Avtor/Urednik		Moreaud, Maxime; Revel, Renaud; Jeulin, Dominique; Morard, Vincent
Naslov		Size of boehmite nanoparticles by TEM images analysis
Tip		članek
Vir		Image Anal Stereol
Vol. in št.		Letnik 28, št. 3
Leto izdaje		2009
Obseg		str. 187-93
Jezik		eng
Abstrakt		Transition aluminas, and especially the gamma type, are largely used as catalyst supports in refining and petrochemicals. Most studies focus on properties resulting from material texture and casting (specific surface, porous volume, pore shape and diameter). However, surface properties of alumina should be considered as well, as the catalytic activity is tightly related to the structure of exposed crystalline faces. As y alumina results from controlled thermal treatment of boehmite y-AlOOH by a topotactic transformation, the nature of exposed crystalline planes is related to the starting material. Therefore, the synthesis of the oxihydroxide gamma-A1OOH, and especially size and shape of these particles, is critical in determining the relevant surface properties. Unlike often aggregated alumina, boehmite nanoparticles can be observed by TEM. Analysis of these TEM images can be performed to esrimate the size of the boehmite nanoparticles. Information about morphology of the nanoparticles is obtained by the analysis of the covariance, modeling micrographs by a dilution model.
Deskriptorji		PARTICLE SIZE MATERIALS TESTING IMAGE PROCESSING, COMPUTER-ASSISTED MICROCHEMISTRY MICROSCOPY, ELECTRON