Designing non-textured, all-solid, slippery hydrophilic surfaces

Hamed Vahabi, Sravanthi Vallabhuneni, Mohammadhasan Hedayati, Wei Wang, Diego Krapf, Matt J. Kipper, Nenad Miljkovic, Arun K. Kota

Research output: Contribution to journalArticlepeer-review

Abstract

Slippery surfaces are sought after because of their wide range of applications in self-cleaning, drag reduction, fouling resistance, enhanced condensation, biomedical implants, etc. Recently, non-textured, all-solid, slippery surfaces have gained significant attention because of their advantages over super-repellent surfaces and lubricant-infused surfaces. Currently, almost all non-textured, all-solid, slippery surfaces are hydrophobic. In this work, we elucidate the systematic design of non-textured, all-solid, slippery hydrophilic (SLIC) surfaces by covalently grafting polyethylene glycol brushes to smooth substrates. Furthermore, we postulate a plateau in slipperiness above a critical grafting density, which occurs when the tethered brush size is equal to the inter-tether distance. Our SLIC surfaces demonstrate exceptional performance in condensation and fouling resistance compared with non-slippery hydrophilic surfaces and slippery hydrophobic surfaces. Based on these results, SLIC surfaces constitute an emerging class of surfaces with the potential to benefit multiple technological landscapes ranging from thermofluidics to biofluidics.

Original languageEnglish (US)
Pages (from-to)4502-4512
Number of pages11
JournalMatter
Volume5
Issue number12
DOIs
StatePublished - Dec 7 2022
Externally publishedYes

Keywords

  • MAP3: Understanding
  • dropwise condensation
  • fouling resistance
  • grafting density
  • hydrophilic
  • slippery

ASJC Scopus subject areas

  • General Materials Science

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