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Bubble transfer on wettability-heterogeneous surfaces

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Chinese Chemical Letters 2023年第7期34卷 472-476页

作者： Chunhui Zhang Xiao Xiao Ziwei Guo Lei Jiang cunming yu CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Researches have investigated the formation, transportation and spreading of bubble on solid surface with specific wettability. However, bubble transfer on wettability-heterogeneous surfaces has been rarely reported, which also plays significant role in water electrolysis, heat transfer, micro-bubble collection, *** this work, we carefully investigate the behavior of bubble transfer from the aerophobic or aerophilic region to the superaerophilic region through fabricating the wettability-heterogenous surfaces. Surface energy was elucidated to be transformed to the kinetic energy during bubble transfer process. Theoretical analysis on the average velocity of bubble transfer was consistent with the experimental *** influence of wettability of solid substrate, bubble volume and superaerophilic stripe width on bubble transfer are carefully investigated. Moreover, wettability-heterogeneous surfaces were explored to be applied in micro-CO_(2) bubble collection and H_(2) bubble removement in water splitting.

关键词： Bubble transfer Superaerophilicity Wettability-heterogenous Surface energy Bubble collection Water splitting

Amphiphilic Pd@micro-organohydrogels with controlled wettability for enhancing gas-liquid-solid triphasic catalytic performance

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Nano Research 2022年第1期15卷 557-563页

作者： Minghui Zhang Tianyi Zhao cunming yu Qian Liu Guangyan Wang Hui Yang Ming Yang Lei Jiang Mingjie Liu Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China CAS Key Lab of Colloid Interface and Chemical Thermodynamics Institute of ChemistryChinese Academy of SciencesBeijing 100190China

The wettability of catalyst plays an important role in regulating catalytic performance in heterogenous catalysis because the microenvironment around the catalytic sites directly determines the mass transfer process of *** by gas trapped on the surface of subaquatic spiders,amphiphilic micro-organohydrogels with tunable surface wettabilities were developed by anchoring various alkane chains onto a poly(2-(dimethylamino)ethyl methacrylate)(p(DMAEMA))hydrophilic microgel *** nanoparticles(Pd NPs)were encapsulated in amphiphilic microgels(amphiphilic Pd@M)to catalyze hydrogenation reaction,achieving higher activities than pristine monohydrophilic Pd@M *** underwater oleophilicity and aerophilicity of Pd@M composites were quantified by oil/gas adhesion measurements and computational *** higher amphiphilic catalytic activities are attributed to the formation of a gas-oil-solid reaction interface on the catalyst surfaces,allowing rapid transport of H2 and organic substrates through water to the Pd catalytic ***,amphiphilic Pd@M composites also exhibit more superior catalytic performance in multi-substrates reaction.

关键词： tunable surface wettability bioinspired materials gel amphiphilic microgel heterogeneous catalysis three-phase catalysis

Smart Manipulation of Gas Bubbles in Harsh Environments Via a Fluorinert-Infused Shape-Gradient Slippery Surface

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Transactions of Tianjin University 2020年第6期26卷 441-449页

作者： Guoliang Liu Chunhui Zhang Mengfei Liu Ziwei Guo Xinsheng Wang cunming yu Moyuan Cao Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China Laboratory of Bio-inspired Materials and Interface Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300354China

Fundamental research and practical applications have examined the manipulation of gas bubbles on open surfaces in lowsurface-tension,high-pressure,and high-acidity,-alkalinity,or-salinity ***,to the best of our knowledge,effi cient and general approaches to achieve the smart manipulation of gas bubbles in these harsh environments are ***,a Fluorinert-infused shape-gradient slippery surface(FSSS)that could eff ectively regulate the behavior of gas bubbles in harsh environments was successfully *** unique capability of FSSS was mainly attributed to the properties of Fluorinert,which include chemical inertness and *** shape-gradient morphology of FSSS could induce asymmetric driving forces to move gas bubbles directionally on open *** infl uencing gas bubble transport on FSSS,such as the apex angle of the slippery surface and the surface tension of the aqueous environment,were carefully investigated,and large apex angles were found to result in large initial transport velocities and short transport *** the surface tension of the aqueous environment is unfavorable to bubble ***,FSSS could transport gas bubbles in aqueous environments with surface tensions as low as 28.5±0.1 mN/m,which is lower than that of many organic solvents(e.g.,formamide,ethylene glycol,and dimethylformamide).In addition,FSSS could also realize the facile manipulation of gas bubbles in various aqueous environments,e.g.,high pressure(~6.8 atm),high acidity(1 mol/L H 2 SO 4),high alkalinity(1 mol/L NaOH),and high salinity(1 mol/L NaCl).The current fi ndings provide a source of knowledge and inspiration for studies on bubble-related interfacial phenomena and contribute to scientifi c and technological developments for controllable bubble manipulation in harsh environments.

关键词： Slippery surface Shape-gradient Asymmetric driving force Smart bubble transport Harsh environment

Pt-Pd-Rh三元针织经向铂催化网在稀硝酸生产中的应用

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化学工业与工程技术 2006年第6期27卷 57-58页

作者：余存明南化公司硝酸部江苏南京210048

介绍了Pt-Pd-Rh三元针织经向铂催化网在稀硝酸生产装置中的使用情况及巩固措施。

关键词：铂网催化剂氨氧化率稀硝酸针织经向消耗

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螺杆压缩机在浓硝酸装置尾气治理中的应用

化肥工业 2011年第6期38卷 47-49页

作者：彭春生余存明中石化南京化学工业有限公司硝酸部 210035

浓硝酸装置加浓塔、塔尾罐、镁尾罐、浓硝酸中间槽排放出的含NOx尾气在生产过程中进行高点排放,不仅污染环境,而且造成部分NOx的损耗。通过对3套浓硝酸装置尾气治理进行工艺改造、操作调优,特别是应用LG-20/4.5型螺杆压缩机后,回收了各... 详细信息

浓硝酸装置加浓塔、塔尾罐、镁尾罐、浓硝酸中间槽排放出的含NOx尾气在生产过程中进行高点排放,不仅污染环境,而且造成部分NOx的损耗。通过对3套浓硝酸装置尾气治理进行工艺改造、操作调优,特别是应用LG-20/4.5型螺杆压缩机后,回收了各罐体中闪蒸的NOx气体,取得了较好的环保效果。

关键词：螺杆压缩机 NOx尾气改造应用

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仿生减阻表面的进展与挑战

北京航空航天大学学报 2022年第9期48卷 1782-1790页

作者：刘明杰吴青山严昊于存明蔺存国张金伟赵天艺北京航空航天大学化学学院北京100083 中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室青岛266237

减阻表面由于其在海洋船舶、管道运输、飞机和国防军事等各个领域展现出的巨大潜力和广泛的应用前景而受到越来越多的关注。自然界中的动植物进化出了许多独特的形态或表面结构,均展现出了卓越的减阻性能。对近年来受海豚表面启发的顺... 详细信息

减阻表面由于其在海洋船舶、管道运输、飞机和国防军事等各个领域展现出的巨大潜力和广泛的应用前景而受到越来越多的关注。自然界中的动植物进化出了许多独特的形态或表面结构,均展现出了卓越的减阻性能。对近年来受海豚表面启发的顺服表面减阻、鲨鱼皮表面启发的微结构减阻及受荷叶表面启发的超疏水减阻等进行了总结,并介绍了这些技术的研究进展、减阻机理和挑战,对目前仿生减阻表面的研究进行了总结与展望。

关键词：仿生减阻顺服表面微结构超疏水

Engineering electrode wettability to enhance mass transfer in hydrogen evolution reaction

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Nano Research Energy 2023年第2期2卷 203-206页

作者： Chunhui Zhang Ziwei Guo Ye Tian cunming yu Kesong Liu Lei Jiang School of Chemistry Beihang UniversityBeijing 100191China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

In hydrogen evolution reaction,inefficient mass transfer caused by bubble adhesion on electrode,bubble dispersion in electrolyte and slow H2 diffusion,has greatly impeded the reaction *** techniques can only resolve bubble adhesion or bubble dispersion *** that simultaneously solve bubble adhesion,bubble dispersion and poor hydrogen diffusion problems is rarely ***,an article reported a new electrode with special wettability design,which can efficiently promote bubble transfer and dissolved H2 *** design can simultaneously solve above mentioned three mass transfer issues and improve electrode *** summarize the remaining challenges of this work and outlook potential approaches to promote mass transfer in gas-evolution reactions.

关键词： hydrogen evolution reaction wettability bubble mass transfer

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长征六号丙运载火箭特点及技术创新

上海航天（中英文） 2024年第5期41卷 24-34页

作者：丁秀峰余延生陈中强王文彬胡存明上海航天技术研究院上海201109 上海宇航系统工程研究所上海201109 上海航天控制技术研究所上海201109

长征六号丙(LM-6C)运载火箭是长征六号改系列型谱中单芯级两级全液氧煤油火箭,满足太阳同步轨道2 t级运载能力区间发射需求。作为后续新一代长征系列运载火箭的主力构型之一,长征六号丙运载火箭在缩短研制周期,提高飞行可靠性和任务适应... 详细信息

长征六号丙(LM-6C)运载火箭是长征六号改系列型谱中单芯级两级全液氧煤油火箭,满足太阳同步轨道2 t级运载能力区间发射需求。作为后续新一代长征系列运载火箭的主力构型之一,长征六号丙运载火箭在缩短研制周期,提高飞行可靠性和任务适应性,简化发射场操作,提升火箭性价比和履约能力等方面,进行了技术及研制流程的创新,突破了以两级无尾翼火箭总体构型优化、2.9 m直径大温差泡沫夹层共底、任务适应性强的高可靠数字增压技术、自适应增广控制等为代表的多项关键技术。本文对长征六号丙运载火箭的研制背景及历程、特点及技术创新等进行了综述,并提出了后续发展方向。

关键词：长征六号丙(LM-6C) 运载火箭特点技术创新后续发展

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桥梁断面气动导纳的数值识别方法研究

空气动力学学报 2015年第5期33卷 706-713页

作者：唐煜郑史雄张龙奇马存明谷红强西南交通大学风工程研究中心四川成都610031

针对一种气动导纳的数值识别方法进行研究。基于二维不可压缩URANS方法,选用SSTk-ω湍流模型,通过在来流中给定单一频率的竖向谐波速度分量,计算相应的桥梁断面气动力荷载时程,识别桥梁断面的气动导纳。首先考查来流脉动特性在计算域内... 详细信息

针对一种气动导纳的数值识别方法进行研究。基于二维不可压缩URANS方法,选用SSTk-ω湍流模型,通过在来流中给定单一频率的竖向谐波速度分量,计算相应的桥梁断面气动力荷载时程,识别桥梁断面的气动导纳。首先考查来流脉动特性在计算域内的自保持能力,随后再对平板和桥梁断面的气动导纳进行识别,所得结果与理论解和试验值相比较,并讨论流场初始化条件的影响。结果表明:足够小的网格尺寸和时间步长是来流脉动不发生明显衰减的必要条件;平板的气动导纳识别结果与Sears函数高度吻合;数值识别的桥梁断面升力气动导纳在低频段与Sears函数一致,在高频段略低,但与试验值较接近;力矩气动导纳与Sears函数有较大差异,但与试验值基本吻合;流场初始化条件对计算效率有影响。

关键词：桥梁断面气动导纳数值方法 URANS 来流自保持流场初始化条件