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Size and Shape Dependence of Organo‐Interconnected Silsesquioxanes through Hydrolysis‐Condensation Reaction Conditions: Nanotubes, Spheres and Films

2007; Wiley; Volume: 17; Issue: 14 Linguagem: Inglês

10.1002/adfm.200600670

1616-3028

Benoît P. Pichon, M. Wong Chi Man, Philippe Dieudonné, Jean‐Louis Bantignies, Catherine Bied, Jean‐Louis Sauvajol, Joël J. E. Moreau,

Aerogels and thermal insulation

Abstract A tris‐silylated urea‐based compound, 1,3,5‐tris(triethoxysilylpropylureido)benzene has been synthesized. Hybrids materials with different shapes (films, spheres and tubes) are obtained upon base‐catalyzed hydrolytic condensation of this compound. A self‐templating process is demonstrated using electron microscopy (SEM and TEM) and X‐ray diffraction (SAXS and WAXS) techniques. We show the formation of nanometer size hollow tubes according to the size of the self‐templating crystalline precursor. The possibility for this self‐templating to occur is due to a favored dissolution of the self‐assembled molecules of the precursor in a preferential direction parallel to the cross‐section of the crystals.