Plasma treatment switches the regime of wetting and floating of pepper seeds

Yekaterina Shapira, Victor Multanen, Gene Whyman, Yelena Bormashenko, Gilad Chaniel, Zahava Barkay, Edward Bormashenko

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Cold radiofrequency plasma treatment modified wetting and floating regimes of pepper seeds. The wetting regime of plasma-treated seeds was switched from the Wenzel-like partial wetting to the complete wetting. No hydrophobic recovery following the plasma treatment was registered. Environmental scanning electron microscopy of the fine structure of the (three-phase) triple line observed with virgin and plasma-treated seeds is reported. Plasma treatment promoted rapid sinking of pepper seeds placed on the water/air interface. Plasma treatment did not influence the surface topography of pepper seeds, while charged them electrically. Electrostatic repulsion of floating plasma-treated seeds was observed. The surface charge density was estimated from the data extracted from floating of charged seeds and independently with the electrostatic pendulum as σ ≈ 1 − 2 μC/m2.

Original languageEnglish
Pages (from-to)417-423
Number of pages7
JournalColloids and Surfaces B: Biointerfaces
Volume157
DOIs
StatePublished - 1 Sep 2017
Externally publishedYes

Keywords

  • Cold plasma
  • Floating
  • Interfacial properties
  • Pepper seeds
  • Surface charge
  • Wenzel-like wetting

ASJC Scopus subject areas

  • Biotechnology
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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