Tunable wettability of polymer films by partial engulfment of nanoparticles

Weiteng Guo, Chongnan Ye, Gert H. ten Brink, Katja Loos, Vitaly B. Svetovoy, and George Palasantzas
Phys. Rev. Materials 5, 015604 – Published 25 January 2021
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Abstract

A series of poly(methyl methacrylate) (PMMA) surfaces decorated by Cu nanoparticles (NP) with gradually varied morphology were prepared by high-pressure CO2 treatment at various time spans. Combining the characterizations of transmission electron microscopy (TEM) and atomic force microscopy (AFM), an accurate three-dimensional view of the morphology of the surfaces was presented. Subsequently, the wettability of the surfaces decreases near linearly with the increase of the apparent height of the decorating NPs in both static (static contact angle) and dynamic (contact angle hysteresis) aspects. The observed tendency contradicts to the Wenzel or Cassie-Baxter model and is explained by the contribution of nanomeniscus formed between the decorating NP and the flat substrate. The capillary pressure from this meniscus is negative and results in the increase of the contact angle with the apparent height (HN) of the Cu NPs decorating the PMMA surface. In addition, the effect of the coverage (CN) by NPs on the wettability can be explained on the same basis. Our experiment demonstrates the important influence of the nanomeniscus on the wettability, which is usually not taken into account. The results in this work provide a comprehensive understanding of how nanostructure affects the wettability of the decorated surfaces and shed light on how to obtain certain wettability through nanostructuring of the surface morphology.

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  • Received 7 October 2020
  • Accepted 12 January 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.015604

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Weiteng Guo1, Chongnan Ye1, Gert H. ten Brink1, Katja Loos1, Vitaly B. Svetovoy2, and George Palasantzas1,*

  • 1Zernike Institute forAdvanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
  • 2A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Prospect 31 Bld. 4, 119071 Moscow, Russia

  • *Corresponding author: g.palasantzas@rug.nl

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Issue

Vol. 5, Iss. 1 — January 2021

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