Anomalous Particle Rotation and Resulting Microstructure of Colloids in AC Electric Fields

Lele, Pushkar P.; Mittal, Manish; Furst, Eric M.

doi:10.1021/la802225u

Cited by 33 publications

(34 citation statements)

References 37 publications

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“…There, chaining is expected in absence of hydrodynamic interactions. 68 However, aggregation is observed, 69 and good agreement between experiment and models that contain both ion polarization and hydrodynamic coupling was achieved. 63,70 While hydrodynamic interactions may have an influence in microchannels and free solution, the presence of collapse in nanochannels 14 is strong indication that they are not the leading cause.…”

Section: Discussionmentioning

confidence: 86%

Collapse of DNA under alternating electric fields

Zhou

Riehn

2015

Phys. Rev. E

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Recent studies have shown that double-stranded DNA can collapse in presence of a strong electric field. Here we provide an in-depth study of the collapse of DNA under weak confinement in microchannels as a function of buffer strength, driving frequency, applied electric field strength, and molecule size. We find that the critical electric field at which DNA molecules collapse (10s of kV/cm) is strongly dependent on driving frequency dependent (100 … 800 Hz) and molecular size (20 … 160 kbp), and weakly dependent on the ionic strength (8 … 60 mM). We argue that an apparent stretching at very high electric fields is an artifact of the finite frame time of video microscopy. PACS numbers: 87.14.gk, 36.20.Ey, 82.35.Lr, 82.35.Rs

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Section: Discussionmentioning

confidence: 86%

Collapse of DNA under alternating electric fields

Zhou

Riehn

2015

Phys. Rev. E

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“…1͑d͒, due to the alignment of induced particle dipoles exceeding thermal fluctuation. 11,13,14,17 Upon -sweep from 25 kHz to 20 MHz, the p-DEP behavior is preserved for C 8 -treated JPs. However, in salted aqueous media of m = 0.02 mS/ cm, we surprisingly observe a n → p DEP transition as increasing across 100 kHz, below which no particle motion and aggregation toward the microelectrodes is observed, indicating n-DEP.…”

mentioning

confidence: 97%

Dielectrophoresis of Janus particles under high frequency ac-electric fields

Zhang

Zhu

2010

Applied Physics Letters

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“…These conditions were chosen to minimize AC-electrohydrodynamics, water electrolysis, and other undesired effects on the particle assembly. 22,42,43 The relative angle between the external electric and magnetic fields, 'j', could be tuned by changing the spatial orientation of the electromagnetic pair with respect to the electrodes (Fig. 1a).…”

Section: Resultsmentioning

confidence: 99%

Multidirectional colloidal assembly in concurrent electric and magnetic fields

et al. 2016

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a Dipolar interactions between nano-and micron sized colloids lead to their assembly into domains with well-defined local order. The particles with a single dipole induced by an external field assemble into linear chains and clusters. However, to achieve the formation of multidirectionally organized nano-or microassemblies with tunable physical characteristics, more sophisticated interaction tools are needed.Here we demonstrate that such complex interactions can be introduced in the form of two independent, non-interacting dipoles (double-dipoles) within a microparticle. We show how this can be achieved by the simultaneous application of alternating current (AC)-electric field and uniform magnetic field to dispersions of superparamagnetic microspheres. Depending on their timing and intensity, concurrent electric and magnetic fields lead to the formation of bidirectional particle chains, colloidal networks, and discrete crystals. We investigate the mechanistic details of the assembly process, and identify and classify the non-equilibrium states formed. The morphologies of different experimental states are in excellent correlation with our theoretical predictions based on Brownian dynamics simulations combined with a structural analysis based on local energy parameters. This novel methodology of introducing and interpreting double-dipolar particle interactions may assist in the assembly of colloidal coatings, dynamically reconfigurable particle networks, and bidirectional active structures.

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Anomalous Particle Rotation and Resulting Microstructure of Colloids in AC Electric Fields

Cited by 33 publications

References 37 publications

Collapse of DNA under alternating electric fields

Collapse of DNA under alternating electric fields

Dielectrophoresis of Janus particles under high frequency ac-electric fields

Multidirectional colloidal assembly in concurrent electric and magnetic fields

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