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| 1 | Fibers reinforced composite hydrogels with improved lubrication and load-bearing capacity显示文摘Hydrogels as one kind of soft materials with a typical three-dimensional(3D)hydrophilic network have been getting great attention in the field of biolubrication.However,traditional hydrogels commonly show poor tribology performance under high-load conditions because of their poor mechanical strength and toughness.Herein,pure chemical-crosslinking hydrogels mixed with different types of the micron-scale fibers can meet the requirements of strength and toughness for biolubrication materials,meanwhile the corresponding tribology performance improves significantly.In a typical case,three kinds of reinforcement matrix including needle-punched fibers,alginate fibers,and cottons are separately combined with Poly(n-vinyl pyrrolidone)-poly 2-hydroxyethyl methacrylate(PVP-PHEMA)hydrogels to prepare fibers reinforced composite hydrogels.The experimental results show that the mechanical properties of fibers reinforced composite hydrogels improve greatly comparable with pure PVP-PHEMA hydrogels.Among three kinds of fibers reinforced composite hydrogel,the as-prepared composite hydrogels reinforced with needle-punched fibers possess the best strength,modulus,and anti-tearing properties.Friction tests indicate that the fibers reinforced composite hydrogels demonstrate stable water-lubrication performance comparable with pure PVP-PHEMA hydrogels.Besides,the hydrogel-spunlace fiber samples show the best load-bearing and anti-wear capacities.The improved tribology performance of the composite hydrogels is highly related to mechanical property and the interaction between the fibers and hydrogel network.Finally,spunlace fibers reinforced hydrogel materials with high load-bearing and low friction properties are expected to be used as novel biomimetic lubrication materials. | Jiawei LI Luyao GAO Rongnian XU Shuanhong MA Zhengfeng MA Yanhua LIU Yang WU Libang FENG Meirong CAI Feng ZHOU | 2022 | Friction2022，10，1： | 1 |
| 2 | Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials显示文摘Metamaterials composed of metallic antennae arrays are used as they possess extraordinary optical transmission(EOT)in the terahertz(THz)region,whereby a giant forward light propagation can be created using constructive interference of tunneling surface plasmonic waves.However,numerous applications of THz meta-devices demand an active manipula-tion of the THz beam in free space.Although some studies have been carried out to control the EOT for the THz region,few of these are based upon electrical modulation of the EOT phenomenon,and novel strategies are required for act-ively and dynamically reconfigurable EOT meta-devices.In this work,we experimentally present that the EOT resonance can be coupled to optically reconfigurable chalcogenide metamaterials which offers a reversible all-optical control of the THz light.A modulation efficiency of 88%in transmission at 0.85 THz is experimentally observed using the EOT metama-terials,which is composed of a gold(Au)circular aperture array sitting on a non-volatile chalcogenide phase change ma-terial(Ge2Sb2Te5)film.This comes up with a robust and ultrafast reconfigurable EOT over 20 times of switching,excited by a nanosecond pulsed laser.The measured data have a good agreement with finite-element-method numerical simula-tion.This work promises THz modulators with significant on/off ratios and fast speeds. | Tun Cao Meng Lian Xieyu Chen Libang Mao Kuan Liu Jingyuan Jia Ying Su Haonan Ren Shoujun Zhang Yihan Xu Jiajia Chen Zhen Tian Dongming Guo | 2022 | Opto-Electronic Science2022，1，1： | 1 |
| 3 | Advances in Electrocatalytic Semi-Hydrogenation of Acetylene in Aqueous Electrolyte: Progress, Challenges, and Opportunities显示文摘Catalytic hydrogenation is a foundational pillar of the chemical industry.Especially,semi-hydrogenation of acetylene(C_(2)H_(2))to ethylene(C_(2)H_(4))is an important industrial reaction to generate polymer-grade C_(2)H_(4) from crude streams for polyethylene production.The industrial C_(2)H_(2) semi-hydrogenation process is currently dominated by the thermocatalytic route that involves cost-prohibitive Pdbased catalysts,high operation temperature,and excess hydrogen feed.Thermocatalytic semi-hydrogenation of C_(2)H_(2) is also hindered by limited C_(2)H_(4) selectivity due to unwanted over-hydrogenation.Therefore,seeking strategies to improve the catalyst performance while reducing energy consumption and capital expenditure of the current hydrogenation schemes is essential to the petrochemical industry.Fortunately,recent advances in electrocatalytic C_(2)H_(2) semi-hydrogenation systems lead to a sustainable alternative to traditional thermocatalytic systems.Using renewable electricity as an energy source and water as a hydrogen source,electrocatalytic systems can operate under ambient conditions with tunable selectivity toward C_(2)H_(4).In this review,we first discuss the reactor design for electrocatalytic C_(2)H_(2) semi-hydrogenation.We then review the computational studies for understanding and predicting the catalytic behavior ofmetal catalysts.We also summarize advanced electrocatalysts categorized into Cu-based and non-Cu-based materials.Finally,we provide perspectives on the opportunities to overcome existing challenges for future practical application of electrocatalytic C_(2)H_(2) semihydrogenation. | Zihao Yan Libang Xu Huiyuan Zhu | 2023 | Renewables2023，1，3： | 0 |
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