Effect of nanoporous confinement on the phase behaviour of aqueous solutions

纳米孔约束对水溶液相行为的影响

• 批准号: 530248875
• 负责人: Professor Dr. Michael Fröba
• 金额: --
• 依托单位: Institut de Physique de Rennes (IPR)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/530248875?language=en
• 关键词: Effect; nanoporous; confinement; phase; behaviour

The effects of nanoporous confinement on the fundamental properties of condensed matter are numerous. A general understanding of the phase behaviour, dynamic and transport properties of nanoconfined fluids has been acquired for the last two decades from abundant studies that have addressed different aspects such as the capillary condensation, freezing/melting, glassy dynamics, molecular diffusion and liquid imbibition. However, it is notorious that classical descriptions of pure (unary) confined fluids fail to capture entirely the upper level of complexity attained with multicomponent systems. For example, it was recently shown that classical thermodynamics, combining Gibbs-Thomson and Raoult’s laws fail to explain the experimental phase behaviour of binary nanoconfined solutions. In this context, the ultimate aim of the project is to elucidate and model the different phenomena that dictate the phase behaviour (vapor/liquid/glass/crystal) of aqueous solutions in nanoporous materials. This requires addressing important aspects, covering structure and dynamics that have played secondary role or that were simply not relevant for previous physical studies of unary confined liquids. Our project will benefit from carefully designed advanced porousmaterials that will be used as model systems to generate and control the in/homogeneous character of the confined phases. This will allow studying the effects of polydispersed porosity as obtained with hierarchical porous materials, or spatially modulated surface interactions as obtained with porous materials alternating hydrophobic/hydrophilic regions.Organic molecules, molecular ions and inorganic salts will be used as a panel of solutes with controllable size, polarizability and hydrophilic character.

纳米孔限制对冷凝物质基本特性的影响很多。在过去的二十年中，已经通过大量研究获得了对纳米结合流体的相行为，动态和转运特性的一般理解，这些研究已经解决了不同方面的研究，例如毛细管凝结，冻结/融化，玻璃状动力学，分子差异和液体含量。但是，臭名昭著的是，对纯的（一元）约束烟的经典描述无法完全捕获多组分系统实现的复杂性上层。例如，最近表明，将吉布斯·汤姆森（Gibbs-Thomson）和拉乌尔特（Raoult）定律结合在一起的经典热力学无法解释二进制纳米固定溶液的实验阶段行为。在这种情况下，该项目的最终目的是阐明和建模纳米多孔材料中水溶液的不同现象（蒸气/液体/液体/玻璃/晶体）。这需要解决重要方面，涵盖扮演次要角色的结构和动力学，或者与以前对单一受限液液体的物理研究无关。我们的项目将受益于精心设计的高级多孔材料，这些材料将用作模型系统，以生成和控制密闭相位的IN/同质特征。允许研究用分层多孔材料获得的多分散孔隙度的影响，或用多孔材料获得的空间调节表面相互作用替代疏水/亲水区域。有机分子，分子离子和无机盐将用作具有控制尺寸的尺寸，极化，疏水性和疏水性的固体面板。