Pearl Chain Formation across Radio Frequency Fields

Griffin, Jasper; Ferris, Clifford D.

doi:10.1038/226152a0

Cited by 19 publications

(13 citation statements)

References 4 publications

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“…49 Some experiments were carried out on the orientation of particles in frequency-selectable directions, 50 predicting the threshold potential or individual and chain velocities of microparticles and cells under DEP forces. 51,52 The motion of particles along DEP forces showed subtle vibrations due to Brownian motion. 37…”

Section: Motion Of the Ps Beadsmentioning

confidence: 99%

A review of polystyrene bead manipulation by dielectrophoresis

Chen

Yuan

2019

RSC Adv.

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Section: Motion Of the Ps Beadsmentioning

confidence: 99%

A review of polystyrene bead manipulation by dielectrophoresis

Chen

Yuan

2019

RSC Adv.

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“…Nevertheless, bundles of chains may form at high particle density [63,8]. However, dissimilar particles may form chains across the field lines [26]. This is sometimes seen in an originally uniform population of cells under electro-fusion conditions [27] as shown in Figure 2.…”

Section: Field-perpendicular Chainingmentioning

confidence: 99%

“…However, DEP assembly of dissimilar particles perpendicular to the field direction has been observed [26,27] and explained [28]. The considerable field strengths and non-uniform field distributions typical of DEP work can often give rise to thermal [29] or electrothermal [9,30] convection, and these flows can themselves contribute to particle patterning.…”

Section: Introductionmentioning

confidence: 99%

Particle patterning using fluidics and electric fields

Arnold

2008

IEEE Trans. Dielect. Electr. Insul.

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Electric-field manipulation of micro-particles in suspension can create patterns via a number of particle forces and fluid flows. These effects are assessed for their suitability for down-scaling to form nano-patterns such as may be incorporated into structured nano-composites. Consideration is given not only to the assembly of field-aligned chains or wires, but also to methods that can give cross-field assembly and even 2-D patterns or crystals. Dielectrophoresis is often the dominant driving force behind particle assembly, but other dipole-dipole interactions and also electrically-driven fluid flows are increasingly recognized as significant or dominant. Orientation of nonspherical particles in frequency-selectable directions is also possible. Estimates for the threshold field strengths required for using these effects to handle nano-particles are considered. Finally the use of media with modified permittivity to increase the fieldinduced forces or to optimize the selectivity of particle incorporation is discussed. Index Terms -Composite; Artificial tissue; Dielectrophoresis; Electroosmosis W. Michael Arnold (A'95-SM'00) was raised in Yorkshire, U.K. He received the B.A. degree from Cambridge University in 1974, and the M.Sc. and Ph.D. (EE) degrees from the University of Wales.After developing the technique of electro-rotation and also teaching in Biotechnology at the University of Würzburg, Germany, he received the Dr. rer. nat. habil. degree from that University in 1993. In 1995 he chaired the IAS session on "Biological Applications of Electrostatics", and in 2001 he cochaired a DEIS workshop on "Fast Field Effects in Biosystems". Present research interests are nanoassembly, microfluidic devices and bio-impedance spectroscopy.

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“…For identical particles, the sign of the interaction energy is determined solely by their relative orientation with the applied field. For unlike particles, however, attraction transverse to the applied field is possible if the real and imaginary parts of the polarizabilities have the appropriate signs, i.e., Re A B < 0 [16,17]. The Clausius-Mossotti equation for a dielectric sphere in a dielectric medium [15] i 4" s " 0 a 3 i " p;i ÿ " s =" p;i 2" s shows that the polarizability is real and attraction arises for " p;A > " s > " p;B .…”

Section: P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

Electrically Guided Assembly of Planar Superlattices in Binary Colloidal Suspensions

2003

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Binary colloidal suspensions are assembled into planar superlattices using ac electric fields. Either triangular or square-packed arrays form, depending on the frequency and relative particle concentrations. The frequency dependence is striking since superlattices develop at low and high frequencies but not at intermediate frequencies. We explain the low frequency behavior (<3 kHz) in terms of induced-dipole repulsion balanced by attraction resulting from electrohydrodynamic (EHD) flow. At high frequencies (20-200 kHz), EHD flow is negligible but aggregation occurs since dipole-dipole interactions become attractive.

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Pearl Chain Formation across Radio Frequency Fields

Cited by 19 publications

References 4 publications

A review of polystyrene bead manipulation by dielectrophoresis

A review of polystyrene bead manipulation by dielectrophoresis

Particle patterning using fluidics and electric fields

Electrically Guided Assembly of Planar Superlattices in Binary Colloidal Suspensions

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