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Spider Web‑Inspired Graphene Skeleton‑Based High Thermal Conductivity Phase Change Nanocomposites for Battery Thermal Management

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Nano-Micro Letters 2021年第11期13卷 308-321页

作者： Ying Lin qi kang Han Wei Hua Bao Pingkai Jiang Yiu‑Wing Mai Xingyi Huang Shanghai Key Lab of Electrical Insulation and Thermal Ageing The State Key Laboratory of Metal Matrix CompositesDepartment of Polymer Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China University of Michigan‑Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic Engineering J07The University of SydneySydneyNSW 2006Australia

Phase change materials(PCMs)can be used for efficient thermal energy harvesting,which has great potential for cost-effective thermal management and energy ***,the low intrinsic thermal conductivity of polymeric PCMs is a bottleneck for fast and efficient heat ***,it is also a challenge to achieve a high thermal conductivity for phase change nanocomposites at low filler *** constructing a three-dimensional(3D)thermally conductive network within PCMs can address these problems,the anisotropy of the 3D framework usually leads to poor thermal conductivity in the direction perpendicular to the alignment of *** by the interlaced structure of spider webs in nature,this study reports a new strategy for fabricating highly thermally conductive phase change composites(sw-GS/PW)with a 3D spider web(sw)-like structured graphene skeleton(GS)by hydrothermal reaction,radial freeze-casting and vacuum impregnation in paraffin wax(PW).The results show that the sw-GS hardly affected the phase transformation behavior of PW at low ***,sw-GS/PW exhibits both high cross-plane and in-plane thermal conductivity enhancements of~1260%and~840%,respectively,at an ultra-low filler loading of 2.25 vol.%.The thermal infrared results also demonstrate that sw-GS/PW possessed promising applications in battery thermal management.

关键词： Thermal conductivity Radial freeze-casting Phase change materials 3D graphene aerogel Thermal management

Flexible,Highly Thermally Conductive and Electrically Insulating Phase Change Materials for Advanced Thermal Management of 5G Base Stations and Thermoelectric Generators

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Nano-Micro Letters 2023年第3期15卷 1-15页

作者： Ying Lin qi kang Yijie Liu Yingke Zhu Pingkai Jiang Yiu‑Wing Mai Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing Department of Polymer Science and Engineeringthe State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic Engineering J07The University of SydneySydneyNSW 2006Australia

Thermal management has become a crucial problem for high-power-density equipment and *** change materials(PCMs)have great prospects in thermal management applications because of their large capacity of heat storage and isothermal behavior during phase ***,low intrinsic thermal conductivity,ease of leakage,and lack of flexibility severely limit their *** one of these problems often comes at the expense of other performance of the *** this work,we report core–sheath structured phase change nanocomposites(PCNs)with an aligned and interconnected boron nitride nanosheet network by combining coaxial electrospinning,electrostatic spraying,and *** advanced PCN films exhibit an ultrahigh thermal conductivity of 28.3 W m^(-1)K^(-1)at a low BNNS loading(i.e.,32 wt%),which thereby endows the PCNs with high enthalpy(>101 J g^(-1)),outstanding ductility(>40%)and improved fire ***,our core–sheath strategies successfully balance the trade-off between thermal conductivity,flexibility,and phase change enthalpy of ***,the PCNs provide powerful cooling solutions on 5G base station chips and thermoelectric generators,displaying promising thermal management applications on high-power-density equipment and thermoelectric conversion devices.

关键词： Coaxial electrospinning Boron nitride nanosheets Phase change nanocomposites Thermal conductivity Thermal management

Oscillating Frequency Response of a Langasite Crystal Microbalance in Liquid Phase

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Chinese Chemical Letters 2005年第11期16卷 1547-1550页

作者： qi kang Huai Jin ZHANG Xue Yong LIU Da Zhong SHEN School of Chemistry and Chemical Engineering Shandong University Jinan 250100 State Key Laboratory of Crystal Materials Shandong University Jinan 250100

The frequency responses of a langasite crystal microbalance （LCM） in liquid phase were investigated. It was shown that the LCM possessed much stronger oscillating ability in liquid phase than that of the commonly used quartz crystal microbalance （QCM）. The frequency shifts of the LCM to the changes in mass loading, as well as viscosity and density of the liquid were measured. The LCM was applied to monitor the adsorption process of an ionic liquid film to ethanol vapor.

关键词： Piezoelectric sensor langasite crystal frequency response ionic liquid.

In Situ Observation of NaCl Crystal Growth by the Vapor Diffusion Method with a Mach–Zehnder Interferometer

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Chinese Physics Letters 2011年第10期28卷 259-262页

作者： ZHAO Jing MIAO Hong DUAN Li kang qi HE Ling-Hui Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027 National Microgravity Laboratory Institute of MechanicsChinese Academy of SciencesBeijing 100190

Vapor diffusion experiments with different thicknesses of oil barriers are observed by a real-time optical diagnostic system consisting of a Mach–Zehnder interferometer,a microscope and an image *** analysis is first employed to extract the absolute concentration evolution and supersaturation during the entire crystallization *** nucleation and crystal growth processes are then *** is found that the crystallization process can be easily classified into four stages in our experiments,according to the analysis of interferograms and the absolute concentration *** can help us understand the details of crystal *** rule of quality change of crystals with increasing thickness of oil barriers is also analyzed,and could be interpreted by the absolute concentration variation and crystallization phase diagram.

关键词： crystallization absolute Diffusion

Recent advances in anode materials for potassium-ion batteries:A review

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Nano Research 2021年第12期14卷 4442-4470页

作者： Lianbo Ma Yaohui Lv Junxiong Wu Chuan Xia qi kang Yizhou Zhang Hanfeng Liang Zhong Jin School of Materials Science and Engineering Anhui University of TechnologyMaanshan243002China Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE) Jiangsu Key Laboratory of Advanced Organic MaterialsState Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Shenzhen Research Institute of Nanjing University Shenzhen518063China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu610054China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai200240China Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials SciencesNanjing University of Information Science&TechnologyNanjing210044China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen361005China

Potassium-ion batteries(PIBs)are appealing alternatives to conventional lithium-ion batteries(LIBs)because of their wide potential window,fast ionic conductivity in the electrolyte,and reduced ***,PIBs suffer from sluggish K+reaction kinetics in electrode materials,large volume expansion of electroactive materials,and the unstable solid electrolyte *** strategies,especially in terms of electrode design,have been proposed to address these *** this review,the recent progress on advanced anode materials of PIBs is systematically discussed,ranging from the design principles,and nanoscale fabrication and engineering to the structure-performance ***,the remaining limitations,potential solutions,and possible research directions for the development of PIBs towards practical applications are *** review will provide new insights into the lab development and real-world applications of PIBs.

关键词： potassium-ion batteries anode materials nanoscale engineering electrode design

Time · Space · Architecture

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Science China(Technological Sciences) 2009年第9期52卷 2481-2485页

作者： qi kang Research Institute of Architecture, Southeast University, Nanjing 210096, China Research Institute of Architecture Southeast University Nanjing China

In the 20th century a Swiss writer wrote a book titled Time, Space and Architecture, in which he discussed the relationship between architecture and the times. Fifty years after that, this paper adopts the same title, hoping to deepen the understanding of the space-time structure in architecture and contribute to the new exploration of architectural forms.

关键词： Space Time Architecture

Research on blade tip clearance cavitation and turbulent kinetic energy characteristics of axial flow pump based on the partially-averaged Navier-Stokes model

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Journal of Hydrodynamics 2024年第1期36卷 184-201页

作者： Xiao-qi Jia Shuai-kang Zhang Zu-chao Zhu Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou310018China

To reveal the cavitation forms of tip leakage vortex(TLV)of the axial flow pump and the flow mechanism of the flow field,this research adopts the partially-averaged Navier-Stokes(PANS)model to simulate the cavitation values of an axial flow pump,followed by experimental *** experimental result shows that compared with the shear stress transport(SST)k-ωmodel,the PANS model significantly reduces the eddy viscosity of the flow field to make the vortex structure clearer and allow the turbulence scale to be more robustly *** cavitation area within the axial flow pump mainly comprises of TLV cavitation,clearance cavitation and tip leakage flows combined effect of triangular cloud cavitation *** formation and development of cavitation are accompanied by the formation and evolution of vortex,and variations in vortex structure also generate and promote the development of *** addition,an in-depth analysis of the relationship between the turbulent kinetic energy(TKE)transport equation and cavitation patterns was also conducted,finding that the regions with relatively high TKE are mainly distributed around gas/liquid boundaries with serious cavitation and evident gas-liquid *** phenomenon is mainly attributed to the combined effect of the pressure action term,stress diffusion term and TKE production term.

关键词： Cavitation axial flow pump tip leakage vortex(TLV) partially-averaged Navier-Stokes(PANS)model turbulent kinetic energy(TKE)

High sensitive piezoelectric quartz crystal liquid density sensor

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Chinese Chemical Letters 2010年第9期21卷 1129-1132页

作者： Xue Cai Zhao Jun Guo Du Rui Sheng qi kang Da Zhong Shen School of Chemistry Chemical Engineering and Material ScienceShandong Normal UniversityJinan 250014China

We report for the first time a cleavage phenomenon in the resonant peak of a piezoelectric quartz crystal(PQC) in liquid *** the presence of a strong longitudinal wave effect,an additional resonant peak appears in the conductance-frequency *** gradually increasing liquid density,the additional peak moves from low to high frequency region then *** frequency of the additional resonant peak is sensitive to the change in liquid *** frequency shift of the additional peak is linear with the liquid density in a given *** a 5 MHz PQC with a reflection distance of 16 mm for longitudinal wave,the sensitivity to liquid density is 2.61×10^6 Hz g^-1 cm^*** overlap between the primary resonant peak and the additional resonant peak causes a decrease in the intensity of the former and an increase in the intensity of the *** a combined impedance analysis method,the changes in surface mass loading,density and viscosity of the liquid were monitored simultaneously by a PQC sensor.

关键词： Piezoelectric quartz crystal Density sensor Longitudinal wave Impedance analysis

Analyzing the response of a contactless conductivity detector in capillary electrophoresis by a resonant method

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Chinese Chemical Letters 2012年第7期23卷 831-834页

作者： qi kang qing Zhang Yao Long Li Dong Dong Li Da Zhong Shen The Key Lab in Molecular and Nano-Materials Probes of the Ministry of Education of China School of ChemistryChemical Engineering and Material ScienceShandong Normal UniversityJinan 250014China

We report a resonant method to measure the wall capacitance（C_w） and solution resistance（R_S） in a capacitively coupled contactless conductivity detector（C^4D）.Under the typical operating conditions in capillary electrophoresis（I.D.50μm,O.D. 360μm,electrode length of 4 mm,electrode gap of 1 mm,frequency of 200 kHz）,the values of C_w measured in 1 and 20 mmol/L NaCl solutions are 2.8 and 32 fF,which are only 1.1%and 12%of prediction by the equation in references,*** value of R_S is less than the prediction in solutions withκ〈0.02 S/*** response current of C^4D is due to the change in C_w because the total impedance of a C^4D is composed mainly by the impedance from C_w.

关键词： Contactless conductivity detector Equivalent circuit parameter Quartz crystal resonator Resonant method