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Multifunctional phase change film with high recyclability, adjustable thermal responsiveness, and intrinsic self-healing ability for thermal energy storage

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Journal of Energy Chemistry 2024年第10期97卷 216-227,I0005页

作者： Bo Yang Xuelai Zhang Jun Ji Weisan Hua miaomiao Jiang Institute of Cool Thermal Storage Technology Shanghai Maritime UniversityShanghai 201306China

Phase change materials(PCMs) present promising potential for guaranteeing safety in thermal management ***,most reported PCMs have a single application in energy storage for thermal management systems,which does not meet the growing demand for multi-functional *** this paper,the flexible material and hydrogen-bonding function are innovatively combined to design and prepare a novel multi-functional flexible phase change film(PPL).The 0.2PPL-2 film exhibits solid-solid phase change behavior with energy storage density of 131.8 J/g at the transition temperature of42.1℃,thermal cycling stability(500 cycles),wide-temperature range flexibility(0-60℃) and selfhealing ***,the PPL film can be recycled up to 98.5% by intrinsic ***,the PPL film can be tailored to the desired colors and configurations and can be cleverly assembled on several thermal management systems at ambient temperature through its flexibility combined with shape-memory *** interestingly,the transmittance of PPL will be altered when the ambient temperature changes(60℃),conveying a clear thermal ***,the thermal energy storage performance of the PPL film is successfully tested by human thermotherapy and electronic device temperature control *** proposed functional integration strategy provides innovative ideas to design PCMs for multifunctionality,and makes significant contributions in green chemistry,highefficiency thermal management,and energy sustainability.

关键词： Phase change film Multifunctional material Energy storage Self-healing Recyclability

Real-time Detection of Airborne Influenza A Viruses Using Silicon Nanowire Field Effect Transistor

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Real-time Detection of Airborne Influenza A Viruses Using Si...

Developmental toxicity assessment of neonicotinoids and organophosphate esters with a human embryonic stem cell-and metabolism-based fast-screening model

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作者： Fangxia Shen1 miaomiao tan1 Zhenxing Wang2 Maosheng Yao1 * Zhenqiang Xu1 Yan Wu1 Jindong Wang2 Xuefeng Guo2 * and Tong Zhu1 1 State Key Joint Laboratory for Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 China 2 College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Numerous threats from biological aerosol exposures, such as H1N1 influenza, SARS, bird flu, and bio-terrorism necessitate the development of a real-time bioaerosol sensing system, which however is a long standing challenge in the field. Here, we reported real-time detection of airborne influenza H3N2 viruses by integrating electrically addressable silicon nanowire （SiNW） sensor devices with microfluidics and a bioaerosol-to-hydrosol air sampling system. Influenza A viruses were aerosolized into exposure chamber, and collected by an automated electrostatic sampler （AES） at a sampling flow rate of 5 L/min and transported onto the SiNW sensor device via microfludic channel via a peristaltic pump at a flow rate of 0.4 L/min in a real-time manner. The electrical conductance of the SiNW device was monitored using a pre-amplifier and a lock-in amplifier. Results show that when airborne influenza H3N2 virus samples were collected and delivered to antibody-modified SiNW devices, discrete nanowire conductance changes were observed within seconds. However, the conductance levels remained relatively unchanged when indoor air or clean air samples were delivered. Quantitative polymerase chain reaction （qPCR） tests indicated that higher virus concentrations in the air samples corresponded to higher conductance levels in the SiNW devices. The sensing system here has been demonstrated to have the capability to monitor the airborne presence of influenza A viruses in a real-time manner, typically from 1 to 2 minutes. This response time scale exceeds many of those available bioaerosol sensing systems. The work here opens a new arena for real-time monitoring of biological aerosols by integrating the technologies in different disciplines, holding great promise in the combat of fighting both infectious diseases and bio-terrorism.

关键词： Influenza A H3N2 virus bioaerosol Silicon Nanowire aerosol-to-hydrosol qPCR real-time detection

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Journal of Environmental Sciences 2024年第3期137卷 370-381页

作者： Shuxian Zhang miaomiao Zhao Shichang Li Renjun Yang Nuoya Yin Francesco Faiola State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

In recent years,neonicotinoids(NEOs)and organophosphate esters(OPEs)have been widely used as substitutes for traditional pesticides and brominated fame-retardants,*** studies have shown that those compounds can be frequently detected in environmental and human samples,are able to penetrate the placental barrier,and are toxic to ***,it is reasonable to speculate that NEOs and OPEs may have potential adverse effects in humans,especially during *** employed a human embryonic stem cell differentiation-and liver S9 fraction metabolism-based fast screening model to assess the potential embryonic toxicity of those two types of *** show that four NEO and five OPE prototypes targeted mostly ectoderm specification,as neural ectoderm and neural crest genes were down-regulated,and surface ectoderm and placode markers *** liver S9 fraction's treatment could generally reduce the effects of the chemicals,except in a few specific instances,indicating the liver may detoxify NEOs and *** findings suggest that NEOs and OPEs interfere with human early embryonic development.

关键词： Neonicotinoids Organophosphate esters Human embryonic stem cells Fast screening model Developmental toxicity

Solving the subset sum problem by the quantum Ising model with variational quantum optimization based on conditional values at risk

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 43-55页

作者： Qilin Zheng miaomiao Yu Pingyu Zhu Yan Wang Weihong Luo Ping Xu Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China Hefei National Laboratory Hefei 230088China

The subset sum problem is a combinatorial optimization problem,and its complexity belongs to the nondeterministic polynomial time complete(NP-Complete)*** problem is widely used in encryption,planning or scheduling,and integer *** accurate search algorithm with polynomial time complexity has not been found,which makes it challenging to be solved on classical *** effectively solve this problem,we translate it into the quantum Ising model and solve it with a variational quantum optimization method based on conditional values at *** proposed model needs only n qubits to encode 2ndimensional search space,which can effectively save the encoding quantum *** model inherits the advantages of variational quantum algorithms and can obtain good performance at shallow circuit depths while being robust to noise,and it is convenient to be deployed in the Noisy Intermediate Scale Quantum *** investigate the effects of the scalability,the variational ansatz type,the variational depth,and noise on the ***,we also discuss the performance of the model under different conditional values at *** computer simulation,the scale can reach more than nine *** selecting the noise type,we construct simulators with different QVs and study the performance of the model with *** addition,we deploy the model on a superconducting quantum computer of the Origin Quantum Technology Company and successfully solve the subset sum *** model provides a new perspective for solving the subset sum problem.

关键词： subset sum problem quantum Ising model conditional values at risk variational quantum optimization

Bilinear Strongly Singular Calderón-Zygmund Operators and Their Commutators on Non-Homogeneous Generalized Morrey Spaces

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Journal of Mathematical Research with Applications 2024年第1期44卷 43-62页

作者： Guanghui LU miaomiao WANG College of Mathematics and Statistics Northwest Normal University

The main goal of this paper is to establish the boundedness of bilinear strongly singular operator■ and its commutator■b1,b2on generalized Morrey spaces Mpu(μ) over nonhomogeneous metric measure *** assumption that the Lebesgue measurable functions u,u1and u2belong to Wτfor τ∈(0,2),and u1u2=*** authors prove that■ is bounded from product spaces Mp1u1(μ)×Mp2u2(μ) into spaces Mpu(μ),where 1/p=1/p1+1/p2with 11,p21u1(μ)×Mp2u2(μ) into generalized weak Morrey spaces W Mpu(μ).Furthermore,the author also show that commutator■b1,b2generated by b1,b2∈■ and ■ is bounded from product spaces Mp1u1(μ)×Mp2u2(μ) into spaces Mpu(μ).

关键词： non-homogeneous metric measure space bilinear strongly singular Calderon-Zygmund operator commutator space RBMO(μ) generalized Morrey space

The quantum Ising model for perfect matching and solving it with variational quantum eigensolver

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Science China(Information Sciences) 2024年第9期67卷 306-320页

作者： Qilin ZHENG Pingyu ZHU Chao WU miaomiao YU Weihong LUO Ping XU Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Hefei National Laboratory

Obtaining all perfect matchings of a graph is a tough problem in graph theory, and its complexity belongs to the #P-Complete class. The problem is closely related to combinatorics, marriage matching problems, dense subgraphs, the Gaussian boson sampling, chemical molecular structures, and dimer *** this paper, we propose a quadratic unconstrained binary optimization formula of the perfect matching problem and translate it into the quantum Ising model. We can obtain all perfect matchings by mapping them to the ground state of the quantum Ising Hamiltonian and solving it with the variational quantum eigensolver. Adjusting the model's parameters can also achieve the maximum or minimum weighted perfect matching. The experimental results on a superconducting quantum computer of the Origin Quantum Computing Technology Company show that our model can encode 2~n dimensional optimization space with only O（n） qubits consumption and achieve a high success probability of the ground state corresponding to all perfect matchings. In addition, the further simulation results show that the model can support a scale of more than 14 qubits, effectively resist the adverse effects of noise, and obtain a high success probability at a shallow variational depth. This method can be extended to other combinatorial optimization problems.

关键词： perfect matching Ising model quantum Hamiltonian variational quantum eigensolver quadratic unconstrained binary optimization

The Effects of the Geometry of a Current Collector with an Equal Open Ratio on Output Power of a Direct Methanol Fuel Cell

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Energy Engineering 2024年第5期121卷 1161-1172页

作者： Yingli Zhu Jiachi Xie Mingwei Zhu Jun Zhang miaomiao Li Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry&Food Machinery and Equipment School of Mechanical EngineeringTianjin University of Science&TechnologyTianjin300222China Tianjin College University of Science and Technology BeijingTianjin301830China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China

The open ratio of a current collector has a great impact on direct methanol fuel cell(DMFC)*** a number of studies have investigated the influence of the open ratio of DMFC current collectors,far too little attention has been given to how geometry(including the shape and feature size of the flow field)affects a current collector with an equal open *** this paper,perforated and parallel current collectors with an equal open ratio of 50%and different feature sizes are designed,and the corresponding experimental results are shown to explain the geometry effects on the output power of the *** results indicate that the optimal feature sizes are between 2 and 2.5 mm for both perforated and parallel flow field in the current collectors with an equal open ratio of 50%.This means that for passive methanol fuel cells,to achieve the highest output power,the optimal feature size of the flow field in both anode and cathode current collectors is between 2 and 2.5 mm under the operating mode of this *** effects of rib and channel position are also investigated,and the results indicate that the optimum pattern depends on the feature sizes of the flow field.

关键词： Direct methanol fuel cell geometry open ratio current collector position

Nano-alumina@cellulose-coated separators with the reinforcedconcrete-like structure for high-safety lithium-ion batteries

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Chinese Journal of Chemical Engineering 2024年第4期68卷 83-93页

作者： Zhihao Yang Li Chen Jian Xue miaomiao Su Fangdan Zhang Liangxin Ding Suqing Wang Haihui Wang Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Separators play a critical role in the safety and performance of lithium-ion ***,commercial polyolefin separators are limited by their poor affinity with electrolytes and low melting *** this work,we constructed a reinforced-concrete-like structure by homogeneously dispersing nano-Al_(2)O_(3) and cellulose on the separators to improve their stability and *** this reinforcedconcrete-like structure,the cellulose is a reinforcing mesh,and the nano-Al_(2)O_(3) acts as concrete to support the *** constructing the reinforced-concrete-like structure,the separators exhibit good stability even at 200℃(thermal shrinkage of 0.3%),enhanced tensile strain(tensile stress of 133.4 MPa and tensile strains of 62%),and better electrolyte wettability(a contact angle of 6.5°).Combining these advantages,the cells with nano-Al_(2)O_(3)@cellulose-coated separators exhibit stable cycling performance and good rate ***,the construction of the reinforced-concretelike structure is a promising technology to promote the application of lithium-ion batteries in extreme environments.

关键词： Alumina Nanomaterials Lithium-ion batteries Membranes Cellulose Reinforced-concrete-like structure

Heterostructured Co_(3)Se_(4)/CoSe_(2)@C nanoparticles attached on three-dimensional reduced graphene oxide as a promising anode towards Li-ion batteries

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Frontiers of Materials Science 2024年第2期18卷 101-115页

作者： Mingjun Pang Zhaoyang Song miaomiao Mao Shang Jiang Ruxia Zhang Runwei Wang Jianguo Zhao Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education Shanxi Datong UniversityDatong 037009China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

In situ carbon-coated Co_(3)Se_(4)/CoSe_(2)(Co_(x)Se_(y))nanoparticles(NPs)attached on three-dimensional(3D)reduced graphene oxide(rGO)sheets were skillfully developed in this work,which involved the environment-friendly hydrothermal method,freeze drying,and selenide *** the structure,the glucose-derived carbon layer exhibited significantly homogeneous dispersion under an argon *** structure not only has enhanced stability,but also can effectively mitigate the volume swell of Co_(x)Se_(y) *** resulted Co_(3)Sea/CoSe_(2)@C/rGO(CSe@C/rGO)exhibited a specific surface area(SSA)of 240.9 m^(2)·g^(-1),offering more electrochemically active sites for the storage of energy related to lithium *** rGO matrix held exceptional flexibility and functional structural rigidity,facilitating the swift ion intercalation and ensuring the high conductivity and recyclability of the *** applied to anodes designed for lithium-ion batteries(LiBs),this material demonstrated distinguished rate and ultra-high reversible capacity(872.98 mA·h·g^(-1) at 0.5 A·g^(-1)).Meanwhile,its capacity retention reached 119.5%after 500 cycles at 2 A·g^(-1),with a coulombic efficiency of 100%.This work potentially paves the way for generating fast and powerful metal selenide anodes and initiating LiBs with good performance.

关键词： CSe@C/rGO lithium-ion battery reduced graphene oxide electrochemicalperformance heterostructure