受限于介孔材料和磷脂膜中水及水溶液的物性和结构

项目名称： 受限于介孔材料和磷脂膜中水及水溶液的物性和结构

项目编号： No.10874208

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 王强

作者单位： 中国科学院物理研究所

项目金额： 39万元

中文摘要： 水和水溶液在受限状态下物性和结构是软物质物理的基本问题之一，与液体在生命体系中的输运和作用、相分离、微流、化学合成等密切相关，涉及生命、环境、健康、医药、材料等多个领域，对其研究有重要的科学意义和应用背景。本项目主要通过改变介孔材料表面极性强弱和亲水－疏水转变、调控吸附量的方法研究不同状态下受限水的分子振动、转动、偶极子驰豫、热力学参量密度及离子近邻原子结构的变化，探讨界面对受限水和水溶液物性和结构的影响规律。通过研究在吸附和脱附过程中的差异，了解介孔材料吸附滞后的原因。通过研究受限于磷脂膜间的受限水和水溶液结构和物性随受限厚度的变化特点，认识受限尺寸对受限液体的影响规律。本项目主要研究方法是：选择合适受限液体的载体；控制受限液体的填充率；用Raman谱和介电谱测量受限水分子的振动、转动，以及驰豫时间随填充率和温度变化；用XAFS方法研究受限水溶液的离子的局域结构。

中文关键词： 受限水;受限水溶液;介孔;磷脂膜;结构和性质

英文摘要： The structure together with the physical properties of confined water and aqueous solution is one of the fundamental question of softmatter physics. The investigated contents include the transport of liquid within living system,phase separation,nano-fluid,and chemosynthesis etc. The questions relate to living,environment,health, medicament and material fields, therefore the research of confined water and its solution has important scientific Significance and application background. By changing the strengh of polarity, hydrophile or hydrophobic property of the surface of mesoporous material, to investigate the relationship between the filling fraction and the vibration and rotation of water molecule, the dipole relaxation, the thermal property (such as density) of confined water, and the nearest neighbour structure of ion in aqueous solution. These contents are very helpful to find the influence of the surface of mesoporous on the physical property and structure of confined water and aqueous solution. In addition, to study the reason resluting in the hysteresis of the addsorption of mesoporous by comparing the same contents mentiond above obtained from addsorption and desorption processes,respectively. The influence of confined size on the behaviour of confined liquids can also be studied in detail by changing the thickness of phospholipid membrane, where water and aqueous solution are confined. The main studying methods of this project are to select suitable mesoporous material and to quantificationally control the filling fraction. Raman and dielectric spectroscopy are respectively used to study the variety of vibration and relaxation of water molecule with changing filling fraction and temperature. XAFS can be used to study the nearest neighbour structure of confined aqueous solution.

英文关键词： confined water;confined aqueous solution;mespporous material;phospholipid membrane;physical properties and structure