On the hydrothermal stability of mesoporous aluminosilicate MCM-48 materials

Article Abstract:

Aluminosilicate MCM-48 materials with Si/A1 ratio between 4 and 50 are prepared through direct mixed-gel synthesis, and their hydrothermal stability in boiling water and steam is investigated using a variety of techniques including powder XRD, N2 sorption studies, and element analysis. The findings show that it is possible to prepare A1-MCM-48 materials with good structure ordering and hydrothermal stability by careful choice of the A1 content.

Observations, Chemical synthesis, Chemical properties, Hydrothermal fluids

---

High-resolution multinuclear NMR structural study of binary aluminosilicate and other related glasses

Article Abstract:

The short-range atomic structure of homogeneous binary SiO2-Al2O3 glasses with 0.4 to up to 12.0 wt per cent Al2O3 are studied using high resolution (super 27)Al, (super 29)Si, and (super 17)O NMR spectroscopic techniques. The high-resolution (super 27)Al NMR results on phase-separated glasses with Al2O3 contents ranging between 20 and 40 wt percent are reported.

Nuclear magnetic resonance spectroscopy, Electronic structure, Atomic structure

---

Association properties of diblock copolymers of ethylene oxide and 1,2-butylene oxide in aqueous solution. Copolymers with oxyethylene-block lengths in the range 100-400 chain units

Article Abstract:

It has been possible to obtain micelle properties and sol-gel curves for four oxyethylene/oxybutylene diblock copolymers: E96B18, E184B18, E315B17 and E398B19. At room temperature, hard gels were formed in the concentration range 3.5 wt % to 8 wt % copolymer depending on E-block length.

Block copolymers

Similar abstracts:

• Abstracts: Structural relation properties of hydrothermally stable functionalized mesoporous organosilicas and catalysis
• Abstracts: Investigation of the morphology of the mesoporous SBA-16 and SBA-15 materials. Modification of MCM-48-, SBA-15-, MCF-, and MSU-type mesoporous silicas with transition metal oxides using the molecular designed dispersion method
• Abstracts: Preparation and properties of silica coated cobalt nanoparticles. A nonisothermal study of the kinetics of the nanoporosity elimination in sonogels-derived silica xerogels
• Abstracts: Electronic and chemical properties of nanostructured cerium dioxide doped with praseodymium. A combined quantum chemical statistical mechanical simulation of the hydration of Li+, Na+, F-, and Cl-
• Abstracts: A study of the microstructural and diffusion properties of poly(vinyl alcohol) cryogels containing surfactant supramolecular aggregates

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