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Title: | Influence of size polydispersity on magnetic field tunable structures in magnetic nanofluids containing superparamagnetic nanoparticles |
Authors: | Mohapatra, D. K. Camp, P. J. Philip, J. |
Issue Date: | 2021 |
Publisher: | Royal Society of Chemistry |
Citation: | Mohapatra D. K. Influence of size polydispersity on magnetic field tunable structures in magnetic nanofluids containing superparamagnetic nanoparticles / D. K. Mohapatra, P. J. Camp, J. Philip. — DOI 10.1039/d1na00131k // Nanoscale Advances. — 2021. — Vol. 3. — Iss. 12. — P. 3573-3592. |
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. © The Royal Society of Chemistry 2021. |
Keywords: | BROWNIAN MOVEMENT LIGHT SCATTERING MAGNETIC FIELDS MAGNETIC FLUIDS NANOFLUIDICS NANOPARTICLES PARTICLE SIZE POLYDISPERSITY SUPERPARAMAGNETISM VOLCANIC ROCKS BROWNIAN DYNAMICS SIMULATIONS IN-PLANE MAGNETIC FIELDS INTERACTING PARTICLES MAGNETIC FIELD STRENGTHS OUT-OF-PLANE MAGNETIC FIELDS POLYDISPERSITY INDICES STRUCTURAL TRANSITIONS SUPERPARAMAGNETIC NANOPARTICLES NANOMAGNETICS |
URI: | http://elar.urfu.ru/handle/10995/102852 |
Access: | info:eu-repo/semantics/openAccess |
RSCI ID: | 46822123 |
SCOPUS ID: | 85107906296 |
WOS ID: | 000648642800001 |
PURE ID: | 22104245 9df0704a-cd5d-4df6-be11-2bae1bf9538c |
ISSN: | 25160230 |
DOI: | 10.1039/d1na00131k |
Appears in Collections: | Научные публикации, проиндексированные в SCOPUS и WoS CC |
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2-s2.0-85107906296.pdf | 2,82 MB | Adobe PDF | View/Open |
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