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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Van de Graaff Generator01:15

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Updated: May 30, 2026

Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
07:57

Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics

Published on: November 10, 2014

On-demand electrostatic droplet charging and sorting.

Byungwook Ahn1, Kangsun Lee, Rajagopal Panchapakesan

  • 1SMALL (Sensors and MicroActuators Learning Lab), Department of Electrical Engineering, University at Buffalo, The State University of New York (SUNY-Buffalo), Buffalo, New York 14260, USA.

Biomicrofluidics
|July 21, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a microfluidic device for electrostatic droplet charging and sorting. The system enables precise control over droplet charge for advanced on-chip manipulation.

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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Safe Experimentation in Optical Levitation of Charged Droplets Using Remote Labs
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Published on: January 10, 2019

Area of Science:

  • Microfluidics
  • Electrostatics
  • Biotechnology

Background:

  • Droplet-based microfluidics is crucial for various applications, including biological assays and materials synthesis.
  • Precise control over droplet manipulation, including charging, is essential for advanced microfluidic applications.

Purpose of the Study:

  • To develop a microfluidic device capable of on-demand electrostatic charging and sorting of droplets.
  • To enable real-time manipulation of droplets based on their charge state.

Main Methods:

  • A droplet-based microfluidic device integrating hydrodynamic flow focusing for droplet generation.
  • Incorporation of paired electrodes for electrostatic charging and electric field-based sorting of water-in-oil droplets.

Main Results:

  • Successful generation of water-in-oil droplets using hydrodynamic flow focusing.
  • Demonstrated on-demand electrostatic charging of droplets (positive, negative, or neutral).
  • Achieved automatic, real-time sorting of charged droplets via electric fields.

Conclusions:

  • The developed microfluidic device offers precise control over droplet charge.
  • This technology facilitates advanced on-chip manipulation of preformed droplets.
  • The system has potential applications in various fields requiring controlled droplet handling.