By Peidong Yang
This crucial booklet studies greatly the preparative chemistry of assorted nanostructured fabrics, in addition to structural-property correlations for those new fabrics. fabrics of present curiosity, corresponding to nanocrystals, nanowires, nanotubes, porous fabrics, and composites, are comprehensively coated.
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Extra resources for Chemistry of Nanostructured Materials
Davis M. E. and Lobo R. , Zeolite and Molecular Sieve Synthesis, Chem. Mater. 4 (1992) pp. 756-768. 19. Davis M. , New Vistas in Zeolite and Molecular Sieve Catalysis, Acc. Chem. Res. 26 (1993) pp. 111-115. 20. Breck D. , Zeolite Molecular Sieves, Wiley, New York, 1974. 21. Barrer R. , Zeolites and Clay Minerals as Sorbents and Molecular Sieves, Academic Press, 1978. 22. , An Introduction to Zeolite Molecular Sieves, John Wley & Sons, 1988. 23. , Flanigen E. M. and Jansen J. , Studies in Surface Science and Catalysis, Vol.
The initial excitement of using the collective know-how that led to zeolite-based commercial catalysts to generate their mesoporous counterparts has been quickly dampened. For example, it was hoped to design a mesoporous aluminosilicate that would have all the attributes of strong acid zeolites such as USY, in addition to much enhanced accessibility to catalytic sites. Such catalysts would outperform USY for the hydrocracking of heavy oil. However, in addition to their inherent fragility, mesoporous aluminosilicates proved to be much less acidic than USY, a key requirement for breaking hydrocarbon molecules [5,8,10].
This is followed by condensation of silanol groups and formation of rigid silica walls. A related mechanism designated as (S0H+)(X-I0) was proposed to rationalize the formation of mesoporous silica under strongly acidic conditions in the presence of nonionic alkyl-ethylene oxide surfactants or poly(alkylene oxide) triblock copolymers . In this case, the protonated amphiphile molecules and the cationic silica species are supposed to assemble via a combination of electrostatic, hydrogen bonding and van der Waals interactions.