Formation of Chemically Modified Ceramic Membranes and TheirTransport Characterization

化学改性陶瓷膜的形成及其传输特性

• 批准号: 9022622
• 负责人: William Koros
• 金额: $ 15万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-01 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9022622&HistoricalAwards=false
• 关键词: Formation; Chemically; Modified; Ceramic; Membranes

This project studies ceramic membranes modified by a chemical vapor deposition technique. The alumina precursor materials from Alcoa are asymmetric, with an alpha-alumina support and a 5 >m gamma-alumina skin layer. Their minimum pore dimension (40 >) makes them inappropriate for fine molecular-sieving separations of small molecules. A series of fluorinated silanes are used to provide precisely controlled decreases in the sizes of the slit-shaped pores of the skin layer. The proposed mechanism by which the pore modification process occurs and its reproducibilty are tested in carefully designed experiments. Studies are focused on the measurement and modeling of the fundamental transport properties of these model materials. The detailed morphology of these materials are probed by gaseous and liquid systems. The data provide new insights and allow testing theories for analyzing transport phenomena in media with pore sizes approaching molecular dimensions. The new ceramic membranes should find new applications in separations of gaseous mixtures.

本项目研究采用化学气相沉积技术对陶瓷膜进行改性。美国铝业的氧化铝前驱体材料是不对称的，具有α-氧化铝载体和5&gt；m伽马-氧化铝表层。它们的最小孔径(40；)使其不适合用于小分子的精细分子筛分。一系列氟化硅烷被用来精确控制皮肤层狭缝状毛孔的尺寸减小。所提出的孔修饰过程发生的机理及其重复性在精心设计的实验中得到了检验。研究的重点是测量和模拟这些模型材料的基本输运性质。用气态和液态体系对这些材料的详细形貌进行了研究。这些数据提供了新的见解，并为分析孔径接近分子尺寸的介质中的传输现象提供了测试理论。新型陶瓷膜有望在气体混合物分离中找到新的应用。