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Related Experiment Video

Updated: Dec 19, 2025

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Adaptive Wetting of Polydimethylsiloxane.

William S Y Wong1, Lukas Hauer1, Abhinav Naga1

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 5, 2020
PubMed
Summary

Polydimethylsiloxane (PDMS) wetting behavior changes with water contact. A "lubricated state" with low contact angle hysteresis occurs due to oligomer enrichment at the interface, reducing surface tension.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Cross-linked polydimethylsiloxane (PDMS) is widely used, but its wetting behavior, especially with water, requires further understanding.
  • Contact angle hysteresis is a key parameter in characterizing surface wettability and interactions.

Purpose of the Study:

  • To investigate the dynamic wetting of cross-linked PDMS by water.
  • To elucidate the mechanisms behind observed contact angle hysteresis variations.

Main Methods:

  • Measurement of advancing and receding contact angles of water drops on PDMS surfaces.
  • Investigation of PDMS samples with varying oligomer concentrations (pristine, oligomer-removed, oligomer-enriched).
  • Analysis of contact line velocity effects (up to 100 μm/s) and contact time.

Main Results:

  • Two distinct wetting modes were observed: one with low contact angle hysteresis (Δθ ≈ 10°) and one with higher hysteresis.
  • The low hysteresis, termed the

Conclusions:

  • Water contact induces enrichment of free oligomers at the water-PDMS interface, leading to a "lubricated state" with reduced interfacial tension.
  • The transition to this lubricated state follows kinetics described by adaptation theory, highlighting PDMS's responsive surface behavior.