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Sizing particles with a Coulter counter.

J Hurley

    Biophysical Journal
    |January 1, 1970
    PubMed
    Summary
    This summary is machine-generated.

    A new theorem determines Coulter counter signals for arbitrary particle shapes. For spheres, signal equals volume; for spheroids, it depends complexly on shape, not just volume.

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    Area of Science:

    • Biophysics
    • Particle Science
    • Analytical Chemistry

    Background:

    • Coulter counters are widely used for particle size analysis.
    • Understanding signal generation is crucial for accurate measurements.
    • Particle shape influences Coulter counter signal amplitude.

    Purpose of the Study:

    • To present a general theorem for determining Coulter counter signal amplitude.
    • To apply the theorem to specific particle shapes (sphere and prolate spheroid).
    • To analyze the relationship between particle shape, volume, and signal output.

    Main Methods:

    • Development of a theoretical theorem for signal amplitude determination.
    • Application of the theorem to idealized spherical particles.
    • Application of the theorem to idealized prolate spheroidal particles.

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    Main Results:

    • The signal for a sphere is directly proportional to its volume.
    • The signal for a prolate spheroid is a complex function of its shape.
    • Particles with identical volumes but different shapes yield distinct signals.

    Conclusions:

    • The presented theorem provides a framework for understanding Coulter counter signals.
    • Particle shape is a critical determinant of signal amplitude, particularly for non-spherical particles.
    • Accurate particle characterization requires considering both volume and shape.