Critical Phenomena in Silica Gel

硅胶中的临界现象

• 批准号: 9320726
• 负责人: David Cannell
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9320726&HistoricalAwards=false
• 关键词: Critical; Phenomena; Silica; Gel

9320726 Cannell Technical abstract: This Condensed Matter Physics project used light scattering and thermodynamic measurements to study the effectd of quenched impurities on critical phenomena and phase separations in fluids containing two components. The quenched impurities are gel structures of dilute rigid silica networks. The large surface area of these networks influence the equilibrium and non-equilibrium properties of fluids that are entrained in these gel structures. The behavior of binary fluids in these gels are studied by static and dynamic light scattering, as well as calorimetry. The combination of thermodynamic and scattering measurements on controlled samples should add considerable to our understanding of the effects of porous materials on liquid systems, as well as to the broader issue of their effects on phase in other systems. Non-technical abstract: This Condensed Matter Physics employs light scattering and thermodynamic measurements to study the effects of quenched impurities on critical phenomena and phase separations in fluids containing two components. The quenched impurities are gel structures of dilute rigid silica networks. When fluids fill the interstitices between the gel strands, their equilibrium and non-equilibrium properties are modified by the large surface area of the gel network. The behavior of binary fluids in these gels are studied by static and dynamic light scattering, as well as calorimetry. The combination of thermodynamic and scattering measurements on controlled samples should add considerable to our understanding of the effects of porous materials on liquid systems, as well as to the broader issue of their effects on phase in other systems. For example, there are many instances in nature where fluids, such as oil, are entrained in high surface are solids, such as shale. This fundamental study may provide information relevant to these technologically important systems. ***

9320726 Cannell技术摘要：这个凝聚态物理项目使用光散射和热力学测量来研究淬灭杂质对临界现象和含有两种组分的流体中的相分离的影响。淬灭的杂质是稀释的刚性二氧化硅网络的凝胶结构。这些网络的大表面积影响夹带在这些凝胶结构中的流体的平衡和非平衡性质。通过静态和动态光散射以及量热法研究了这些凝胶中二元流体的行为。控制样品上的热力学和散射测量的组合应增加相当多的多孔材料对液体系统的影响，以及在其他系统中的相位的影响更广泛的问题，我们的理解。非技术摘要：这个凝聚态物理学采用光散射和热力学测量研究淬火杂质对临界现象和含有两种组分的流体中的相分离的影响。淬灭的杂质是稀释的刚性二氧化硅网络的凝胶结构。当流体填充凝胶链之间的凝胶时，它们的平衡和非平衡性质被凝胶网络的大表面积改变。通过静态和动态光散射以及量热法研究了这些凝胶中二元流体的行为。控制样品上的热力学和散射测量的组合应增加相当多的多孔材料对液体系统的影响，以及在其他系统中的相位的影响更广泛的问题，我们的理解。例如，在自然界中存在许多情况，其中流体（例如油）被夹带在高表面中，而固体（例如页岩）是高表面的。这项基础研究可能提供与这些技术上重要的系统相关的信息。***