Influence of particle shape on the viscosity of kaolin suspensions

Title:

Influence of particle shape on the viscosity of kaolin suspensions

Creator:

Eva Gregorová, Willi Pabst, and Bouchet, Jean-Baptiste

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:8a13b37a-9c82-4bf2-a953-c9035982d1f0
uuid:8a13b37a-9c82-4bf2-a953-c9035982d1f0
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, kaolin, viskozita, viscosity, particle shape, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

The influence of particle shape (aspect ratio) on the intrinsic viscosity is investigated, taking three Czech kaolin products (floated kaolins) as paradigmatic examples. An average aspect ratio is obtained for each kaolin from a comparison of particle size measurements using sedimentation and laser diffraction. The intrinsic viscosity is obtained by a multistep procedure: firstly, flow curves are recorded for each kaolin with the optimum deflocculant concentration, secondly, the (apparent) relative viscosities read off from the flow curves are plotted against the kaolin volume fraction and, thirdly, these data are fitted using the Krieger relation to obtain the intrinsic viscosity in the asymptotic dilute limit. It is shown that the data determined with the method proposed are within the Jeffery and Brenner bounds and that an average aspect ratio of about 20 (17-22) results in an intrinsic viscosity of about 10 (7-13), compared to 2.5 for spherical particles. Although currently th e measurement precision is not suffi cient to seriously assess the influence of Brownian motion, the method can principally be used to predict the intrinsic viscosity when the average aspect ratio of the system (and its particle size distribution) is known, and vice versa., Eva Gregorová, Willi Pabst and Jean-Baptiste Bouchet., and Obsahuje bibliografické odkazy

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2009 Volume:6 | Number:1 (153)

Harvested from:

CDK

Metadata only:

false