Communication: Bulkiness versus anisotropy: The optimal shape of polarizable Brownian nanoparticles for alignment in electric fields

Kwaadgras, Bas W.; Dijkstra, Marjolein; Roij, René van

doi:10.1063/1.3701615

Cited by 12 publications

(12 citation statements)

References 42 publications

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“…While the rods in dilute dispersions are randomly oriented, they align when an electric field is applied . From theory, it is known that the shape of the particle matters for the alignment in electric fields . Since the ends of our rods are not identical in shape, it would therefore be interesting to investigate the influence of this anisotropy on the alignment.…”

Section: Resultsmentioning

confidence: 99%

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

Kuijk

Imhof

Verkuijlen³

et al. 2014

Part & Part Syst Charact

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In this paper, the characterization and fluorescent labeling of silica rods are reported. These rods are synthesized following a recently reported method. Material properties of the silica rods measured with NMR, elemental analysis, TGA, and porosimetry are compared with those of well‐established Stöber silica spheres. Additionally, silica rods are made suitable for quantitative real‐space studies by confocal microscopy. Several methods of fluorescent labeling to prepare rods with different fluorescent patterning, ranging from uniform fluorescence levels to gradients from one rod‐end to the other, and even patterns of several colors are presented and discussed.

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Section: Resultsmentioning

confidence: 99%

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

Kuijk

Imhof

Verkuijlen³

et al. 2014

Part & Part Syst Charact

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“…Both the orientation-dependent energy and the dipolar interactions have been calculated for a wide range of odd-shaped particles such as dumbbells, bowls, cubes, rods, and platelets, using the coupled dipole method. [27][28][29] In this work, we explore the effect of an external uniaxial eld on the phase behavior of cube-shaped colloidal particles, using both experiments and simulations.…”

Section: Introductionmentioning

confidence: 99%

An experimental and simulation study on the self-assembly of colloidal cubes in external electric fields

et al. 2014

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When a suspension of colloidal particles is placed in an oscillating electric field, the contrast in dielectric constant between the particles and the solvent induces a dipole moment in each of the colloidal particles. The resulting dipole-dipole interactions can strongly influence the phase behavior of the system. We investigate the phase behavior of cube-shaped colloidal particles in electric fields, using both experiments and Monte Carlo simulations. In addition to a string fluid phase and a body centered tetragonal (BCT) crystal phase, we observe a columnar phase consisting of hexagonally ordered strings of rotationally disordered cubes. By simulating the system for a range of pressures and electric field strengths, we map out the phase diagram, and compare the results to the experimentally observed phases. Additionally, we estimate the accuracy of a point-dipole approximation on the alignment of cubes in string-like clusters.

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“…Recently, the CDM has been employed to calculate interactions between, and also the polarizability of, nanoclusters of various sizes and shapes. [35][36][37][38][39][40][41] Furthermore, the accuracy of the first-, second-and third-order approximations of the CDM have been compared to the CDM itself in the context of graphitic nanostructures, yielding similar results to ours. 40 For reasons that will be explained shortly, the CDM is only valid for non-metallic particles made of a material that satisfies a 0 /α 1/3 0 1.7, where a 0 is the lattice constant and α 0 the atomic polarizability associated with the material.…”

Section: Introductionmentioning

confidence: 54%

Can nonadditive dispersion forces explain chain formation of nanoparticles?

Kwaadgras

Verdult

Dijkstra

et al. 2013

The Journal of Chemical Physics

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We study to what extent dielectric nanoparticles prefer to self-assemble into linear chains or into more compact structures. To calculate the Van der Waals (VdW) attraction between the clusters we use the Coupled Dipole Method (CDM), which treats each atom in the nanoparticle as an inducible oscillating point dipole. The VdW attraction then results from the full many-body interactions between the dipoles. For non-capped nanoparticles, we calculate in which configuration the VdW attraction is maximal. We find that in virtually all cases we studied, many-body effects only result in local potential minima at the linear configuration, as opposed to global ones, and that these metastable minima are in most cases rather shallow compared to the thermal energy. In this work, we also compare the CDM results with those from Hamaker-de Boer and Axilrod-Teller theory to investigate the influence of the many-body effects and the accuracy of these two approximate methods.

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Communication: Bulkiness versus anisotropy: The optimal shape of polarizable Brownian nanoparticles for alignment in electric fields

Cited by 12 publications

References 42 publications

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

An experimental and simulation study on the self-assembly of colloidal cubes in external electric fields

Can nonadditive dispersion forces explain chain formation of nanoparticles?

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