A HIGHLY ACTIVE ELECTRORHEOLOGICAL MATERIAL, NANO-SIZED BOEHMITE: INFLUENCE OF HYDROXYL ON ITS ELECTRORHEOLOGICAL PROPERTY

A highly active electrorheological (ER) material, nano-sized boehmite, AlO(OH), has been obtained. The relative shear stress (τ r  = τ E /τ 0 , τ 0 and τ E are the shear stresses at the electric field strength of 0 kV/mm and 4.2 kV/mm, respectively) of the suspension (25 wt.%) in silicone oil reache...

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Bibliographic Details
Published in:Chemical engineering communications 2010-05, Vol.197 (5), p.684-691
Main Authors: Huo, Li, Liao, Fu-Hui, Li, Jun-Ran, Zhang, Shao-Hua, Zhang, Olivia, Xu, Ming-Yuan
Format: Article
Language:English
Subjects:
Boehmite
Conductivity
Dielectric properties
Electric fields
Electrical properties
Electrorheological activity
Nanomaterials
Shear stress
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Summary:A highly active electrorheological (ER) material, nano-sized boehmite, AlO(OH), has been obtained. The relative shear stress (τ r  = τ E /τ 0 , τ 0 and τ E are the shear stresses at the electric field strength of 0 kV/mm and 4.2 kV/mm, respectively) of the suspension (25 wt.%) in silicone oil reached 212 at a shear rate of 14.5 s −1 and a DC electric field. The dielectric property, conductivity, surface energy, microstructure, and composition of boehmite [AlO(OH)] and alkaline alumina containing both AlO(OH) and Al 2 O 3 have been studied. The results showed that the hydroxyl group plays a critical role in influencing the ER activity of the material by changing the dielectric property and conductivity of the material.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986440903287809