The relatively new tendency in the nanotechnology of inorganic particles is a development of technologies based on the organic-inorganic hybrids, which allow to achieve of the inorganic mesoporous objects of macroscopic dimensions ( the so-called monoliths). Calcination of the above mentioned hybrids may lead to the hierarchically ordered mesoporous inorganic materials from nanoorganisation of a single pore to the assembly of pores and finally to the macroscopic morphology. Ozin calls materials that are controllable on all of these length scales "panoscopic materials" [1].
The synthesis and the analysis of microstructures of organic-inorganic hybrids as well as inorganic structures after their calcination are the goal of this work. Two classes of hybrid organic - inorganic materials were considered. Class I is characterized by inorganic molecules embedded in polymer matrix. Class II involves materials displaying strong interactions between inorganic and organic components. Here a new molecular precursor is first synthesized and then used in a conventional sol-gel process to get the hybrid material. Precursor of the inorganic phase was a complex of the (tetra-isopropyl)orthotitanate with the methacrylic acid. The mesomorphic polymer (2-hydroxypropyl)cellulose (HPC) was used as self-organization matrix, around which there were formed "in situ" nanoparticles phase of TiO2.
As a result of our investigations we obtained:
(a)-organic-inorganic nanocomposites of HPC/TiO2, (b)-mesoporous and nanocrystalline particles diameter 200-500nm of TiO2 (anatas) as well as solid supported mesoporous and transparent thin films of TiO2, (c)-wires of nanocrystalline TiO2 (30mm x 1cm), showing high optical anisotropy.
References
[1] G.A. Ozin , Chem. Commun., (6), 419, (2000)
Acknowledgement
This research has been financially supported by the State Committee for Scientific Research (KBN) under contract No. PBZ-KBN 095/ T08

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