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Título

Porosity of freeze-dried g-Al2O3 powders

AutorTallón, Carolina; Yates, Malcolm; Moreno Botella, Rodrigo María; Nieto, María Isabel
Palabras clavePowders: chemical preparation
Porosity
Fecha de publicación2007
EditorElsevier
CitaciónCeramics International 33 (2007) 1165–1169
ResumenThe porosity, inter-particulate and inter-agglomerate, of g-Al2O3 nanopowders obtained by the freeze-drying method has been studied. Homogeneous spherical granules with diameters ranging from 1 to 100 mm have been obtained. These granules are constituted by soft agglomerates of nanoparticles. The pore volume and size distribution are a function of the freezing kinetics and the processing parameters. Mercury intrusion porosimetry results show that the powders exhibit a multimodal porosity. A mesoporosity with mean size of 10 nm, attributed to the interparticulate porosity, is practically constant, whereas the inter-agglomerate porosity (100–600 nm), strongly depends on the salt concentration, freezing rate and thermal treatment of the powders.
Versión del editorhttp://dx.doi.org/doi:10.1016/j.ceramint.2006.03.021
URIhttp://hdl.handle.net/10261/18929
DOI10.1016/j.ceramint.2006.03.021
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