Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
권호 표지
DOI QR코드

DOI QR Code

Fractal Nature of Magnetic Colloidal Dispersion with Cobalt Iron Oxide and Metal Iron Particles

  • Yoon, Kwan Han (Department of Chemical Engineering, Kumoh National Institute of Technology) ;
  • Lee, Young Sil (Industry-Academic Cooperation Foundation, Kumoh National Institute of Technology)
  • Received : 2021.06.10
  • Accepted : 2021.08.30
  • Published : 2022.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

The microstructure of highly aggregated colloidal dispersions was investigated by probing the rheological behavior of magnetic suspensions. The dynamic moduli as functions of frequency and strain amplitude are shown to closely resemble that of colloidal gels indicating the formation of network structure. The two types of characteristic critical strain amplitudes, γc and γy, were characterized in terms of the changing microstructure. The amplitude of γc indicates the transition from linear to nonlinear viscoelasticity and depends only on particle volume fraction not magnetic interactions. The study of scaling behavior suggests that it is related to the breakage of interfloc, i.e., floc-floc structure. However, yielding strain, γy, was found to be independent of particle volume fraction as well as magnetic interaction. It relates to extensive deformation resulting in yielding behavior. The scaling of elastic constant, Ge, implies that this yielding behavior and hence γy is due to the breakage of long-range interfloc interactions. Also, the deformation of flocs due to increase strain was indicated from the investigation of the fractal nature.

Keywords

Acknowledgement

This research was supported by Research Fund from Kumoh National Institute of Technology (2019-104-093).

References

  1. Gravelle, A. J. and Marangoni, A. G., "A New Fractal Structural-Mechanical Theory of Particle-Filled Colloidal Networks with Heterogeneous Stress Translation," J. Colloid Interface Sci., 598, 56-68(2021). https://doi.org/10.1016/j.jcis.2021.03.180
  2. Buscall, R., Mills, P. D. A., Goodwin, J. W. and Lawson, D. W., "Scaling Behaviour of the Rheology of Aggregate Networks Formed From Colloidal Particles," J. Chem. Soc., Faraday Trans. 1, 84, 4249-4260(1988). https://doi.org/10.1039/f19888404249
  3. Khan S. A. and Zoeller, N. J., "Dynamic Rheological Behavior of Flocculated Fumed Silica Suspensions," J. Rheol., 37, 1225-1236(1993). https://doi.org/10.1122/1.550378
  4. Coussot, P., "Rheophysics of Pastes: A Review of Microscopic Modelling Approaches," Soft Matter, 3, 528-540(2007). https://doi.org/10.1039/b611021p
  5. O'Grady, K., Gilson, R. G. and Hobby, P. C., "Magnetic Pigment Dispersions (A Tutorial Review)," J. Magn. Magn. Mater., 95, 341-355(1991). https://doi.org/10.1016/0304-8853(91)90229-4
  6. Kanai, H., Navrarrete, R. C., Macosko, C. W. and Scriven, L. E., "Fragile Networks and Rheology of Concentrated Suspensions," Rheol. Acta, 31, 333-344(1992). https://doi.org/10.1007/BF00418330
  7. Navrarrete, R. C., Scriven L.E. and Macosko, C.W., "Rheology and Structure of Flocculated Iron Oxide Suspensions," J. Colloid Interface Sci., 180, 200(1996). https://doi.org/10.1006/jcis.1996.0290
  8. Potanin, A. A., R.J. Hiroki, Peikov. V. T. and Lane, A. M., "Probing Magnetic Paints Through Magnetorheological and Susceptibility Measurements," J. Rheol., 42, 1249(1998). https://doi.org/10.1122/1.550928
  9. Trappe, V. and Weitz, D. A., "Scaling of the Viscoelasticity of Weakly Attractive Particles," Phys. Rev. Lett., 85, 449-452(2000). https://doi.org/10.1103/PhysRevLett.85.449
  10. Philipse, A. P. and Wierenga, A. M., "On the Density and Structure Formation in Gels and Clusters of Colloidal Rods and Fibers," Langmuir, 14, 49-54(1998). https://doi.org/10.1021/la9703757
  11. Shih, W.-H., Shih, W. Y., Kim, S. I., Liu J. and Aksay, I. A., "Scaling Behavior of The Elastic Properties of Colloidal Gels," Phys. Rev. A, 42, 4772-4779(1990). https://doi.org/10.1103/PhysRevA.42.4772
  12. Ikeda, S., Foegeding A. and Hagiwara, T., "Rheological Study on the Fractal Nature of the Protein Gel Structure," Langmuir, 15, 8584-8589(1999). https://doi.org/10.1021/la9817415
  13. Chae, B. S., Lee, Y. S. and Jhon, M. S., "The Scaling Behavior of a Highly Aggregated Colloidal Suspension Microstructure and Its Change in Shear Flow," Colloid. Polym. Sci., 282, 236- 242(2004). https://doi.org/10.1007/s00396-003-0924-z
  14. Kim, H. S. and Mason, T. G., "Advances and Challenges in the Rheology of Concentrated Emulsions and Nanoemulsions," Adv. Colloid Interface Sci., 247, 397-412(2017). https://doi.org/10.1016/j.cis.2017.07.002
  15. Lee, Y. S., Chae, B. S., Lane, A. M. and Wiest, J. M., "Rheological Behavior and Microstructure of Magnetic Dispersions with Varying Nonmagnetic Particle Content," Colloids Surf. A Physicochem. Eng. Asp., 224, 23-31(2003). https://doi.org/10.1016/S0927-7757(03)00265-6
  16. Pan, X.-D. and Mckinley, G. H., "Structural Limitation to the Material Strength of Electrorheological Fluids," Appl. Phys. Lett., 71, 333-335(1997). https://doi.org/10.1063/1.119530
  17. Casson, N., Rheology of Disperse Systems, Pergamon, London (1959).
  18. Shih, W. Y., Shih, W-H. and Aksay, I. A., "Elastic and Yield Behavior of Strongly Flocculated Colloids," J. Am. Ceram. Soc., 82, 616-624(1999). https://doi.org/10.1111/j.1151-2916.1999.tb01809.x
  19. Chen, M. and Russel, W. B., "Characteristics of Flocculated Silica Dispersions," J. Colloid Interface Sci., 141, 564-577(1991). https://doi.org/10.1016/0021-9797(91)90353-A
  20. de Gennes, P. G., Scaling Concepts of Polymer Physics, Cornell University Press, Ithaca, New York (1979).
  21. Sollich, P., Lequeux, F., Hebraud, P. and Cates, M. E., "Rheology of Soft Glassy Materials," Phys. Rev. Lett., 78, 2020-2023(1997). https://doi.org/10.1103/PhysRevLett.78.2020
  22. Mason, T. G. and Weitz, D. A., "Optical Measurements of Frequency-Dependent Linear Viscoelastic Moduli of Complex Fluids," Phys. Rev. Lett., 74, 1250-1253(1995). https://doi.org/10.1103/PhysRevLett.74.1250