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| 1 | Laser pattern-induced unidirectional lubricant flow for lubrication track replenishment显示文摘Effective oil replenishment to the lubrication track of a running bearing is crucial to its sustainable operation.Reliable practical solutions are rare despite numerous theoretical studies were conducted in the last few decades.This paper proposes the use of surface effect,wettability gradient,to achieve the goal.This method is simple and can be nicely implemented using femtosecond laser ablation.A periodic comb-tooth-shaped pattern with anisotropic wetting capability is devised and its effect on the anisotropic spreading behaviour of an oil droplet is studied.Results show that the comb-tooth-shaped pattern enables the rearrangement of oil distribution,thereby escalating oil replenishment to the lubrication track.The effect is due to the unbalanced interfacial force created by the surface pattern.The influence of the shape and the pitch of teeth,which are the two governing factors,on oil transport is also reported.The effects of the newly devised surface pattern on lubrication are experimentally evaluated under the conditions of limited lubricant supply.These results are promising,demonstrating the reduction in bearing friction and the increase in lubricating film thickness. | Chenglong LIU Feng GUO Patrick WONG Xinming LI | 2022 | Friction2022，10，8： | 4 |
| 2 | Preparing a wettability-controllable stainless-steel mesh and its oil-water separation performance显示文摘The ability to regulate and apply surface wettability has attracted much attention in the surface engineering field.In this study,a simple chemical etching method was used to construct a rough micro/nano structure on 304 stainless steel mesh;this rough surface was subsequently decorated with fatty acids of varying chain length to regulate wettability.The wettability,composition,and morphology of the surface were characterized and ana-lyzed by measuring contact angles,and by atomic force microscopy,scanning electron microscopy,and Fourier-transform infrared spectroscopy.The superhydrophobic and superoleophilic properties of the mesh modified with long-chain fatty acids were examined for oil-water separation performance and reusability.The surface had a micro/nano hierarchical morphology with ordered carbon chains,and the hydrophilic-to-superhydrophobic transformation was achieved by adjusting the chain length of the fatty acid to deliver contact angles in the range of 30°~154°.The oil contact angle was always 0°,irrespective of the chain length fatty acid,and oil drops quickly penetrated the mesh surface.A fatty acid with a longer chain afforded a more hydrophobic and oleophilic mesh surface and better oil-water separation efficiency(up to 96%),which still exceeded 85%after 50 cycles of oil-water separation testing.Consequently,the prepared surface with controllable wettability has excellent prospects for use in intelligent response interfaces and oil-water separation applications. | Bohao Qi Wenjing Yi Changsong Liu Xinsheng Zhao Xinming Li | 2022 | ChemPhysMater2022，1，2： | 0 |
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