Description of consolidation forces on nanometric powders
The experiments and analyses performed included measurements of the physical properties of TiO2 powder such as the particle size, density, and consolidation. Experiments with nanometric TiO2powder of 204 nm average diameter show that, during consolidation, the adhesion of particles under normal stre...
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Brazilian Society of Chemical Engineering
2010-12-01
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doaj-d4f7881c57234c56b4984805c0bd85ce2020-11-24T21:51:01ZengBrazilian Society of Chemical EngineeringBrazilian Journal of Chemical Engineering0104-66321678-43832010-12-0127455556210.1590/S0104-66322010000400007Description of consolidation forces on nanometric powdersD. TurkiN. FatahThe experiments and analyses performed included measurements of the physical properties of TiO2 powder such as the particle size, density, and consolidation. Experiments with nanometric TiO2powder of 204 nm average diameter show that, during consolidation, the adhesion of particles under normal stress is principally due to the van der Waals force for particle radii less than 300nm and the application of external force has no effect on the cohesion of the primary particles within this range; for particle radii around 300nm to 1.0µm the cohesion of the powder system is due to plastic deformation and the application of external force change the cohesion force to a plastic deformation between the agglomerates formed under these forces. This can be observed in the arrangement of the primary particles into dispersed agglomerates with sizes greater than the individual particles. The results obtained with the nanometric TiO2 powders show a more complex behavior than the micronic powders. This behavior is related to the structure of the nanometric particles in the packed bed; the evolution of this structure is made up of individualized and spherical agglomerate shapes. It has been experimentally observed that the powder structure is not perturbed by stresses of low intensities. A development of the different forces involved in interparticle contacts is outlined. The description of these forces involved in particle cohesion will help to understand the powder cohesion under consolidation.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000400007ConsolidationInterparticle forcesNanometric powdervan der Waals forces |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. Turki N. Fatah |
spellingShingle |
D. Turki N. Fatah Description of consolidation forces on nanometric powders Brazilian Journal of Chemical Engineering Consolidation Interparticle forces Nanometric powder van der Waals forces |
author_facet |
D. Turki N. Fatah |
author_sort |
D. Turki |
title |
Description of consolidation forces on nanometric powders |
title_short |
Description of consolidation forces on nanometric powders |
title_full |
Description of consolidation forces on nanometric powders |
title_fullStr |
Description of consolidation forces on nanometric powders |
title_full_unstemmed |
Description of consolidation forces on nanometric powders |
title_sort |
description of consolidation forces on nanometric powders |
publisher |
Brazilian Society of Chemical Engineering |
series |
Brazilian Journal of Chemical Engineering |
issn |
0104-6632 1678-4383 |
publishDate |
2010-12-01 |
description |
The experiments and analyses performed included measurements of the physical properties of TiO2 powder such as the particle size, density, and consolidation. Experiments with nanometric TiO2powder of 204 nm average diameter show that, during consolidation, the adhesion of particles under normal stress is principally due to the van der Waals force for particle radii less than 300nm and the application of external force has no effect on the cohesion of the primary particles within this range; for particle radii around 300nm to 1.0µm the cohesion of the powder system is due to plastic deformation and the application of external force change the cohesion force to a plastic deformation between the agglomerates formed under these forces. This can be observed in the arrangement of the primary particles into dispersed agglomerates with sizes greater than the individual particles. The results obtained with the nanometric TiO2 powders show a more complex behavior than the micronic powders. This behavior is related to the structure of the nanometric particles in the packed bed; the evolution of this structure is made up of individualized and spherical agglomerate shapes. It has been experimentally observed that the powder structure is not perturbed by stresses of low intensities. A development of the different forces involved in interparticle contacts is outlined. The description of these forces involved in particle cohesion will help to understand the powder cohesion under consolidation. |
topic |
Consolidation Interparticle forces Nanometric powder van der Waals forces |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000400007 |
work_keys_str_mv |
AT dturki descriptionofconsolidationforcesonnanometricpowders AT nfatah descriptionofconsolidationforcesonnanometricpowders |
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1725880964212588544 |