Irreversible Adsorption from Solution

从溶液中不可逆吸附

• 批准号: 8802589
• 负责人: Arthur Adamson
• 金额: $ 20.05万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1993-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8802589&HistoricalAwards=false
• 关键词: Irreversible; Adsorption; Solution

This project is in the area of analytical and surface chemistry and in the subfield of interfacial processes. The thrust of this experimental program is the testing of recently developed theoretical models which provide explication of the fundamental molecular interactions that underlie irreversible adsorption from solution. The adsorption of molecules from solution onto a surface is said to be reversible when the kinetics of the adsorption and desorption processes are comparable. In systems where irreversible adsorption is observed, the kinetics of desorption are significantly slower than the kinetics of adsorption. This implies that molecular-level changes take place in the adsorbed layer subsequent to adsorption; such implication has significant fundamental and applied importance. Infrared and photoexcited emission spectroscopy will be used to study both the structures of irreversibly adsorbed layers and the kinetics of their formation and dissolution. Additionally, surface ellipsometry will be employed for fast kinetic studies that are necessary to follow the surface phase change that converts reversible to irreversible behavior. Studies of the effects of pressure and solution conditions and also of substrate composition on adsorption behavior will be pursued to help to define the molecular details of these interfacial processes. This important but largely unexplored phenomenon of irreversible adsorption is important not only to an enhanced understanding of fundamental molecular interactions at interfaces, but also to technologically important areas such as tertiary oil recovery, surface lubrication and wear, photocatalysis, and the interaction of implantable prosthetic devices with their in vivo environments.

该项目是在分析和表面化学领域 和界面过程的子领域。 这件事的主旨是 实验计划是测试最近开发的 理论模型提供了基本的解释， 分子间的相互作用是不可逆吸附的基础 溶液 分子从溶液中吸附到 表面被认为是可逆的，当动力学的 吸附和解吸过程是可比的。 系统中 当观察到不可逆吸附时， 解吸的动力学明显慢于 吸附作用 这意味着分子水平的变化发生 在吸附后的吸附层中;这种含义 具有重要的基础和应用价值。 红外和 光激发发射光谱将被用来研究这两个 不可逆吸附层的结构和动力学 它们的形成和分解。 此外，Surface 椭圆偏振法将用于快速动力学研究， 必须遵循表面相变， 可逆到不可逆的行为。 影响的研究 压力和溶液条件以及基质组成 吸附行为将被追求，以帮助确定 这些界面过程的分子细节。 这一重要但基本上未被探索的不可逆转的现象 吸附不仅对增强对 界面上的基本分子相互作用， 技术上重要的领域如三次采油， 表面润滑与磨损、磨损及相互作用 在体内植入假体装置 环境.