Rectorite Pillared with Ce-Modified Aluminum Oxide

1994 ◽  
Vol 371 ◽  
Author(s):  
Jianxin Wu ◽  
Edward F. Rakiewicz ◽  
Robert R. Gatte
Keyword(s):  
Thermal Stability ◽  
Aluminum Oxide ◽  
Mas Nmr ◽  
Cerium Nitrate ◽  
Interlayer Distance ◽  
Nmr Studies ◽  
Adsorption Analysis ◽  
Argon Adsorption ◽  
Thermal Stability Of

AbstractRectorite clay was pillared with an Al/Ce-cluster pillaring agent made from aluminum chlorhydrol and cerium nitrate. The resulting product had an interlayer distance of 15.7 Å, which was significantly larger than the interlayer distance obtained using conventional aluminum chlorhydrol as the pillaring agent (8.4 Å). Argon adsorption analysis indicates that the pores of the AL/Ce-cluster pillared rectorite are non-uniform, with pore diameters ranging from 5 to 16Å. 29Si MAS NMR studies showed that calcining the natural rectorite changes the silicon environment, while the pillared rectorite clays are much more resistant to such changes upon calcination. It is suggested that pillaring reactions enhance the thermal stability of the rectorite by stabilizing the local silicon environment in the clay.

scholarly journals Thermal stability of plasma-nitrided aluminum oxide films on Si

2004 ◽  
Vol 84 (1) ◽  
pp. 97-99 ◽  
Author(s):  
K. P. Bastos ◽  
R. P. Pezzi ◽  
L. Miotti ◽  
G. V. Soares ◽  
C. Driemeier ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Aluminum Oxide ◽  
Oxide Films ◽  
Thermal Stability Of

Synthesis and Characteristic of Hierarchically Porous Zirconium Oxide Doped with Yttrium

2007 ◽  
Vol 121-123 ◽  
pp. 5-8 ◽  
Author(s):  
H.R. Chen ◽  
Jian Lin Shi ◽  
Jian Hua Gao ◽  
L. Li ◽  
D.S. Yan
Keyword(s):  
Thermal Stability ◽  
Zirconium Oxide ◽  
Nitrogen Adsorption ◽  
Macroporous Structure ◽  
Hierarchically Porous ◽  
Adsorption Analysis ◽  
Porous Zirconia ◽  
Ordered Macroporous ◽  
Structural Characterizations ◽  
Thermal Stability Of

A novel and thermally stable hierarchically porous yttrium doped zirconia material with crystallized framework has been synthesized in a facile process. XRD, nitrogen adsorption analysis, FESEM, FETEM, were used for the structural characterizations. This novel hierarchically porous zirconia shows a well-defined ordered macroporous structure, a broad distributed mesoviods, and a very uniform mesoporous pore-distribution. Small amount of yttrium can be helpful to increase the thermal stability of the prepared hierarchically porous zirconium oxide.

Mechanisms for the enhancement of the thermal stability of organic thin films by aluminum oxide capping layers

2006 ◽  
Vol 21 (2) ◽  
pp. 455-464 ◽  
Author(s):  
S. Sellner ◽  
A. Gerlach ◽  
F. Schreiber ◽  
M. Kelsch ◽  
N. Kasper ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Aluminum Oxide ◽  
Elevated Temperatures ◽  
Organic Thin Films ◽  
Organic Films ◽  
Capping Layer ◽  
Ambient Gases ◽  
Complementary Techniques ◽  
Thermal Stability Of

We present a detailed study of the thermal stability of organic thin films of diindenoperylene encapsulated by sputtered aluminum oxide layers. We studied the influence of capping layer thickness, stoichiometry, and heating rate on the thermal stability of capped films and their eventual breakdown. Under optimized encapsulation conditions (thick and stoichiometric capping layer), the organic films desorb only at temperatures 200 °C above the desorption of the uncapped film. Moreover, the capped organic films retain their crystalline order at these elevated temperatures, whereas they would normally (i.e., uncapped) be in the gas phase. This study therefore also shows a way of studying organic materials under temperature conditions normally inaccessible. Considering results from complementary techniques, we discuss possible scenarios for the eventual breakdown. The results have implications for the performance and long-term stability of organic devices for which stability against elevated temperatures as well as against exposure to ambient gases is crucial.

Thermal stability of aluminum oxide nanoparticles: role of oxygen concentration

2019 ◽  
Vol 6 (7) ◽  
pp. 1701-1706 ◽  
Author(s):  
Max Ramírez ◽  
Rafael I. González ◽  
Samuel E. Baltazar ◽  
Javier Rojas-Nunez ◽  
Sebastián Allende ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Aluminum Oxide ◽  
Oxygen Concentration ◽  
Oxide Nanoparticles ◽  
Aluminum Oxide Nanoparticles ◽  
Oxygen Incorporation ◽  
Thermal Stability Of

Oxygen incorporation yields an Al2O3 nanoparticle with a Janus-like morphology.

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