EFFECT OF MICRO-STRUCTURAL GEOMETRY ON LUBRICANT INFILTRATION AND PROPERTY OF SLIPPERY LIQUID-INFUSED POROUS SURFACES

Mantana Suwan, Nuchjarin Sangwong, Nithi Atthi, Pattaraluck Pattamang, Witsaroot Sripumkhai and Sitthisuntorn Supothina
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Mantana Suwan: National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
Nuchjarin Sangwong: National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
Nithi Atthi: ��Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand
Pattaraluck Pattamang: ��Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand
Witsaroot Sripumkhai: ��Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand
Sitthisuntorn Supothina: National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand

Surface Review and Letters (SRL), 2022, vol. 29, issue 02, 1-12

Abstract: Liquid-infused porous surfaces inspired by Nepenthes pitcher plant were fabricated on polyurethane. Five different micro-structures, including pillar (PIL), Sharklet® (SHK), continuous discrete ridge (DIR), hole (HOL) and networking (NET), were fabricated by soft lithography. Effects of micro-structural geometry on lubricant infiltration capability were investigated by infiltration the micro-structures with two lubricants of different viscosity, Krytox-103 (η: 0.131 Pa⋅s) and Krytox-105 (η:0.737Pa⋅s). The lubricant infiltration and retention capability were determined using a confocal laser scanning micro-scopy, and properties of the infused surfaces were evaluated by measuring the speed of water droplet motion at various tilting angles. The results revealed that, for the 80μm-high micro-structures, infiltration with a less viscous Krytox-103 resulted in more complete infiltration and retention, particularly for the PIL micro-structure. The infused surface exhibited a slippery behavior signified by low sliding angle and good anti-adhesion against chlorophyll fluid and milk yogurt. The lubricant retention capability was significantly reduced for the 7μm-high micro-structures due to lower aspect ratio and low capillary force. In this case, the PIL infused with a more viscous Krytox-105 provided a slippery surface.

Keywords: Slippery surface; SLIPS; biomimetic; Nepenthes; liquid-repellent; polyurethane (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22500196

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