Hybrid organic-inorganic silicate

Keywords hybrid organic-inorganic silicate, silica, porous particles... 

Metalloporphyrinosilicas as a new class of hybrid organic-inorganic materials were prepared by polymerization of 3- er -butyl-5-vinylsalicylaldehyde with styrene and divinylbenzene and used as selective biomimetic oxidation catalyst.27 Synthesis and structural characterization of rare-earth bisfdimethyl-silyl)amides and their surface organometallic chemistry on mesoporous silicate MCM-41 have been reported.28... 

Remarkably analogous findings have been established in recent years from the study of a number of catalytic species entrapped in sol-gel glasses. In particular, molecular entrapment in hybrid organic-inorganic ceramic matrices such as organically modified silicates resulted in... 

Remarkably, in 2002, Inagaki and co-workers reported that, starting from 1,2-bis (triethoxysilyl)benzene as a siliceous precursor, mesoporous benzene-silica with crystal-like pore walls (Ph-PMO) can be prepared (Fig. 2) [35]. Owing to their crystallinity, these new hybrid organic-inorganic materials were much more stable in water than the amorphous mesoporous silica-supported sulfonic sites described above [36-39]. 

Layered silicates dispersed as a reinforcing phase in polymer matrix are one of the most important forms of hybrid organic-inorganic nanocomposites. MMT, hectorite, and saponite are the most commonly used layered silicates. Layered silicates have two types of structure tetrahedral-substituted and octahedral substituted figure 6. In the case of tetrahedrally substituted layered silicates the negative charge is located on the surface of silicate layers, and hence, the polymer matrices can react interact more readily with these than with octahedrally-substituted material. 

Wang, Z., Lan. T. and Pinnavaia,T. (1996), Hybrid organic-inorganic nanocomposites formed from an epoxy polymer and a layered silicate acid (magadiite). Chemistry of Materials, Vol. 8, pp. 2200-2204. 

Alexandre M and Dubois P (2000) Polymer-layered silicate nanocomposites preparation, properties and uses of a new class of materials. Mater Sci Eng 28 1-63. Sanchez C, Lebeau B, Chaput F and Boilot J-P (2003) Optical properties of functional hybrid organic-inorganic nanocomposites, Adv Mater 15 1969-1994. 

F. Hoffmann, M. Cornelius, J. Morell, M. Froba, Silica-based mesoporous organic-inorganic hybrid materials on the basis of silicates. Angew. Chem. Int. Ed. 45 (2006) 3216. 

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