Colloid and Polymer Science

, Volume 288, Issue 3, pp 359–363 | Cite as

Two-layer coating with polymer and carbon nanotube on magnetic carbonyl iron particle and its magnetorheology

Short Communication


Magnetic carbonyl iron (CI)-based magnetorheological (MR) fluids generally posses serious dispersion defects due to the large density mismatch between the CI particles and continuous oil medium, which restricts further MR applications. Polymer coating technology has been introduced in an attempt to reduce the density or prevent CI particle aggregation. In this study, a unique functional coating composed of a polyaniline layer and multiwalled carbon nanotube nest was fabricated on the surface of CI particles using a dispersion polymerization and solvent casting method to improve the sedimentation problem of CI-based MR fluids when dispersed in medium oil. The coating morphology was analyzed by scanning electron microscopy. The effect of the functional coating on the MR performance along with the sedimentation observations was investigated using a rotational rheometer. The results showed that the sedimentation of dispersed particles was improved considerably by the reduced density and rough morphology.


Magnetic particle Magnetorheological fluid Polyaniline Multiwalled carbon nanotube 



The authors wish to acknowledge to Mr. Hwang Sun Jae for his valuable assistance with the transmission electron microscopy (TEM) investigations. This work was supported by ETRI (2009).


  1. 1.
    Bica I (2009) Mater Lett 63:2230CrossRefGoogle Scholar
  2. 2.
    Kim JH, Fang FF, Choi HJ, Seo Y (2008) Mater Lett 62:2897CrossRefGoogle Scholar
  3. 3.
    Li WH, Lynam C, Chen J, Liu B, Zhang XZ, Wallace GG (2007) Mater Lett 60:3116CrossRefGoogle Scholar
  4. 4.
    Ekwebelam CC, See H (2007) Korea-Australia Rheol J 19:35Google Scholar
  5. 5.
    Pu HT, Jiang FJ, Yang ZL (2006) Mater Lett 60:94CrossRefGoogle Scholar
  6. 6.
    Li WH, Zhang XZ (2008) Korea-Australia Rheol J 20:45Google Scholar
  7. 7.
    Choi HJ, Jhon MS (2009) Soft Matter 5:1562CrossRefGoogle Scholar
  8. 8.
    Yin J, Zhao X, Xia X, Xiang L, Qiao Y (2008) Polymer 49:4413CrossRefGoogle Scholar
  9. 9.
    Fang FF, Kim JH, Choi HJ, Kim CA (2009) Colloid Polym Sci 287:745CrossRefGoogle Scholar
  10. 10.
    Cheng YC, Guo JJ, Xu GJ, Cui P, Liu XH, Liu FH, Wu JH (2008) Colloid Polym Sci 286:1493CrossRefGoogle Scholar
  11. 11.
    Hong CH, Sung JH, Choi HJ (2009) Colloid Polym Sci 287:583CrossRefGoogle Scholar
  12. 12.
    Bica I, Choi HJ (2008) Int J Mod Phys B 22:5041CrossRefGoogle Scholar
  13. 13.
    See H, Joung C, Ekwebelam C (2007) Int J Mod Phys B 21:4945CrossRefGoogle Scholar
  14. 14.
    Jang IB, Kim HB, Lee JY, You JL, Choi HJ, Jhon MS (2005) J Appl Phys 97:10Q912CrossRefGoogle Scholar
  15. 15.
    de Vicente J, López-López MT, Durán JDG, González-Caballero F (2004) Rheol Acta 44:94CrossRefGoogle Scholar
  16. 16.
    Lim ST, Cho MS, Jang IB, Choi HJ, Jhon MS (2004) IEEE Trans Magn 40:3033CrossRefGoogle Scholar
  17. 17.
    Lim ST, Choi HJ, Jhon MS (2005) IEEE Trans Magn 41:3745CrossRefGoogle Scholar
  18. 18.
    Fang FF, Jang IB, Choi HJ (2007) Diamond Relat Mater 16:1167CrossRefGoogle Scholar
  19. 19.
    Cho MS, Lim ST, Jang IB, Choi HJ, Jhon MS (2004) IEEE Trans Magn 40:3036CrossRefGoogle Scholar
  20. 20.
    Wu WP, Zhao BY, Wu Q, Chen LS, Hu KA (2006) Smart Mater Struct 15:N94CrossRefGoogle Scholar
  21. 21.
    Fang FF, Choi HJ (2008) J Appl Phys 103:07A301CrossRefGoogle Scholar
  22. 22.
    Larson RG (1999) The structure and rheology of complex fluids, Chap. 7. Oxford University Press, New YorkGoogle Scholar
  23. 23.
    Wollny K, Läuger J, Huck S (2002) Appl Rheol 12:25Google Scholar
  24. 24.
    Gu R, Gong X, Jiang W, Hao L, Xuan S, Zhang Z (2008) J Magn Magn Mater 320:2788CrossRefGoogle Scholar
  25. 25.
    Ginder JM, Davis LC, Elie LD (1996) Int J Mod Phys B 10:3293CrossRefGoogle Scholar
  26. 26.
    Choi HJ, Cho MS, Kim JW, Kim CA, Jhon MS (2001) Appl Phys Lett 78:3806CrossRefGoogle Scholar
  27. 27.
    Fang FF, Choi HJ, Jhon MS (2009) Colloids Surf A: Physicochemical Eng Asp 351:46CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of Polymer Science and EngineeringInha UniversityIncheonSouth Korea
  2. 2.School of Display EngineeringHoseo UniversityChungnamSouth Korea

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