کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1465152 | 989682 | 2007 | 5 صفحه PDF | دانلود رایگان |
The porosity, inter-particulate and inter-agglomerate, of γ-Al2O3 nanopowders obtained by the freeze-drying method has been studied. Homogeneous spherical granules with diameters ranging from 1 to 100 μm 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 inter-particulate 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.
Journal: Ceramics International - Volume 33, Issue 7, September 2007, Pages 1165–1169