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.

Titanium compounds, Chemical synthesis, Inorganic compounds

---

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.

Science & research, Research, Continuum mechanics

---

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.

Honeycomb structures, Honeycomb structures (Materials)

Similar abstracts:

• Abstracts: Synthesis and X-ray structure of dumb-bell-shaped C120. Anomalous solubility behavior of C60. Curling and closure of graphitic networks under electron-beam irradiation
• Abstracts: Structure of a 14-3-3 protein and implications for coordination of multiple signalling pathways. The role of turns in the structure of an alpha-helical protein
• Abstracts: Height distribution of birds recorded by collisions with civil aircraft. Lethal control of red-winged blackbirds to manage damage to sunflower: an economic evaluation
• Abstracts: Structure of mitochondrial ADP/ATP carrier in complex with carboxyatractyloside. The whole tooth
• Abstracts: Biting the bullet: in search of South America's giant ant. Condorland?

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.