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    This study validates surface free energy measurements using contact angles on self-assembled monolayers (SAMs) on polydimethylsiloxane (PDMS). These findings confirm the reliability of contact angle methods for low-energy solid surfaces.

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    Area of Science:

    • Materials Science
    • Surface Chemistry
    • Polymer Science

    Background:

    • Self-assembled monolayers (SAMs) are crucial for modifying surface properties.
    • Polydimethylsiloxane (PDMS) is a widely used elastomer in various applications.
    • Accurate measurement of surface free energy (gamma_sv) is essential for understanding surface interactions.

    Purpose of the Study:

    • To investigate the surface free energies of chemically modified PDMS surfaces.
    • To establish a correlation between surface free energy and surface composition.
    • To experimentally validate the use of contact angle measurements for estimating surface free energies of low-energy solids.

    Main Methods:

    • Fabrication of SAMs of alkylsiloxanes on PDMS substrates.
    • Measurement of surface deformations under controlled loads using semispherical lenses.
    • Estimation of surface free energies (gamma_sv) from measured deformations.
    • Comparison of results with contact angle measurements.

    Main Results:

    • Surface free energies of SAM-modified PDMS surfaces were successfully estimated.
    • Measured surface free energies showed a strong correlation with the surface chemical compositions of the SAMs.
    • The estimated surface free energies were in good agreement with values obtained from contact angle measurements.

    Conclusions:

    • The study provides direct experimental evidence supporting the validity of contact angle measurements for determining surface free energies of low-energy solids.
    • SAMs on PDMS serve as reliable model systems for surface interaction studies.
    • This work reinforces the utility of contact angle goniometry in surface characterization.