COLL 325 |
| Xiaohong Shari Li1, Glen E. Fryxell2, R. Shane Addleman3, Suresh Baskaran2, Rick Williford2, Chongmin Wang4, Jerome C Birnbaum2, and Christopher Coyle2. (1) Material Chemistry and surface reseach group, Pacific Northwest National Laboratory, K2-44, P.O. BOX 999, Richland, WA 99352, (2) Pacific Northwest National Laboratory, Richland, WA 99352, (3) Environmental Technology Division, Pacific Northwest National Laboratory, Richland, WA 99352, (4) Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P. O. Box 999, K8-93, Richland, WA 99352 |
| Mesoporous SiO2 thin films were synthesized by sol-gel processing using non-ionic alkyl poly (ethylene oxide) surfactants (PEO) and poly (alkylene oxide) block copolymers (PEO-PPO-PEO) as templates. The films were prepared by spin-coating on Si wafer substrates, followed by calcination. Nitrogen sorption, X-ray diffraction and TEM were used to characterize the porosity, pore size and pore structure. The effect of film pore structures on the properties such as hydrothermal stability, dielectric constant and elastic modulus was studied. It was found that films prepared using PEO surfactants had disordered structures with small pores, thinner walls, and the films prepared using poly block copolymers showed ordered structures with larger pores and thicker walls; which resulted in films with better hydrothermal stability and mechanical integrity. |
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Nanoscience and Nanotechnology
8:30 AM-11:45 AM, Tuesday, March 30, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |