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Mechanical reliable,NIR light-induced rapid self-healing hydrogel electrolyte towards flexible zinc-ion hybrid supercapacitors with low-temperature adaptability and long service life

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Journal of Energy Chemistry 2024年第5期92卷 63-73页

作者： Tengjia Gao Na Li Yang Yang Jing Li Peng Ji yunlong zhou Jianxiong Xu School of Materials and Advanced Manufacturing Hunan Key Laboratory of Electrochemical Green Metallurgy TechnologyHunan University of TechnologyZhuzhou 412007HunanChina School of Life Sciences and Chemistry Hunan Key Laboratory of Biomedical Nanomaterials and DevicesHunan University of TechnologyZhuzhou 412007HunanChina

Hydrogel electrolytes hold great potential in flexible zinc ion supercapacitors(ZICs)due to their high conductivity,good safety,and flexibility.However,freezing of electrolytes at low temperature(subzero)leads to drastic reduction in ionic conductivity and mechanical properties that deteriorates the performance of flexible ZICs.Besides,the mechanical fracture during arbitrary deformations significantly prunes out the lifespan of the flexible device.Herein,a Zn^(2+)and Li^(+)co-doped,polypyrrole-dopamine decorated Sb_(2)S_(3)incorporated,and polyvinyl alcohol/poly(N-(2-hydroxyethyl)acrylamide)double-network hydrogel electrolyte is constructed with favorable mechanical reliability,anti-freezing,and self-healing ability.In addition,it delivers ultra-high ionic conductivity of 8.6 and 3.7 S m^(-1)at 20 and−30°C,respectively,and displays excellent mechanical properties to withstand tensile stress of 1.85 MPa with tensile elongation of 760%,together with fracture energy of 5.14 MJ m^(-3).Notably,the fractured hydrogel electrolyte can recover itself after only 90 s of infrared illumination,while regaining 83%of its tensile strain and almost 100%of its ionic conductivity during−30–60°C.Moreover,ZICs coupled with this hydrogel electrolyte not only show a wide voltage window(up to 2 V),but also provide high energy density of 230 Wh kg^(-1)at power density of 500 W kg^(-1)with a capacity retention of 86.7%after 20,000 cycles under 20°C.Furthermore,the ZICs are able to retain excellent capacity even under various mechanical deformation at−30°C.This contribution will open up new insights into design of advanced wearable flexible electronics with environmental adaptability and long-life span.

关键词： Flexible zinc ion supercapacitor Hydrogel electrolyte Self-healing Anti-freezing

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Engineered high-strength biohydrogel as a multifunctional platform to deliver nucleic acid for ameliorating intervertebral disc degeneration

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Bioactive Materials 2023年第7期25卷 107-121页

作者： Tao Chen Qiuping Qian Pooyan Makvandi Ehsan Nazarzadeh Zare Qizhu Chen Linjie Chen Zhiguang Zhang Hao zhou Wenxian zhou Hui Wang Xiangyang Wang Yu Chen yunlong zhou Aimin Wu Department of Orthopaedics Key Laboratory of Orthopaedics of Zhejiang ProvinceThe Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical UniversityWenzhouZhejiang325000China Zhejiang Engineering Research Center for Tissue Repair Materials Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhouZhejiang325000China Institute for Bioengineering School of EngineeringThe University of EdinburghEdinburghEH93FBUK School of Chemistry Damghan UniversityDamghan36716-45667Iran Wenzhou Medical University WenzhouZhejiang325000China Materdicine Lab School of Life SciencesShanghai UniversityShanghai200444China

Intervertebral disc degeneration(IVDD)is a leading cause of low back pain.The strategy of using functional materials to deliver nucleic acids provides a powerful tool for ameliorating IVDD.However,the immunogenicity of nucleic acid vectors and the poor mechanical properties of functional materials greatly limit their effects.Herein,antagomir-204-3p(AM)shows low immunogenicity and effectively inhibits the apoptosis of nucleus pulposus cells.Moreover,a high-strength biohydrogel based on zinc-oxidized sodium alginate-gelatin(ZOG)is designed as a multifunctional nucleic acid delivery platform.ZOG loaded with AM(ZOGA)exhibits great hygroscopicity,antibacterial activity,biocompatibility,and biodegradability.Moreover,ZOGA can be cross-linked with nucleus pulposus tissue to form a high-strength collagen network that improves the mechanical properties of the intervertebral disc(IVD).In addition,ZOGA provides an advantageous microenvironment for genetic expression in which AM can play an efficient role in maintaining the metabolic balance of the extracellular matrix.The results of the radiological and histological analyses demonstrate that ZOGA restores the height of the IVD,retains moisture in the IVD,and maintains the tissue structure.The ZOGA platform shows the sustained release of nucleic acids and has the potential for application to ameliorate IVDD,opening a path for future studies related to IVD.

关键词： Intervertebral disc degeneration Hydrogel Nucleic acid MicroRNA Delivery Extracellular matrix

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Study of material agglomeration during nozzle injection of multiviscosity liquid into a fluidized bed reactor by the electric conductance method

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Particuology 2018年第3期16卷 174-184页

作者： NingYang yunlong zhou Tianyu Qi College of Energy Resource and Power Engineering Northeast Dianli University Jilin 132012 China Institute of Unclear and New Energy Technology Tsinghua University Beijing 100084 China

Fluidized bed agglomeration is an important and challenging problem for thermal cracking in fluid cokers. A low coker temperature can be problematic because the bitumen is injected into the fluidized bed with a different viscosity, resulting in formation of agglomerates of varying sizes, which slows the cracking reactions. In the present study, the bed material agglomeration process during nozzle injection of multi- viscosity liquid was investigated in a fluidized bed operated at different mass ratios of the atomization gas to the liquid jets （GLR= 1%-3.5%） and gas velocities （3.9Umf and 5,9Umf） based on a conductance method using a water-sand system to simulate the hot bitumen-coke system at room temperature. During the tests of liquid-jet dispersion throughout the bed, different agglomeration stages are observed at both gas velocities. The critical amount oftert-butanol in the liquid jets that could lead to severe agglomeration of the bed materials （poor fluidization） at GLR = 1% is about 10 wt% at the low fluidizing gas velocity （3.9Umf） and 18wt% at the high gas velocity （5,9Umf）. This study provides a new approach for on-line monitoring of bed agglomeration during liquid injection to guarantee perfect contact between the atomized liquid and the bed particles.

关键词： Material agglomeration Nozzle Multiviscosity Fluidized bed reactor Electric conductance

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Gas–liquid two-phase flow in serpentine microchannel with different wall wettability

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Chinese Journal of Chemical Engineering 2017年第7期25卷 874-881页

作者： yunlong zhou He Chang Tianyu Qi Energy and Power Engineering College Northeast Dianli University Institute of Energy Environment and Economy Tsinghua University

Gas–liquid flow in serpentine microchannel with different surface properties exhibits drastically different flow behavior. With water and air as working fluids, the method of numerical simulation was adopted in this paper based on CLSVOF(coupled level set and volume of fluid method) multiphase model. After verifying the reasonability of the model through experiment, by changing wall properties and Re number(Re<1500), the influences of contact angle and surface roughness on flow regime and Po number were discussed. Moreover, the difference of pressure drop between curve and straight microchannel was also calculated. Beyond that, the combined effect of curve channel and wall properties on flow resistance was analyzed. This paper finds that wall properties have great influence on gas–liquid flow in microchannels not only on flow regime but also flow characteristics. Meanwhile, the pressure drop in curve microchannels is larger than straight. It is more beneficial for fluid flowing when the straight part of microchannel is hydrophilic smooth wall and curve part is hydrophobic with large roughness.

关键词：气液两相流动微通道蛇纹石壁面润湿性多相流模型表面粗糙度流动特性

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Analysis of the nonlinear dynamic characteristics of two-phase flow based on an improved matrix pencil method

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Chinese Journal of Chemical Engineering 2016年第6期24卷 737-748页

作者： Hongwei Li Junpeng Liu yunlong zhou Bin Sun School of Energy and Power Engineering Northeast Dianli University

Gas–liquid two-phase flow is complex and has uncertainty in phase interfaces, which make the two-phase flow look very complicated. Even though the flow behavior(e.g. coalescence, crushing and separation) of single bubble or bubble groups in the liquid phase looks random, combining some established characteristics and methodologies can find regularities among the randomness. In order to excavate the nonlinear dynamic characteristics of gas–liquid two-phase flow, the authors developed an improved matrix pencil(IMP) method to analyze the pressure difference signals of the two-phase flow. This paper elucidates the influence of signal length on MP calculation results and the anti-noise-interference ability of the MP method. An IMP algorithm was applied to the fluctuation signals of gas–liquid two-phase flow to extract the mode frequency and damping ratio, which were combined with the component energy index(CEI) entropy to identify the different flow patterns. It is also found that frequency, damping ratio, CEI entropy and stability diagram together not only identify flow patterns, but also provide a new way to examine and understand the evolution mechanism of physical dynamics embedded in flow patterns. Combining these characteristics and methods, the evolution of the nonlinear dynamic physical behavior of gas bubbles is revealed.

关键词：非线性动力学特性气液两相流矩阵束法动态特性分析 IMP算法流动行为模态频率流动模式

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光热-跨临界压缩二氧化碳储能循环动态特性研究

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化工学报 2024年第5期75卷 2047-2059页

作者：王迪陈伟倩孙灵芳周云龙东北电力大学自动化工程学院吉林吉林132012

为了改善新能源发电波动对电网的影响,提出了一种光热-跨临界压缩二氧化碳储能(transcritical compressed carbon dioxide energy storage,TC-CCES)循环集成热力系统,采用模块化机理建模方法,基于能质平衡关系分别建立TC-CCES系统与光... 详细信息

为了改善新能源发电波动对电网的影响,提出了一种光热-跨临界压缩二氧化碳储能(transcritical compressed carbon dioxide energy storage,TC-CCES)循环集成热力系统,采用模块化机理建模方法,基于能质平衡关系分别建立TC-CCES系统与光热系统的动态数学模型,获取TC-CCES系统在储释能阶段关键参数的动态响应曲线。研究结果表明,系统的储能密度达到28.43 kW/m3,储能效率与循环效率分别为58.01%和60.85%,动态数学模型的最大误差均小于5%。此外,太阳直射辐射变化促使系统热源温度变化,而系统负荷对热源温度变化非常敏感,热源温度升高2.29%,换热器负荷升高3.36%,而且在某地区四季典型日冬季比秋季机组负荷低了23.9%。提出的动态数学模型可用于分析太阳能发电的动态特性,可为控制系统的设计提供理论参考。

关键词：光热 T-CO_(2)储能循环模型动态特性建模仿真

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基于Ti原子杂化微孔晶体结构的CO_(2)吸附特性和电荷转移机理研究

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工程热物理学报 2024年第1期45卷 115-121页

作者：杨宁刘振宇郝敬洋周云龙东北电力大学能源与动力工程学院吉林132012

替换SIFSIX类杂化微孔材料的金属位点或有机配体可以合成大量具有不同孔径的化合物,TiF_(6)^(2-)配体对CO_(2)吸附和电荷转移特性的影响机理尚不充分。本研究以此为背景在SIFSIX-3-Zn的基础上将SiF_(6)^(2-)的Si原子替换为Ti原子,构建了... 详细信息

替换SIFSIX类杂化微孔材料的金属位点或有机配体可以合成大量具有不同孔径的化合物,TiF_(6)^(2-)配体对CO_(2)吸附和电荷转移特性的影响机理尚不充分。本研究以此为背景在SIFSIX-3-Zn的基础上将SiF_(6)^(2-)的Si原子替换为Ti原子,构建了TiFSIX-3-Fe和TiFSIX-3-Zn模型,通过DFT分析了TiFSIX-3-M(TiF_(6)^(2-)为离子配体,M为金属位点,M=Fe/Zn)中CO_(2)在孔道内的吸附与电荷转移行为,计算了孔道内的CO_(2)吸附位点、能带结构、吸附能、差分电荷密度、Mulliken电荷分布。研究结果表明:TiFSIX-3-Fe和TiFSIX-3-Zn具有更小的孔道体积,分别为1.26×10^(5)nm^(3)和1.22×10^(5)nm^(3)。Ti原子加入改善了TiFSIX-3-Fe的能带结构,但对TIFSIX-3-Zn影响不明显。Ti构建的两种模型的吸附能最高分别为-0.356 e V和-0.361 eV。差分电荷密度表明电荷从F原子附近向C原子转移,结合Mulliken布居分析得到构型中电荷转移数量分别增大至0.072 e和0.075 e,TiFSIX-3-Fe和TiFSIX-3-Zn的CO_(2)吸附和电荷转移特性显著增强。本工作为开发具有高效CO_(2)捕集能力的杂化微孔材料提供了理论指导。

关键词： CO_(2)吸附 Ti原子掺杂电荷转移特性密度泛函理论

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竖直互连小通道内流动沸腾传热强化机理分析

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中国电机工程学报 2024年第12期44卷 4826-4836,I0018页

作者：周云龙邵文斌李洪伟胡中远东北电力大学能源与动力工程学院吉林省吉林市132012

为推动流动沸腾技术在燃料电池散热领域的应用,该文以R141b为工质,对不同流速下的并联直通道及互连小通道内流动沸腾情况进行三维瞬态数值模拟。利用换热系数、基底温度及综合换热因子等参数对比各结构的换热性能,并探究互连小通道的换... 详细信息

为推动流动沸腾技术在燃料电池散热领域的应用,该文以R141b为工质,对不同流速下的并联直通道及互连小通道内流动沸腾情况进行三维瞬态数值模拟。利用换热系数、基底温度及综合换热因子等参数对比各结构的换热性能,并探究互连小通道的换热强化机理。研究表明:换热趋势随气泡行为呈周期性变化,气泡脱离时的换热效果最佳;由连通口引发的二次流促进热量传递与壁温升高,使通道可提前2 ms满足成核条件,且气泡在10^(-4) m/s以上的二次流速作用下率先脱离;五连通通道的换热系数较并联直通道可提升19.6%~23.3%,继续增加连通口数,换热系数的相对增长率均不足3.5%;涡结构使压降随连通口数增加而增大,且增势并不减弱,八连通通道的压降较并联直通道增加29.5%~42%。可见,二次流在影响气泡行为、强化换热的同时也带来压力损失,综合换热性能与连通口数目不成正相关。

关键词：连通式小通道流动沸腾强化机理数值模拟

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大众迈腾B8L轿车启动系统工作过程与故障诊断分析

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现代工业经济和信息化 2024年第4期14卷 84-85,170页

作者：周云龙洛阳职业技术学院河南洛阳471000

以大众迈腾B8L轿车发动机启动系统为例,分析启动系统的工作过程以及当启动系统出现故障时的诊断流程和思路。分析认为,维修人员熟悉该车发动机启动系统的工作过程,能够对启动系统工作条件是否正常进行判断,以及可以熟练掌握该车发动机... 详细信息

以大众迈腾B8L轿车发动机启动系统为例,分析启动系统的工作过程以及当启动系统出现故障时的诊断流程和思路。分析认为,维修人员熟悉该车发动机启动系统的工作过程,能够对启动系统工作条件是否正常进行判断,以及可以熟练掌握该车发动机启动系统的诊断流程。

关键词：迈腾B8L 启动系统工作过程故障诊断

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火灾后铁尾矿砂混凝土梁抗弯性能试验研究

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西安建筑科技大学学报（自然科学版） 2024年第2期56卷 220-228页

作者：杨志年毛震周云龙雷翔宇华北理工大学建筑工程学院河北唐山063210 河北省地震工程与防灾重点实验室河北唐山063210 河北省建筑结构绿色建造技术创新中心河北唐山063210

为研究铁尾矿砂全部替代天然砂对混凝土梁火灾后抗弯性能的影响,对3根受火45 min和3根非受火混凝土梁进行了静载试验.对比了受火过程中梁内混凝土和钢筋温度分布、梁跨中挠度以及火灾后静载试验荷载-挠度曲线、残余抗弯承载力、破坏形态... 详细信息

为研究铁尾矿砂全部替代天然砂对混凝土梁火灾后抗弯性能的影响,对3根受火45 min和3根非受火混凝土梁进行了静载试验.对比了受火过程中梁内混凝土和钢筋温度分布、梁跨中挠度以及火灾后静载试验荷载-挠度曲线、残余抗弯承载力、破坏形态,验证了平截面假定,分析了铁尾矿砂全部替代天然砂和不同铁尾矿砂混凝土强度对钢筋混凝土梁火灾后抗弯性能的影响.结果表明:铁尾矿砂混凝土梁与天然砂混凝土梁受火过程中混凝土和钢筋温度、跨中挠度无明显差异,受火45 min后满足平截面假定;铁尾矿砂混凝土梁的火灾后残余抗弯承载力与天然砂混凝土梁无明显差异,但破坏时跨中挠度显著增加;不同铁尾矿砂混凝土强度(C30、C40)对梁火灾后抗弯承载力影响不大.

关键词：铁尾矿砂混凝土简支梁火灾后抗弯性能平截面假定

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