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The SiO 2 adsorbing YF 3, Y 2(CO 3) 3, Y 2(C 2O 4) 3 and YPO 4, respectively, formed four systems of particle materials: SiO 2·YF 3, SiO 2·Y 2(CO 3) 3 , SiO 2·Y 2(C 2O 4) 3 and SiO 2·YPO 4. The electrorheological(ER) behavior of the electrorheological fluids (ERF) prepared by dispersing them in silicone oil was tested at 20 ℃ under d.c. field. The results show that the system of SiO 2·YF 3 does not display ER activity, and the ER performance of the particle materials of SiO 2·Y 2(CO 3) 3 is the best among them. The shearing stress of ERF with SiO 2·Y 2(CO 3) 3 particles is 1.644 KPa and the relative viscosity η r(=η E/η 0) is 20.3 (under field strength E=4200 V·mm -1) while the adsorbed content of Y 2(CO 3) 3 in the SiO 2 particle materials is 12.4%(mass fraction).
The SiO 2 adsorbing YF 3, Y 2 (CO 3) 3, Y 2 (C 2 O 4) 3 and YPO 4, respectively, formed four systems of particle materials: SiO 2 .YF 3, SiO 2 .Y 2 (CO 3 ) 3, SiO 2 · Y 2 (C 2 O 4) 3 and SiO 2 · YPO 4. The electrorheological (ER) behavior of the electrorheological fluids (ERF) prepared by dispersing them in silicone oil was tested at 20 ° C. under dc field. The results show that the system of SiO 2 · YF 3 does not display ER activity, and the ER performance of the particle materials of SiO 2 · Y 2 (CO 3) 3 is the best among them. The shearing stress of ERF with SiO 2 · Y 2 (CO 3) 3 particles are 1.644 KPa and the relative viscosity η r (= η E / η 0) is 20.3 (under field strength E = 4200 V · mm -1) while the adsorbed content of Y 2 ( CO 3) 3 in the SiO 2 particle materials is 12.4% (mass fraction).