Electrorheology of cellulose phosphate ester suspension as a new anhydrous ER fluid

Choi, Ung-su; Ahn, Byeng-Gil

doi:10.1016/s0927-7757(99)00507-5

Cited by 13 publications

(4 citation statements)

References 14 publications

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“…Before shearing the ER fluid, the dispersed particles are aligned through the electric field direction making columnar structures, and these structures become stronger at higher electric fields. Similar results were reported for the studies of poly(lithium‐2‐acrylamido‐2‐methyl propane sulfonic acid),11 sepiolite,40 poly(naphthalene quinone) radical,41 cellulose,42 PANI,43 and mesoporous molecular sieve,44 in which SO was used as continuous phase for the suspensions.…”

Section: Resultssupporting

confidence: 78%

Synthesis, characterization and electrorheological properties of poly(o‐toluidine)/Zn conducting composites

Yılmaz

Ünal

Sarı

2006

J of Applied Polymer Sci

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In this study, the synthesis, characterization, and electrorheological (ER) properties of poly(o-toluidine)/ Zn, (POT/Zn), composites were investigated. Syntheses of the composites were carried out by a chemical method using ammonium persulfate, (NH 4 ) 2 S 2 O 8 , (APS), as a free radical initiator. The composites were characterized by Fourier transform infrared (FTIR) spectroscopy, electrical conductivity, magnetic susceptibility, particle size measurements, and scanning electron microscopy (SEM). A series of Zn-containing composites were prepared (0.8-7.6% by mass), and their conductivities were measured to be within the range of 1.7 Â 10. Magnetic properties of POT/Zn composites were analyzed by Gouy scale measurements; it was found that their conducting mechanisms are bipolaron. A series of particle size (13, 17, 18, 26, 83 mm) were prepared by ground milling the crude POT/ Zn composites. Colloidal suspensions of POT/Zn composites were prepared in silicone oil (SO), at a series of concentrations (10-30%, m/m), and sedimentation stabilities were measured at 258C. ER measurements showed that the POT/Zn/SO suspension system was ER active. Thus, the effects of solid particle concentration, shear rate, electric field strength, addition of polar promoters, and temperature (25-1258C) onto ER activities of suspensions were investigated. The ER activity of suspensions was increased with increasing particle concentration and electric field strength and decreasing shear rate and showing a nonNewtonian flow behavior. t ¼ 1.1 kPa shear stress was reached for POT/Zn (4.1 wt %, Zn) composite under E ¼ 2.0 kV, c ¼ 15 (%, m/m), _ g ¼ 1:0 s À1 , and T ¼ 258C conditions. It was found that the ER activity was slightly decreased with increasing temperature. Further, the addition of polar promoters had no promoting effect on the ER activity of the suspensions and POT/Zn/ SO system was classified as dry ER materials.

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Section: Resultssupporting

confidence: 78%

Synthesis, characterization and electrorheological properties of poly(o‐toluidine)/Zn conducting composites

Yılmaz

Ünal

Sarı

2006

J of Applied Polymer Sci

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“…Before shearing the ER fluid, the dispersed particles are aligned through the electric field direction, making columnar structures, and these structures become stronger at higher electric fields. Similar results were reported for the studies of poly(lithium-2-acrylamido-2-methyl propane sulfonic acid), 11 sepiolite, 21 poly (naphthalene quinone radical, 24 cellulose, 25 PANI, 26 calcium carbonate, 22 and mesoporous molecular sieve, 27 in which silicone oil was used as continuous phase for the suspensions.…”

Section: Figuresupporting

confidence: 74%

Investigation of electrorheological properties of kaolin suspensions under DC fields

Yılmaz

Yilmaz

2006

J of Applied Polymer Sci

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In this study, the electrorheological (ER) behavior of suspensions prepared from d 50 ¼ 7 mm kaolin particulate, dispersed in insulating silicone oil (SO) medium, was investigated. ER activity of all the suspensions was observed to increase with increasing electric field strength (E), concentration (c), and decreasing shear rate (_ g). Shear stress (_ g) of kaolin suspensions increased linearly with increasing concentrations of the particles and with the applied electric field strength. The viscosity (Z) of all suspensions was decreased sharply with increasing shear rate and showing a typical shear thinning non-Newtonian viscoelastic behavior. It was observed that kaolin/silicone oil system studied in the present work was sensitive to high temperature.

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“…A case in point is their modification with phosphate groups. [23][24][25][26] After the modification of starch or cellulose, the yield stress of their fluids increased 3-5 fold. Hybrid materials of cellulose and starch have been tried to increase the yield stress such as starch/silicon oil/silicone rubber hybrid, 27 polysaccharide/titanium oxide hybrid, 28 Fig.…”

Section: Er Materials Based On Cellulose and Starchmentioning

confidence: 99%

Gelation of natural polymer dispersed suspensions under electric field

Choi

2012

Soft Matter

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Electrorheology of cellulose phosphate ester suspension as a new anhydrous ER fluid

Cited by 13 publications

References 14 publications

Synthesis, characterization and electrorheological properties of poly(o‐toluidine)/Zn conducting composites

Synthesis, characterization and electrorheological properties of poly(o‐toluidine)/Zn conducting composites

Investigation of electrorheological properties of kaolin suspensions under DC fields

Gelation of natural polymer dispersed suspensions under electric field

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