Some Rheological Measurements on Magnetic Iron Oxide Suspensions in Silicone Oil
作者:
M.‐C. Yang,
L. E. Scriven,
C. W. Macosko,
期刊:
Journal of Rheology
(AIP Available online 1986)
卷期:
Volume 30,
issue 5
页码: 1015-1029
ISSN:0148-6055
年代: 1986
DOI:10.1122/1.549892
出版商: The Society of Rheology
数据来源: AIP
摘要:
A model magnetic suspension was formulated with acicularγ‐Fe2O3particles dispersed in silicone oil. Four volume fractions (2.4, 5.3, 8.7, and 12.9%) were studied in steady shearing over a wide range in rate (10−5to10+3 s−1)using a Rheometric System Four Rheometer. At medium rates instabilities in both cone and plate and parallel plate were observed. At low rates(<10−1 s−1)the stress became independent of rate indicating yield behavior. Yield stresses of 0.25, 4, 5, and 20 Pa were estimated for the four samples. On the 12.9% sample a yield stress of 20 Pa was also found using small amplitude sinusoidal oscillations and with a constant stress rheometer. Below this yield value, solid‐like elastic behavior was observed.
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