How Slippery are SLIPS? Measuring Effective Slip on Lubricated Surfaces with Colloidal Probe Atmoc Force Microscopy
- Liam R. J. ScarrattLiam R. J. ScarrattSchool of Chemistry and the University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, AustraliaMore by Liam R. J. Scarratt
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- Liwen ZhuLiwen ZhuSchool of Chemistry and the University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, AustraliaMore by Liwen Zhu
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- Chiara Neto*Chiara Neto*E-mail: [email protected]School of Chemistry and the University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, AustraliaMore by Chiara Neto
Abstract

Lubricant-infused surfaces have attracted great attention recently and are described as slippery liquid-infused porous surfaces (SLIPS). Here, we measured the hydrodynamic drainage forces on SLIPS by colloid probe atomic force microscopy (AFM) and quantified the effective slip length over a nanothin silicone oil layer on hydrophobized [octadecyltrichlorosilane (OTS)-coated] silicon wafers. The thickness of a stable silicone oil film on OTS–Si under sucrose solution was determined to be 1.8 ± 1.3 nm and was found to induce an average effective slip length of 29 ± 3 nm, very close to that of an uninfused OTS substrate. These relatively low values of effective slip are confirmed by the relatively large macroscopic roll-off angle values of water droplets on the same substrates. Both nano- and macroscale results reflect the immobilized nature of a silicone oil layer of thickness around 2 nm within an underlying monolayer. These results have important implications in the design of drag-reducing coatings using lubricant infusion.
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