Delayed Lubricant Depletion of Slippery Liquid Infused Porous Surfaces Using Precision Nanostructures
- Title
- Delayed Lubricant Depletion of Slippery Liquid Infused Porous Surfaces Using Precision Nanostructures
- Author
- 오준호
- Issue Date
- 2021-07
- Publisher
- AMER CHEMICAL SOC
- Citation
- LANGMUIR, v. 37, NO 33, Page. 10071-10078
- Abstract
- Slippery liquid infused porous surfaces (SLIPS) are an
important class of repellent materials, comprising micro/nanotextures infused
with a lubricating liquid. Unlike superhydrophobic surfaces, SLIPS do not
rely on a stable air−liquid interface and thus can better manage low surface
tension fluids, are less susceptible to damage under physical stress, and are
able to self-heal. However, these collective properties are only efficient as long
as the lubricant remains infused, which has proved challenging. We
hypothesized that, in comparison to a nanohole and nanopillar morphology,
the “hybrid” morphology of a hole within a nanopillar, namely a nanotube,
would be able to retain and redistribute lubricant more effectively, owing to
capillary forces trapping a reservoir of lubricant within the tube, while
lubricant between tubes can facilitate redistribution to depleted areas. By
virtue of recent fabrication advances in spacer defined intrinsic multiple
patterning (SDIMP), we fabricated an array of silicon nanotubes and equivalent arrays of nanoholes and nanopillars (pitch, 560 nm;
height, 2 μm). After infusing the nanostructures (prerendered hydrophobic) with lubricant Krytox 1525, we probed the lubricant
stability under dynamic conditions and correlated the degree of the lubricant film discontinuity to changes in the contact angle
hysteresis. As a proof of concept, the durability test, which involved consecutive deposition of droplets onto the surface amounting to
0.5 L, revealed 2-fold and 1.5-fold enhancements of lubricant retention in nanotubes in comparison to nanopillars and nanoholes,
respectively, showing a clear trajectory for prolonging the lifetime of a slippery surface.
- URI
- https://pubs.acs.org/doi/10.1021/acs.langmuir.1c01310https://repository.hanyang.ac.kr/handle/20.500.11754/172513
- ISSN
- 07437463
- DOI
- 10.1021/acs.langmuir.1c01310
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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