Movement of Colloidal Particles in Two-Dimensional Electric Fields

Langmuir ◽  
2005 ◽  
Vol 21 (24) ◽  
pp. 10941-10947 ◽  
Author(s):  
Junhyung Kim ◽  
Stephen Garoff ◽  
John L. Anderson ◽  
Luc J. M. Schlangen
Keyword(s):  
Electric Fields ◽  
Colloidal Particles ◽  
Two Dimensional

scholarly journals Tunable two-dimensional assembly of colloidal particles in rotating electric fields

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Egor V. Yakovlev ◽  
Kirill A. Komarov ◽  
Kirill I. Zaytsev ◽  
Nikita P. Kryuchkov ◽  
Kirill I. Koshelev ◽  
...  
Keyword(s):  
Electric Fields ◽  
Colloidal Particles ◽  
Two Dimensional

Rotational diffusion measurements of suspended colloidal particles using two‐dimensional exchange nuclear magnetic resonance

1996 ◽  
Vol 104 (2) ◽  
pp. 509-520 ◽  
Author(s):  
G. A. Barrall ◽  
K. Schmidt‐Rohr ◽  
Y. K. Lee ◽  
K. Landfester ◽  
H. Zimmermann ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Colloidal Particles ◽  
Rotational Diffusion ◽  
Two Dimensional ◽  
Nuclear Magnetic

Simulation of Two-Dimensional Nematic Director Structures in Inhomogeneous Electric Fields

1991 ◽  
Vol 198 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Gunther Haas ◽  
Henning Wöhler ◽  
Michael W. Fritsch ◽  
Dieter A. Mlynski
Keyword(s):  
Electric Fields ◽  
Two Dimensional ◽  
Nematic Director

Numerical study of electric field effects on the deformation of two-dimensional liquid drops in simple shear flow at arbitrary Reynolds number

2009 ◽  
Vol 626 ◽  
pp. 367-393 ◽  
Author(s):  
STEFAN MÄHLMANN ◽  
DEMETRIOS T. PAPAGEORGIOU
Keyword(s):  
Steady State ◽  
Shear Flow ◽  
Electric Field ◽  
Electric Fields ◽  
Simple Shear ◽  
Simple Shear Flow ◽  
Physical Parameters ◽  
Shear Stresses ◽  
Two Dimensional ◽  
Liquid Drops

The effect of an electric field on a periodic array of two-dimensional liquid drops suspended in simple shear flow is studied numerically. The shear is produced by moving the parallel walls of the channel containing the fluids at equal speeds but in opposite directions and an electric field is generated by imposing a constant voltage difference across the channel walls. The level set method is adapted to electrohydrodynamics problems that include a background flow in order to compute the effects of permittivity and conductivity differences between the two phases on the dynamics and drop configurations. The electric field introduces additional interfacial stresses at the drop interface and we perform extensive computations to assess the combined effects of electric fields, surface tension and inertia. Our computations for perfect dielectric systems indicate that the electric field increases the drop deformation to generate elongated drops at steady state, and at the same time alters the drop orientation by increasing alignment with the vertical, which is the direction of the underlying electric field. These phenomena are observed for a range of values of Reynolds and capillary numbers. Computations using the leaky dielectric model also indicate that for certain combinations of electric properties the drop can undergo enhanced alignment with the vertical or the horizontal, as compared to perfect dielectric systems. For cases of enhanced elongation and alignment with the vertical, the flow positions the droplets closer to the channel walls where they cause larger wall shear stresses. We also establish that a sufficiently strong electric field can be used to destabilize the flow in the sense that steady-state droplets that can exist in its absence for a set of physical parameters, become increasingly and indefinitely elongated until additional mechanisms can lead to rupture. It is suggested that electric fields can be used to enhance such phenomena.

Electrolyte-Dependent Aggregation of Colloidal Particles near Electrodes in Oscillatory Electric Fields

Langmuir ◽  
2014 ◽  
Vol 30 (17) ◽  
pp. 4887-4894 ◽  
Author(s):  
Taylor J. Woehl ◽  
Kelley L. Heatley ◽  
Cari S. Dutcher ◽  
Nicholas H. Talken ◽  
William D. Ristenpart
Keyword(s):  
Electric Fields ◽  
Colloidal Particles

Size-Dependent Separation of Colloidal Particles In Two-Dimensional Convective Self-Assembly

Langmuir ◽  
1995 ◽  
Vol 11 (8) ◽  
pp. 2975-2978 ◽  
Author(s):  
Mariko Yamaki ◽  
Junichi Higo ◽  
Kuniaki Nagayama
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Two Dimensional ◽  
Size Dependent

scholarly journals Anomalous Long-Range Attraction in Colloidal Binary Mixtures at Fluid–Fluid Interfaces

2020 ◽  
Vol 4 (3) ◽  
pp. 36
Author(s):  
Zonglin Yi ◽  
To Ngai
Keyword(s):  
Long Range ◽  
Colloidal Particles ◽  
Experimental Result ◽  
Colloidal System ◽  
Fluid Interfaces ◽  
Water Interface ◽  
Two Dimensional ◽  
Colloidal Systems ◽  
Oil Water ◽  
Theoretical Side

The properties of binary colloidal systems have gained the interest of researchers because they have much richer structures than their one-component counterpart. Continuing efforts are being made on the theoretical side on binary colloidal systems, while many issues remained unsolved for the lack of solid experimental supports, especially for study in the field of two-dimensional (2D) binary colloids system. Oil–water interfaces can serve as a good stringent 2D confinement for colloidal particles and can avoid anomalous problems caused by the quasi-two-dimensional environment in previous experimental reports. In this work, we conduct experimental research of binary colloids system in an oil–water interface to revisit theoretical predication. We measure an ultra-long-range attraction and discuss the possible mechanism of this attraction by comparing the experimental result with existing model and theory. This study could contribute more understanding of the binary colloidal system in both experimental aspects and theoretical aspects.

Particle Compaction with Alternating Electric Fields: The Effects of Electrode Geometry

1986 ◽  
Vol 73 ◽  
Author(s):  
Alan J. Hurd
Keyword(s):  
Electric Fields ◽  
Colloidal Particles ◽  
Dielectric Material ◽  
Double Layers ◽  
Electrode Geometry ◽  
Dipole Interactions ◽  
Alternating Electric Fields ◽  
Alternating Electric Field ◽  
Dc Bias ◽  
Induced Dipoles

ABSTRACTA technique for inducing ordered, close-packed arrangements of various symmetries among colloidal particles is discussed. An external alternating electric field applied to the colloid induces dipole interactions of variable strength by polarizing either the dielectric material of the particles or their electrostatic double layers. Ordering in various symmetries can be obtained by switching the field rapidly between pairs of electrodes, thereby changing the orientation of the induced dipoles. A small dc bias serves to deposit and compact the aligned particles.

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