Statistical Mechanics of Suspensions, Polymers and Chemically Reactive and Nonuniform Fluids

悬浮液、聚合物以及化学反应性和不均匀流体的统计力学

• 批准号: 9527763
• 负责人: John Dahler
• 金额: $ 33万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-02-01 至 1999-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527763&HistoricalAwards=false
• 关键词: Statistical; Mechanics; Suspensions; Polymers; Chemically

John Dahler is supported by a grant from the Theoretical and Computational Chemistry Program to continue his theoretical statistical mechanical research on suspensions, polymers, and chemically reactive and non-uniform fluids. Four specific areas of research are being pursued: 1) Statistical mechanical studies of non-uniform systems that seek to extend a new theory of non-uniform but static thermodynamic field variables to incorporate fluxes and rates of relaxation and reaction in terms of well-defined correlation integrals of microdynamic variables; 2) An extension of a theory of colloidal dispersions and applications to studies of frequency-dependent viscoelastic moduli and of sedimentation and light scattering; 3) Studies involving a theory of chemically reactive fluids to examine density fluctuations caused by size changes of the species involved in reactions and the effects of chemical reaction on collective modes of the fluid such as those associated with ordinary and fast sound; and 4) Studies of the equilibrium properties of ideal polymer chains to incorporate the effects of excluded volume interactions. A number of commercially important products are derived from colloidal dispersions and solutions of polymers. Dahler's research is focused on a molecular level understanding of the physical properties of such complex fluid systems. A deeper understanding of these systems may lead to improved materials properties and new commercial applications.

John Dahler得到了理论和计算化学计划的资助，继续他对悬浮液、聚合物以及化学反应和非均匀流体的理论统计力学研究。目前正在进行四个具体领域的研究：1)非均匀系统的统计力学研究，寻求扩展非均匀但静态热力学场变量的新理论，以根据定义明确的微观动力学变量的相关积分来包含通量和松弛速率和反应速率；2)胶体分散理论的扩展，并应用于频率相关粘弹性模数以及沉积和光散射的研究；3)涉及化学反应流体理论的研究，以检查由参与反应的物种的尺寸变化引起的密度波动以及化学反应对流体的集体模式的影响，例如与普通和快速声音相关的那些模式；以及4)包括排除的体积相互作用的影响的理想聚合物链的平衡性质的研究。许多具有重要商业价值的产品是从聚合物的胶体分散体和溶液中衍生出来的。Dahler的研究侧重于从分子水平上理解这类复杂流体系统的物理性质。对这些系统的深入了解可能会导致材料性能的改善和新的商业应用。