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Electrorotation is an effective technique to characterize the electrical properties of dispersed particles. For the low Reynolds number microsystem, the mechanism of the electrorotation of microparticles induced by torque was analyzed based on the Maxwell-Wagner polarization. Characteristic frequency corresponding to the peak value of the electrorotation speed was deduced and the effect of the relaxation time on the particles' electrorotation direction was analyzed by the simulation of the electrorotation speed induced by the torque. The mechanism of the electrorotation of the microparticles induced by electroosmotic slip was qualitative analyzed based on the double layer and the idea about the gold surface being favorable to the electrorotation was proposed. Experiments on the electrorotation of the polystyrene with the carboxy surface and gold modified surface were performed, respectively. The results show that, the direction of the electrorotation of polystyrene spheres with carboxy surface is opposite to the electric field and, the corresponding frequency is higher with the torque playing the leading role. On the other hand, direction of the rotation of polystyrene spheres with the gold surface is homodromous with the electric field and the corresponding frequency is lower with the electroosmotic slip playing the leading rose.
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Keywords:
- microsystem /
- electrorotation /
- torque /
- electroosmotic slip
[1] Morgan H, Green N G 2002 AC Electrokinetics: colloids and nanoparticles (Baldock: Research Studies Press Ltd.) p67
[2] Stone H, Stroock A, Ajdari A 2004 Annu. Rev. Fluid Mech. 36 381
[3] Ren Y K, Yan H, Jiang H Y, Gu J Z, Ramos A 2009 Chin. Phys. B 18 4349
[4] Hardt S, Schnfeld F 2007 Microfluidic Technologies for Miniaturized Analysis Systems (New York: Springer-Verlag.)
[5] Ramos A, Morgan H, Green N G, Castellanos A 1998 J. Phys. D: Appl. Phys. 31 2338
[6] Jiang H Y, Ren Y K, Ao H R 2008 Chin. Phys. B 17 4541
[7] Li B X, Ye M Y, Chu Q Y, Yu J 2007 Acta Phys. Sin. 56 3447 (in Chinese) [李宝兴、 叶美英、 褚巧燕、 俞 健 2007 56 3447]
[8] Liu H W, Ma D M, Shi W, Tian L Q, Wang X M, Xie W P, Xu M, Zhou L J 2009 Acta Phys. Sin. 58 1219 (in Chinese)[刘宏伟、 马德明、 施 卫、 田立强、 王馨梅、 谢卫平、 徐 鸣、 周良骥 2009 58 1219]
[9] Hou L, Liu Z, Shi W, Wang X M, Xu M 2008 Acta Phys. Sin. 57 7185 (in Chinese) [侯 磊、 刘 峥、 施 卫、 王馨梅、 徐 鸣 2008 57 7185]
[10] Ren Y K, Jiang H Y, Yang H K, Ramos A, Garcia-Sanchez P 2009 J. Electrostatics 67 372
[11] Li F M, Liu X, Lu X Z, Qian S X, Wang G M, Wang W J, Xu J H 2000 Acta Phys. Sin. 49 544 (in Chinese)[李富铭、 刘 秀、 陆兴泽、 钱士雄、 王恭明、 王文军、 徐建华 2000 49 544]
[12] Deng L Z, Xia Y, Yin J P 2007 Chin. Phys. 16 707
[13] Ren Y K, Ao H R, Gu J Z, Jiang H Y, Ramos A 2009 Acta Phys. Sin. 58 7869 (in Chinese) [任玉坤、 敖宏瑞、 顾建忠、 姜洪源、Ramos A 2009 58 7869]
[14] Amold W M, Zimmermann U 1988 J. Electrostatics 21 151
[15] Amold W M, Schwan H P, Zimmermann U 1987 J. Phys. Chem. 91 5093
[16] Burt J P H, Chan K L, Dawson D, Patron A, Pething R 1996 Ann. Biol. Clin. 54 253
[17] Huang G P, Yu K W, Gu G Q 2002 Phys. Rev. E 65 021401
[18] Dolinsky Yu, Elperin T 2009 Phys. Rev. E 80 066607
[19] Kakutani T, Shibatani S, Sugai M 1993 Bioelectrochem Bioenerg 92 67
[20] Falokun C D, Markx G H 2007 J. Electrostatics 65 475
[21] Yang C Y, Lei U 2007 J. Appl. Phys. 102 094702
[22] Gross C, Shilov V N 1996 J. Phys. Chem. 100 1771
[23] Gross C, Shilov V N 1998 Colliods Surfaces A: Physicochem. Eng. Aspects 140 199
[24] Green N G, Ramos A, Gonzalez A, Morgan H, Castellanos A 2000 Phys. Rev. E 61 4011
[25] Pohl H A 1978 Dielectrophoresis (Cambridge: Cambridge University Press)
[26] Minoura I, Muto E 2006 Biophys. J. 90 3739
[27] Georgieva R, Neu B, Shilov V M, Knippel E, Budde A, Latza R, Donath E, Kiesewetter H, Baumler H 1998 Biophys. J. 74 2114
[28] Vykoukal J, Vykoukal D M, Sharma S, Becker F F, Gascoyne P R C 2003 Langmuir 19 2425
[29] Lim J, Eggeman A, Lanni F, Tilton R D, Majetich S 2008 Adv. Mater. 20 1721
[30] Lian M, Islam N, Wu J 2007 IET Nanobiotecnol. 1(3) 36
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[1] Morgan H, Green N G 2002 AC Electrokinetics: colloids and nanoparticles (Baldock: Research Studies Press Ltd.) p67
[2] Stone H, Stroock A, Ajdari A 2004 Annu. Rev. Fluid Mech. 36 381
[3] Ren Y K, Yan H, Jiang H Y, Gu J Z, Ramos A 2009 Chin. Phys. B 18 4349
[4] Hardt S, Schnfeld F 2007 Microfluidic Technologies for Miniaturized Analysis Systems (New York: Springer-Verlag.)
[5] Ramos A, Morgan H, Green N G, Castellanos A 1998 J. Phys. D: Appl. Phys. 31 2338
[6] Jiang H Y, Ren Y K, Ao H R 2008 Chin. Phys. B 17 4541
[7] Li B X, Ye M Y, Chu Q Y, Yu J 2007 Acta Phys. Sin. 56 3447 (in Chinese) [李宝兴、 叶美英、 褚巧燕、 俞 健 2007 56 3447]
[8] Liu H W, Ma D M, Shi W, Tian L Q, Wang X M, Xie W P, Xu M, Zhou L J 2009 Acta Phys. Sin. 58 1219 (in Chinese)[刘宏伟、 马德明、 施 卫、 田立强、 王馨梅、 谢卫平、 徐 鸣、 周良骥 2009 58 1219]
[9] Hou L, Liu Z, Shi W, Wang X M, Xu M 2008 Acta Phys. Sin. 57 7185 (in Chinese) [侯 磊、 刘 峥、 施 卫、 王馨梅、 徐 鸣 2008 57 7185]
[10] Ren Y K, Jiang H Y, Yang H K, Ramos A, Garcia-Sanchez P 2009 J. Electrostatics 67 372
[11] Li F M, Liu X, Lu X Z, Qian S X, Wang G M, Wang W J, Xu J H 2000 Acta Phys. Sin. 49 544 (in Chinese)[李富铭、 刘 秀、 陆兴泽、 钱士雄、 王恭明、 王文军、 徐建华 2000 49 544]
[12] Deng L Z, Xia Y, Yin J P 2007 Chin. Phys. 16 707
[13] Ren Y K, Ao H R, Gu J Z, Jiang H Y, Ramos A 2009 Acta Phys. Sin. 58 7869 (in Chinese) [任玉坤、 敖宏瑞、 顾建忠、 姜洪源、Ramos A 2009 58 7869]
[14] Amold W M, Zimmermann U 1988 J. Electrostatics 21 151
[15] Amold W M, Schwan H P, Zimmermann U 1987 J. Phys. Chem. 91 5093
[16] Burt J P H, Chan K L, Dawson D, Patron A, Pething R 1996 Ann. Biol. Clin. 54 253
[17] Huang G P, Yu K W, Gu G Q 2002 Phys. Rev. E 65 021401
[18] Dolinsky Yu, Elperin T 2009 Phys. Rev. E 80 066607
[19] Kakutani T, Shibatani S, Sugai M 1993 Bioelectrochem Bioenerg 92 67
[20] Falokun C D, Markx G H 2007 J. Electrostatics 65 475
[21] Yang C Y, Lei U 2007 J. Appl. Phys. 102 094702
[22] Gross C, Shilov V N 1996 J. Phys. Chem. 100 1771
[23] Gross C, Shilov V N 1998 Colliods Surfaces A: Physicochem. Eng. Aspects 140 199
[24] Green N G, Ramos A, Gonzalez A, Morgan H, Castellanos A 2000 Phys. Rev. E 61 4011
[25] Pohl H A 1978 Dielectrophoresis (Cambridge: Cambridge University Press)
[26] Minoura I, Muto E 2006 Biophys. J. 90 3739
[27] Georgieva R, Neu B, Shilov V M, Knippel E, Budde A, Latza R, Donath E, Kiesewetter H, Baumler H 1998 Biophys. J. 74 2114
[28] Vykoukal J, Vykoukal D M, Sharma S, Becker F F, Gascoyne P R C 2003 Langmuir 19 2425
[29] Lim J, Eggeman A, Lanni F, Tilton R D, Majetich S 2008 Adv. Mater. 20 1721
[30] Lian M, Islam N, Wu J 2007 IET Nanobiotecnol. 1(3) 36
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