检索结果-南通市图书馆

Nano-Micro Letters 2024年第2期16卷 423-437页

作者： Lin Tang Kunpeng Ruan Xi Liu Yusheng Tang Yali Zhang Junwei Gu Chongqing Key Laboratory of Green Synthesis and Applications College of ChemistryChongqing Normal UniversityChongqing 401331People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of 5G information technology,thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming *** this work,“high-temperature solid-phase&diazonium salt decomposition”method is carried out to prepare benzidine-functionalized boron nitride(m-BN).Subsequently,m-BN/poly(pphenylene benzobisoxazole)nanofiber(PNF)nanocomposite paper with nacremimetic layered structures is prepared via sol–gel film transformation *** obtained m-BN/PNF nanocomposite paper with 50 wt%m-BN presents excellent thermal conductivity,incredible electrical insulation,outstanding mechanical properties and thermal stability,due to the construction of extensive hydrogen bonds andπ–πinteractions between m-BN and PNF,and stable nacre-mimetic layered ***λ∥andλ_(⊥)are 9.68 and 0.84 W m^(-1)K^(-1),and the volume resistivity and breakdown strength are as high as 2.3×10^(15)Ωcm and 324.2 kV mm^(-1),***,it also presents extremely high tensile strength of 193.6 MPa and thermal decomposition temperature of 640°C,showing a broad application prospect in high-end thermal management fields such as electronic devices and electrical equipment.

关键词： Poly(p-phenylene-2,6-benzobisoxazole)nanofiber boron nitride Thermal conductivity Electrical insulation

3D-printable boron nitride/Polyacrylic Hydrogel Composites with High Thermal Conductivities

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1303-1310页

作者： DAI Jialei XUE Bingyu QIAN Qi HE Wenhao ZHU Chenglong LEI Liwen WANG Kun XIE Jingjing Hubei Longzhong Laboratory Xiangyang 441000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Polyacrylic acid(PAA)hydrogel composites with different hexagonal boron nitride(h-BN)fillers were synthesized and successfully 3D-printed while their thermal conductivity was systematically *** the content of h-BN increasing from 0.1 wt%to 0.3 wt%,the thermal conductivity of the 3D-printed composites has been ***,through the shear force given by the 3D printer,a complete thermal conductivity path is obtained inside the hydrogel,which significantly improves the thermal conductivity of the h-BN hydrogel *** maximum thermal conductivity is 0.8808 W/(m·K),leading to a thermal conductive enhancement of 1000%,compared with the thermal conductivity of pure PAA *** study shows that using h-BN fillers can effectively and significantly improve the thermal conductivity of hydrogelbased materials while its 3D-printable ability has been maintained.

关键词： hydrogel composites boron nitride 3D printing thermal conductivity

boron nitride/agarose hydrogel composites with high thermal conductivities

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第4期39卷 375-382页

作者： Ali Yazdan Ji-Zhe Wang Bing-Kun Hu Wen-Sheng Xie Ling-Yun Zhao Ce-Wen Nan Liang-Liang Li State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Engineering Research Center of Nano-Geo Materials of Ministry of Education China University of GeosciencesWuhan 430074China

Hydrogels are cross-linked polymers suitable for various applications,but the thermal conductivities of hydrogel-based composites have not been thoroughly *** this study,agarose hydrogel-based composites with various boron nitride(BN)fillers were synthesized and their thermal conductivities were systematically *** the increase in the agarose content from 1.5 wt%to 3.0 wt%,the thermal conductivity of the composite *** composites with BN micropowder had larger thermal conductivities than those of the composites with BN nanopowder at the same filler loading,as the BN micropowder provided better thermal conduction pathways in the hydrogel matrix than those provided by the *** maximum thermal conductivity of 2.69 W m-1·K-1 was achieved when 15 wt%microscale BN fillers were added into 1.5 wt%agarose hydrogel,which was 3.5 times larger than that of the pure agarose ***,a theoretical model was used to calculate the thermal conductivities of the BN/agarose hydrogel composites;a good agreement was achieved between the experimental and fitting *** study demonstrated that the thermal conductivities of hydrogel-based materials can be efficiently and significantly enhanced using BN fillers.

关键词： Hydrogel boron nitride Thermal conductivity Composite

boron nitride for enhanced oxidative dehydrogenation of ethylbenzene

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第6期30卷 477-484,I0012页

作者： Rui Han Jiangyong Diao Sonu Kumar Andrey Lyalin Tetsuya Taketsugu Gilberto Casillas Christopher Richardson Feng Liu Chang Won Yoon Hongyang Liu Xudong Sun Zhenguo Huang Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Civil and Environmental Engineering University of Technology SydneyUltimoNew South Wales 2007Australia Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Institute for Chemical Reaction Design and Discovery(WPI-ICReDD) Hokkaido UniversitySapporo 001-0021Japan Center for Green Research on Energy and Environmental Materials National Institute for Materials Science(NIMS)Tsukuba 305-0044Japan Department of Chemistry Faculty of ScienceHokkaido UniversitySapporo 060-0810Japan Electron Microscopy Centre University of WollongongNew South Wales 2500Australia Molecular Horizons and School of Chemistry and Molecular Bioscience Faculty of ScienceMedicine and HealthUniversity of WollongongNew South Wales 2522Australia Center for Hydrogen and Fuel Cell Research Korea Institute of Science and TechnologySeoul 02792Republic of Korea

It is demonstrated experimentally and confirmed theoretically that highly defective boron nitride showed outstanding performance for oxidative dehydrogenation of *** catalyst is derived from carbon-doped hexagonal boron nitride nanosheets synthesized via a two-step reaction when participating the oxidative dehydrogenation *** first step yields a polymeric precursor with the atomic positions of B,C,N relatively constrained,which is conducive for the formation of carbon atomic clusters uniformly dispersed throughout the BN *** the oxidative dehydrogenation of ethylbenzene to styrene,the nanoscale carbon clusters are removed and highly defective boron nitride(D-BN)is obtained,exposing boron-rich zigzag edges of BN that act as the catalytic *** catalytic performance of D-BN is therefore remarkably better than un-doped *** results indicate that dispersed C-doping in h-BN is highly effective in terms of defect formation and resultant enhanced activity in oxidative dehydrogenation reactions.

关键词： boron nitride Dehydrogenation Ethylbenzene Carbon-doping Heterogeneous catalysis

boron nitride-based electrocatalysts for HER,OER,and ORR:A mini-review

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2021年第4期15卷 543-552页

作者： Nabi ULLAH Rizwan ULLAH Saraf KHAN Yuanguo XU School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China National Centre of Excellence in Physical Chemistry University of PeshawarPeshawar25120Pakistan Institute of Chemical Sciences University of PeshawarKhyber Pakhtunkhwa25120Pakistan

A reliable and efficient solution to the current energy crisis and its associated environmental issues is provided by fuel cells,metal-air batteries and overall water *** heart reactions for these technologies are oxygen reduction reaction(ORR),oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).Different supporters such as graphene,carbon nanotube,and graphitic carbon nitride have been used to avoid agglomeration of active materials and provide maximum active surface for these *** all the supporters,boron nitride(BN)gains extensive research attention due to its analogue with graphene and excellent stability with good oxidation and chemical *** this mini-review,the well-known strategies(exfoliation,annealing,and CVD)used in the synthesis of BN with different morphologies for HER,OER and ORR applications have been briefly debated and *** comparative analysis determines that the performance and stability of state-of-the-art electrocatalysts can be further boosted if they are deposited on *** is revealed that BN-based catalysts for HER,OER and ORR are rarely studied yet especially with non-noble transition metals,and this research direction should be studied deeply in future for practical applications.

关键词： boron nitride electrocatalyst hydrogen evolution reaction oxygen evolution reaction oxygen reduction reaction

A viewpoint on catalytic origin of boron nitride in oxidative dehydrogenation of light alkanes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2018年第5期39卷 908-913页

作者： Lei Shi Dongqi Wang An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina Center for Multi-disciplinary Research Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Oxidative dehydrogenation of light alkanes to alkenes is an attractive alternative route for industrial direct dehydrogenation because of favorable thermodynamic and kinetic characteristics,but encounters difficulties in selectivity control for alkenes because of over-oxidation reactions that produce a substantial amount of undesired carbon *** progress has revealed that boron nitride is a highly promising catalyst in the oxidative dehydrogenation of light alkanes because of its superior selectivity for and high productivity of light alkenes,negligible formation of CO2,and remarkable catalyst *** this viewpoint,recent works on boron nitride in the oxidative dehydrogenations of ethane,propane,butane,and ethylbenzene are reviewed,and the emphasis of this viewpoint is placed on discussing the catalytic origin of boron nitride in oxidative dehydrogenation *** analyzing recent progress in the use of boron nitride for oxidative dehydrogenation reactions and finding much new evidence,we conclude that pure boron nitride is catalytically inert,and an activation period is required under the reaction conditions;this process is accompanied by an oxygen functionalization at the edge of boron nitride;the B-O species themselves have no catalytic activity in C-H cleavage,and the B-OH groups,with the assistance of molecular oxygen,play the key role in triggering the oxidative dehydrogenation of propane;the dissociative adsorption of molecular oxygen is involved in the reaction process;and a straightforward strategy for preparing an active boron nitride catalyst with hydroxyl groups at the edges can efficiently enhance the catalytic efficacy.A new redox reaction cycle based on the B-OH sites is also ***,as this is a novel catalytic system,there is an urgent need to develop new methods to optimize the catalytic performances,clarify the catalytic function of boron species in the alkane ODH reactions,and disclose the reaction mechanism u

关键词： boron nitride Zig-zag edge B-OH group Light alkanes Oxidative dehydrogenation Induction period

Selective oxidative dehydrogenation of ethane to ethylene over a hydroxylated boron nitride catalyst

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2017年第2期38卷 389-395页

作者：石磊闫冰邵丹姜凡王东琪陆安慧大连理工大学化化工学院精细化工国家重点实验室辽宁大连116024 中国科学院高能物理研究所多学科研究中心北京100049

boron nitride containing hydroxyl groups efficiently catalysed oxidative dehydrogenation of ethane to ethylene,offering rather high selectivity（95%） but only small amount of CO2 formation（0.4%） at a given ethane conversion of 11%.Even at high conversion level of 63%,the selectivity of ethylene retained at 80%,which is competitive with the energy-demanding industrialized steam cracking route.A long-term test for 200 h resulted in stable conversion and product selectivity,showing the excellent catalytic *** experimental and computational studies have identified that the hydrogen abstraction of B-OH groups by molecular oxygen dynamically generated the active sites and triggered ethane dehydrogenation.

关键词： boron nitride Hydroxylation Ethane Oxidative dehydrogenation Ethylene

Electronic interaction between single Pt atom and vacancies on boron nitride nanosheets and its influence on the catalytic performance in the direct dehydrogenation of propane

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2019年第6期40卷 819-825页

作者： Xiaoying Sun Meijun Liu Yaoyao Huang Bo Li Zhen Zhao Institute of Catalysis for Energy and Environment College of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang 110034LiaoningChina State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The electronic metal-support interaction(EMSI)is one of most intriguing phenomena in heterogeneous *** this work,this subtle effect is clearly demonstrated by density functional theory(DFT)calculations of single Pt atom supported on vacancies in a boron nitride ***,the relation between the EMSI and the performance of Pt in propane direct dehydrogenation(PDH)is investigated in *** charge state and partial density of states of single Pt atom show distinct features at different anchoring positions,such as boron and nitrogen vacancies(Bvac and Nvac,respectively).Single Pt atom become positively and negatively charged on Bvac and Nvac,***,the electronic structure of Pt can be adjusted by rational deposition on the ***,Pt atoms in different charge states have been shown to have different catalytic abilities in *** DFT calculations reveal that Pt atoms on Bvac(Pt-Bvac)have much higher reactivity towards reactant/product adsorption and C–H bond activation than Pt supported on Nvac(Pt-Nvac),with larger adsorption energy and lower barrier along the reaction ***,the high reactivity of Pt-Bvac also hinders propene desorption,which could lead to unwanted deep ***,the results obtained herein suggest that a balanced reactivity for C–H activation in propane and propene desorption is required to achieve optimum *** on this descriptor,a single Pt atom on a nitrogen vacancy is considered an effective catalyst for ***,the deep dehydrogenation of the formed propene is significantly suppressed,owing to the large barrier on *** current work demonstrates that the catalytic properties of supported single Pt atoms can be tuned by rationally depositing them on a boron nitride nanosheet and highlights the great potential of single-atom catalysis in the PDH reaction.

关键词： Propane Direct dehydrogenation Platinum boron nitride Single atom catalysis Density functional theory Electronic metel-support interaction

Hexagonal boron nitride/poly(vinyl butyral)composite coatings for corrosion protection of copper

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第1期96卷 103-112页

作者： Jing Wang Ning Wang Mengnan Liu Chengyue Ge Baorong Hou Guichang Liu Wen Sun Yiteng Hu Yanli Ning CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesNo.7 Nanhai RoadQingdao 266071China Department of Chemical Engineering School of Chemical EngineeringDalian University of TechnologyNo.2 Linggong RoadDalian 116024China Open Studio for Marine Corrosion and Protection Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesNo.7 Nanhai RoadQingdao 266071China

Hexagonal boron nitride(h-BN)fillers are incorporated into poly(vinyl butyral)(PVB)coatings to improve the corrosion protection performance of *** has been revealed that the h-BN fillers exhibit an excellent dispersiblility in PVB coating due to the non-covalent interactions between h-BN fillers and the PVB *** characterization reveals that the corrosion resistance of the BN-reinforced PVB(BN-P)coating is 5-6 orders of magnitude higher than that of the pristine PVB *** and metallography show that the copper substrate beneath the BN-P coating does not suffer from corrosion after immersion for 2 months,indicating that the BN-P coating can provide a long-term protective barrier for the underlying copper *** 0-0.25 g h-BN fillers in 2.0 g PVB,the corrosion protection performance increases with increasing the loading of h-BN *** scratch test results suggest that h-BN fillers do not accelerate copper corrosion when the BN-P coating is damaged.

关键词： Copper boron nitride TEM EIS Polymer coatings

Reaction between Ti and boron nitride based investment shell molds used for casting titanium alloys

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第6期27卷 617-622页

作者： LILT Hongbao SHEN Bin ZHU Ming ZHOU Xing MAO Xiemin School of Materials Science and Engineering Shanghai University Shanghai 200072 China General Research Institute for Nonferrous Metals Beijing 100088 China

The aim of this paper was to study the reaction between a Ti-6Al-4V alloy and boron nitride based investment shell molds used for investment casting titanium. In BN based investment shell molds, the face coatings are made of pretreated hexagonal boron nitride （hBN） with a few yttria （Y2O3） and colloidal yttria as binder. The Ti-6Al-4V alloy was melted in a controlled atmosphere induction furnace with a segment water-cooled copper crucible. The cross-section of reaction interface between Ti alloys and shell mold was investigated by electron probe micro-analyzer （EPMA） and microhardness tester. The results show that the reaction is not serious, the thickness of the reacting layer is about 30-50 μm, and the thickness of α-case is about 180-200 pro. Moreover the α-case formation mechanism was also discussed.

关键词： boron nitride shell mold titanium alloy interface reaction investment casting