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...

Full description

Bibliographic Details
Main Authors: D. Turki, N. Fatah
Format: Article
Language:English
Published: Brazilian Society of Chemical Engineering 2010-12-01
Series:Brazilian Journal of Chemical Engineering
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322010000400007
id doaj-d4f7881c57234c56b4984805c0bd85ce
record_format Article
spelling 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
_version_ 1725880964212588544