Towards Holonomic Control of Janus Particles in Optomagnetic Traps

Erb, Randall M.; Jenness, Nathan J.; Clark, Robert L.; Yellen, Benjamin B.

doi:10.1002/adma.200900892

Cited by 81 publications

(73 citation statements)

References 47 publications

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“…Erb et al are the first ones to prepare patchy particles with a tiny magnetic cobalt patch in the shape of a dot using the templating technique and termed them dotJanus particles. [150] The small patch makes the dot-Janus particles compatible for the use in optical traps and enables unprecedented control over particle manipulation.…”

Section: Field-induced Assembly Of Janus and Patchy Particlesmentioning

confidence: 99%

Fabrication, Assembly, and Application of Patchy Particles

Pawar

Kretzschmar

2010

Macromol. Rapid Commun.

450

411

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The site‐specific engineering of colloidal surfaces has provided a powerful approach to pushing the boundaries of today's materials research. The resulting surface‐anisotropic and patchy particles have become the center of vital research areas, ranging from the need for large‐scale fabrication techniques to exploring new applications of these materials. This Review summarizes patchy particle fabrication techniques, including but not limited to particle and nanosphere lithography and glancing‐angle deposition. The variety of existing patchy particle fabrication techniques is revealed and the need for a scalable approach to high‐volume patchy particle production is identified. Ongoing modeling efforts describing patchy particle interactions and properties are reviewed as potential predictive tools. Research endeavors that deal with the directed assembly of patchy particles in electric and magnetic fields, as well as with supraparticular assembly through chemical interactions, are discussed. The Review is concluded with a note on the future application of patchy particles as phoretic motors.magnified image

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Section: Field-induced Assembly Of Janus and Patchy Particlesmentioning

confidence: 99%

Fabrication, Assembly, and Application of Patchy Particles

Pawar

Kretzschmar

2010

Macromol. Rapid Commun.

450

411

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“…To implement the goal of monodisperse size and homogeneous magnetic response, we take the approach of directionally depositing thin magnetic coatings onto monodisperse colloids [27][28][29]40,41 . To realize shape anisotropy, we first prepare silica rods that are 2.4 ± 0.1 mm long and 0.81 ± 0.04 mm wide (that is, an aspect ratio of 3), using a known method 42 .…”

Section: Synthesis Of Magnetic Janus Rodsmentioning

confidence: 99%

“…Although some particles of this kind were known from earlier work by others, previous emphasis was on their assembly or dynamics in the presence of external magnetic field [25][26][27][28][29][30][31] . Here, taking advantage of rapid progress in the synthesis of anisotropic colloids [32][33][34][35][36][37] , we go beyond this to delve into the role of shape and constituent anisotropy.…”

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confidence: 99%

Colloidal ribbons and rings from Janus magnetic rods

et al. 2013

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Dipolar particles are fundamental building blocks in nature and technology, yet the effect of particle anisotropy is seldom explored. Here, we fabricate colloidal silica rods coated with a hemicylindrical magnetic layer to satisfy multiple criteria: nearly monodisperse, easily imaged and magnetic interaction that dominates over gravity. We confirm long-predicted features of dipolar assembly and stress the microstructural variety brought about by shape and constituent anisotropy, especially by extrapolating knowledge learned from literal molecules. In this colloidal system, we describe analogies to liquid crystalline deformations with bend, splay and twist; an analogy to cis/trans isomerism in organic molecules, which in our system can be controllably and reversibly switched; and a field-switching methodology to direct single ribbons into not only single but also multiple rings that can subsequently undergo hierarchical self-assembly. We highlight subtle material issues of control and design rules for reconfigurable dipolar materials with building blocks of complex shape.

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“…Multi-component colloidal systems [26][27][28][29][30][31][32][33][34][35] (that is, 'colloidal alloys') as well as systems of particles with non-trivial internal structure, such as Janus particles [36][37][38][39] and particles with shape anisotropy [40][41][42] , are currently being explored due to their ability to tailor the particle interactions and enable the assembly of diverse crystalline structures. Current methods for assembling ordered structures with two or three particle types include kinetic techniques based on controlled drying [26][27][28][29][30][31] and thermodynamic techniques [32][33][34][35]43,44 that rely on spontaneous assembly into minimum free-energy configurations.…”

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confidence: 99%

Binary colloidal structures assembled through Ising interactions

et al. 2012

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new methods for inducing microscopic particles to assemble into useful macroscopic structures could open pathways for fabricating complex materials that cannot be produced by lithographic methods. Here we demonstrate a colloidal assembly technique that uses two parameters to tune the assembly of over 20 different pre-programmed structures, including kagome, honeycomb and square lattices, as well as various chain and ring configurations. We programme the assembled structures by controlling the relative concentrations and interaction strengths between spherical magnetic and non-magnetic beads, which behave as paramagnetic or diamagnetic dipoles when immersed in a ferrofluid. A comparison of our experimental observations with potential energy calculations suggests that the lowest energy configuration within binary mixtures is determined entirely by the relative dipole strengths and their relative concentrations.

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Towards Holonomic Control of Janus Particles in Optomagnetic Traps

Cited by 81 publications

References 47 publications

Fabrication, Assembly, and Application of Patchy Particles

Fabrication, Assembly, and Application of Patchy Particles

Colloidal ribbons and rings from Janus magnetic rods

Binary colloidal structures assembled through Ising interactions

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