Dipolar assembly of ferromagnetic nanoparticles into magnetically driven artificial cilia

Benkoski, Jason J.; Deacon, Ryan M.; Land, H. Bruce; Baird, Lance; Breidenich, Jennifer; Srinivasan, R.; Clatterbaugh, Guy V.; Keng, Pei Yuin; Pyun, Jeffrey

doi:10.1039/b918215b

Cited by 38 publications

(49 citation statements)

References 39 publications

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“…[260][261][262][263] This methodology was modified to enable the large scale synthesis of dipolar PS-coated CoNPs, which could be readily isolated and stored as powders prior to redispersion in organic solvents. [264] The assembly and shape persistence of colloidal polymers made from dipolar PS-CoNPs were then extensively studied by [265][266][267] The fabrication of microscopic "artificial swimmers" consisting of a Co x E y NPs after chalcogenation. [272] This, to our knowledge, was one of the first examples of a colloidal polymerization that harnessed both dipolar assembly of CoNPs and a NP conversion reaction to form chalcogenide nanowires.…”

Section: Insert Figure 24 and Figure 24 Captionmentioning

confidence: 99%

Colloidal polymers from inorganic nanoparticle monomers

Hill

Pinna

Char

et al. 2015

Progress in Polymer Science

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The use of preformed inorganic nanoparticles as "colloidal monomers" has received recent attention for the formation of one-dimensional (1-D) mesostructures, or "colloidal polymers." These colloidal monomers form linear assemblies through attractive, directional, interparticle interactions, which are similar to covalent or supramolecular interactions in classical polymer science. However, in contrast to the high degree of structural control available in the synthesis of classical molecular polymers, methods to control fundamental structural features such as chain length (DP), composition (copolymers), and architecture (linear, branched, etc.) are still being developed for NP-based colloidal polymer systems. We therefore review the colloidal polymerization of inorganic nanoparticle monomers by applying the conceptual framework provided by polymer science to categorize these novel systems. The descriptive nomenclature used for classical polymers is applied to NP assembly to define more explicitly the types of colloidal polymers formed in terms of DP, architecture, and composition (for binary NP assemblies). This Review includes descriptions of inorganic nanoparticle types useful for the formation of colloidal polymers with examples chosen to demonstrate control over mesoscopic structure and composition. The various emergent optical, electrical and electrochemical properties from these materials are also reviewed and correlated with structural control achieved in various colloidal polymer systems.

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Section: Insert Figure 24 and Figure 24 Captionmentioning

confidence: 99%

Colloidal polymers from inorganic nanoparticle monomers

Hill

Pinna

Char

et al. 2015

Progress in Polymer Science

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“…1 Since the pioneering work of Tabata et al 2 and due to advances in experimental techniques, it is possible to synthesise chains of magnetic colloids with different properties. [3][4][5][6][7][8][9][10][11][12][13] Recently, Benkoski et al 14 have reported the visualisation of ferromagnetic nanoparticles organised into one-dimensional chains, and Hill and Pyun 15 were able to design one-dimensional structures constructed from polymer-coated ferromagnetic cobalt nanoparticles. The formation of these chains has important implications.…”

Section: Introductionmentioning

confidence: 99%

The behavior of a magnetic filament in flow under the influence of an external magnetic field

Lüsebrink

Cerdà

Sánchez

et al. 2016

The Journal of Chemical Physics

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We present an extensive numerical study of the behaviour of a filament made of ferromagnetic colloidal particles subjected to the simultaneous action of a fluid flow and a stationary external magnetic field perpendicular to the flow lines. We found that in the presence of a shear flow, the tumbling motion observed at zero field is strongly inhibited when the external magnetic field is applied. The field is able to stabilise the filament with a well defined degree of alignment that depends on the balance between hydrodynamic and magnetic torques. In addition, for a Poiseuille flow, it has been found that the initial position has a long lasting influence on the behaviour of the magnetic filament when the external field is applied.

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“…It is well known that in a liquid matrix under the field action magnetizable particles can form chains and other heterogeneous aggregates, parallel to the field direction [7,[21][22][23][24]. We will consider the situation when only chains appear in this composite.…”

Section: Ferrogel With Parallel Chainsmentioning

confidence: 99%

“…On the other hand magnetic particles in ferrogels and elastomers very often form linear chains and other heterogeneous structures [7,[21][22][23][24][25]. The way of generalization of the Lorentz approach to these situations is not obvious.…”

Section: Introductionmentioning

confidence: 99%