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Influence of size polydispersity on magnetic field tunable structures in magnetic nanofluids containing superparamagnetic nanoparticles. | LitMetric

Influence of size polydispersity on magnetic field tunable structures in magnetic nanofluids containing superparamagnetic nanoparticles.

Nanoscale Adv

Smart Materials Section, Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI Kalpakkam-603102 India

Published: June 2021

AI Article Synopsis

  • This study examines how the size diversity of particles (polydispersity) in magnetic fluids (ferrofluids) influences the structures formed under different magnetic fields using various microscopy techniques and simulations.
  • Three ferrofluids with varying polydispersity indices demonstrate that high PDI fluids can form multiple complex structures (like chains and sheets) under magnetic fields, while low PDI fluids don't show such aggregation.
  • The research identifies key structural transitions in high-PDI samples and constructs a phase diagram, suggesting potential applications in optical devices by adjusting particle size diversity.

Article Abstract

We probe the influence of particle size polydispersity on field-induced structures and structural transitions in magnetic fluids (ferrofluids) using phase contrast optical microscopy, light scattering and Brownian dynamics simulations. Three different ferrofluids containing superparamagnetic nanoparticles of different polydispersity indices (PDIs) are used. In a ferrofluid with a high PDI (∼0.79), thin chains, thick chains, and sheets are formed on increasing the in-plane magnetic field, whereas isotropic bubbles, and hexagonal and lamellar/stripe structures are formed on increasing the out-of-plane magnetic field over the same range. In contrast, no field-induced aggregates are seen in the sample with low polydispersity under the above conditions. In a polydisperse sample, bubbles are formed at a very low magnetic field strength of 30 G. Insights into the structural evolution with increasing magnetic field strength are obtained by carrying out Brownian dynamics simulations. The crossovers from isotropic, through hexagonal columnar, to lamellar/stripe structures observed with increasing field strength in the high-polydispersity sample indicate the prominent roles of large, more strongly interacting particles in structural transitions in ferrofluids. Based on the observed microstructures, a phase diagram is constructed. Our work opens up new opportunities to develop optical devices and access diverse structures by tuning size polydispersity.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9419785PMC
http://dx.doi.org/10.1039/d1na00131kDOI Listing

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