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5175614 
Journal Article 
Hysteresis behaviors of poly (naphthalene quinone) radical electrorheological fluid 
Choi, HJ; Cho, MS; Jhon, MS 
1999 
Yes 
International Journal of Modern Physics B
ISSN: 0217-9792 
WORLD SCIENTIFIC PUBL CO PTE LTD 
SINGAPORE 
13 
14-16 
1901-1907 
English 
WOS:000082422800030 
As a potential electrorheological(ER) material, poly(naphthalene quinone) radical (PNQR) ER fluid was prepared, and its rheological behavior and hysteresis phenomenon were investigated. PNQR was synthesized by Friedel-Crafts acylation between naphthalene and phthalic anhydride, using zinc chloride as a catalyst at 256 degrees C. A Physica rheometer equipped with a high voltage generator was used to measure the rheological properties of the ER fluids, which were prepared by dispersing PNQR in silicone oil at several particle concentrations. Shear stresses were observed to decrease as shear rate increased in the region of slow deformation rate. It was further found that ER fluid showed different hysteresis behaviors according to the shear rate ranges; thixotropy was observed in the low shear rate region (0.007 - 0.5 1/s) and anti-thixotropy in the high shear rate region (0.5 - 1000 1/s). Controlled shear stress mode was also applied to observe similar behaviors. 
Physics; Materials Science 
6th International Conference on Electro-Rheological Fluids, Magneto-Rheological Suspensions and Their Applications (E RMR 97) 
YONEZAWA, JAPAN