Electrorheological properties of suspensions of inorganic shell/organic core composite particles

Journal Article · Mon Oct 31 23:00:00 EST 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1413· OSTI ID:6892641

Otsubo, Yasufumi ^[1]; Edamura, Kazuya ^[2]

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1. Chiba Univ. (Japan). Dept. of Image Science
2. Fujikura Kasei Co., Tokyo (Japan)

Composite particles consisting of a polymer core and inorganic shell are formed by suspension polymerization. The electrorheological (ER) behavior of the suspensions is studied in relation to surface conditions. When the composite particles are subjected to jet-stream agitation, the ER effects are strikingly enhanced. Although the inorganic shell on the polymer particles is responsible for the ER effect, the impurities which were derived from the polymerization reaction must be removed from the surfaces. The suspensions are nonconducting, even through the polymer cores are coated with conducting particles. In composite particles, the thin layer of polymer prevents direct contact of inorganic particles which are arranged in layers on the polymer core. Since the density of composite particles is comparable to that of oil, the suspensions have long-term stability against sedimentation.

• OSTI ID: 6892641
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 168:1; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
COMPOSITE MATERIALS
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
MATERIALS
PARTICLES
PARTICULATES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POLYMERS
RHEOLOGY
SURFACE PROPERTIES
USES