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Nano Research 2020年第4期13卷 983-988页

作者： Lifei Liu Jianling Zhang Xiuniang Tan Bingxing Zhang Jinbiao Shi Xiuyan Cheng Dongxing Tan Buxing Han Lirong Zheng Fanyu Zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsCASResearch/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

To construct the heterojunctions of TiO2 with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic *** we propose the construction of TiO2/covalent organic framework(coF)heterojunction with tight connection by a supercritical co2(SC co2)method,which helps bridging the transformation paths for photo-induced charge between T i02 and *** produced T i02/coF heterojunction performs a H2 evolution of 3,962 nmol·g^-1·h^-1 under visible-light irradiation,which is-25 times higher than that of pure TiO2 and 4.5 folds higher than that of TiO2/coF synthesized by the conventional solvothermal *** study opens up new possibilities for constructing heterojunctions for solar energy utilization.

关键词： supercritical co2 covalent organic fram ework(coF) TiO2 H2 production visible light

Preliminary experimental study of a supercritical co2 power cycle test loop with a high-speed turbo-generator using R134a under similarity conditions

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Frontiers in Energy 2017年第4期11卷 452-460页

作者： Junhyun CHO Hyungki SHIN Jongjae CHO Young-Seok KANG Ho-Sang RA Chulwoo ROH Beomjoon LEE Gilbong LEE Byunghui KIM Young-Jin BAIK Thermal Energy System Laboratory Korea Institute of Energy Research 152 Gajeong-ro Yusung-gu Daejeon 34129 Republic of Korea Engine component Research Team Korea Aerospace Research Institute (KARl) 169-84 Gwahak-ro Yusung-gu Daejeon 34133 Republic of Korea InGineers 21 Saman-ro 16 Beon-gil Gimhae-si Gyeongsangnam-do 621-220 Republic of Korea

Research on applying a supercritical carbon dioxide power cycle （S-co2） to concentrating solar power （CSP） instead of a steam Rankine cycle or an air Brayton cycle has been recently conducted. An S-co2 system is suitable for CSP owing to its compactness, higher efficiency, and dry-cooling capability. At the Korea Institute of Energy Research （KIER）, to implement an S-co2 system, a 10 kWe class test loop with a turbine- alternator-compressor （TAC） using gas foil bearings was developed. A basic sub-kWe class test loop with a high- speed radial type turbo-generator and a test loop with a capability of tens of kWe with an axial type turbo- generator were then developed. To solve the technical bottleneck of S-co2 turbomachinery, a partial admission nozzle and oil-lubrication bearings were used in the turbo- generators. To experience the closed-power cycle and develop an operational strategy of S-co2 operated at high pressure, an organic Rankine cycle （ORC） operating test using a refrigerant as the working fluid was conducted owing to its operational capability at relatively low- pressure conditions of approximately 30 to 40 bar. By operating the sub-kWe class test loop using R134a as the working fluid instead of co2, an average turbine power of 400 W was obtained.

关键词： supercritical co2 power cycle turbomachin-ery compressor turbine

Polydimethylsiloxane assisted supercritical co2 foaming behavior of high melt strength polypropylene grafted with styrene

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Frontiers of Chemical Science and Engineering 2016年第3期10卷 396-404页

作者： Weixia Wang Shuai Zhou Zhong Xin Yaoqi Shi Shicheng Zhao Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Catalysis Technology for Polyolefin Shanghai Research Institute of Chemical Industry Shanghai 200062 China

Foamable high melt strength polypropylene （HMSPP） was prepared by grafting styrene （St） onto polypropylene （PP） and simultaneously introducing poly- dimethylsiloxane （PDMS） through a one-step melt extru- sion process. The effect of PDMS viscosity on the foaming behavior of HMSPP was systematically investigated using supercritical co2 as the foaming agent. The results show that the addition of PDMS has little effect on the grafting reaction of St and HMSPP exhibits enhanced elastic response and obvious strain hardening effect. Though the co2 solubility of HMSPP with PDMS （PDMS-HMSPP） is lower than that of HMSPP without PDMS, especially for PDMS with low viscosity, the PDMS-HMSPP foams exhibit narrow cell size distribution and high cell density. The fracture morphology of PDMS-HMSPP shows that PDMS with low viscosity disperses more easily and uniformly in HMSPP matrix, leading to form small domains during the extrusion process. These small domains act as bubble nucleation sites and thus may be responsible for the improved foaming performance of HMSPP.

关键词： high melt strength polypropylene (HMSPP),polydimethylsiloxane (PDMS) supercritical co2 foaming behavior

Pine Needle-like Nanocomposite： supercritical co2 Assisted Polythiophene Synthesis on Carbon Nanotubes

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Chemical Research in Chinese Universities 2014年第3期30卷 521-526页

作者： LU Leilei CHEN Zhimin XU Guiheng ZHANG Jianan XU Qun college of Material Science and Engineering Zhengzhou University Zhengzhou 450052 P. R. China

A facile method was succcssfidly developed to prepare a ＂pine needle-like＂ nanocompositc of carbon nanotubcs/polylhiophenc（CNTs/PTh） in ethanol with the assistance of supercritical co2（SC co2）. The experiment conditions such as mass ratio of thiophene monomer to carbon nanotubes, reaction temperature, and reaction time wcrc optimized, and the morphology and thickness of PTh layers on CNTs were hence effectively controlled. The results of Fourier translbrm infrared（FTIR） spectra, X-ray photoelectron spectra（XPS） and Raman spectra indicate the π-π interactions between PTh and CNT. A possible formation mechanism about the unique microstructure was suggested by virtue of the morphological evolution of the nanocomposite. As a facile, environment benign, and adjustable method, the proposed method holds great potential in the preparation of functional hybrid nanocomposites with the help of SC co2, which will be promising in the tields of nanofabrication and electrochemical device preparation.

关键词： Carbon nanotube Polythiophene supercritical co2 Nanocomposite

Effects of Various Factors on the Modification of Carbon Nanotubes with Polyvinyl Alcohol in supercritical co2 and Their Application in Electrospun Fibers

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Chemical Research in Chinese Universities 2014年第4期30卷 690-697页

作者： CHEN Zhimin ZHANG Jianan GUO Yuanlong ZHANG Hao CAO Jingjing XU Qun WANG Shuxia WANG Bo LIU Zhaotie college of Material Science and Engineering Zhengzhou University Zhengzhou 450001 P. R. China Key Laboratory of Applied Surface and colloid Chemistry Ministry of Education Shaanxi Normal University Xi 'an 710062 P. R. China

supercritical（SC） co2 anti-solvent induced polymer epitaxy（SAIPE） method was used to help prepare nanohybrid carbon nanotubes（CNTs） wrapped with polyvinyl alcohol（PVA） *** the variation of a series of experimental conditions or peripheral effects,such as PVA concentration,CNTs concentration,and SC co2 pressure,the optimal experimental variables for PVA-nanocrystals growing on CNTs have been *** adsorption of polymer on CNTs via multiple weak molecular interactions has been studied by Fourier transform infrared（FTIR） spectroscopy and Raman *** mechanism about the formation of PVA nanocrystals on CNTs can be suggested through the experimental *** CNTs wrapped with PVA nanocrystals can be directly used as nanofillers to fabricate PVA composite fibers reinforced with CNTs by electrospinning.

关键词： Carbon nanotube supercritical co2 Polyvinyl alcohol Electrospinning

Oxidation of n-Butanol and 2-Pentanol with Molecular Oxygen in supercritical co2

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Chinese Chemical Letters 2003年第10期14卷 1070-1072页

作者： Yan Hong CHANG, Tao JIANG, Liang GAO, Quo Ying ZHAO, Hai Xiang GAO, Zhong Hao LI, Jun Chun LI, Zhi Min Liu, Bu Xing HANCenter for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences,Beijing 100080 Center for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Oxidation of n-butanol and 2-pentanol using molecular oxygen in supercritical (SC) co2 with and without co-solvent is investigated. The results showed that the reaction selectivity is high when the reaction is carried out in SC co2. It has been observed that co-solvent affects conversion and selectivity of the reaction considerably.

关键词： Oxidation,n-butanol 2-pentanol supercritical co2 co-solvent.

Novel electric conductive polylactide/carbon nanotubes foams prepared by supercritical co2

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Progress in Natural Science:Materials International 2013年第4期23卷 395-401页

作者： Ting He Xia Liao Yunchuan He Guangxian Li college of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University

In this paper,novel electric conductive polylactide/carbon nanotubes(PLA/CNTs) foams were fabricated by a pressure-quench process using supercritical co2as a blowing *** morphology of PLA/CNTs nanocomposites prepared by solution blending was characterized using SEM and the results indicate that CNTs well dispersed in PLA *** introduction of CNTs improved the thermal stability of *** morphology and electrical properties of PLA/CNTs foams were characterized and *** on the process parameters,such as saturation temperature and pressure,nanocellular or microcellular structure of PLA/CNTs nanocomposites were *** volume resistivity of PLA/CNTs foams was from 0.53 103Ω cm to 15.13 103Ω cm,which was affected by cell structure and crystallization of foams *** reduced the electrical conductivity due to the decrease of CNTs volume content and the break of conductive ***,crystallization increased the electrical conductivity possibly because of the CNTs structural change in which the CNTs were less curled and more connected.

关键词： supercritical co2 Polylactide Multiwall carbon nanotubes Electric conductive foam Nanocomposite

supercritical co2-induced room-temperature ferromagnetism in two-dimensional MoO3−x

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Industrial Chemistry & Materials

Industrial Chemistry & Materials 2023年第1期1卷 140-145页

作者： Wei Liu Qun Xu Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001P.R.China Department of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001P.R.China

Two-dimensional(2D)magnetic semiconductors are crucial in spin-based information-processing technologies due to the combination of the strong 2D quantum effects,surface effects and the control of spin ***,most experimental approaches for tuning 2D magnets achieve pure ferromagnetism at low ***,a defect engineering strategy using supercritical co2 is introduced to achieve nanostructure with abundant defects for 2D MoO3−x,and room-temperature ferromagnetism can be obtained and tuned by introduction of the Mo5+ion depending on the change of supercritical *** defective regions,the presence of the pentacoordinated[Mo5+O5]centers can achieve ferromagnetic ordering resulting in room-temperature *** increasing supercritical pressure,it is easier for the supercritical co2 to break the Mo–O bonds,achieving enhancement of the ferromagnetic performance with desired Curie temperature(>380 K).The magnetic responses in the MoO3−x system provide a step closer to the expansion of spin electronics.

关键词： supercritical co2 Room-temperature ferromagnetism Two-dimensional MoO3-x.

Key problems and solutions in supercritical co2 fracturing technology

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Frontiers in Energy 2019年第4期13卷 667-672页

作者： Haizhu WANG Gensheng LI Bin ZHU Kamy SEPEHRNOORI Lujie SHI Yong ZHENG Xiaomei SHI State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China China National Oil and Gas Exploration and Development co. LtdBeijing 100034China Hildebrand Department of Petroleum and Geosystems Engineering University of TexasAustin TX 78712USA

supercritical co2 fracturing is considered to be a new method for efficient exploitation of unconventional reservoirs,such as shale gas,coal bed methane,and tight sand stone *** co2 has many special properties including low viscosity,high diffusion coefficient,and lack of surface tension,which brings about great advantages for ***,these properties also cause several problems,such as difficulty in proppant transportation,high friction loss,and high pump *** this paper,the above problems were analyzed by combining field test with laboratory study and specific solutions to these problems are *** high frictionloss in the pipeline could be reduced by developing a new drag reducing agent and selecting large-size ***,for the problem of poor capacity in proppant carrying and sand plug,the methods of adding tackifier into supercritical co2,increasing pump displacement and selecting ultralow density proppants are ***,for the problem of fast leak-off and high requirement for pump displacement,the displacement can be increased or the pad fluid can be injected into the *** solving the above three problems,the field test of supercritical co2 fracturing can be *** research results can promote the industrialization process of supercritical co2 fracturing.

关键词： supercritical co2 fracturing friction loss proppant carrying flied test problem

supercritical co2 as a Dual template for fabrication of mesoporous cobalt metal-organic framework

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Supercritical CO2 as a Dual template for fabrication of meso...