1. Ordered Inorganic-Organic Composites & Porous Solids: Interdisciplinary Materials Science & Engineering Opportunities Dr. Brad Chmelka Department of Chemical Engineering University of California Santa Barbara, CA 93106 Cal Poly, San Luis Obispo, January 23, 2002

2. Biominerals: Strong natural structural materials T. Schäffer et al., Chem. Mater. 9, 1731 (1997 ) Scanning electron micrograph Oriented single crystals of CaCO 3 Shell exterior: 99% calcite 1% organic 1000 times stronger than polycrystalline CaCO 3 Interior nacre: 99% aragonite 1% organic mother-of-pearl Abalone shell: Protein-directed crystallization

3. Self-Assembled Inorganic-Organic Materials Nanoscopic, 10 -9 m Mesoscopic Microscopic, 10 -6 m Macroscopic

4. New Technology Opportunities & Applications Functionalized Porous Powders and Fibers  catalysts, separation & filtration media, adsorbents Films and Coatings  functional membranes, barriers, packaging, fuel cells Electronic Materials  low-dielectric-constant films and monoliths Optical Materials  lasers, waveguides, optical limiters, optical interconnects, photonic crystals Sensors  chemical and biosensors

5. SBA-15 20 nm 30 nm 25 nm 4.7 nm6.0 nm 20.0 nm 26.0 nm D. Zhao et al., Science, 279, 548 (1998) P. Yang et al., Nature, 396, 152 (1998) SiAlO 3.5 Si 2 AlO 5.5 Al 2 TiO 5 ZrTiO 4 SiTiO 4 ZrW 2 O 8 ZrO 2 TiO 2 Nb 2 O 5 Ta 2 O 5 WO 3 SnO 2 HfO 2 Al 2 O 3 SiO 2 Ge 2 O 3 V2O5V2O5 ZnO x CdO x InO x SbO x MoO x ReO x NiO x MnO x CrO x CuO x Non-oxidic systems Semiconductors Hexagonal SBA-15: uniform, tunable mesoporous oxide arrays

6. 50 nm Incorporation of Optical Functionalities Organic Dyes Conjugated Polymers Organometallics DNA Semiconducting Quantum Dots Nanowires Inorganic Charge Transfer Rare Earth Complexes Enzymes, e.g., organophosphorus hydrolase N NO 2 O In transparent mesoporous solids In transparent composites