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Updated: Jun 16, 2026

Sample Preparation using a Lipid Monolayer Method for Electron Crystallographic Studies
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Wilhelmy plate artifacts in elastic monolayers.

T A Witten, Jin Wang, L Pocivavsek

    The Journal of Chemical Physics
    |February 2, 2010
    PubMed
    Summary

    Wilhelmy plate measurements can be misinterpreted for elastic Langmuir monolayers under anisotropic stress. This study corrects prior analysis, revealing Wilhelmy stress can oppose ambient stress, impacting surface tension interpretation.

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    Area of Science:

    • Surface science
    • Materials science
    • Physical chemistry

    Background:

    • Investigating Wilhelmy plate measurements for elastic Langmuir monolayers.
    • Anisotropic stress complicates interpretation of surface tension measurements.
    • Previous analysis indicated discrepancies between measured and ambient stress.

    Discussion:

    • Correcting a significant error in prior theoretical analysis.
    • Demonstrating conditions where Wilhelmy stress differs from ambient stress.
    • Highlighting the possibility of opposite signs between Wilhelmy and ambient stress.

    Key Insights:

    • Refined theoretical framework for Wilhelmy plate measurements on anisotropic Langmuir monolayers.
    • Wilhelmy stress can be significantly different from, and even opposite to, the ambient stress.
    • Crucial implications for accurate surface tension determination in complex interfacial systems.

    Outlook:

    • Improved understanding of interfacial mechanics in soft matter.
    • Potential for more accurate characterization of elastic Langmuir films.
    • Advancing the study of complex fluid interfaces and thin films.

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