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Design of broadband achromatic metasurface device based on phase-change material Ge_(2)Sb_(2)Te_(5)

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Chinese Physics B 2022年第12期31卷 259-265页

作者： Shuyuan Lv Xinhui Li Wenfeng Luo Jie Jia Xi’an University of Posts&Telecommunications School of Electronic EngineeringXi’an 710121China

Based on the phase-change material Ge_(2)Sb_(2)Te_(5)(GST),achromatic metasurface optical device in the longer-infrared wavelength is *** the combination of the linear phase gradient GST nanopillar and the adjustment of the crystalline fraction m value of GST,the polarization insensitive achromic metalenses and beam deflector metasurface within the longer-infrared wavelength 9.5μm to 13μm are *** design results show that the achromatic metalenses can be focused on the same focal plane within the working *** simulation calculation results show that the fullwidth at half-maximum(FWHM)of the focusing spot reaches the diffraction limit at each *** addition,the same method is also used to design a broadband achromatic beam deflector metasurface with the same deflection angle of 19°.The method proposed in this article not only provides new ideas for the design of achromatic metasurfaces,but also provides new possibilities for the integration of optical imaging,optical coding and other related optical systems.

关键词： metasurface optical device phase-change material achromatic

Paraffin/SiC as a Novel Composite phase-change material for a Lithium-Ion Battery Thermal Management System

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Transactions of Tianjin University 2021年第1期27卷 55-63页

作者： Wei Kang Yiqiang Zhao Xueheng Jia Lin Hao Leping Dang Hongyuan Wei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Tianjin Lishen Battery Joint-Stock Co. LtdTianjin 300072China

A lithium-ion battery thermal management system has always been a hot spot in the battery industry. In this study, a novel high-thermal-conductivity composite phase-change material(CPCM) made by paraffin wax and silicon was adopted to facilitate heat transfer. Moreover, high resistance or even insulation of CPCM is capable of preventing short circuits between the cells. The heat transfer mechanism of CPCMs was determined under a scanning electron microscope. A thermogravimetric analyzer was employed to determine the thermal stability. A diff erential scanning calorimeter was used to explore the thermophysical properties of the composite samples. By comparing the results of the experiment, it was reported that under the silicon carbide content of 5%, the parameters were better than others. The phase-change enthalpy of CPCM was 199.4 J/g, the leakage rate of liquid was 4.6%, and the melting point was 53.6℃. To verify the practicality of CPCM, a three-dimensional layered battery pack model was built in the COMSOL Multiphysics software. By simulating the thermal runaway inside the battery packs of various materials, it was reported that the addition of CPCM significantly narrowed the temperature range of the battery pack from 300–370 to 303–304 K. Therefore, CPCM can eff ectively increase the rate of heat transfer to prevent the chain of thermal runaway reactions. It also enables the battery pack to run at a stable temperature.

关键词： Lithium-ion battery phase-change material Paraffin Silicon carbide Thermal runaway

Heat Transfer of Heat Sinking Vest with phase-change material

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Chinese Journal of Aeronautics 2011年第6期24卷 720-725页

作者： QIU Yifen JIANG Nan WU Wei ZHANG Guangwei XIAO Baoliang School of Aeronautic Science and Engineering Beihang University Beijing 100191 China Aerospace Life-support Industries Ltd. Xiangfan 441003 China

To investigate thermal protection effects of heat sinking vest with phase-change material （PCM）, human thermoregulation model is introduced, and a thermal mathematical model of heat transfer with phase change has been developed with the enthalpy method. The uniform energy equation is constructed for the whole domain, and the equation is implicitly discreted by control volume and finite difference method. Then the enthalpy in each node is solved by using chasing method to calculate the tridiagonal equations, and the inner surface temperature of PCM could be obtained. According to the human thermoregulation model of heat sinking vest, the dynamic temperature distribution and sweat of the body are solved. Calculation results indicate that the change of core temperature matches the experimental result, and the sweat difference is small. This thermal mathematical model of heat transfer with phase change is credible and appropriate. Through comparing the dynamic temperature distribution and sweat of the body wearing heat sinking vest to results of the body not wearing this clothing, it is evident that wearing heat sinking vest can reduce the body heat load significantly.

关键词： thermal protection heat sinking vest heat transfer phase-change material enthalpy method

Universal memory based on phase-change materials:From phase-change random access memory to optoelectronic hybrid storage

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Chinese Physics B 2021年第5期30卷 128-149页

作者： Bo Liu Tao Wei Jing Hu Wanfei Li Yun Ling Qianqian Liu Miao Cheng Zhitang Song Research Center for Nanophotonic and Nanoelectronic materials School of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China State Key Laboratory of Functional materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

The era of information explosion is coming and information need to be continuously stored and randomly accessed over long-term periods,which constitute an insurmountable challenge for existing data *** present,computing devices use the von Neumann architecture with separate computing and memory units,which exposes the shortcomings of“memory bottleneck”.Nonvolatile memristor can realize data storage and in-memory computing at the same time and promises to overcome this ***-change random access memory(PCRAM)is called one of the best solutions for next generation non-volatile *** to its high speed,good data retention,high density,low power consumption,PCRAM has the broad commercial prospects in the in-memory computing *** this review,the research progress of phase-change materials and device structures for PCRAM,as well as the most critical performances for a universal memory,such as speed,capacity,and power consumption,are *** comparing the advantages and disadvantages of phase-change optical disk and PCRAM,a new concept of optoelectronic hybrid storage based on phase-change material is ***,its feasibility to replace existing memory technologies as a universal memory is also discussed as well.

关键词： universal memory optoelectronic hybrid storage phase-change material phase-change random access memory

Investigation of phase-change materials for interior temperature regulation in public transport

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Clean Energy 2022年第1期6卷 178-192页

作者： Md Nahidul Islam Md Nahid Hossain Dewan HasanAhmed Department of Mechanical and Production Engineering Ahsanullah University of Science and Technology141-142 Love RoadTejgaon Industrial AreaDhakaBangladesh

Regulating the indoor temperature of public transport on hot sunny days is a prime concern,as both the external and internal heat sources play an active role in heat *** studies have been carried out on a bus model using sodium sulphate decahydrate as a phase-change material(PCM)that is placed in between the ceiling and the *** are conducted on a sunny day and also for different cases of external(300-W surface heater)and internal(25-W light bulb)heat *** results show that PCM,in the presence of an external heat source,can help to keep the indoor temperature lower and delay the time period for increasing the temperature by absorbing heat during the phase *** the other hand,the presence of the internal heat source contributes to a detrimental effect on the indoor temperature,which gradually increases with the elapse of *** the combination of the external and internal heat sources,it is found that the internal heat source plays a dominating factor to raise the indoor *** is revealed from the experimental results that a 12.7-mm single layer and a single PCM are not enough to counter the internal heat of 25 W unless the thickness of the PCM layer is increased to delay the increase in the indoor *** additional PCM layer with a lower melting temperature could be placed at the inner portion of the ceiling to have effective thermal-energy storage by absorbing the substantial heat gain from the internal heat sources.

关键词： latent heat sodium sulphate decahydrate phase-change material transportation thermal-energy storage

Experimental Investigation of a phase-changematerial’s Stabilizing Role in a Pilot of Smart Salt-Gradient Solar Ponds

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Frontiers in Heat and Mass Transfer 2024年第1期22卷 341-358页

作者： Karim Choubani Ons Ghriss Nashmi H.Alrasheedi Sirin Dhaoui Abdallah Bouabidi Department of Mechanical Engineering College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadh11432Saudi Arabia Mechanical Modeling Energy&Materials(M2EM)UR17ES47National School of Engineers of Gabes(ENIG)University of GabesAvenue of Omar Ib-ElkhattabZrigGabes6023Tunisia National Engineering School of Gabes(ENIG) Research Laboratory“ProcessesEnergetics Environment and Electrical Systems”Gabes UniversityOmar Ibn Kattab ZrigGabes6029Tunisia

Faced with the world’s environmental and energy-related challenges,researchers are turning to innovative,sustainable and intelligent solutions to produce,store,and distribute *** work explores the trend of using a smart sensor to monitor the stability and efficiency of a salt-gradient solar *** studies have been conducted to improve the thermal efficiency of salt-gradient solar ponds by introducing other *** study investigates the thermal and salinity behaviors of a pilot of smart salt-gradient solar ponds with(SGSP)and without(SGSPP)paraffin wax(PW)as a phase-change material(PCM).Temperature and salinity were measured experimentally using a smart sensor,with the measurements being used to investigate the stabilizing effects of placing the PCM in the solar pond’s lower convective *** experimental results show that the pond with the PCM(SGSPP)achieved greater thermal and salinity stability,with there being a lesser temperature and salinity gradient between the different layers when compared to a solar pond without thePCM(SGSP).The use of the PCM,therefore,helped control the maximum and minimum temperature of the pond’s storage *** UCZ has been found to operate approximately 4 degrees above the average ambient temperature of the day in the SGSPP and 7 degrees in ***,an unstable situation is generated after 5 days from starting the operation and at 1.9 m from the bottom,and certain points have the tendency to be neutral from the upper depths in 1,3 m of the bottom.

关键词： Smart salt-gradient solar pond phase-change material experimental investigation stability of solar ponds

Study on preparation,characterization and application of mixed-colorants thermochromic microcapsules

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Particuology 2024年第5期88卷 89-97页

作者： Lan Zhou Jingpeng Ye Qinze Cai Guojin Liu Mehran Dadgar Guocheng Zhu Guoqing Zhang College of Textile Science and Engineering (International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou310018China School of materials Science& Engineering Zhejiang Sci-Tech UniversityHangzhou310018China Department of Textile University of NeyshaburAdib BoulevardKhorasan Razavi ProvinceIran Zhejiang Charming Dyeing and Finishing Co. LtdJiaxing314500China Zhejiang Provincial Innovation Center of Advanced Textile Technology Shaoxing312000China

In order to expand the color-change range and make the discoloration temperature suitable for the daily textiles,a new formulation of mixed-colorants thermochromic core material is designed,in which crystal violet lactone(CVL)is the basic color former,bisphenol A(BPA)is the developer,especially the solvent-based dye and dodecyl dedecanoate are used as the extended dye and the solvent,*** electron microscope(SEM),differential scanning calorimeter(DSC)and thermogravimetric analyzer(TGA)were applied to study the morphology,encapsulation rate,non-isothermal crystallization behavior and thermal stability of the mixed-colorant thermochromic microcapsules(MCTMs)prepared by in-situ *** results show that MCTMs have good sphericity,uniform particle size,good thermal stability and the encapsulation rate can reach 86.73%.Under the non-isothermal conditions,the encapsulation of formaldehyde-melamine resin wall material can slightly reduce the crystallization rate of the solvent,but does not affect the relative crystallinity,thermal properties and discoloration sensitivity of the core *** the variety of ambient temperatures in the range of 20–35℃,the printed cotton fabrics with MCTMs could change color reversibly between different tones with good reliability and durability,and exhibit more gorgeous colors than the common thermochromic materials.

关键词： Thermochromic microcapsule Color-change range phase-change material Crystallization behavior

Beam switching and bifocal zoom lensing using active plasmonic metasurfaces

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Light(Science & Applications) 2017年第1期6卷 363-369页

作者： Xinghui Yin Tobias Steinle Lingling Huang Thomas Taubner Matthias Wuttig Thomas Zentgraf Harald Giessen th Physics Institute and Research Center SCoPE University of Stuttgart70550 StuttgartGermany Max-Planck-Institute for Solid State Research Heisenbergstrasse 170569 StuttgartGermany Beijing Institute of Technology No.5 South Zhongguancun StreetBeijing 100081China I.Institute of Physics(IA) RWTH Aachen University52056 AachenGermany Department of Physics University of PaderbornWarburger Straße 10033098 PaderbornGermany

Compact nanophotonic elements exhibiting adaptable properties are essential components for the miniaturization of powerful optical technologies such as adaptive optics and spatial light *** the larger counterparts typically rely on mechanical actuation,this can be undesirable in some cases on a microscopic scale due to inherent space ***,we present a novel design concept for highly integrated active optical components that employs a combination of resonant plasmonic metasurfaces and the phase-change material *** particular,we demonstrate beam switching and bifocal lensing,thus,paving the way for a plethora of active optical elements employing plasmonic metasurfaces,which follow the same design principles.

关键词： active beam-forming metasurfaces phase-change material plasmonics

phase-change composite filled natural nanotubes in hydrogel promote wound healing under photothermally triggered drug release

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Bioactive materials 2023年第3期21卷 284-298页

作者： Jing-Jing Ye Long-Fei Li Rui-Nan Hao Min Gong Tong Wang Jian Song Qing-Han Meng Na-Na Zhao Fu-Jian Xu Yuri Lvov Li-Qun Zhang Jia-Jia Xue Beijing Laboratory of Biomedical materials State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing100029PR China College of materials Science and Engineering Beijing University of Chemical TechnologyBeijing100029PR China Beijing Laboratory of Biomedical materials Beijing University of Chemical TechnologyBeijing100029PR China Institute for Micromanufacturing and Biomedical Engineering Program Louisiana Tech UniversityRustonLA71272USA

It is of great importance to treat a bacterial-infected wound by a smart dressing capable of delivering antibiotics in a smart manner without causing drug *** construction of smart release nanocontainers responsive to near-infrared(NIR)laser irradiation in an on-demand and stepwise way is a promising strategy for avoiding the emergence of multidrug-resistant ***,we develop a hydrogel composite made of alginate and nanotubes with an efficient NIR-triggered release of rifampicin and outstanding antibacterial *** composite hydrogel is prepared through co-encapsulating antibacterial drug(rifampicin),NIR-absorbing dye(indocyanine green),and phase-change materials(a eutectic mixture of fatty acids)into halloysite nanotubes,followed by incorporation into alginate hydrogels,allowing the in-situ gelation at room temperature and maintaining the integrity of drug-loaded *** them,the eutectic mixture with a melting point of 39℃ serves as the biocompatible phase-change material to facilitate the NIR-triggered drug *** resultant phase-change material gated-nanotubes exhibit a prominent photothermal efficiency with multistep drug release under laser *** an in vitro assay,composite hydrogel provides good antibacterial potency against Staphylococcus aureus,one of the most prevalent microorganisms of dangerous gas gangrene.A bacterial-infected rat full-thickness wound model demonstrates that the NIR-responsive composite hydrogel inhibits the bacteria colonization and suppresses the inflammatory response caused by bacteria,promoting angiogenesis and collagen deposition to accelerate wound *** NIR-responsive composite hydrogel has a great po-tential as an antibacterial wound dressing functionalized with controlled multistep treatment of the infected sites.

关键词： Anti-bacteria Clay nanotubes Alginate hydrogel phase-change material NIR-Triggered drug release Infected wound healing