Flow-Induced Long-Term Stable Slippery Surfaces

Philipp Baumli, Hannu Teisala, Hoimar Bauer, Diana Garcia-Gonzalez, Viraj Damle, Florian Geyer, Maria D'Acunzi, Anke Kaltbeitzel, Hans Jürgen Butt, Doris Vollmer*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
17 Downloads (Pure)

Abstract

Slippery lubricant-infused surfaces allow easy removal of liquid droplets on surfaces. They consist of textured or porous substrates infiltrated with a chemically compatible lubricant. Capillary forces help to keep the lubricant in place. Slippery surfaces hold promising prospects in applications including drag reduction in pipes or food packages, anticorrosion, anti-biofouling, or anti-icing. However, a critical drawback is that shear forces induced by flow lead to depletion of the lubricant. In this work, a way to overcome the shear-induced lubricant depletion by replenishing the lubricant from the flow of emulsions is presented. The addition of small amounts of positively charged surfactant reduces the charge repulsion between the negatively charged oil droplets contained in the emulsion. Attachment and coalescence of oil droplets from the oil-in-water emulsion at the substrate surface fills the structure with the lubricant. Flow-induced lubrication of textured surfaces can be generalized to a broad range of lubricant–solid combinations using minimal amounts of oil.

Original languageEnglish
Article number1900019
JournalAdvanced science
Volume6
Issue number11
DOIs
Publication statusPublished - 5 Jun 2019

Keywords

  • confocal microscopy
  • emulsions
  • flow
  • porous surfaces
  • wetting

Fingerprint Dive into the research topics of 'Flow-Induced Long-Term Stable Slippery Surfaces'. Together they form a unique fingerprint.

  • Cite this

    Baumli, P., Teisala, H., Bauer, H., Garcia-Gonzalez, D., Damle, V., Geyer, F., ... Vollmer, D. (2019). Flow-Induced Long-Term Stable Slippery Surfaces. Advanced science, 6(11), [1900019]. https://doi.org/10.1002/advs.201900019