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Issue 27, 2019
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Evolution of nematic and ferromagnetic ordering in suspensions of magnetic nanoplatelets

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Abstract

Suspensions of magnetic nanoplatelets in isotropic solvents are very interesting examples of ferrofluids. It has been shown that above a certain concentration ΦNI such suspensions form a ferromagnetic nematic phase, which makes this system a unique example of a dipolar fluid. The formation of a nematic phase is driven by anisotropic electrostatic and long-range dipolar magnetic interactions. Here, we present studies of the evolution of short range positional and orientational magnetic order in suspensions with volume fractions below and above ΦNI, using small angle neutron scattering (SANS). The results show that in the absence of an external magnetic field, short range positional and orientational order already exist at relatively low volume fractions. Polarized SANS revealed that the contribution of ferromagnetic ordering to the formation of the nematic phase is significant. The ferromagnetic correlations can be qualitatively explained by a simple model, which takes into account anisotropic screened electrostatic and dipolar magnetic interactions.

Graphical abstract: Evolution of nematic and ferromagnetic ordering in suspensions of magnetic nanoplatelets

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Publication details

The article was received on 09 May 2019, accepted on 17 Jun 2019 and first published on 18 Jun 2019


Article type: Paper
DOI: 10.1039/C9SM00949C
Soft Matter, 2019,15, 5412-5420

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    Evolution of nematic and ferromagnetic ordering in suspensions of magnetic nanoplatelets

    A. Mertelj, B. Lampret, D. Lisjak, J. Klepp, J. Kohlbrecher and M. Čopič, Soft Matter, 2019, 15, 5412
    DOI: 10.1039/C9SM00949C

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