Colloid and Polymer Science

, Volume 297, Issue 11–12, pp 1403–1409 | Cite as

Effect of hydrodynamic size on colloidal stability and lifetime of Mn-Zn magnetic fluids

  • Navjot Kaur
  • Bhupendra ChudasamaEmail author
Original Contribution


For transformer cooling applications, magnetic particles need to be dispersed in carrier fluids with high colloidal stability for a long period without significant degradation. However, stability of the suspension, especially the long term colloidal stability is a crucial factor for the applications in power transformers because aggregation of particles could cause clogging of micro-channels in transformers. In this article, we have reported effect of hydrodynamic size on the colloidal stability of Mn1-xZnxFe2O4 (MZ) nanoparticles (NPs)–based magnetic fluids. Lifetime of fluids has been determined from the increase in hydrodynamic size of magnetic NPs due to aggregation. Colloidal stability of fluids decreases with increase in the polydispersity of fluids caused by the enhanced dipole interactions between NPs resulting in the aggregation of NPs in chain-like structures.

Abstract Graphic

Chain formation in magnetic nanoparticles in fluids due to aging


Magnetic fluids Aging Colloidal stability Hydrodynamic particle size 


Vibrating sample magnetometer


Mn1-xZnxFe2O4 (x = 0−1) fluid


Mn1-xZnxFe2O4 (x = 0−1) nanoparticles



Funding Information

N. Kaur is thankful to MANF (UGC-New Delhi) (F1-17.1/2015-16/MANF-2015-17-PUN-53556). The financial support from DST New Delhi (DST FIST scheme no. SR/FST/PSI-176/2012) and Council of Scientific and Industrial Research, New Delhi (scheme No. 03(1226)/12/ERM-II) is gratefully acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

396_2019_4570_MOESM1_ESM.docx (2.9 mb)
ESM 1 (DOCX 2948 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratory of Nanomedicine, School of Physics and Materials ScienceThapar Institute of Engineering & TechnologyPatialaIndia

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