Control surface wettability with nanoparticles from phase-change materials

G. H. Ten Brink, P. J. van het Hof, B. Chen, M. Sedighi , B. J. Kooi, G. Palasantzas*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

The wetting state of surfaces can be controlled physically from the highly hydrophobic to hydrophilic states using the amorphous-to-crystalline phase transition of Ge2Sb2Te5 (GST) nanoparticles as surfactant. Indeed, contact angle measurements show that by increasing the surface coverage of the amorphous nanoparticles the contact angle increases to high values ∼140°, close to the superhydrophobic limit. However, for crystallized nanoparticle assemblies after thermal annealing, the contact angle decreases down to ∼40° (significantly lower than that of the bare substrate) leading to an increased hydrophilicity. Moreover, the wettability changes are also manifested on the capillary adhesion forces by being stronger for the crystallized GST state.

Original languageEnglish
Article number234102
Number of pages5
JournalApplied Physics Letters
Volume109
Issue number23
DOIs
Publication statusPublished - 5-Dec-2016

Keywords

  • WATER-REPELLENT
  • SUPERHYDROPHOBICITY
  • FABRICATION
  • LOTUS

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