Auto-organization of Nanostructured Organic−Inorganic Hybrid Xerogels Prepared by Sol−Gel Processing: The Case of a 'Twisted' Allenic Precursor

Autor:	Robert J. P. Corriu, Frédéric Lerouge, Geneviève Cerveau, and Eric Framery
Rok vydání:	2004
Předmět:	Diffraction chemistry.chemical_classification Birefringence Materials science General Chemical Engineering Mesogen General Chemistry Polymer Chemical engineering chemistry Liquid crystal Materials Chemistry Organic chemistry Anisotropy Hybrid material Sol-gel
Zdroj:	Chemistry of Materials. 16:3794-3799
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm049061c
Popis:	Nanostructured hybrid materials prepared by sol−gel hydrolysis−polycondensation of the precursor 1,3-bis(propyltrimethoxysilyl)-1,3-diphenylallene P having a bulky rigid and twisted core with two short flexible arms exhibited a self-organization evaluated by birefringence measurements (micrometric scale) and X-ray diffraction studies (nanometric scale). These observations show that the auto-organization of hybrid materials is not limited to rigid-rod or mesogenic spacers. It appears as a more general phenomenon. The twisted geometry of the organic group induced an anisotropic organization, the morphology of which was unprecedented and different from the one observed with the linear or mesogenic hybrid materials previously studied. Moreover, the birefringence pictures were also different from those observed with liquid crystals. In some cases unprecedented wavy parallel cracks showed the extension of the organization over the millimetric scale. It is the same for the X-ray diffraction. In all the cases pre...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f4f54e2fdabd7dfb9e04f8e57b59617c https://doi.org/10.1021/cm049061c Zobrazit plný text záznamu