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Related Experiment Videos

Excess electrical noise during current flow through porous membranes separating ionic solutions.

D L Dorset, H M Fishman

    The Journal of Membrane Biology
    |May 22, 1975
    PubMed
    Summary

    Electrical noise in artificial membranes, characterized by an f-n spectral form, is not solely due to charge carriers. This excess noise appears linked to anisotropic constraints on ion flow, challenging bulk models.

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    Area of Science:

    • Physical Chemistry
    • Materials Science
    • Electrochemistry

    Background:

    • Electrical noise in artificial membrane systems has been previously observed with an f-n spectral form.
    • Existing models, such as Hooge's bulk charge carrier model, attempt to explain this phenomenon.
    • The precise origin and contributing factors to this excess noise remain under investigation.

    Purpose of the Study:

    • To investigate the origin of excess electrical noise in various artificial membrane systems.
    • To determine if the observed noise is a bulk phenomenon or related to specific membrane structures.
    • To challenge or refine existing models of electrical noise in electrolytic systems.

    Main Methods:

    • Spectral analysis of electrical noise was performed on different artificial membrane systems, including single pore, multipore, and polymer mesh membranes.

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  • Measurements were conducted on aqueous and nonaqueous electrolytic resistors with various ionic species under applied direct current (d-c).
  • Noise data from single pore membranes were used to test the validity of the bulk charge carrier model.

    • Main Results:

    • Excess electrical noise with an f-n spectral form (n ≈ 1) was observed in single pore, multipore, and polymer mesh membranes under applied d-c current.
    • Aqueous and nonaqueous electrolytic resistors exhibited flat power density spectra, irrespective of ionic species or dilution.
    • Calculations based on single pore membrane noise data significantly deviated from Hooge's bulk charge carrier model.

    Conclusions:

    • The excess electrical noise observed in artificial membranes is not primarily a bulk phenomenon dependent on charge carrier concentration.
    • The presence of anisotropic constraints on ion flow is suggested as a key factor contributing to the observed f-n noise.
    • The findings indicate a need for revised models that incorporate membrane geometry and ion transport limitations.