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Boosting fire safety and mechanical performance of thermoplastic polyurethane by the face-to-face two-dimensional phosphorene/MXene architecture

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Journal of Materials Science & Technology 2022年第34期129卷 27-39页

作者： y.ng Luo yuhui xie Wei Geng Junhan Chu Hua Wu Delong xie Xinxin Sheng yi Mei yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan ProvinceFaculty of Chemical EngineeringKunming University of Science and TechnologyKunming 650500China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Department of Chemistry and Applied Biosciences Institute for Chemical and BioengineeringETH ZurichZurich 8093Switzerland

Black phosphorus(BP), as one of the most promising fillers for flame retarding polymer, has been seriously limited in practical application, due to the agglomeration and poor structural stability ***, the BP was modified by MXene and polydopamine(PDA) via ultrasonication and dopamine modification strategy to improve the structural stability and dispersibility in the matrix. Then, the obtained(BP-MXene@PDA) nanohybrid was employed to promote the mechanical performance, thermal stability,and flame retardancy of thermoplastic polyurethane elastomer(TPU). The resultant TPU composite containing 2 wt.% of BP1-MXene2@PDA showed a 19.2% improvement in the tensile strength and a 13.8%increase in the elongation at break compared to those of the pure TPU. The thermogravimetric analysis suggested that BP-MXene@PDA clearly enhances the thermal stability of TPU composites. Furthermore,the introduction of the BP-MXene@PDA nanohybrids could considerably improve the flame retardancy of TPU composite, i.e., 64.2% and 27.3% decrease in peak heat release rate and total heat release, respectively. The flame-retardant mechanisms of TPU/BP-MXene@PDA in the gas phase and condensed phase were investigated systematically. This work provides a novel strategy to simultaneously enhance the fire safety and mechanical properties of TPU, thus expanding its industrial applications.

关键词： Thermoplastic polyurethane elastomer Black phosphorus MXene Mechanical properties Flame retardancy

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A potential red-emitting phosphors scheelite-like triple molybdates LiKGd_2(MoO_4)_4:Eu^(3+) for white light emitting diode applications

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Science China(Technological Sciences) 2011年第1期54卷 70-75页

作者： xie An yUAN XiMing WAng FengXiang Department of Mechanical Engineering Xiamen University of Technology Xiamen 361024 China Engineering Research Center of Nano-Mineral Materials and Application Ministry of Education China University of Geosciences Wuhan 430074 China

A series of novel red-emitting phosphors scheelite-like triple molybdates ***（MoO4）4（0.1≤ x ≤ 1.9） were synthesized by solid state reaction method and their photoluminescence properties were investigated. The photoluminescence results show that all samples can be excited efficiently by UV （396 nm） light and blue （466 nm） light and emit red （615 nm） light with line spectra, which are coupled well with the characteristic emission from UV-LED and blue LED, respectively. The experimental results and their analysis suggest that the energy transfer occurs due to dipole-dipole interactions among Eu3＋ ions in LiKGd2-xEux（MoO4）4. Compared with Cao.8MoO4： Eu0.2^3-, the emission intensity of LiKGdo.9（MoO4）4： Eu1.1^3- is about 1.4 times higher and the CIE chromaticity coordinates are as close to the National Television System Committee （NTSC） standard values as those of Cao.8MoO4： Eu0.2^3-. The optical properties suggest that LiKGdo.9（MoO4）4： Eu1.1^3- is an efficient red-emitting phosphor for white LEDs applications.

关键词： phosphor triple molybdates LiKGd2-xEux(MoO4)4 white LEDs

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A low-density polyethylene composite with phosphorus-nitrogen based flame retardant and multi-walled carbon nanotubes for enhanced electrical conductivity and acceptable flame retardancy

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1332-1345页

作者： y.ng Luo yuhui xie Renjie Chen Ruizhi Zheng Hua Wu Xinxin Sheng Delong xie yi Mei yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan ProvinceFaculty of Chemical EngineeringKunming University of Science and TechnologyKunming650500China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Institute for Chemical and Bioengineering Department of Chemistry and Applied BiosciencesETH Zurich8093ZurichSwitzerland

Design and exploitation of flame retardant polymers with high electrical conductivity are desired for polymer applications in ***,a novel phosphorus-nitrogen intumescent flame retardant was synthesized from pentaerythritol octahydrogen tetraphosphate,phenylphosphonyl dichloride,and ***-density polyethylene was combined with the flame retardant and multi-walled carbon nanotubes to form a nanocomposite material via a ball-milling and hot-pressing *** electrical conductivity,mechanical properties,thermal performance,and flame retardancy of the composites were investigated using a four-point probe instrument,universal tensile machine,thermogravimetric analysis,and cone calorimeter tests,*** was found that the addition of multi-walled carbon nanotubes can significantly improve the electrical conductivity and mechanical properties of the low-density polyethylene ***,the combination of multi-walled carbon nanotubes and phosphorus–nitrogen flame retardant remarkably enhances the flame retardancy of matrixes with an observed decrease of the peak heat release rate and total heat release of 49.8%and 51.9%,*** study provides a new and effective methodology to substantially enhance the electrical conductivity and flame retardancy of polymers with an attractive prospect for polymer applications in electrical equipment.

关键词： MWCNTs PEPA electrical conductivity flame retardant low density polyethylene

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Two-dimensional linear connected-k system with trinary states and its reliability

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Journal of Systems Engineering and Electronics 2011年第5期22卷 866-870页

作者： Xian Zhao Wei Zhao Weijuan xie School of Management and Economics Beijing Institute of Technology Beijing 100081 P. R. China

Existing studies about two-dimensional consecutivek-out-of-n： F system is dealt with two states （either component or system）： working or failure. A new model for two-dimensional linear consecutive-k-out-of-n： F system is proposed, in which the components and systems can be at any of the three states： full working, derating working, and failure. Furthermore, two engineer- ing concrete instances of the new system are given. By using the finite Markov chain imbedding approach, the system reliability is presented in a unified formula with the product of matrices for the case of independent and identically distributed component states which can be extended to the independent but non-identical case easily. Finally, an example is given to illustrate the effectiveness of the above approach and tractability of various problems.

关键词： reliability two-dimensional systems trinary states

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Spatio-temporal variability of surface chlorophyll a in the yellow Sea and the East China Sea based on reconstructions of satellite data of 2001-2020

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Journal of Oceanology and Limnology 2024年第2期42卷 390-407页

作者： Weichen xie Tao WAng Wensheng JIAng Key Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China

Chlorophyll-a(Chl-a)concentration is a primary indicator for marine environmental *** spatio-temporal variations of sea surface Chl-a concentration in the yellow Sea(yS)and the East China Sea(ECS)in 2001-2020 were investigated by reconstructing the MODIS Level 3 products with the data interpolation empirical orthogonal function(DINEOF)*** reconstructed results by interpolating the combined MODIS daily+8-day datasets were found better than those merely by interpolating daily or 8-day ***-a concentration in the yS and the ECS reached its maximum in spring,with blooms occurring,decreased in summer and autumn,and increased in late autumn and early *** performing empirical orthogonal function(EOF)decomposition of the reconstructed data fields and correlation analysis with several potential environmental factors,we found that the sea surface temperature(SST)plays a significant role in the seasonal variation of Chl a,especially during spring and *** increase of SST in spring and the upper-layer nutrients mixed up during the last winter might favor the occurrence of spring *** high sea surface temperature(SST)throughout the summer would strengthen the vertical stratification and prevent nutrients supply from deep water,resulting in low surface Chl-a *** sea surface Chl-a concentration in the yS was found decreased significantly from 2012 to 2020,which was possibly related to the Pacific Decadal Oscillation(PDO).

关键词： chlorophyll a(Chl a) data interpolation empirical orthogonal function(DINEOF) empirical orthogonal function(EOF)analysis yellow Sea East China Sea

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Kinetic assessment of measured mass flow rates and streamwise pressure distributions in microchannel gas flows

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Acta Mechanica Sinica 2007年第2期23卷 145-148页

作者： Jing Fan Chong xie Jianzheng Jiang Instituie of Mechanics Chinese Academy of SciencesBeijing 100080 China

Measured mass flow rates and streamwise pressure distributions of gas flowing through microchannels were reported by many researchers. Assessment of these data is crucial before they are used in the examination of slip models and numerical schemes, and in the design of microchannel elements in various MEMS devices. On the basis of kinetic solutions of the mass flow rates and pressure distributions in microchannel gas flows, the measured data available are properly normalized and then are compared with each other. The 69 normalized data of measured pressure distributions are in excellent agreement, and 67 of them are within 1 ± 0.05. The normalized data of mass flow-rates ranging between 0.95 and 1 agree well with each other as the inlet Knudsen number Kni 〈 0.02, but they scatter between 0.85 and 1.15 as Kni 〉 0.02 with. to some extent, a very interesting bifurcation trend.

关键词： Microchannel . Measured data .Kinetic assessment

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Simultaneous cooperative relative localization and distributed formation control for multiple UAVs

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Science China(Information Sciences) 2020年第1期63卷 238-240+265-269页

作者： Kexin GUO Xiuxian LI Lihua xie School of Electrical and Electronic Engineering Nanyang Technological University Beihang University Hangzhou Innovation Institute

Dear editor,In recent years, formation control of multiple unmanned aerial vehicles (UAVs) has been widely studied [1]. As a motion control strategy, it aims to realize UAV swarms with many practical applications such as surveillance, rescue and inspection in complex environments, especially in GPSdenied environments. Formation flights have been demonstrated by many researchers, but most still

关键词： UAV Simultaneous cooperative relative localization and distributed formation control for multiple UAVs

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The effects of fabrication atmosphere condition on the microstructural and mechanical properties of laser direct manufactured stainless steel 17-4 PH

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Journal of Materials Science & Technology 2019年第7期35卷 1315-1322页

作者： D.Wang C.T.Chi W.Q.Wang y.L.Li M.S.Wang X.G.Chen Z.H.Chen X.P.Cheng y.J.xie Institute of Applied Physics Jiangxi Academy of SciencesNanchang 330029China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Mechanical and Electrical Engineering Nanchang UniversityNanchang 330029China Jiangxi Reman Additive Technology Co. Ltd Nanchang 330096China

The effects of atmosphere conditions on microstructural and mechanical properties of stainless steel 17-4PH components fabricated by laser direct manufacturing (LDM) were investigated through mea-surements on phase constitution, porosity, tensile strength, fracture morphology, hardness and evolution of substrate temperature. Results showed that the samples produced in air atmosphere condition pos-sessed higher tensile strength and hardness for both as-deposited and heat-treated states than that in Ar chamber condition, due to dispersion strengthening effect of amorphous oxide particles and nitrogen solution strengthening as a result of higher content of oxygen and nitrogen. The temperature of substrate heat accumulation was higher in Ar chamber condition, leading to dramatically lower porosity and more reverse austenite, which also contributed to the lower strength and hardness.

关键词： Additive manufacturing Laser direct manufacturing 17-4 PH stainless steel Fabrication atmosphere Mechanical properties

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Toeplitz operators on H^2(iR)

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Science China Mathematics 2011年第9期54卷 1995-2004页

作者： xie PeiZhu CAO GuangFu Department of Mathematics Sun Yat-sen University Guangzhou 510275 China Department of Mathematics Guangzhou University Guangzhou 510006 China

In this paper,the essential spectra of Toeplitz operators is discussed,and the K-theory of the Toeplitz algebra generated by {Tφ|φ∈C(iR)} is *** addition,the characteristic equation of Toeplitz operators is obtaine... 详细信息

关键词： Toeplitz operator Hardy space Fredholm theory

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阳离子-π相互作用调控提升单原子催化剂性能的通用策略

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中国科学：化学 2024年第7期54卷 969-970页

作者：谢毅中国科学技术大学合肥微尺度物质科学国家研究中心合肥230026

金属单原子催化剂具有金属原子利用率高、金属活性位点可设计性强、金属配位不饱和度高等优势,在众多催化反应过程中展现出优异的性能,是当前能源转换材料领域的研究前沿和热点[1].由于金属单原子具有较高的表面能,其容易发生聚集,需要... 详细信息

金属单原子催化剂具有金属原子利用率高、金属活性位点可设计性强、金属配位不饱和度高等优势,在众多催化反应过程中展现出优异的性能,是当前能源转换材料领域的研究前沿和热点[1].由于金属单原子具有较高的表面能,其容易发生聚集,需要将金属单原子锚定在合适的载体材料上并形成强相互作用,以抑制金属单原子的迁移团聚,从而实现金属组分的原子级分散[2].

关键词：催化反应过程单原子原子利用率强相互作用不饱和度载体材料能源转换原子级

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