Aluminosilicate mesoporous molecular sieve MCM-48

Article Abstract:

The extensive industrial applications of mesoporous silicate molecular sieves spurred scientific investigations into the synthesis and characterization of aluminosilicate MCM-48. The MCM-48 data were compared with the MCM-41 samples. The aluminum specimens were gathered from aluminum chloride hexahydrate and aluminum sulfate, while silica was derived from tetraethyl orthosilicate. X-ray diffraction and diffuse reflectance Fourier transform infrared spectroscopy were performed. Similarities were observed in the nitrogen adsorption/desorption isotherms of both MCM-48 and MCM-41.

Aluminum silicates, Molecular sieves

---

ESCA studies of yttrium aluminum garnets

Article Abstract:

The influence of doping on the host crystal structure of yttrium aluminum garnet (YAG) was investigated using x-ray photoelectron spectroscopy. The consequences of doping were observed indirectly through an analysis of the peaks and variations of the chemical shifts of the main ions forming the YAG crystal. The presence of only one independent oxygen ion was proven, even though the O(1s) spectra of all YAG systems exhibit two readily discerned peaks. This dichotomy is linked to the possible polarization of the oxygen valence electron density between aluminum and yttrium.

Usage, X-ray spectroscopy, Yttrium, Aluminum compounds, Valence, Valence (Chemistry), Garnet

---

X-ray diffraction and 13C solid-state NMR studies of the dimethytlformamide solvate of tetra(C-undecyl)calix[4]resorcinarene

Article Abstract:

A new study uses NMR and XRD to investigate the crystal and molecular structure of tetra(C-undecyl)calix[4]resorcinaren cocrystallized with dimethylformamide.

Crystallography

Similar abstracts:

• Abstracts: Characterization of aluminophosphate-based tubular mesoporous molecular sieves. Structure of graphite oxide revisited
• Abstracts: Applications to nonspherical molecules. Pure noble gases and their mixtures. Theory
• Abstracts: Amorphous microporous titania modified with platinum(IV) chloride - a new type of hybrid photocatalyst for visible light detoxification
• Abstracts: Mutual synchronization of molecular turnover cycles in allosteric enzymes. Coherent intramolecular dynamics of enzymic reaction loops in small volumes
• Abstracts: BASF global ag moves stateside. Rohm and Haas. Aventis set to deliver

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