Nano porous structures adsorption materials

The metal oxides prepared by conventional baking or by the CVD method are, in general, chemically stable, crystalline materials, and show excellent mechanical, electrical, optical, and physical properties. Flexible porous gel films obtained by the surface sol-gel process are totally different. In this chapter, we described a new preparative method for ultrathin metal oxide films by stepwise adsorption of various metal alkoxides. We named this method the surface sol-gel process. Structural characterization of the gel films thus obtained, the electrical property, and formation of nano-composites with organic compounds, were also explained. The soft porous gel contains many active hydroxyl groups at the surface and interior of the film. This facilitates adsorption of organic compounds, and consequent preparation of ultrathin metal oxide/polymer nano-composite films and organization of functional small molecules. In the nano-composites, proper selection of polymer components leads to the design of new materials with unique electrical, optical, and chemi-... 

A new class of nano-sized large porous titanium silicate (ETAS-10 ) and aluminum-substituted ETAS-10 with different Al203/ri02 ratio were successfully synthesized and applied to remove heavy metals in particular Pb and Cd (see Table 7). Since tetravalent Ti is coordinated by octahedral structure, it creates two negative charges that must be normally balanced by two monovalent cations. This leads to a great interest in ion exchange or adsorption property of this material [391],... 

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