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How Slippery are SLIPS? Measuring Effective Slip on Lubricated Surfaces with Colloidal Probe Atmoc Force Microscopy

Cite this: Langmuir 2019, 35, 8, 2976–2982
Publication Date (Web):February 5, 2019
Copyright © 2019 American Chemical Society

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    Abstract Image

    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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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.langmuir.8b03767.

    • Additional statistical details regarding hydrodynamic force experiments, tapping mode atomic force micrographs of clean and OTS-coated silicon wafers, optical micrographs of OTS-coated silicon wafers infused with different thicknesses of silicon oil submerged in water, Hamaker constants and spreading parameters for a silicone oil layer on different substrates in air, water, and sucrose solution, advancing and receding CAs for values presented in Table 1, pointed tip AFM approach and withdraw force curves on OTS silicon wafers in air and water with different silicone oil layer thicknesses, and linearized hydrodynamic approach force curve using colloid probe AFM in sucrose solution compared to standard data representation at separation distance <300 nm (PDF)

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    Cited By

    This article is cited by 28 publications.

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    19. A. A. Ganne. On the Issue of the Stability of Water-Repellent Infusion Liquids on Hydrophilic and Hydrophobic Silica Substrates. Colloid Journal 2022, 84 (4) , 411-415.
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