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Interfacial Effects of Superhydrophobic Plant Surfaces： A Review

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Journal of Bionic Engineering 2014年第3期11卷 325-345页

作者： Guiyuan Wang Zhiguang Guo weimin liu Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials and Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials Hubei University Wuhan 430062 P. R. China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Lanzhou 730000 P. R. China

Nature is a huge gallery of art involving nearly perfect structures and properties over the millions of years of development. Many plants and animals show water-repellent properties with fine micro-structures, such as lotus leaf, water skipper and wings of butterfly. Inspired by these special surfaces, the artificial superhydrophobic surfaces have attracted wide attention in both basic research and industrial applications. The wetting properties of superhydrophobic surfaces in nature are affected by the chemical compositions and the surface topographies. So it is possible to realize the biomimetic superhydrophobic surfaces by tuning their surface roughness and surface free energy correspondingly. This review briefly introduces the physical-chemical basis of superhydrophobic plant surfaces in nature to explain how the superhydrophobicity of plant surfaces can be applied to different biomimetic functional materials with relevance to technological applications. Then, three classical effects of natural surfaces are classified： lotus effect, salvinia effect, and petal effect, and the promising strategies to fabricate biomimetic su- perhydrophobic materials are highlighted. Finally, the prospects and challenges of this area in the future are proposed.

关键词： interfacial effects superhydrophobicity plant leaves contact angle bionics

Underoil superhydrophilic flame-retardant 3D porous composite for efficient on-demand emulsion separation:Interface engineering design on sphagnum moss

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Friction 2024年第10期12卷 2222-2240页

作者： Yuyan GUO Peng liu Wenhao ZHANG Zhiguang GUO weimin liu Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan 430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China

Oil pollution and the energy crisis make oil-water separation an urgent for human *** widespread use of materials with a single emulsion separation capability is *** on-demand separation materials can adapt to a wide range of application scenarios,thus having a wider range of *** underoil superhydrophilic surface is of great significance for realizing the on-demand separation of oil/water emulsions through the removal of water in the oil and oil in the water.A 3D porous emulsion separation material based on the superhydrophilic principle of sphagnum moss was *** material was prepared in a simple step by taking advantage of the adhesion of polydopamine and the introduction of the as-prepared superhydrophilic BaSO4 nanoparticles to achieve superhydrophilicity with a water contact angle(WCA)of 0°and an oil contact angle(OCA)of 157.3°,resulting in excellent separation performance for both water-in-oil and oil-in-water *** superhydrophilic porous composite(OSPC)can complete two kinds of emulsion separations by filtration or *** adsorbs water from water-in-oil emulsion to achieve separation,with a good adsorption capacity of 74.38 g/g and efficiency up to 99%.It can also filter oil-in-water emulsions with an efficiency of 99.92%.The separation efficiencies are all almost unchanged after ten separation ***,the material has excellent flame retardancy,which reduces the possibility of secondary *** three-dimensional porous sponge has excellent on-demand separation performance for multiple *** provides a new preparation strategy for underoil superhydrophilic materials and a new idea for the design direction of special wetting materials for the on-demand separation of oil/water emulsions.

关键词： on-demand emulsion separation porous absorption filtration underoil hydrophilicity superwettability

Screening of low-friction two-dimensional materials from highthroughput calculations using lubricating figure of merit

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Friction 2024年第8期12卷 1897-1908页

作者： Kewei TANG Weihong QI Guoliang RU weimin liu State Key Laboratory of Solidification Processing and Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Two-dimensional materials are excellent lubricants with inherent ***,superlubricity has been reported for only a few of these ***,other promising two-dimentional(2D)materials with different physical properties cannot be discovered or applied in production;thus,energy consumption can be greatly ***,we carry out high-throughput calculations for 1,4752D materials and screen for low-friction *** set a standard,we propose,for the first time,a geometry-independent lubricating figure of merit based on the conditions for stick-slip transition and our theory of Moiré*** the efficient calculation of this figure of merit,an innovative approach was developed based on an improved registry index *** calculations,340 materials were found to have a figure of merit lower than 10−***,a small set of 21 materials with a figure of merit lower than 10−4 were screened *** materials can provide diverse choices for various *** addition,the efficient computational approach demonstrated in this work can be used to study other stacking-dependent properties.

关键词： two-dimensional materials high-throughput calculation tribology low-friction materials Moirépatterns

Nature-inspired Polysaccharide-based Aerogel for Oil–water Separation

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Journal of Bionic Engineering 2023年第5期20卷 1956-1966页

作者： Ye Fu Shulun Ai Zhiguang Guo weimin liu Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China

Oily wastewater pollution is an urgent problem to be *** preparation process,toxic hydrophobic modifiers and poor mechanical properties limit the application of polysaccharide-based aerogel in oil–water *** by the Strider’s Leg structure in nature,an eco-friendly and reusable polysaccharide-based composite aerogel was prepared by hydrophobic modification with zein for efficient oil–water *** introduction of hydrophobic zein into aerogel by simple immersion method without the use of toxic modifiers can build micro/nanostructures similar to the villi on a water strider’s leg to increase the surface roughness and the *** three degradable,non-toxic and economical polysaccharides including chitosan,carboxylated cellulose nanofibers and starch were used to construct aerogel skeleton,endowing aerogel with porous structures and good mechanical *** resulting composite aerogel(ZOMA)showed low density(0.11 g/cm^(3)),good oil absorption capacity(9 g/g),high flux oil–water separation(5595 L m^(−2)h^(−1))and excellent oil–water separation performance(99.8%).And ZOMA still had good tensile strength and elasticity after 50 compression *** 10 cycles of absorption and desorption,ZOMA aerogel remained still more than 90%of its initial absorption *** study provides new insight for the design of environmentally friendly and efficient adsorbents for oil–water separation.

关键词： Polysaccharide based aerogel Zein Hydrophobic modification Oil-water separation

Low friction of superslippery and superlubricity:A review

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Friction 2023年第7期11卷 1121-1137页

作者： Zijian ZHENG Zhiguang GUO weimin liu Jianbin LUO Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan 430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

The issues regarding energy dissipation and component damage caused by the interface friction between a friction pair attract enormous attention to friction *** key-enabling technique to realize friction reduction is the use of *** lubricants smooth the contact interfaces,achieving an ultralow friction contact,which is called superslippery or *** present,superslippery and superlubricity are two isolated research *** is a lack of unified definition on superslippery and superlubricity from the viewpoint of ***,this review aims at exploring the differences and relations between superslippery and superlubricity from their origin and application ***,the challenges for developing superslippery surface and superlubricity surface are *** addition,perspectives on the interactive development of these two surfaces are *** hope that our discussion can provide guidance for designing superslippery or superlubricity surfaces by using varies drag-reduction technologies.

关键词： low friction superslippery superlubricity tribology lubricants

Lubricant self-replenishing slippery surface with prolonged service life for fog harvesting

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Friction 2022年第10期10卷 1676-1692页

作者： Yi CHEN weimin liu Jinxia HUANG Zhiguang GUO State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan 430062China

Slippery lubricant-infused surfaces exhibit excellent fog-harvesting capacities compared with superhydrophobic and superhydrophilic ***,lubricant depletion is typically unavoidable under dynamic conditions,and reinfused oil is generally needed to recover the fog-harvesting ***,an effective strategy for delaying the depletion of lubricant to prolong the service life of fog harvesting is *** ultrathin transparent lubricant self-replenishing slippery surface was fabricated via facile one-step solvent evaporation *** gel film of the lubricant self-replenishing slippery surface,which was embedded with oil microdroplets,was attached to glass slides via the phase separation and evaporation of *** gel film GFs-150(with oil content 150 wt%of aminopropyl-terminated polydimethyl siloxane(PDMS–NH2))exhibited superior slippery and fog-harvesting performance to other gel ***,the slippery surfaces with the trait of oil secretion triggered by mechanical stress exhibited better fog-harvesting capabilities and longer service life than surfaces without the function of lubricant *** lubricant self-replenishing,ultrathin,and transparent slippery surfaces reported herein have considerable potential for applications involving narrow spaces,visualization,long service life,etc.

关键词： prolonged service life lubricant self-replenishing slippery liquid-infused surfaces fog harvesting

Combustion synthesis of bulk nanocrystalline iron alloys

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Progress in Natural Science:Materials International 2016年第1期26卷 13-23页

作者： Licai Fu Jun Yang weimin liu College of Materials Science and Engineering Hunan University State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences

The controlled synthesis of large-scale nanocrystalline metals and alloys with predefined architecture is in general a big challenge, and making full use of these materials in applications still requires greatly effort. The combustion synthesis technique has been successfully extended to prepare large-scale nanocrystalline metals and alloys, especially iron alloy, such as Fe C, Fe Ni, Fe Cu, Fe Si, Fe B, Fe Al, Fe Si Al, Fe Si B, and the microstructure can be designed. In this issue, recent progress on the synthesis of nanocrystalline metals and alloys prepared by combustion synthesis technique are reviewed. Then, the mechanical and tribological properties of these materials with microstructure control are discussed.

关键词： Combustion synthesis Nanocrystalline Mechanical behavior Tribological properties

Computational investigation of the lubrication behaviors of dioxides and disulfides of molybdenum and tungsten in vacuum

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Friction 2017年第1期5卷 23-31页

作者： Jingyan NIAN Liwei CHEN weimin liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei University Wuhan 430062 China

Lamellar compounds such as the disulfides of molybdenum and tungsten are widely used as additives in lubricant oils or as solid lubricants in aerospace *** dioxides of these two transition metals have identical microstructures with those of the *** differences in the lubrication behaviors of disulfide and dioxides were investigated *** dioxide and molybdenum dioxide exhibit higher bond strengths at the interface and lower interlayer interactions than those of the disulfides which indicates their ***,the topography of the electron density of the single layer nanostructure determined their sliding potential barrier;the dioxides showed a weaker electronic cloud distribution between the two neighboring oxygen atoms,which facilitated the oxygen atoms of the counterpart to go *** commensurate friction,the dioxides exhibited nearly the same value of friction work,and same was the case for the *** lower positive value of friction work for the dioxides confirmed their improved lubricity than the disulfides and the higher mechanical strength of the bulk dioxides demonstrated that they are excellent solid lubricants in vacuum.

关键词： solid lubricant superlubricity first-principles molecular dynamics disulfides dioxides

Bioinspired Edible Lubricant-Infused Surface with Liquid Residue Reduction Properties

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Research 2019年第1期2019卷 474-485页

作者： Daheng Wang Zhiguang Guo weimin liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouChina Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhanChina University of Chinese Academy of Sciences Beijing 100049China

Inspired by nature’s water-repellent plants,the superhydrophobic surface(SHS)and the lubricant-infused surface(LIS)possess potentials in various fields of *** particular,the edible SHS and the edible LIS(ELIS)are suitable for the role of highvalued liquid food residue *** this study,the ELIS was introduced through a facile spray method and direct lubricant *** types of ELISs were fabricated:carnauba wax with ethyl oleate infusion,carnauba wax with cooking oil infusion,beeswax with ethyl oleate infusion,and beeswax with cooking oil *** carnauba wax-coated ELIS has better slipperiness,while the beeswax-coated ELIS has better *** ethyl oleate-infused ELIS possesses ELIS to SHS transformable ability,and the cooking oil-infused ELIS also possesses better slipperiness and has the affordable ***,the material selection of ELIS is accessible,renewable,green,recyclable,and *** results illustrated that ELIS has advantages of long-term effectiveness and impact resistance over edible SHS and indicated that the ELIS can be facilitated for the manufacture of a multifunctional liquid residue reduction surface with food safety assurance.

关键词： residue valued transparency