Interface-Engineered Dendrite-Free Anode and Ultraconductive Cathode for Durable and High-Rate Fiber Zn Dual-Ion Microbattery

Despite the advantages of the fiber-shaped Zn-ion microbattery (FZMB) in powering wearable electronics, several fundamental challenges hinder its practical application, mainly including dendrite growth on Zn anodes (leading to short cycle life) and low electrical conductivity of cathode (resulting in poor rate performance). Herein, a facile approach of sputtering a nano-thin conductive carbon layer on Zn anode to effectively suppress dendrite growth and a dual-conductive polymer strategy to fabricate ultraconductive core-sheath fiber cathode (poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) fiber@polyaniline nanobulges) are demonstrated. The carbon layer suppresses Zn dendrites by uniformizing surface electric field and providing abundant nucleation sites. The superior conductivity of the cathode is inherited from two conductive polymers (in particular, PEDOT:PSS fibers have an ultrahigh conductivity of 3676 S cm⁻¹) and their strong intermolecular interactions. The resulting FZMB shows excellent stability (over 100% capacity retention after 3000 cycles) and supercapacitor-level rate performance (73% capacity retention from 0.1 to 10 A g⁻¹). Kinetics and mechanism studies reveal that the surface-controlled dual-ion migration mechanism is also correlated with the high rate performance. The corresponding quasi-solid-state device exhibits high stability under extreme deformation conditions and superior water-proof capability (94.6% capacity retention after 12 h underwater immersion), demonstrating great practical application potential.     

新型氟碳化学满足生态需求

氟碳树脂是未来纺织品整理领域发展必不可少的部分。生态因素促使它们的化学组成发生改变,从而产生新产品。应用技术人员正面临着挑战。     

桥面防水涂料的性能影响因素研究

介绍了桥梁防水涂料的生产工艺、配方和主要原材料,以及影响涂料性能的主要因素。分析结果表明,橡胶乳液的种类和掺量对涂料的断裂伸长率、低温柔性及不透水性等基本性能有较大的影响;涂料助剂对涂料中沥青的乳化、施工性能和高低温性能都有一定程度的影响。     

浅谈超大体积清水混凝土施工质量控制要点

针对广州大学城中心区体育场钢结构大支墩清水混凝土施工实例,分析了施工过程中的重点与难点,归纳总结了超大体积清水混凝土施工质量控制要点,供类似工程技术人员参考。     

浮动磨削工艺在大型轴类零件加工中的应用

介绍了浮动磨削工艺在M K13100/8000-H数控外圆磨床上的应用,该工艺解决了加工中难以控制的径向跳动问题;另做一个简易的顶具套在尾架顶尖上利用顶具一端圆弧面与滚珠相接触来解决轴向窜动及径向晃动问题,保证了磨削锥度时无轴向窜动。供相关工程技术人员参考。     

EarlyData knowledge base for material decisions in building design

To make use of the great opportunities for emission reduction in early building design, future emissions need to be calculated when only geometric, but no detailed material information about a building is available. Currently, early design phase life cycle assessments (LCAs) are heavily reliant on assumptions of specific material choices, leading to single point emission values which suggest a precision not representative for an early design stage. By adding knowledge about possible locations and functions of materials within a building to life cycle inventory (LCI) data, the EarlyData knowledge base makes LCA data sets accessible and more transparent. Additionally, “generic building parts” are defined, which describe building parts independently of precise material choices as a combination of layers with specific functions. During evaluation, enriched LCI data and generic building parts enable assessment of a vast number of possible material combinations at once. Thus, instead of single value results for a particular material combination, ranges of results are displayed revealing the building parts with the greatest emission reduction potential. The application of the EarlyData tool is illustrated on a use case comparing a wood building and a concrete building. The database is developed with extensibility in mind, to include other criteria, such as (life cycle) costs.     

硬质合金后处理过程中残余应力的研究

综述了硬质合金残余应力的形成机理、分析方法以及后续处理过程中残余应力的研究现状。硬质合金中残余应力的形成是由于受到不均匀的应力场、应变场、温度场的影响;其分析方法主要有X射线衍射法、中子射线衍射法、数值分析法。喷砂(丸)处理使合金表面产生残余压应力,其大小与介质大小、喷射压力、喷射时间等因素有关;电火花加工后的硬质合金表面的WC相中存在残余拉应力,而磨削和抛光后的表面中存在残余压应力;表面处理会导致残余应力的符号、大小和在分布产生复杂的变化。深入研究残余应力的数值模拟方法、探索切削过程中的残余应力演变和开发缓解消除残余拉应力的后处理工艺是今后的研究方向。     

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Influence of finish rolling temperature on the metallographic structure, mechanical properties and precipitation behavior of the second phase particles was studied by means of optical microscopy, scanning electron microscopy, transmission electron microscopy and other test equipments. The results show that the metallographic structures of high strength steels for container with different finish rolling temperatures are composed of ferrite and a little pearlite and the grain size grades of ferrite are both 13.0. Compared with the one with finish rolling temperature of 890 ??, the yield strength and tensile strength of the one with finish rolling temperature of 850 ?? increase by 32 MPa and 26 MPa respectively. The results of theoretical calculation and observation by TEM show that the higher strength of the one with finish rolling temperature of 850 ?? mainly is due to the higher nucleation rate of second phase particles, more precipitation amount and smaller particle spacing, which makes precipitation strengthening effect more significant.     

化学镀电磁辐射防护织物表面电阻的形成机理和影响因素的探讨

本文探讨了用化学镀方法生产的电磁辐射防护织物表面电阻的形成机理和影响因素 ,推导了其表面电阻的计算公式 ,提出了降低其表面电阻的方法。     

为非织造布提供防水性和阻燃性的创新方案

非织造布用不同的聚合物乳液整理可以获得相应的特殊性能。本文介绍了几种赋予非织造布防水性、耐溶剂性和阻燃性的聚合物乳液。