Regulating the aggregation of colloidal particles in an electro-osmotic micropump.

@article{Zhang2020RegulatingTA,
  title={Regulating the aggregation of colloidal particles in an electro-osmotic micropump.},
  author={Zhu Zhang and Joost de Graaf and Sanli Faez},
  journal={Soft matter},
  year={2020}
}
Unrestricted particle transport through microfluidic channels is of paramount importance to a wide range of applications, including lab-on-a-chip devices. In this article, we study via video microscopy the electro-osmotic aggregation of colloidal particles at the opening of a micrometer-sized silica channel in the presence of a salt gradient. Particle aggregation eventually leads to clogging of the channel, which may be undone by a time-adjusted reversal of the applied electric potential. We… Expand

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References

SHOWING 1-10 OF 65 REFERENCES
Dynamics of colloidal particles in microchannels under combined pressure and electric potential gradients
Dynamics of charged sub-micron or colloidal particles in a microfluidic device through cross-stream migration under combined pressure gradients and electric potential gradients was demonstrated usingExpand
Particle dynamics and rapid trapping in electro-osmotic flow around a sharp microchannel corner
We study here the curious particle dynamics resulting from electro-osmotic flow around a microchannel junction corner whose dielectric walls are weakly polarizable. The hydrodynamic velocity field isExpand
Enhancement of charged macromolecule capture by nanopores in a salt gradient.
  • T. Chou
  • Materials Science, Physics
  • The Journal of chemical physics
  • 2009
TLDR
An electrokinetic mechanism of this enhanced capture that relies on the electrostatic potential near the pore mouth is proposed that can be balanced by an outward, repulsive electro-osmotic flow that can in certain cases conspire with the salt gradient to further enhance the analyte capture rate. Expand
Experimental observations of bands of suspended colloidal particles subject to shear flow and steady electric field
  • A. Yee, M. Yoda
  • Materials Science
  • Microfluidics and Nanofluidics
  • 2018
Manipulating suspended colloidal particles flowing through a microchannel is of interest in microfluidics and nanotechnology. However, the flow itself can affect the dynamics of these suspendedExpand
Nanoparticle Translocation through Conical Nanopores: A Finite Element Study of Electrokinetic Transport
Recent years have seen a surge of interest in nanopores because such structures show a strong potential for characterizing nanoparticles, proteins, DNA, and even single molecules. These systems haveExpand
Curvature-induced dielectrophoresis for continuous separation of particles by charge in spiral microchannels.
TLDR
A continuous dc electric field driven separation of carboxyl-coated and noncoated 10 μm polystyrene beads by charge in a double-spiral microchannel is demonstrated and this curvature-induced dielectrophoresis technique may potentially be used to separate multiple particle targets by intrinsic properties for lab-on-a-chip applications. Expand
Reservoir‐based dielectrophoresis for microfluidic particle separation by charge
TLDR
This work demonstrates a microfluidic approach to separate similar‐sized fluorescent and nonfluorescent particles based upon the difference in their surface charges inside a reservoir, and demonstrated reservoir‐based dielectrophoresis particle sorter can operate in parallel to increase the flow throughput. Expand
Selective Trapping of DNA Using Glass Microcapillaries.
TLDR
The results indicate that the simple microcapillary system has the potential to capture a wide range of analyte molecules based on their electrophoretic mobility that extends well beyond the authors' experimental example of λ-phage DNA, and has implications for the development of low-cost lab-on-a-chip devices. Expand
Electrokinetic concentration of DNA polymers in nanofluidic channels.
TLDR
It is demonstrated how a nanofluidic device with integrated electrodes can preconcentrate DNA at selected locations and at physiological salt concentrations that are relevant to lab-on-a-chip applications. Expand
Continuous-flow particle and cell separations in a serpentine microchannel via curvature-induced dielectrophoresis
Particle and cell separations are critical to chemical and biomedical analyses. This study demonstrates a continuous-flow electrokinetic separation of particles and cells in a serpentine microchannelExpand
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