Dynamic and Non-Equilibrium Aspects of Polymer Adsorption

聚合物吸附的动态和非平衡方面

• 批准号: 9634594
• 负责人: Christopher Durning
• 金额: $ 24万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-15 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634594&HistoricalAwards=false
• 关键词: Dynamic; Non; Equilibrium; Aspects; Polymer

CTS-9634594 Durning, Turro-Columbia University SUMMARY DYNAMIC AND NON-EQUILBRIUM ASPECTS OF POLYMER ADSORPTION The adsorption of flexible macromolecules onto solids plays an important role in many technologies because of the dramatic surface modifications caused by the adsorption . Research will be performed on flexible, linear homopolymers adsorbing on well-characterized surfaces using four in-situ techniques with molecular-level sensitivity: fluorescence spectroscopy, ultrasonic quartz crystal resonators, neutron reflection, and pattern photobleaching. These methods will allow a systematic study of elementary dynamic processes in adsorbed layers: osmotic relation (i.e., swelling collapse) and translational diffusion of individual adsorbed polymers. They will also clarify the mechanisms controlling adsorption kinetics and exchange of polymers between adsorbed and bulk phases. The experiments will be supplemented by computer simulations, providing mechanistic insight , The results will supply new guidelines for manipulation and control of adsorbed layers, benefiting a variety of technologies. Examples include technologies relying on colloidal suspensions where adsorption affects suspension stability and rheology, extrusion and molding operations where adsorption on machine surfaces affects flow stability and fouling, and in biomedical technologies involving prosthetic and blood contacting devices where biopolymer adsorption controls thrombosis and cell adhesion.

CTS-9634594 杜宁-哥伦比亚大学 总结 聚合物吸附的动态和非平衡态 柔性大分子在固体上的吸附在许多技术中起着重要的作用，因为吸附引起的剧烈的表面改性。 研究将进行灵活的，线性均聚物吸附在良好的表征表面上使用四个原位技术与分子水平的灵敏度：荧光光谱，超声波石英晶体谐振器，中子反射，和图案光漂白。 这些方法将允许系统地研究吸附层中的基本动力学过程：渗透关系（即，溶胀塌陷）和单个吸附聚合物的平移扩散。 他们还将阐明控制吸附动力学和吸附相和体相之间的聚合物交换的机制。 实验将辅以计算机模拟，提供机制的见解，结果将提供新的指导方针的操作和控制的吸附层，有利于各种技术。 实例包括依赖于胶体悬浮液的技术，其中吸附影响悬浮液的稳定性和流变性;挤出和成型操作，其中在机器表面上的吸附影响流动稳定性和结垢;以及涉及假体和血液接触装置的生物医学技术，其中生物聚合物吸附控制血栓形成和细胞粘附。