Characterization of Lipid-Templated Silica and Hybrid Thin Film Mesophases by Grazing Incidence Small-Angle X-ray Scattering
| Autor: | Michael P. Tate, Ralf Köhn, Jin Wang, Eric C. Carnes, Michael Sprung, Bernd M. Smarsly, Helen K. Baca, Darren R. Dunphy, C. Jeffrey Brinker, Todd M. Alam, Hugh W. Hillhouse, Andrew D. Collord |
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| Rok vydání: | 2009 |
| Předmět: |
Magnetic Resonance Spectroscopy
Materials science Surface Properties Silicon dioxide Analytical chemistry Article chemistry.chemical_compound X-Ray Diffraction Scattering Small Angle Spectroscopy Fourier Transform Infrared Electrochemistry General Materials Science Phospholipids Spectroscopy Molecular Structure Small-angle X-ray scattering X-Rays Mesophase Surfaces and Interfaces Silicon Dioxide Condensed Matter Physics Lipids Silsesquioxane Nanostructures chemistry Chemical engineering Siloxane Grazing-incidence small-angle scattering lipids (amino acids peptides and proteins) Self-assembly Hybrid material |
| Zdroj: | Langmuir. 25:9500-9509 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | The nanostructure of silica and hybrid thin film mesophases templated by phospholipids via an evaporation-induced self-assembly (EISA) process was investigated by grazing-incidence small-angle X-ray scattering (GISAXS). Diacyl phosphatidylcholines with two tails of 6 or 8 carbons were found to template 2D hexagonal mesophases, with the removal of lipid from these lipid/silica films by thermal or UV/O3 processing resulting in a complete collapse of the pore volume. Monoacyl phosphatidylcholines with single tails of 10–14 carbons formed 3D micellular mesophases; the lipid was found to be extractable from these 3D materials, yielding a porous material. In contrast to pure lipid/silica thin film mesophases, films formed from the hybrid bridged silsesquioxane precursor bis(triethoxysilyl)ethane exhibited greater stability toward (both diacyl and monoacyl) lipid removal. Ellipsometric, FTIR, and NMR studies show that the presence of phospholipid suppresses siloxane network formation, while actually promoting condensation reactions in the hybrid material. 1D X-ray scattering and FTIR data were found to be consistent with strong interactions between lipid headgroups and the silica framework. |
| Databáze: | OpenAIRE |
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