考虑。 条件 润湿转变发生，与结构有关， 表面活性剂也将与此结合进行 study. 实验方法包括新的滴定法 量热法、动态接触角分析和增强的 视频显微镜 一个新的理论模型，基于分子 热力学，将被开发，这仅仅依赖于容易 可测量的参数，允许直接比较 预测和实验结果。 拟议的研究是 具有根本性和现实意义。 将 有助于我们对界面的基本理解 表面活性剂体系中的现象以及许多 表面活性剂体系的性质发挥作用的应用 一个重要的作用，如提高石油采收率，清净性， 液体印刷、微电子、磁记录介质，以及 新的分离方法。 最近有人观察到，当一个人离开一个 微乳液体系中的临界点，润湿转变 可以发生在微乳液相和过量相之间。 这种现象只发生在某些表面活性剂上。 拟议 工作将调查的作用，表面活性剂的结构， 润湿转变 它将侧重于发展一个 微乳液形成的理论模型，这将涉及一个 新的方式与界面区的作用， 形成微乳液。 具体来说， 界面张力将与界面之间的界面张力有关。 阶段。 由于模型只包含可测量的热力学 参数，模型预测润湿的能力 过渡将严格测试该模型。 拟议研究 具有重要的基础性和现实意义。 将 有助于我们对界面的基本理解 表面活性剂体系中的现象以及许多 在工程应用中， 表面活性剂体系起着重要作用，例如强化油 回收，去污，液体印刷，微电子，磁性 记录介质和新的分离方法。

The objective of this proposed research is to study both theoretically and experimentally the wetting behavior of surfactant systems, with emphasis on microemulsions. A new thermodynamic theory of wetting transitions will be developed in which the effects of gravity, which are important in these systems, will be taken into account. Conditions under which wetting transitions occur, as related to the structure of the surfactant, will also be undertaken in conjunction with this study. Experimental methods to be used include novel titration calorimetry, dynamic contact angle analysis, and enhanced videomicroscopy. A new theoretical model, based on molecular thermodynamics, will be developed, which relies only on readily measurable parameters, allowing a direct comparison of predictions and experimental results. The proposed research is of both fundamental and practical significance. It will be beneficial to our fundamental understanding of interfacial phenomena in surfactant systems as well as the numerous applications in which the properties of surfactant systems play an important role, such as enhanced oil recovery, detergency, liquid printing, microelectronics, magnetic recording media, and novel separations processes. It has recently been observed that, as one moves away from a critical point in a microemulsion system, a wetting transition can occur between the microemulsion phase and the excess phases. This phenomenon occurs only for some surfactants. The proposed work will investigate the role of surfactant structure in the wetting transition. It will focus on the development of a theoretical model of microemulsion formation which will deal in a novel manner with the role of the interphase region in the formation of microemulsions. Specifically, the structure of the interphase will be related to the interfacial tension between the phases. As the model will contain only measurable thermodynamic parameters, the ability of the model to predict a wetting transition will rigorously test the model. The proposed research is of both fundamental and practical significance. It will be beneficial to our fundamental understanding of interfacial phenomena in surfactant systems as well as to the numerous engineering applications in which the interfacial properties of surfactant systems play an important role, such as enhanced oil recovery, detergency, liquid printing, microelectronics, magnetic recording media, and novel separations processes.