Physical Chemistry of Sol-Gel Materials Symposium Held during the 213th National Meeting of the American Chemical Society Held in Anaheim, California on March 21-25, 1999
Abstract
Sol-gel processing has emerged as the preferred route to prepare a variety of highly organized porous and composite material. This talk will present a brief overview of "classical" sol-gel processing followed by a discussion of new approaches that combine sol-gel processing with various templating and self-assembly strategies, enabling control of pore size and pore connectivity and offering the possibility to combine materials into ordered composite architectures. On the molecular scale, "solvent templating" is used to control pore size in the range 0.3 - 0.7-nm needed for applications such as molecular sieving membranes. On the mesoscale, evaporation-reduced self-assembly of surfactant/silica mesophases is used to prepare continuous, mesoporous films. By using micelles to spatially partition aad organize organic precursors (within the hydrophobic micellar interiors) and inorganic precursors (surrounding the hydrophilic micellar exteriors) further self-assembly into organic and inorganic precursors into various liquid crystaline mesophases allows simultaneous organization approach can be extended to form nanocomposite constructions. The evaporation-induced self-easily nanostructured particles during aerosol processing and can be generalized to other composite architectures and other materials combinations (e.g. metalloxide). Through co-organization of photosensitive molecules or polymers within ordered mesophases, we can achieve optically-mediated changes in mesostructural order, providing the first evidence of nanostructural lithography. -
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2000
- Accession Number
- ADA376790
Entities
People
- Bruce Dunn
Organizations
- University of California, Los Angeles