Self-organization in dipolar cube fluids constrained by competing anisotropies

L. Rossi, J.G. Donaldson, J.M. Meijer, A.V. Petukhov, D. Kleckner, S.S. Kantorovich, W.T.M. Irvine, A.P. Philipse, S. Sacanna

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Abstract

For magnetite spherical nanoparticles, the orientation of the dipole moment in the crystal does not affect the morphology of either zero field or field induced structures. For non-spherical particles however, an interplay between particle shape and direction of the magnetic moment can give rise to unusual behaviors, in particular when the moment is not aligned along a particle symmetry axis. Here we disclose for the first time the unique magnetic properties of hematite cubic particles and show the exact orientation of the cubes' dipole moment. Using a combination of experiments and computer simulations, we show that dipolar hematite cubes self-organize into dipolar chains with morphologies remarkably different from those of spheres, and demonstrate that the emergence of these structures is driven by competing anisotropic interactions caused by the particles' shape anisotropy and their fixed dipole moment. Furthermore, we have analytically identified a specific interplay between energy, and entropy at the microscopic level and found that an unorthodox entropic contribution mediates the organization of particles into the kinked nature of the dipolar chains.

Original languageEnglish
Pages (from-to)1080-1087
Number of pages8
JournalSoft Matter
Volume14
Issue number7
DOIs
Publication statusPublished - 2018

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Dipole moment
Anisotropy
anisotropy
Fluids
fluids
Ferrosoferric Oxide
dipole moments
hematite
Magnetic moments
Crystal orientation
Magnetic properties
Entropy
Nanoparticles
Crystals
Computer simulation
magnetite
computerized simulation
magnetic moments
Experiments
entropy

Cite this

Rossi, L., Donaldson, J. G., Meijer, J. M., Petukhov, A. V., Kleckner, D., Kantorovich, S. S., ... Sacanna, S. (2018). Self-organization in dipolar cube fluids constrained by competing anisotropies. Soft Matter, 14(7), 1080-1087. https://doi.org/10.1039/c7sm02174g
Rossi, L. ; Donaldson, J.G. ; Meijer, J.M. ; Petukhov, A.V. ; Kleckner, D. ; Kantorovich, S.S. ; Irvine, W.T.M. ; Philipse, A.P. ; Sacanna, S. / Self-organization in dipolar cube fluids constrained by competing anisotropies. In: Soft Matter. 2018 ; Vol. 14, No. 7. pp. 1080-1087.
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Rossi, L, Donaldson, JG, Meijer, JM, Petukhov, AV, Kleckner, D, Kantorovich, SS, Irvine, WTM, Philipse, AP & Sacanna, S 2018, 'Self-organization in dipolar cube fluids constrained by competing anisotropies', Soft Matter, vol. 14, no. 7, pp. 1080-1087. https://doi.org/10.1039/c7sm02174g

Self-organization in dipolar cube fluids constrained by competing anisotropies. / Rossi, L.; Donaldson, J.G.; Meijer, J.M.; Petukhov, A.V.; Kleckner, D.; Kantorovich, S.S.; Irvine, W.T.M.; Philipse, A.P.; Sacanna, S.

In: Soft Matter, Vol. 14, No. 7, 2018, p. 1080-1087.

Research output: Contribution to journalArticleAcademicpeer-review

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Rossi L, Donaldson JG, Meijer JM, Petukhov AV, Kleckner D, Kantorovich SS et al. Self-organization in dipolar cube fluids constrained by competing anisotropies. Soft Matter. 2018;14(7):1080-1087. https://doi.org/10.1039/c7sm02174g