检索结果-南通市图书馆

Oleophobic modification of clay minerals to improve encapsulation ratios of shape-stabilized phase change materials: A universal method

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2021年第6期31卷 904-910页

作者： Pan Zhang Zefeng Cheng Zhang Chen yanfeng gao School of Materials Science and Engineering Shanghai University

Liquid-solid phase change materials(PCMs) show reversible storage and release of latent heat, which has attracted extensive interests in applications for thermal energy storage. However, stubborn leakage issue may cause corrosion and extra thermal resistance. The non-wettability of melted paraffin on the oleophobic surface of diatomite has been reported by authors earlier, and the result showed that the encapsulation ratio(84.5%) of diatomite@paraffin shape-stabilized PCM greatly increased. Here, in order to prove this method equally applicable to other PCMs and porous natural clay minerals, diatomite and sepiolite were oleophobically modified to encapsulate melted stearic acid and paraffin, to form shape-stabilized PCMs. The results showed that the encapsulation ratios of 67.8% and 56.6% for diatomite@stearic acid and sepiolite@paraffin were higher than that reported in the references(28.9% and 36.8%). In addition, the encapsulation ratios of diatomite-based shapestabilized PCMs can be also increased using different PCMs, such as n-octadecane and polyethylene glycol via the same approach. Therefore, this is a universal method for improving encapsulation ratios of shape-stabilized PCMs.

关键词： Shape-stabilized phase change materials Oleophobic modification Encapsulation ratios Clay minerals

Effects of thermomechanical cycling on the shape memory behavior and transformation temperatures of a Ni50.2Ti49.8 alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2008年第5期27卷 522-525页

作者： LI yanfeng MI Xujun gao Baodong TAN Ji State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Beijing 100088 China

The effects of thermomechanical cycling on the shape memory behavior and transformation temperatures of a Ni50.2Ti49.8 alloy under a constant applied stress of 300 MPa were investigated, k is believed that thermomechanical cycling induces defects such as dislocations, which evidently affect the shape memory behavior and transformation temperatures. The recovery strain decreases with increasing number of thermomechanical cycles, whereas the irreversible plastic strain increases, especially in the initial few cycles. The stored elastic strain energy has an important influence on transformation temperatures, the A5^σ decreases and the M5^σ increases with increasing number of thermomechanical cycles. The recovery strain, irreversible plastic strain, A5^σ , and M5^σ reach a saturation value after several cycles.

关键词： shape memory alloy TiNi thermomechanical cycling recovery strain transformation temperature

WOOD/PCM composite with enhanced energy storage density and anisotropic thermal conductivity

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2022年第2期32卷 190-195页

作者： Hongfei Chen Jihang Xuan Qiaoling Deng yanfeng gao School of Materials Science and Engineering Shanghai University

Phase change materials(PCMs) have great potential in energy-saving and environmental field due to their high latent *** deficiencies that restrict the application of PCMs are their poor thermal conductivity and liquid leakage after phase *** shoot these problems,a thermally-induced flexible WOOD/PCM composite with enhanced energy storage density and anisotropic thermal conductivity has been *** composite consisted of polyethylene glycol 6000(PEG6000),delignified balsa wood and boron nitride(BN).The results revealed that the melting enthalpy and freezing enthalpy of WOOD/PEG6000 composite were 209.3 J/g and214.9 J/g,which had an augment of about 8% comparing with pure *** adding 33 wt% BN to the composite,its thermal conductivity in the out-of-plane direction reached 0.96 W/(m·K),while the radial thermal conductivity was 0.36 W/(m·K).The controllable anisotropic thermal conductivity implies a good application in the environment where forced unidirectional heat dissipation is ***,the composite also shows excellent thermal induced flexibility,such as bending and compression,which is significant in reducing thermal contact resistance with substrates in *** work indicates that the prepared PCM composite has a great potential application in thermal energy storage and thermal management.

关键词： Phase change materials Nature wood structure High transformation enthalpy Anisotropic thermal conductivity Thermal induced flexibility

Constructing Built-In Electric Fields with Semiconductor Junctions and Schottky Junctions Based on Mo-MXene/Mo-Metal Sulfides for Electromagnetic Response

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第10期16卷 453-473页

作者： Xiaojun Zeng Xiao Jiang Ya Ning yanfeng gao Renchao Che School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403People's Republic of China School of Materials Science and Engineering Shanghai UniversityShanghai 200444People's Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering and TechnologyFudan UniversityShanghai 200438People's Republic of China Zhejiang Laboratory Hangzhou 311100People's Republic of China

The exploration of novel multivariate heterostructures has emerged as a pivotal strategy for developing high-performance electromagnetic wave(EMW)absorption ***,the loss mechanism in traditional heterostructures is relatively simple,guided by empirical observations,and is not *** this work,we presented a novel semiconductor-semiconductor-metal heterostructure sys-tem,Mo-MXene/Mo-metal sulfides(metal=Sn,Fe,Mn,Co,Ni,Zn,and Cu),including semiconductor junctions and Mott-Schottky *** skillfully combining these distinct functional components(Mo-MXene,MoS_(2),metal sulfides),we can engineer a multiple heterogeneous interface with superior absorption capabilities,broad effective absorption bandwidths,and ultrathin matching *** successful establishment of semiconductor-semiconductor-metal heterostructures gives rise to a built-in electric field that intensifies electron transfer,as confirmed by density functional theory,which collaborates with multiple dielectric polarization mechanisms to substantially amplify EMW *** detailed a successful synthesis of a series of Mo-MXene/Mo-metal sulfides featuring both semiconductor-semiconductor and semiconductor-metal *** achievements were most pronounced in Mo-MXene/Mo-Sn sulfide,which achieved remarkable reflection loss values of-70.6 dB at a matching thickness of only 1.885 *** cross-section calculations indicate that these MXene/Mo-metal sulfides have tremendous potential in practical military stealth *** work marks a departure from conventional component design limitations and presents a novel pathway for the creation of advanced MXene-based composites with potent EMW absorption capabilities.

关键词： Semiconductor-semiconductor-metal heterostructure Semiconductor junctions Mott-Schottky junctions Built-in electric field Electromagnetic wave absorption

Fe-Induced Electronic Transfer and Structural Evolution of Lotus Pod-Like CoNiFePx@P,N-C Heterostructure for Sustainable Oxygen Evolution

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第3期7卷 186-193页

作者： Xiaojun Zeng Qingqing Zhang Chulong Jin Hui Huang yanfeng gao Advanced Ceramic Materials Research Institute School of Materials Science and EngineeringJingdezhen Ceramic University Singapore Institute of Technology School of Materials Science and Engineering Shanghai University

Transition metal phosphides with metallic properties are a promising candidate for electrocatalytic water oxidation,and developing highly active and stable metal phosphide-based oxygen evolution reaction catalysts is still ***,we present a facile ion exchange and phosphating processes to transform intestine-like CoNiPx@P,N-C into lotus pod-like CoNiFePx@P,N-C heterostructure in which numerous P,N-codoped carboncoated CoNiFePxnanoparticles tightly anchors on the 2D carbon ***,the as-prepared CoNiFePx@P,N-C enables a core-shell structure,high specific surface area,and hierarchical pore structure,which present abundant heterointerfaces and fully exposed active ***,the incorporation of Fe can also induce electron transfer in CoNiPx@P,IM-C,thereby promoting the oxygen evolution ***,CoNiFePx@P,IM-C delivers a low overpotential of 278 mV （vs RHE） at a current density of10 mA cm-1and inherits excellent long-term stability with no observable current density decay after 30 h of chronoamperometry *** work not only highlights heteroatom induction to tune the electronic structure but also provides a facile approach for developing advanced and stable oxygen evolution reaction electrocatalysts with abundant heterointerfaces.

关键词： electronic transfer Fe exchange multi-metal phosphides OER electrocatalysts structural evolution

Preparation and optical properties of waterborne acrylic-based cool white coatings

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第31期59卷 4142-4146页

作者： Shengjun Cheng Hongjiang Liu yanfeng gao State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences School of Materials Science and Engineering Shanghai University

Cool coatings(solar reflective coatings)possess a high total solar reflectance and a high thermal emittance,and they have potential applications in building surfaces,pavements,and oil *** decreasing the accumulation of heat,these coatings can reduce the urban heat island effect to increase thermal comfort and to decrease energy consumption in hot *** this work,a cool white coating based on waterborne acrylic was *** reflectance and thermal emittance were measured using an ultravioletvisible-near-infrared spectrophotometer and the steadystate calorimetric technique,*** cool coating possessed a total solar reflectance of 0.887 and a thermal emittance of *** linear fitting results indicated that the thickness of the dry film is an important factor that affects the reflectance and that the physical limit of total solar reflectance in practical cool coatings is 0.91.A homemade device developed according to military specification MIL-E-46096C was used to measure insulation temperature differences,and an insulation temperature difference of29°C was *** above results demonstrated that the cool coating can be applied to buildings.

关键词：水性丙烯酸白涂料丙烯酸系光学性能红外分光光度计反射涂层制备城市热岛效应

Peptide drugs: a new direction in cancer immunotherapy

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2024年第3期21卷 198-203页

作者： Xinghua Sui Xiaoshuang Niu Xiuman Zhou yanfeng gao School of Pharmaceutical Sciences(Shenzhen) Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China

Cancer immunotherapy has emerged as a promising approach in cancer treatment and is considered a major advancement after surgical interventions, radiotherapy, chemotherapy, and targeted therapy. The clinical use of im... 详细信息

关键词： drugs immunotherapy cancer

First-principles calculations to study the optical/electronic properties of 2D VS2 with Z doping(Z=N,P,As,F,Cl and Br)

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2022年第2期32卷 236-241页

作者： Yuanyuan Cui Wei Fan Yujie Ren Guang Yang yanfeng gao School of Materials Science and Engineering Shanghai University East China Institute of Computing Technology

Monolayer VS2is expected to be an encouraging candidate for optoelectronic devices owing to its excellent optical/electrical *** this paper,first-principles calculations were conducted to figure out the optical/electrical performance of 2 D VS2doped with Z doping(Z=N,P,As,F,Cl and Br).The results show that there was a downward trend in formation energies when the doping element ranged from left to right and from bottom to top in the periodictable of ***2became more conductive with N,P and As doping,and transited from the semiconducting to metallic state with F,Cl and Br *** the optical properties,N,P,As and Br doping reduced the reflectivity of pristine VS2in the near-infrared region(0.6 eV-1.6 eV).Moreover,P,F,Cl and Brdoping reduced the migration energy barrier of Li atoms in VS2,which may help to design the rechargeable Li ion batteries with high rate capability.

关键词： 2D VS 2 Doping Diffusion barriers First-principles calculations Optical properties

Failure analysis of a field brittle fracture composite insulator:characterisation by Xray photoelectron spectroscopy analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2019年第2期4卷 89-96页

作者： yanfeng gao Xidong Liang Weining Bao Chao Wu Shaohua Li State Grid Jibei Electric Power Co.Ltd.Research Institute North China Electric Power Research Institute Co.LtdBeijing100045People's Republic of China Department of Electrical Engineering State Key Lab of Power SystemTsinghua UniversityBeijing100084People's Republic of China Department of Electrical and Computer Engineering University of ConnecticutStorrsConnecticut06269USA

In the present work,a field brittle fracture composite insulator was collected and examined with the purpose of obtaining a better understanding of the failure ***,the macroscopic and microscopic fractography of this fractured composite insulator was observed confirming that the classical brittle fracture morphology features appeared in this field failed composite ***,the X-ray photoelectron spectroscopy(XPS)analysis was performed on the fracture surface of the glass-fibre-reinforced polymer *** examining the XPS survey spectra and high-resolution XPS spectra for nitrogen,sulphur,silicon,calcium,aluminium,boron and carbon elements,the type of the glass fibre and the acid source responsible for this brittle fracture composite insulator were ***,the oxidation of the silicate network of glass fibre at the fracture surface was first observed,meanwhile,the oxidation of the epoxy resin matrix was also *** leaching of non-silicate constituents leading to a high-silica glass fibre was also observed;moreover,in comparison with the calcium and aluminium elements,the boron element resides in the silicate network was more preferential to be *** present work provides an insight into the brittle fracture in high voltage composite insulator from chemical properties point of view.

关键词： fracture composite insulator