Probing Heterocoagulation in Binary Colloidal Mixtures by Simultaneous Static and Dynamic Light Scattering

通过同时静态和动态光散射探测二元胶体混合物中的异质凝结

• 批准号: 9820795
• 负责人: Michal Borkovec
• 金额: $ 17.1万
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9820795&HistoricalAwards=false
• 关键词: Probing; Heterocoagulation; Binary; Colloidal; Mixtures

AbstractCTS-9820795M. Borkovec, Clarkson U.Simultaneous static and dynamic light scattering is proposed to measure heteroaggregation rate constants in binary colloidal mixtures. The experimental study will be performed on carboxyl (A) and zwitterionic (B) latex particles. Absolute formation rate constants for all dimers (AA, AB and BB) will be measured as a function of solution pH and ionic strength. The experimental data will be compared to the theory of Derjagurin, Landau, Vervey and Overbeek (DLVO). The authors will investigate the limits of validity of DLVO-theory for small separation distances ( 1 nm) of the barrier in the particle-particle interaction potential, where the theory apparently fails. The proposed work has relevance to stabilization, coagulation and deposition of colloidal particles in various natural and industrial processes such as water purification, mineral processing, filtration, transport of microorganisms in groundwater and medical applications.

摘要CTS-9820795M。Borkovec，Clarkson U，提出了同时静态和动态光散射来测量二元胶体混合物中的异相聚集速率常数。实验研究将在羧基(A)和两性离子(B)胶乳粒子上进行。所有二聚体(AA、AB和BB)的绝对形成速率常数将作为溶液pH和离子强度的函数来测量。实验数据将与Derjagurin，Landau，Vervey和Overbeek(DLVO)的理论进行比较。作者将研究DLVO理论在粒子-粒子相互作用势中对小间距势垒(1 Nm)的有效性限制，其中该理论显然是无效的。拟议的工作与各种自然和工业过程中胶体颗粒的稳定、凝聚和沉积有关，这些过程包括净水、选矿、过滤、地下水微生物的运输和医疗应用。