Field-Directed Self-Assembly of Mutually Polarizable Nanoparticles

Langmuir : the ACS Journal of Surfaces and Colloids
Zachary M ShermanJames W Swan

Abstract

Directed assembly of dielectric and paramagnetic nanoparticles can be used to synthesize diverse functional materials that polarize in response to an externally applied electric or magnetic field. However, theories capable of predicting the self-assembled states are lacking. In the proposed work, we develop a complete thermodynamic description of such assemblies for spherical nanoparticles. We show how an important physical feature of these types of particles, mutual polarization, sculpts the free energy landscape and has a remarkably strong influence on the nature of the self-assembled states. Modeling the mutual polarization among nanoparticles requires solving a many-bodied problem for the particle dipole moments. Typically, this computationally expensive task is avoided by neglecting mutual polarization and assuming that each particle in a concentrated dispersion acquires the same dipole moment as a single, isolated particle. Although valid in the limit of small dielectric or permeability contrasts between particles and solvent, this constant dipole assumption leads to qualitatively incorrect predictions for coexisting phases in equilibrium at large dielectric or permeability contrasts. Correctly accounting for mutual polar...Continue Reading

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Citations

Jan 3, 2020·The Journal of Chemical Physics·Kirill A KomarovStanislav O Yurchenko
Jan 26, 2021·Soft Matter·Aldo Spatafora-SalazarSibani Lisa Biswal
Apr 10, 2021·The European Physical Journal. E, Soft Matter·Pooja AryaSvetlana Santer
Jul 13, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Li-Chiun ChengPatrick S Doyle
Jul 23, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Hojin KimEric M Furst

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