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Related Concept Videos

Van de Graaff Generator01:15

Van de Graaff Generator

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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.
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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Related Experiment Video

Updated: Apr 14, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
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Dynamic and precise electromagnetic levitation of single cells.

Malavika Ramarao1, Victor Garcia-Gradilla2,3, Mehmet Burcin Unlu4,5

  • 1Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Palo Alto, CA 94304.

Proceedings of the National Academy of Sciences of the United States of America
|September 8, 2025
PubMed
Summary
This summary is machine-generated.

Electro-LEV uses electromagnetic and magnetic levitation for precise 3-D cell control and separation. This technology enhances cell sorting efficiency and aids in analyzing cellular heterogeneity for biomedical applications.

Keywords:
electromagnetic levitationmagnetic levitationreal-time controlsingle cellssorting

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Area of Science:

  • Biophysics
  • Cell Biology
  • Microfluidics

Background:

  • Cellular biophysical properties are key to understanding cell function.
  • Precise 3-D manipulation of cells, especially in heterogeneous populations, is a significant challenge.
  • Existing methods struggle with dynamic control and efficient separation in microfluidic systems.

Purpose of the Study:

  • To introduce Electro-LEV, a novel platform for dynamic 3-D cell control and separation.
  • To demonstrate the capability of Electro-LEV in differentiating and sorting cells based on their levitation behavior.
  • To showcase Electro-LEV's potential for high-resolution cell analysis and label-free sorting.

Main Methods:

  • Integration of electromagnetic and magnetic levitation principles for 3-D cell manipulation.
  • Dynamic control of cell position along the z-axis via current adjustments in electromagnets.
  • Tracking cell levitation behavior to distinguish single cells from clusters.

Main Results:

  • Small current adjustments significantly altered levitation heights for diverse cell types.
  • Distinct levitation responses were observed between single cells and cell clusters.
  • Electro-LEV achieved significant enrichment of live cells, improving sorting purity and efficiency.

Conclusions:

  • Electro-LEV provides dynamic 3-D control for cell separation and analysis.
  • The platform effectively differentiates cellular heterogeneity and improves cell sorting.
  • Electro-LEV offers broad applicability in biomedical fields, including single-cell sequencing and drug screening.