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Related Concept Videos

Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

263
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...
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Electrophoresis: Overview01:20

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Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
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Low-frequency electrokinetics in a periodic pillar array for particle separation.

Víctor Calero1, Raúl Fernández-Mateo2, Hywel Morgan2

  • 1Depto. Electrónica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012, Sevilla, Spain; International Iberian Nanotechnology Laboratory (INL), Braga 4715-330, Portugal.

Journal of Chromatography. A
|August 6, 2023
PubMed
Summary
This summary is machine-generated.

Deterministic Lateral Displacement (DLD) with low-frequency AC electric fields uses Electrophoresis (EP) and Concentration-Polarisation Electroosmosis (CPEO) for particle repulsion. This enhances micro- and nano-particle sorting, even for particles smaller than the DLD critical size.

Keywords:
Concentration Polarisation ElectroosmosisDeterministic Lateral DisplacementElectrokineticsMicrofluidicsParticle sorting

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Area of Science:

  • Microfluidics
  • Nanotechnology
  • Biophysics

Background:

  • Deterministic Lateral Displacement (DLD) is a microfluidic technique for particle separation using pillar arrays.
  • AC electrokinetic forces significantly enhance DLD tunability and applications.
  • At low frequencies, particle behavior in DLD is complex, involving multiple electrokinetic effects.

Purpose of the Study:

  • To numerically analyze particle motion mechanisms in DLD arrays under low-frequency AC electric fields.
  • To elucidate the roles of Electrophoresis (EP) and Concentration-Polarisation Electroosmosis (CPEO) in particle behavior.
  • To develop a predictive model for electrically induced particle deviation in DLD.

Main Methods:

  • Detailed numerical simulations of particle dynamics.
  • Analysis of low-frequency AC electric field interactions.
  • Modeling of Electrophoresis (EP) and Concentration-Polarisation Electroosmosis (CPEO) effects.

Main Results:

  • Identified EP and CPEO-driven wall-particle repulsion as key mechanisms.
  • Demonstrated that these forces govern particle behavior at low frequencies.
  • Showed model prediction of electrically induced deviation for sub-critical size particles.

Conclusions:

  • Low-frequency AC electric fields, through EP and CPEO, enable precise control over particle trajectories in DLD.
  • The developed model accurately predicts particle behavior and expands DLD capabilities.
  • This research offers enhanced methods for micro- and nano-particle sorting and manipulation.