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Preparation and Properties of Paraffin/PMMA Shape-stabilized Phase Change Material for Building Thermal Energy Storage

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 231-239页

作者：孟多 ZHAO Kang wang Anqi wang baomin School of Civil and Architectural Engineering Liaoning University of TechnologyJinzhou 121001China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 10083China Institute of Building Materials Dalian University of TechnologyDalian 116024China

The composite phase change material(PCM) consisting of phase change paraffin(PCP) and polymethyl methacrylate(PMMA) was prepared as a novel type of shape-stabilized PCM for building energy conservation through the method of bulk polymerization. The chemical structure, morphology, phase change temperature and enthalpy, and mechanical properties of the composite PCM were studied to evaluate the encapsulation effect of PMMA on PCP and determine the optimal composition proportion. FTIR and SEM results revealed that PCP was physically immobilized in the PMMA so that its leakage from the composite was prevented. Based on the thermo-physical and mechanical properties investigations, the optimal mass fraction of PCP in the composite was determined as 70%. The phase change temperature of the composite was close to that of PCP, and its latent heat was equivalent to the calculated value according to the mass fraction of PCP in the composite. For estimating the usability in practical engineering, thermal stability, reliability and temperature regulation performance of the composite were also researched by TG analysis, thermal cycling treatments and heating-cooling test. The results indicated that PCP/PMMA composite PCM behaved good thermal stability depending on the PMMA protection and its latent heat degraded little after 500 thermal cycling. Temperature regulation performance of the composite before and after thermal cycling was both noticeable due to its latent heat absorption and release in the temperature variation processes. The PCP/PMMA phase change plate was fabricated and applied as thermal insulator in miniature concrete box to estimate its temperature regulation effect under the simulated environmental condition. It can be concluded that this kind of PCP/PMMA shape-stabilized PCM with the advantages of no leakage, suitable phase change temperature and enthalpy, good thermal stability and reliability, and effective temperature regulation performance have much potentia

关键词： shape-stabilized phase change material phase change paraffin polymethyl methacrylate temperature regulation building energy conservation

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Analysis on Pore Structure of Non-Dispersible Underwater Concrete in Saline Soil Area

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Journal of Renewable Materials 2021年第4期9卷 723-742页

作者： Fang Liu baomin wang Mengsai wang Xiaosa Yuan Shaanxi Key Laboratory of Safety and Durability of Concrete Structures Xijing UniversityXi’an710123China School of Civil Engineering Dalian University of TechnologyDalian116023China

In this paper,mercury intrusion porosimetry(MIP)is used to test the pore structure of non-dispersible underwater concrete so as to study the influence of pouring and curing environment,age and slag powder on the pore characteristics of concrete,analyze the pore characteristics,porosity and pore distribution of concrete in different hydration stages,and reveal the relationship between pore structure and permeability of *** results show that the pore-size distribution of concrete in fresh water condition is better than that in sulfate environment and mixed salt environment,and therefore,sulfate as well as mixed salt are not conducive to the development of pore structure of non-dispersible underwater concrete;chlorine salt has little effect on the pore structure of nondispersible underwater concrete;under the three conditions of sulfate,chlorine and mixed salt,the porosity of concrete mixed with slag powder is lower than that of concrete without slag *** results indicate that the addition of slag powder can ameliorate the pore size distribution of non-dispersed underwater concrete,reduce the porosity,and make the concrete structure more compact,which is beneficial to improve the permeability resistance of concrete at the macro level.

关键词： Non-dispersible underwater concrete slag powder saline soil mercury intrusion porosimetry(mip) pore structure

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Flexible magnetic thin films and devices

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Journal of Semiconductors 2018年第1期39卷 73-85页

作者： Ping Sheng baomin wang Runwei Li CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Ningbo 315201 China Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China

Flexible electronic devices are highly attractive for a variety of applications such as flexible circuit boards, solar cells, paper-like displays, and sensitive skin, due to their stretchable, biocompatible, light-weight,portable, and low cost properties. Due to magnetic devices being important parts of electronic devices, it is essential to study the magnetic properties of magnetic thin films and devices fabricated on flexible substrates. In this review, we mainly introduce the recent progress in flexible magnetic thin films and devices, including the study on the stress-dependent magnetic properties of magnetic thin films and devices, and controlling the properties of flexible magnetic films by stress-related multi-fields, and the design and fabrication of flexible magnetic devices.

关键词： flexible strain/stress magnetic anisotropy magnetic thin films/magnetic devices

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Construction of a low-valent thiolate-bridged dicobalt platform and its reactivity toward hydrogen activation and evolution

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Chinese Chemical Letters 2022年第5期33卷 2477-2480页

作者： Tao Mei Dawei Yang Linan Su baomin wang Jingping Qu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China

Low-valence transition metallic complexes have drawn longstanding attention due to their high reactivity toward catalytic transformation of various small *** these known complexes,the low-valence metal centres are commonly stabilized by neutral bulky ligands with strong electron-donating ***,low-valence bimetallic complexes supported by anionic sulfur and cyclopentadienyl ligands are still difficult to obtain in high isolated ***,we report the synthesis and characteri-zation of two scarce thiolate-bridged Co^(I)Co^(II)and Co^(I)Co^(I)complexes bearing sterically demanding ligands through two stepwise one-electron reduction ***,the Co^(I)Co^(II)complex can facilely promote the homolytic cleavage of dihydrogen across the short Co−Co metallic bond to give a Co^(II)Co III dihydride bridged complex,which is capable of serving as a competent hydrogen atom transfer ***,the anionic Co^(I)Co^(I)complex can trigger a stepwise hydrogen generation cycle involving several isolated and structurally well-characterized intermediates.

关键词： Low-valence Thiolate-bridged Cobalt Homolytic H_(2)cleavage Hydride Hydrogen evolution

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Synthesis,characterization and reactivity of thiolate-bridged cobalt-iron and ruthenium-iron complexes

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Chinese Chemical Letters 2022年第1期33卷 217-220页

作者： Chao Guo Linan Su Dawei Yang baomin wang Jingping Qu State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China State Key Laboratory of Bioreactor Engineering Shanghai Collaborative Innovation Centre for BiomanufacturingFrontiers Science Center for Materiobiology and Dynamic ChemistryEast China University of Science and TechnologyShanghai 200237China

Thiolate-bridged hetero-bimetallic complexes[Cp^(*)M(MeCN)N_(2)S_(2)FeCl][PF_(6)](2,M=Ru;3,M=Co,Cp^(*)=η^(5)-C_(5)Me_(5),N_(2)S_(2)=N,N'-dimethyl-3,6-diazanonane-1,8-dithiolate)were prepared by self-assembly of dimer[N_(2)S_(2)Fe]2 with mononuclear precursor[Cp^(*)Ru(MeCN)_(3)][PF_(6)]or[Cp^(*)Co(MeCN)_(3)][PF_(6)]_(2)in the presence of CHCl_(3)as a chloride *** 2 and 3 exhibit obviously different redox behaviors investigated by cyclic voltammetry and spin density distributions supported by DFT ***,iron-cobalt complex 3 possesses versatile reactivities that cannot be achieved for complex *** the presence of CoCp_(2),complex 3 can undergo one-electron reduction to generate a stable formally Co^(II)Fe^(II)complex[Cp^(*)CoN_(2)S_(2)FeCl](4).Besides,the terminal chloride on the iron center in 3 can be removed by dehalogenation agent AgPF_(6)or exchanged with azide to afford the corresponding complexes[Cp^(*)Co(MeCN)N_(2)S_(2)Fe(MeCN)][PF_(6)]_(2)(5)and[Cp^(*)Co(MeCN)N_(2)S_(2)Fe(N_(3))][PF_(6)](6).In addition,complexes 2,3 and 4 show distinct catalytic reactivity toward the disproportionation of hydrazine into *** results may be helpful to understand the vital role of the heterometal in some catalytic transformations promoted by heteromultinuclear complexes.

关键词： Metallic cooperativity Heterobinuclear complex Hydrazine disproportionation Metallothiolate ligand Metal-sulfur cluster

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Deposition of bio-mimicking graphene sheets with lotus leaf-like and cell-like structures on the nickel substrate

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Chinese Science Bulletin 2012年第23期57卷 3036-3039页

作者： YANG Juan YAN XlngBin wang Ying LUO baomin wang LiPing XUE QunJi State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

Bio-mimicking graphene films,deposited on textured nickel substrates,were synthesized by the following method:replicating the surface textures of the lotus leaf by polymer duplication,fabricating textured nickel substrates by electroplating on the polymer coated with a Au film,preparing bio-mimicking graphene oxide films on the nickel substrates by vacuum filtration,and electrochemical *** controlling the vacuum filtration,this replica method can not only replicate the lotus leaf structure by a graphene film,but also can achieve a novel cell-like graphene film.

关键词： bio-mimicking, graphene film ,lotus leaf-like structure ,cell-like structure

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Transgenic tobacco plants expressing synthetic Cry1Ac and Cry1Ie genes are more toxic to cotton bollworm than those containing one gene

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Chinese Science Bulletin 2008年第9期53卷 1381-1387页

作者： LIAN Yun JIA ZhiWei HE KangLai LIU Yundun SONG FuPing wang baomin wang GuoYing State Key Laboratory of Agrobiotechnology China Agricultural University Beijing 100094 China State Key Laboratory for Biology of Plant Diseases and Insect Pests institute of Plant Protection Chinese Academy of Agriculture Sciences Beijing 100094 China Institute of Crop Sciences Chinese Academy of Agricalture Sciences Beijing 100081 China

Transgenic tobacco plants carrying Cry1Ac, Cry1Ie or both genes were obtained. In the leaves of transgenic plants carrying both genes, the contents of Cry1Ac and Cry1Ie proteins were 0.173% and 0.131% of the total proteins, respectively. Cry1Ac protein content was 0.182% and Cry1Ie protein con- tent was 0.124% of the total proteins in the leaves of transgenic plants containing only one Bt gene. Fresh leaves of transgenic tobacco and wild-type plants were used for the insect bioassay against wild-type and Cry1Ac-resistant cotton bollworm (Helicoverpa armigera). The bioassay results showed that transgenic plants carrying both genes were significantly more toxic to wild-type and Cry1Ac-resistant cotton bollworm than those carrying Cry1Ac or Cry1Ie alone. This study indicates that the higher toxicity of transgenic tobacco plants carrying both genes is caused by the cooperative function of both Bt proteins, thus providing a potential way to delay the development of insect resis- tance to transgenic crops.

关键词：锕烟草中毒棉花螟蛉

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Effect of GGBS on performance deterioration of non-dispersible underwater concrete in saline soil

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Research in Cold and Arid Regions 2022年第2期14卷 120-137页

作者： Fang Liu baomin wang GuoRong Tao Tao Luo XiaoSa Yuan Shaanxi Key Laboratory of Safety and Durability of Concrete Structures Xijing UniversityXi'anShaanxi 710123China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basins China Institute of Water Resources and Hydropower ResearchBeijing 100038China School of Civil Engineering Dalian University of TechnologyDalianLiaoning 116023China

In saline soil areas,there are a large number of ions in soil or water environments,such as Cl^(-)and SO_(4)^(2-),which have strong corrosive interactions with *** study the deterioration of non-dispersible underwater concrete in sulfate,chloride,and mixed salt environments,the compressive strength and deterioration resistance coefficient of the studied concrete mixed with different amounts of ground granulated blast-furnace slag(GGBS)were analyzed in this *** the same time,the micro morphology and corrosion products distribution of the studied concrete were observed by means of SEM,plus XRD diffraction,TG-DTG and FT-IR analyses to explore the influence of corrosive solutions on the hydration products of *** also analyzed the mechanism of improving the deterioration resistance of the studied concrete by adding GGBS in a saline soil *** results show that the compressive strength of the studied concrete in a chloride environment was close to that in a fresh water environment,which means that chloride has no adverse effect on compressive *** deterioration of the studied concrete was most serious in a sulfate environment,followed by mixed salt environment,and the lowest in a chloride *** addition,by adding GGBS,the compressive strength and deterioration resistance of the studied concrete could be effectively improved.

关键词： saline soil non-dispersible underwater concrete granulated blast furnace slag deterioration resistance mechanism analysis

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Properties of Alkali-activated Yellow River Sediment-slag Composite Material

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 114-121页

作者： LI Gaonian LIU Hui Institute of Building Materials School of Civil Engineering Dalian University of Technology Yellow River Institute of Hydraulic Research

In order to consume the Yellow River sediment as much as possible and improve the longterm stability of the Yellow River, Yellow River sediment was utilized as the main raw material to produce a composite material. Ca(OH)_2 was used as alkali-activator to activate the active SiO_2 and Al_2O_3 compositions in Yellow River sediment. 10 wt% slag was added into the mixture to further improve the strength of the composites. The effect of activity rate of the Yellow River sediment and dosage of Ca(OH) _2 on the compressive strength of the Yellow River sediment-slag composite material at different curing ages was researched. XRD, SEM/EDS, light microscope and FTIR were used to further explore the products and the microstructure of the composite material. Results showed that the active ratio of sediment had a great influence on the compressive strength of specimen. In addition, the compressive strength of specimen increased with the increase of Ca(OH)_2dosage and curing age. When the dosage of Ca(OH)_2 was more than 5 wt% as well as the curing age reached 90 days, the compressive strength of the composite material could meet the engineering requirement. In the alkali-activated process, the main product was hydrated calcium silicate(C-S-H) gel, which filled up the gaps among the sediment particles and decreased the porosity of the specimen. Moreover, the CaCO_3 produced by the carbonization of the C-S-H gel and excess Ca(OH)_2 also played a role on the strength.

关键词： Yellow River sediment slag compressive strength hydrated calcium silicate(C-S-H) gel microstructure

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Development of Cementitious Materials Utilizing Alkali-activated Yellow River Silt

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Journal of Wuhan University of Technology(Materials Science) 2021年第3期36卷 364-373页

作者： wang baomin wang Wanli LIANG Xiaoxia LIU Hui HAN Junnan ZHAO Lu YANG Xingxing YAN Jifei School of Civil Engineering Dalian University of TechnologyDalian 116024China Yellow River Institute of Hydraulic Research Zhengzhou 450003China

The possibility of preparing cementitious materials by the alkali-activated method using Yellow River sediment(The second largest river in China)as raw material and the modification effect on different slag addition were *** silicate and calcium hydroxide were used as the activator,and the specimens were prepared by the press molding *** hydration process,hydration products,pore characteristics,and mechanical properties were investigated using SEM/EDS,FTIR,TG/DTG,XRD,MIP,and uniaxial compressive strength experiments,*** results showed that the compressive strength of the modified yellow river silt-based cementitious material was significantly increased when the water glass dosage was 12 wt%(Ms=1.8)and the slag dosage was 40%,and its 90-day maximum compressive strength could reach 53 MPa.

关键词： yellow river silt alkali-activation blast-furnace slag compression molding

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