Heteropolyacids Aided Rapid and Convenient Syntheses of Highly Ordered MCM-41 and MCM-48: Exploring the Accelerated Process by29Si MAS NMR and Powder X-Ray Diffraction Studies.

ChemInform ◽  
2003 ◽  
Vol 34 (2) ◽  
Author(s):  
Kausik Mukhopadhyay ◽  
Anirban Ghosh ◽  
Rajiv Kumar
Keyword(s):  
Mas Nmr ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mcm 41

Guest Molecules Confined in Amphipathic Crystals as Revealed by X-ray Diffraction and MAS NMR†

2009 ◽  
Vol 9 (7) ◽  
pp. 2999-3002 ◽  
Author(s):  
Angiolina Comotti ◽  
Silvia Bracco ◽  
Piero Sozzani ◽  
Samuel M. Hawxwell ◽  
Chunhua Hu ◽  
...  
Keyword(s):  
Mas Nmr ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray

Diffuse wall structure and narrow mesopores in highly crystalline MCM-41 materials studied by X-ray diffraction

1997 ◽  
Vol 93 (1) ◽  
pp. 199-202 ◽  
Author(s):  
Karen J. Edler ◽  
Philip A. Reynolds ◽  
John W. White ◽  
David Cookson
Keyword(s):  
Wall Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mcm 41

scholarly journals ZnFe2O4-TiO2Nanoparticles within Mesoporous MCM-41

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Aidong Tang ◽  
Yuehua Deng ◽  
Jiao Jin ◽  
Huaming Yang
Keyword(s):  
Sol Gel ◽  
Rutile Phase ◽  
Band Gap Energy ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Agglomeration Of Nanoparticles ◽  
Adsorption Desorption ◽  
Mcm 41

A novel nanocomposite ZnFe2O4-TiO2/MCM-41 (ZTM) was synthesized by a sol-gel method and characterized through X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), N2adsorption-desorption, Raman spectroscopy, and ultraviolet visible (UV-vis) spectrophotometry. The results confirmed the incorporation of ZnFe2O4-TiO2nanoparticles inside the pores of the mesoporous MCM-41 host without destroying its integrity. ZnFe2O4nanoparticles can inhibit the transformation of anatase into rutile phase of TiO2. Incorporation of ZnFe2O4-TiO2within MCM-41 avoided the agglomeration of nanoparticles and reduced the band gap energy of TiO2to enhance its visible light photocatalytic activity. UV-vis absorption edges of ZTM nanocomposites redshifted with the increase of Zn/Ti molar ratio. The nanocomposite approach could be a potential choice for enhancing the photoactivity of TiO2, indicating an interesting application in the photodegradation and photoelectric fields.

ChemInform Abstract: X-Ray Diffraction, EPR, and 6Li and 27Al MAS NMR Study of LiAlO2-LiCoO2 Solid Solutions.

ChemInform ◽  
2010 ◽  
Vol 29 (17) ◽  
pp. no-no
Author(s):  
R. ALCANTARA ◽  
P. LAVELA ◽  
P. L. RELANO ◽  
J. L. TIRADO ◽  
E. ZHECHEVA ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Mas Nmr ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nmr Study ◽  
27Al Mas Nmr

Characterization of aluminosilicate (mullite) precursors prepared by a mechanochemical process

1998 ◽  
Vol 13 (8) ◽  
pp. 2184-2189 ◽  
Author(s):  
J. Temuujin ◽  
K. Okada ◽  
K. J. D. MacKenzie
Keyword(s):  
Heat Treatment ◽  
Nmr Spectra ◽  
Spinel Phase ◽  
Mas Nmr ◽  
X Ray Diffraction ◽  
Hydrated Alumina ◽  
X Ray ◽  
New Si ◽  
Grinding Time

Aluminosilicate precursors were prepared by mechanochemical treatment of gibbsitesilica gel mixtures. The effect of grinding on their structure and thermal behavior has been examined by 27Al and 29Si MAS NMR, x-ray diffraction (XRD), differential thermal analysis-thermogravimetry (DTA-TG), and Fourier transform infrared (FTIR). After 8 h grinding, the hydrated alumina was completely changed to an amorphous phase which showed a new exothermic DTA peak at about 980 °C due to the formation of γ–Al2O3 or spinel phase. This behavior was related to changes in the Al and Si environments, as deduced from the MAS NMR spectra. With increased grinding time, some 4-coordinated Al appears, together with an Al resonance at about 30 ppm. Simultaneously, a new Si resonance appears at about −90 ppm, indicating a greater degree of homogeneity in the ground samples. Mullite crystallizes at 1200 °C from samples ground for 8–20 h, its XRD intensity increasing with increased milling times, in agreement with the NMR, DTA, and FTIR data. Changes in the Al and Si environments during heat treatment, as reflected by the NMR spectra, are also reported.

An X-ray Diffraction and MAS NMR Study of the Thermal Expansion Properties of Calcined Siliceous Ferrierite

2003 ◽  
Vol 125 (14) ◽  
pp. 4342-4349 ◽  
Author(s):  
Ivor Bull ◽  
Philip Lightfoot ◽  
Luis A. Villaescusa ◽  
Lucy M. Bull ◽  
Richard K. B. Gover ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Mas Nmr ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nmr Study

Determination of the Lamellar Phase Content in MCM-41 Using X-ray Diffraction, Nitrogen Adsorption, and Thermogravimetry

2000 ◽  
Vol 104 (7) ◽  
pp. 1581-1589 ◽  
Author(s):  
Michal Kruk ◽  
Mietek Jaroniec ◽  
Yong Yang ◽  
Abdelhamid Sayari
Keyword(s):  
Nitrogen Adsorption ◽  
Lamellar Phase ◽  
Phase Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mcm 41
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