Synthesis and structure of a layered titanosilicate catalyst with five-coordinate titanium
Article Abstract:
The non-centrosymmetric, layered titanosilicate solid, Na4Ti2Si8O22.4H2O (JDF-L1), contains square pyramids of TiO5 in which the Ti(IV) is five-coordinated. The layers in JDF-L1 have two orthogonal channel systems composed of small cage-like units with eight Si and two Ti sites. Tetrabutyl orthotitanate, sodium hydroxide, fumed silica, aqueous ammonia, tetrabutylammonium bromide and aqueous hydrogen peroxide are necessary for synthesizing the titanosilicate. JDF-L1 exhibits ion-exchange properties due to the exchangeable alkali metal ions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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The breakdown of continuum models for mechanical contacts
Article Abstract:
Molecular simulations are used to test the limits of contact mechanisms under ideal conditions. Findings indicate that atomic discreteness within the bulk of solids does not have a significant effect, but the atomic-scale surface roughness leads to dramatic deviations form continuum theory and these variations are likely to effect continuum predictions for many macroscopic rough surfaces.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Controlling molecular deposition and layer structure with supramolecular surface assemblies
Article Abstract:
The concepts of supramolecular organization is applied to two-dimensional assemblies on surfaces stabilized by hydrogen bonding or metal co-ordination. The open honeycomb network is described to act as two-dimensional array of large pores of sufficient capacity to accommodate several large molecules.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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