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Characterization of lipid-templated silica and hybrid thin film mesophases by grazing incidence small-angle X-ray scattering.


ABSTRACT: 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.

SUBMITTER: Dunphy DR 

PROVIDER: S-EPMC2736351 | biostudies-literature | 2009 Aug

REPOSITORIES: biostudies-literature

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Characterization of lipid-templated silica and hybrid thin film mesophases by grazing incidence small-angle X-ray scattering.

Dunphy Darren R DR   Alam Todd M TM   Tate Michael P MP   Hillhouse Hugh W HW   Smarsly Bernd B   Collord Andrew D AD   Carnes Eric E   Baca Helen K HK   Köhn Ralf R   Sprung Michael M   Wang Jin J   Brinker C Jeffrey CJ  

Langmuir : the ACS journal of surfaces and colloids 20090801 16


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 w  ...[more]

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