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One-dimensional alignment of SBA-15 films in microtrenches
Hirofumi Daiguji1, Naoya Tatsumi, Sho Kataoka
1Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan. daiguji@k.u-tokyo.ac.jp
Langmuir : the ACS Journal of Surfaces and Colloids
|October 1, 2009
Summary
This study synthesized SBA-15 thin films in microtrenches, revealing pore alignment influenced by capillary forces and a low-temperature oxide (LTO) layer. The LTO layer altered pore orientation in the film
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- SBA-15 materials are mesoporous silicas with ordered pore structures.
- Controlling pore morphology in thin films is crucial for applications like catalysis and separations.
- Microtrench fabrication offers a platform for templated material synthesis.
Purpose of the Study:
- To investigate the synthesis of SBA-15 thin films within microtrenches.
- To analyze the influence of microtrench surface modification (LTO layer) on pore alignment.
- To understand the role of capillary forces and precursor solution parameters on pore structure.
Main Methods:
- Dip-coating synthesis of SBA-15 thin films.
- Utilized silicon microtrenches and silicon microtrenches with a deposited low-temperature oxide (LTO) layer.
- Characterization of pore alignment using microscopy techniques (implied).
Main Results:
- Pore alignment along the concave surface in the upper film region due to capillary forces.
- Tangential pore alignment in silicon microtrenches and normal alignment in LTO-coated microtrenches in the lower film region.
- The LTO layer suppressed substrate-initiated growth and promoted vapor-liquid interface growth.
Conclusions:
- Capillary forces dictate pore alignment in the upper film regions.
- The LTO layer significantly modifies pore orientation in the lower film regions by altering growth mechanisms.
- Precursor solution composition and relative humidity are critical factors influencing pore alignment.
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