Letter | Published:

Measurement of forces between two mica surfaces in aqueous poly(ethylene oxide) solutions

Naturevolume 277pages120121 (1979) | Download Citation

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Abstract

WE have measured the forces between two curved mica surfaces immersed in a solution of 0.01% poly(ethylene oxide) (molecular weight 148,000) in 0.04 M MgSO4 (a good solvent). The experimental technique allows the measureent of (1) forces as a function of surface separation; and (2) the refractive index of the medium between the surfaces1,2. The forces exhibited large irreversibilities as well as short-term and long-term time dependent effects, and we conclude that—for observation times less than a few hours—these interactions cannot be described in terms of an equilibrium force law without specifying the previous history of approach of the surfaces.

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References

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Affiliations

  1. Research School of Physical Sciences, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2600, Australia

    • J. N. ISRAELACHVILI
    • , R. K. TANDON
    •  & L. R. WHITE
  2. Research School of Biological Sciences, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2600, Australia

    • J. N. ISRAELACHVILI

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https://doi.org/10.1038/277120a0

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