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Enhancement of Near-Field Radiative Heat Transfer based on High-Entropy Alloys

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Research and Application of Materials Science 2022年第2期4卷 1-4页

作者： Shanshan DENG Ping SONG Boxi ZHANG Sen YAO Zhixin JIN Defeng GUO State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004P.R.China

The enhancement of near-field radiative heat transfer(NFRHT)has now become one of the research hotspots in the fieldsof thermal management and imaging due to its ability to improve the performance of near-field thermoelectric devices and near-field imaging systems.In this paper,we design three structures(multilayer structure,nanoporous structure,and nanorod structure)based on high-entropy alloys to realize the enhancement of NFRHT.By combining stochastic electrodynamicsand Maxwell-Garnett's description of the effective medium,we calculate the radiative heat transfer under different parametersand find that the nanoporousstructure has the largest enhancement effect on NFRHT.The near-field heat transfer factor(q)of this structure(q=1.40×10^(9)W/(m^(2)·K))is three times higher than that of the planestructure(q=4.6×10^(8)W/(m^(2)·K)),and about two orders of magnitude higher than that of the SiO2plate.Thisresult providesa freshidea for the enhancement of NFRHT and will promote the application of high-entropy alloy materials in near-field heat radiation.

关键词： near-field radiative heat transfer high-entropy alloys multilayer structure nanoporous structure nanorod structure

A novel two-dimensional accordion-like titanium carbide (MXene) for adsorption of Cr(VI) from aqueous solution

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Journal of Advanced Dielectrics 2018年第5期8卷 42-46页

作者： Yi Tang Chenhui Yang Wenxiu Que Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research Xi’an Jiaotong University Xi’an 710049 ShaanxiP.R.China Shaanxi Engineering Research Center of Advanced Energy Materials and Devices School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049ShaanxiP.R.China

Herein,we report on a novel two-dimensional(2D)material application,which shows that an accordion-like layered Ti_(3)C_(2) nanomaterial(MXene)with an excellent adsorption capacity of Cr(VI)from aqueous solution was prepared by etching Al layer from Ti3AlC2 phase in hydrofluoric acid(HF)solution.Ti_(3)C_(2) nanopowders were well characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and the physical property of as-obtained samples was studied by UV–Vis diffuse reflectance spectra(DRS).After HF treatment,Ti3AlC2 not only has a phase transition from one crystal to another,but surprisingly,its microstructure is also undergoing an obvious change.Ti_(3)C_(2) with product of change possesses an accordion-like multilayer structure,and a relatively higher specific surface area(SSA)than untreated Ti3AlC2.Then,accordionlike Ti_(3)C_(2) with a high SSA provides abundant active sites for pollutant removal and functionalization.Accordion-like Ti_(3)C_(2) nanomaterial exhibits a stable adsorption capacity,and 1 g as-prepared accordion-like Ti_(3)C_(2) powders can remove about 80 mg potassium dichromate.Therefore,the results suggest that 2D MXenes are promising as an effective nanoadsorbent in heavy metal removal from the wastewater.

关键词： Two-dimensional material MXene multilayer structure adsorption.

Electrocaloric devices part Ⅰ:Analytical solution of one-dimensional transient heat conduction in a multilayer electrocaloric system

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Journal of Advanced Dielectrics 2020年第6期10卷 19-28页

作者： Farrukh Najmi Wenxian Shen Lorenzo Cremaschi Z.-Y.Cheng Materials Research and Education Center Auburn University AuburnAL 36849USA Department of Mathematics and Statistics Auburn UniversityAuburnAL 36849USA Department of Mechanical Engineering Auburn University AuburnAL 36849USA

The analytical solution is reported for one-dimensional(1D)dynamic conduction heat transfer within a mulilayer system that is the typical structure of electrocaloric devices.Here,the multilayer structure of typical electrocaloric devices is simplified as four layers in which two layers of electrocaloric materials(ECMs)are sandwiched between two semi infinite bodies representing the thermal sink and source.The temperature of electrocaloric layers can be instantaneously changed by extemal electic field to establish the initial temperature profile.The analytical solution includes the temperatures in four bodies as a function of both time and location and heat flux through each of the three interfaces as a function of time.Each of these analytical solutions includes five infinite series.It is proved that each of these series is convergent so that the sum of each series can be calculated using the first N terms of the series.The formula for calculating the value of N is presented so that the simulation of an electrocaloric device,such as the temperature distribution and heat transferred from one body to another can be performed.The value of N is dependent on the thickness of electrocaloric material layers,the time of heat conduction,and thermal properties of the materials used.Based on a case study,it is concluded that the N is mostly less than 20 and barely reaches more than 70.The application of the analytical solutions for the simulation of real electrocaloric devices is discussed.

关键词： Thermal conduction multilayer structure electrocaloric effect heat pump

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反铁磁/非磁多层结构的磁极化激元

东南大学学报(自然科学版) 1988年第5期 129-133页

作者：朱宁加曹恕南京工学院物理化学系

1972年,C. Manohar和G. Venkataraman讨论了反铁磁体中磁振子和电磁波（光子）的耦合模式,他们假设了外加静磁场H;为零,这样自旋波的自身涨落导致光子场变化的磁光效应就显示出来,而这种相互作用在反铁磁体的磁振子与外加光子的耦合中... 详细信息

1972年,C. Manohar和G. Venkataraman讨论了反铁磁体中磁振子和电磁波（光子）的耦合模式,他们假设了外加静磁场H;为零,这样自旋波的自身涨落导致光子场变化的磁光效应就显示出来,而这种相互作用在反铁磁体的磁振子与外加光子的耦合中起着重要作用。1975年,S. M. Bose又在反铁磁体中讨论了外加静磁场H;不为零且沿晶轴方向的情况,得到了两个沿外场方向传播的圆偏振模和它们的色散关系,1977年,E. F. Sarmento

关键词： antiferromagnet multilayer structure polariton cut-off wave vector.

Lawson Cypress Leaf-like ZnOHierarchical Nanostructures by Self-assembly

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Lawson Cypress Leaf-like ZnOHierarchical Nanostructures by S...

Influence of ZrO2 Interface on the Luminescent properties of AI2O3@Y2O3.Eu3+ core-shell structure

2014中国功能材料科技与产业高层论坛

作者： Chuan Zhao Xiaoping Zou Xueming Lv Sheng He Research Center for Sensor Technology Beijing Key Laboratory for sensorMinistry-of-Education Key Laboratory for Modern Measurement and Control TechnologySchool of Applied SciencesBeijing Information Science and Technology UniversityJianxiangqiao Campus

In this letter,Lawson cypress leaf-like ZnO hierarchical nanostructures with new and interesting morphology were synthesized by electrodeposition in aqueoussolution of Zn(NO) followed by annealing process,this structure was the first time appearing in ZnO nanostructure.The obtained Lawson cypress leaf-like ZnO hierarchical nanostructures were composed ofZnO nanoparticles with the grain size about10000 nm,were observed by scanning electron microscope(SEM),ZnO was detected by X-ray diffrac-tion(XRD),and the highly crystalline structure was demonstrated by high-resolution transmission electron microscopy(HRTEM).Lawson cypress leaf-like ZnO hierarchicalnanostructures,whichare well-controlled in diameter,space and thickness,have potential applications in photoelectronicdevices,sensors,solar cells and nanometer devices.

关键词： Crystal structure multilayer structure Electrodeposition Nanocrystalline materials

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Influence of ZrO2 Interface on the Luminescent properties of...