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Novel self-assembled porous yolk-shell NiO nanospheres with excellent electrochromic performance for smart windows

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Particuology 2024年第1期84卷 72-80页

作者： Baoshun Wang Ya Huang siming zhao Run Li Di Gao Hairong Jiang Rufan Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China

With the rapid development of optoelectronics,electrochromic(EC)materials(ECMs)with the advan-tages of low power consumption,easy viewing,high contrast ratio,etc have attached more and more attention from the fields of smart windows,electronic billboards,emerging wearable and portable electronics,and other next-generation *** oxide(NiO)is a promising candidate for high-performance ECMs because of its neutral-colored states and low ***,NiO-based ECMs still face the problem of slow switching speed due to their low electrical conductivity and small lattice ***-organic frameworks(MOFs)are promising candidates to fabricate hollow and porous transition metal oxides(TMOs)with high ion transport efficiency,excellent specific capacitance,and electrochemical *** this work,porous yolk-shell NiO nanospheres(PYS-NiO NSs)were syn-thesized via a solvothermal and subsequent calcination process of Ni-MOF,which exhibited outstanding EC *** the large specific surface areas and hollow porous nanostructures were conducive to ionic transport,PYS-NiO NSs exhibited a fast coloring/bleaching speed(3.6/3.9 s per one coloring/bleaching cycle)and excellent cycling stability(82%of capacity retention after 3000 cycles).These superior EC properties indicated that the PYS-NiO NSs was a promising candidate for high-performance EC *** work provides a new and feasible strategy for the efficient preparation of TMOs ECMs with good EC performance,especially fast switching speed.

关键词： Electrochromic Nickel oxide Metal-organic frameworks Hollow structure Smart windows

Incorporation ofκ-carrageenan improves the practical features of agar/konjac glucomannan/κ-carrageenan ternary system

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Food Science and Human Wellness 2023年第2期12卷 512-519页

作者： Dongling Qiao Hao Li Fatang Jiang siming zhao Sheng Chen Binjia Zhang Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing College of Food ScienceSouthwest UniversityChongqing 400715China Glyn O.Phillips Hydrocolloid Research Centre at HBUT School of Food and Biological EngineeringHubei University of TechnologyWuhan 430068China Group for Cereals and Oils Processing College of Food Science and TechnologyKey Laboratory of Environment Correlative Dietology(Ministry of Education)Huazhong Agricultural UniversityWuhan 430070China Yellow Crane Tower Science and Technology Park(Group)Co. Ltd.Wuhan 430040China

Three materials(agar,konjac glucomannan(KGM)andκ-carrageenan)were used to prepare ternary systems,i.e.,sol-gels and their dried composites conditioned at varied relative humidity(RH)(33%,54%and 75%).Combined methods,e.g.,scanning electron microscopy,small-angle X-ray scattering,infrared spectroscopy(IR)and X-ray diffraction(XRD),were used to disclose howκ-carrageenan addition tailors the features of agar/KGM/κ-carrageenan ternary *** affirmed by IR and XRD,the ternary systems withκ-carrageenan below 25%(agar/KGM/carrageenan,50:25:25,m/m)displayed proper component interactions,which increased the sol-gel transition temperature and the hardness of obtained *** instance,the ternary composites could show hardness about 3 to 4 times higher than that for binary *** gels were dehydrated to acquire ternary *** to agar/KGM composite,the ternary composites showed fewer crystallites and nanoscale orders,and newly-formed nanoscale structures from chain *** multi-scale structures,for composites withκ-carrageenan below 25%,showed weaker changes with RH,as revealed by especially morphologic and crystalline ***,the ternary composites with lessκ-carrageenan(below 25%)exhibited stabilized elongation at break and hydrophilicity at different *** hints to us that agar/KGM/κ-carrageenan composite systems can display series applications with improved features,e.g.,increased sol-gel transition point.

关键词： Agar/konjac glucomannan/κ-carrageenan ternary system Component interaction Multi-scale structure Practical features

Oxygen-deficient tungsten oxide nanoflowers for dynamically tunable near-infrared light transmittance of smart windows

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Nano Research 2023年第10期16卷 12165-12172页

作者： Ya Huang Baoshun Wang Pei Lyu siming zhao Xueke Wu Shiliang Zhang Run Li Qinyuan Jiang Fei Wang Yanlong zhao Rufan Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Electrochromic smart windows have attracted much attention in energy-saving buildings because of their ability to selectively modulate visible(VIS)and near-infrared(NIR)light *** is known,the NIR region accounts for about 50%of the total solar ***,reducing the NIR transmittance of windows will play a crucial role in reducing the energy consumption of ***,for most of the reported electrochromic materials(ECMs)-based windows,it remains a longlasting challenge about how to achieve a low NIR transmittance during the past *** this work,we synthesize oxygendeficient tungsten oxide(WO_(3−x))nanoflowers(NFs)by a simple and efficient method that is facile for their mass *** WO_(3−x)NFs exhibit low NIR transmittance of only 4.11%,0.60%,and 0.19%at 1200,1600,and 1800 nm,respectively,due to the localized surface plasmon resonance(LSPR)***,the WO_(3−x)NFs exhibit an excellent dual-band modulating ability for both VIS and NIR *** are able to operate in three distinct modes,including a bright mode,a cool mode,and a dark ***,the WO_(3−x)NFs exhibit a fast bleaching/coloring time(1.54/6.67 s),and excellent cycling stability(97.75%of capacity retention after 4000 s).

关键词： electrochromic tungsten oxide dual-band smart window infrared

Nitrogen-doped carbon dots-modified Prussian blue with sandwichlike structure as a high-performance electrochromic material

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Nano Research 2024年第10期17卷 9174-9180页

作者： Yaqi Zhang Lide Li siming zhao Yilin Ding Nan Shen Yujie Sun Hao Wang Jingfa Li Rufan Zhang School of Chemistry and Materials Science School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Prussian blue(PB),as a promising inorganic electrochromic material(ECM),has been widely used in smart windows,displays,sensors,***,there are still many challenges for PB to achieve high electrochromic ***,we synthesized nitrogen-doped carbon dots-modified PB film(defined as PB@N-CDs)with a sandwich-like structure by a simple stepwise electrodeposition *** carbon dots show an obvious advantage in ultrafast electron transfer ability,which can reduce charge loss during the transfer process,improve the electrochemical activity on both sides of PB,and thus facilitate a rapid electrochromic ***,the surface of nitrogen-doped carbon dots contains multiple organic functional groups,which widen the movement path of K+ions under electrostatic ***,the PB@N-CDs film exhibits a short bleaching/coloring time(0.5/0.9 s)and a superior optical modulation range(78.6%).Particularly,the coloring efficiency has been significantly improved to 137.71 cm^(2)/C(at 700 nm).All of these results open up new avenues for developing highperformance PB-based ECMs and promoting their applications in corresponding electrochromic devices(ECDs)and smart windows.

关键词： electrochromic Prussian blue carbon dots nanostructure

Multicolored structural coloration of carbon nanotube fibers

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SusMat 2023年第1期3卷 102-110页

作者： Run Li Shiliang Zhang Hang Chen Ya Huang Baoshun Wang Xueke Wu Qinyuan Jiang siming zhao Fei Wang Yanlong zhao Rufan Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijingChina

Carbon nanotube fibers(CNTFs)are endowed with excellent mechanical,electrical,and thermal properties and are considered promising candidates in numerous cutting-edge ***,the inherent black color of CNTFs hinders their practical application in fields with high aesthetic requirements such as wearable devices and smart *** to the smooth surface and chemical inertness,CNTFs are hard to be dyed by conventional chemical dyes or colorful ***,we realize a structural coloration of CNTFs by coating them with two metal oxide layers via atomic layer *** three elements of color,that is,hue,saturation,and brightness,can be controlled by adjusting the types and thickness of each oxide *** CNTFs with wide color gamut and high saturation are achieved through different combinations.A film interference model is also established to reveal the mechanism of the structural coloration,which is a comprehensive result of thin-film interference and surface roughness *** calculated reflectance well fits the measured results by introducing surface roughness ***,the colored CNTFs are not iridescent because of retinal signal delay,which will further expand their applications.

关键词： atomic layer deposition carbon nanotube structural color

A Methodology of Requirements Validation for Aviation System Development

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A Methodology of Requirements Validation for Aviation System...

蒸煮工艺和化学成分对米饭应力松弛特性的影响

第32届中国控制与决策会议

作者： Xiao Fei Chen Bin zhao siming COMAC Shanghai Aircraft Design ＆ Research Institute

Systems engineering is an interdisciplinary field of engineering and engineering management that focuses on how to design and manage complex systems over their life *** engineering is one of the main steps in systems engineering *** validation is the process of ensuring that the specified requirements are sufficiently correct and complete so that the product will meet the stakeholder needs and *** development of civil aviation systems requires high-quality products to be generated to ensure compliance with certification issues and safety ***,a formal approach to systems engineering is applicable and a well-defined process of requirement validation is *** paper presents a requirement validation methodology for aviation systems *** full paper describes the model and methods for the requirements validation process and identifies each step in the process in detail,including inputs,outputs,roles and responsibilities,and *** proposed methodology is executable for implementation and compliant with the certification guideline ARP4754 *** applicability and completeness are tested via a dedicated case study.

关键词： Systems engineering requirements validation aviation system

来源： cnki会议评论

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农业工程学报 2007年第10期23卷 235-240页

作者：许永亮熊善柏赵思明华中农业大学食品科技学院湖北430070

用4种工艺制作米饭,用质构仪测定米饭的应力松弛曲线,并分析米饭的主要化学成分,研究米饭的应力松弛参数与化学成分的关系,为米饭蒸煮工艺的优化和新型炊具的开发提供基础数据。结果表明,不同工艺蒸煮的米饭的应力松弛参数有较大的差异... 详细信息

用4种工艺制作米饭,用质构仪测定米饭的应力松弛曲线,并分析米饭的主要化学成分,研究米饭的应力松弛参数与化学成分的关系,为米饭蒸煮工艺的优化和新型炊具的开发提供基础数据。结果表明,不同工艺蒸煮的米饭的应力松弛参数有较大的差异性,较低温度下蒸煮的米饭的硬度较大,较高温度下蒸煮米饭的黏性较大。米饭的平衡弹性系数E0为15.754～89.323Pa;衰减弹性系数E1为34887.528～35213.051Pa;松弛时间τ为0.130～0.179s;松弛非线性指数n为0.019～0.054,黏度系数η为4538.085～6248.998Pa.s。米饭为具有一定交联程度的黏弹性体,其松弛参数与米饭的化学成分有较大关系,蛋白质含量较高的米饭的E0、τ和η较大;脂肪含量较高的米饭的E0较小;直链淀粉含量较高的米饭的E1和τ较小。建立的基于米饭的化学成分与米饭松弛参数的多元幂函数式方程具有较高的拟合精度。

关键词：米饭蒸煮工艺应力松弛

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基于机器视觉技术的淡水鱼品种识别

农业工程学报 2011年第11期27卷 388-392页

作者：张志强牛智有赵思明华中农业大学工学院武汉430070 华中农业大学食品科技学院武汉430070

为了后续加工便利,需要对打捞上来的淡水鱼进行分类,而且分类是淡水鱼加工前处理的重要工序之一。为了实现淡水鱼的自动分类,该研究通过收集常见的4种淡水鱼240条为试验样本,分别为鲢鱼、鲫鱼、鳊鱼和鲤鱼。通过运用机器视觉技术采集各... 详细信息

为了后续加工便利,需要对打捞上来的淡水鱼进行分类,而且分类是淡水鱼加工前处理的重要工序之一。为了实现淡水鱼的自动分类,该研究通过收集常见的4种淡水鱼240条为试验样本,分别为鲢鱼、鲫鱼、鳊鱼和鲤鱼。通过运用机器视觉技术采集各种淡水鱼的图像,并运用数字图像处理技术对图像进行处理,提取其各个颜色分量及长短轴之比等特征值,最后运用该特征值建立有关淡水鱼的品种识别模型。研究表明,通过该识别模型可以完全实现对鲢鱼、鲫鱼、鳊鱼和鲤鱼这4种淡水鱼的品种的识别,准确率达到96.67%。机器视觉技术可以快速准确对常见的淡水鱼进行品种识别,具有较强的实际应用价值。

关键词：机器视觉鱼图像处理品种识别

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大米生产线上细菌和霉菌的分布特性

农业机械学报 2009年第5期40卷 135-138页

作者：胡坚刘巧瑜赵思明华中农业大学食品科技学院武汉430070 江南大学食品科技学院无锡214000

以桃花香米和金健香米为对象,研究夏季和秋季大米生产线上细菌和霉菌的分布特性,以确定稻米加工过程中的微生物控制关键点。结果表明,从原料稻谷到成品米的加工过程中,细菌和霉菌的数量逐渐减少,各采样点细菌总数高于霉菌总数。微生物... 详细信息

以桃花香米和金健香米为对象,研究夏季和秋季大米生产线上细菌和霉菌的分布特性,以确定稻米加工过程中的微生物控制关键点。结果表明,从原料稻谷到成品米的加工过程中,细菌和霉菌的数量逐渐减少,各采样点细菌总数高于霉菌总数。微生物种类和采样点对微生物数量影响达到极显著水平(α<0.000 1)。大米品种对微生物数目达到显著影响,加工季节对微生物数量影响不大。

关键词：大米生产线细菌霉菌分布特性