Lotus-leaf inspired surfaces: hydrophobicity evolution of replicas due to mechanical cleaning and mould wear

Jean-Michel Romano, Antonio Garcia Giron, Pavel Penchev, Mert Gulcur, Ben Whiteside, Stefan Dimov

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Abstract

Inspired from the low wetting properties of Lotus leaves, the fabrication of dual micro/nano-scale topographies is of interest to many applications. In this research, superhydrophobic surfaces are fabricated by a process chain combining ultrashort pulsed laser texturing of steel inserts and injection moulding to produce textured polypropylene parts. This manufacturing route is very promising and could be economically viable for mass production of polymeric parts with superhydrophobic properties. However, surface damages, such as wear and abrasion phenomena, can be detrimental to the attractive wetting properties of replicated textured surfaces. Therefore, the final product lifespan is investigated by employing mechanical cleaning of textured polypropylene surfaces with multipurpose cloths following the ASTM D3450 standard. Secondly, the surface damage of replication masters after 350 injection moulding cycles with glass-fiber reinforced polypropylene, especially to intensify mould wear, was investigated. In both cases, the degradation of the dual-scale surface textures had a clear impact on surface topography of the replicas and thus on their wetting properties, too.
Original languageEnglish
Article number010913
JournalJournal of Micro and Nano-Manufacturing
Volume8
Issue number1
Early online date13 Feb 2020
DOIs
Publication statusPublished - 31 Mar 2020

Keywords

  • Wear
  • abrasion
  • microtexture
  • wettability
  • micro injection moulding,
  • laser texturing

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