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Manufacturing of ceramic cores:From hot injection to 3D printing

Journal of Materials Science & Technology 2023年第3期134卷 95-105页

作者： Qiaolei Li Tianci Chen Jingjing Liang Chaowei Zhang Jinguo Li Yizhou Zhou Xiaofeng Sun School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shichangxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Space Manufacturing Technology(CAS Key Lab) Beijing 100094China

With the improvement of aero-engine performance,the preparation of hollow blades of single-crystal superalloys with complex inner cavity cooling structures is becoming increasingly *** ceramic core is the key intermediate part of the preparation and has attracted wide *** meet this challenge,new technologies that can make up for the defects of long periods and high costs of fabricating complex structural cores by traditional hot injection technology are *** photopolymerization 3D printing ceramic technology has been applied to the core field to realize the rapid preparation of complex structural ***,the industrial application of this technology still needs further research and ***,ceramic cores were prepared using traditional hot injection and vat photopolymerization 3D printing techniques using fused silica,nano-ZrO_(2),and Al_(2)O_(3) powders as starting *** 3D printed ceramic core has a typical layered structure with a small pore size and low *** of the layered structure,the pore area is larger than that of the hot injection ceramic core,the leaching performance has little effect(0.0277 g/min for 3D printing cores,0.298 g/min for hot injection cores).In the X and Y directions,the sintering shrinkage is low(2.7%),but in the Z direction,the shrinkage is large(4.7%).The fracture occurs when the inner layer crack expands and connects with the interlayer crack,forming a stepped fracture in the 3D-printed *** bending strength of the 3D printed core at high temperature(1500℃)is 17.3 *** analyses show that the performance of vat photopolymerization 3D-printed ceramic cores can meet the casting requirements of single crystal superalloy blades,which is a potential technology for the preparation of complex structure ceramic *** research mode of 3D printing core technology based on the traditional hot injection process provides an effective new idea for promoting the industrial applicati

关键词： Ceramic cores 3D printing hot injection Anisotropic Layer structure

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Engineering crystal phase of polytypic CuInS2 nanosheets for enhanced photocatalytic and photoelectrochemical performance

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Nano Research 2020年第2期13卷 583-590页

作者： He Li Wenjiang Li Wei Li Minfang Chen Rony Snyders Carla Bittencourt Zhihao Yuan Key Iaboratory of Display Materials C Photoelectric Devices School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Chimie des Interactions Plasma-Surface University of Mons(UMONS)20 Place du Parc7000 MonsBelgium Materia Nova Research Centre 1 Avenue Nicolas CopernicB 7000 MonsBelgium

Crystal phase engineering on CulnS2(CIS)nanocrystals,especially polytypic structure,has become one of the research hotspots to design the advanced materials and devices for energy conversion and environment ***,the polytypic CIS nanosheets(NSs)including zincblende/wutzite and chalcopyrite/wurtzite types were first time achieved in a hot-injection system using oleic acid and liquid paraffin as the reaction ***-obtained polytypic CIS NSs exhibit significantly enhanced light-absorption abillty and visible-light-driven photocatalytic performance originating from the rational hetero-crystalline interfaces and surface defect states,which efficiently inhibit the recombination of photo-generated ***,the polytypic CIS NSs were spin-coated onto the surface of fluorinated-tin oxide glass substrate and used as the photoelectrode,which shows an excellent photoelectrochemical(PEC)activity in aqueous *** present work not only provides a facile,rapid,low-cost,and environmental-friendly synthesis strategy to design the crystal phase and defect structure of ternary chalcogenides,but also demonstrates the relationships between the polytypic structure and photocatalytic/photoelectrochemical properties.

关键词： CuInS2 polytypic defect hot injection photocatalytic photoelectrochemical activity

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Bi_(2)S_(3) Nanostructures: A New Photocatalyst

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Nano Research 2010年第5期3卷 379-386页

作者： Tong Wu Xinggui Zhou Hua Zhang Xinhua Zhong State Key Laboratory of Chemical Engineering Department of ChemistryEast China University of Science and TechnologyShanghai 200237China

Uniform colloidal Bi_(2)S_(3) nanodots and nanorods with different sizes have been prepared in a controllable manner via a hot injection method. X-ray diffraction (XRD) results show that the resulting nanocrystals have an orthorhombic structure. Both the diameter and length of the nanorods increase with increasing concentration of the precursors. All of the prepared Bi_(2)S_(3) nanostructures show high efficiency in the photodegradation of rhodamine B, especially in the case of small sized nanodots-which is possibly due to their high surface area. The dynamics of the photocatalysis is also discussed.

关键词： Bi_(2)S_(3) nanostructures hot injection photocatalyst

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A novel method of water remediation of organic pollutants and industrial wastes by solution- route processed CZTS nanocrystals

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Journal of Materiomics 2021年第5期7卷 904-919页

作者： Pooja Semalti Vikash Sharma Shailesh Narain Sharma CSIR-National Physical Laboratory(NPL) Dr.K.S.Krishnan RoadNew Delhi110012India Academy of Scientific and Innovative Research(AcSIR) Council of Scientific&Industrial Research(CSIR)-Human Resource Development Centre(CSIRHRDC)CampusGhaziabadUttar Pradesh201002India

CZTS(Cu_(2)ZnSnS_(4)),a P-type semiconductor with a direct bandgap(1.2-1.7eV),earth-abundant,non-toxic,and has a large absorption coefficient makes it extremely useful in optoelectronics and light-harvesting *** this work,CZTS is prepared by an ingenious,cost-effective colloidal route using the‘hotinjection’method with the usage of different *** XRD and Raman spectroscopy shows the single-phase highly crystalline CZTS nanoparticles with kesterite *** TEM results show that the size of CZTS nanoparticles is about 2-5 nm and monodispersity is confirmed by DLS(Dynamic Light Scattering).FTIR confirms the presence of different ligands used in CZTS *** Uv-vis absorption shows the direct bandgap of *** contact angle study shows the hydrophobic nature of as-synthesized CZTS nanoparticles which were further ligand exchanged with L-cysteine hydrochloride to make it hydrophilic to study the photocatalytic degradation activity of organic pollutants and industrial waste in the *** photocatalysis experiments were performed under two conditions:(i)under bare sunlight(Intensity~900 W/m^(2))(ii)focussing the sample under the sunlight via converging lens(1800 W/m^(2)).The photocatalytic efficiencies were then compared and the best photocatalytic efficiency achieved under sunlight was 98.4%for organic pollutants and 75%for industrial waste via converging lens while the corresponding efficiencies with bare sunlight were 98.1% and 73% *** the best of the author’s knowledge,a rapid and highly efficient photocatalysis of CZTS NPs employing a converging lens for water-remediation without the usage of noble&transition-metals has been reported for the first time.

关键词： Photocatalysis Copper zinc tin sulfide(CZTS) Converging lens Industrial waste hot injection Organic pollutants Nanoparticles TOP TOPO

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Earth-abundant CuFeS_(2) nanocrystals@graphite felt electrode for high performance aqueous polysulfide/iodide redox flow batteries

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Chinese Journal of Structural Chemistry 2024年第1期43卷 16-23页

作者： Tsegaye Tadesse Tsega Jiantao Zai Chin Wei Lai Xin-hao Li Xuefeng Qian School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai200240China Nanotechnology and Catalysis Research Centre(NANOCAT) Institute for Advanced Studies(IAS)University of Malaya3rd FloorBlock A50603 Kuala LumpurMalaysia Key Laboratory of Green and High-end Utilization of Salt Lake Resources Chinese Academy of SciencesChina

Due to their high energy density and low price,aqueous polysulfide/iodide redox flow batteries are appealing for scalable energy ***,the greatest barrier to their practical uses is the low electrochemical kinetics of the redox reactions of polysulfide ions on graphite electrodes,which often limit their energy efficiency and power *** this study,the CuFeS_(2)nanomaterial was successfully synthesized through the hot injection method,and CuFeS_(2)nanomaterials were uniformly coated onto the surfaces and sandwiched into graphite felt(GF);this process can significantly boost the electrocatalytic activities of S^(2-)/S^(2-)_(x)redox reactions by improving the charge transfer process,which has been proven by the electrochemical measurement and density functional theory(DFT)*** polysulfide-iodide flow battery,with GF-CuFeS_(2)serving as the negative electrode,can achieve a high energy efficiency of 79.6%at 20 mA/cm^(2),a power density of 50.7 mW/cm^(2),and a stable energy efficiency retention of 87.0%after 180 cycles.

关键词： CuFeS_(2) hot injection Flow battery Nanomaterial DFT

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高稳定性铋基钙钛矿纳米晶的可控合成:结构和光物理性质

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Science China Materials 2023年第5期66卷 2079-2089页

作者：耿慧芳黄转转耿华修刘思宇 Maria A Naumova Raffaele Salvia 陈司淇韦钧励张丽芙邹贤劭林伟华蔡欣怡袁明鉴胡振芃沈希于日成郑凯波 Sophie E.Canton 付学文 Ultrafast Electron Microscopy Laboratory Key Laboratory of Weak-Light Nonlinear Photonics(Ministry of Education)School of PhysicsNankai UniversityTianjin 300071China Institute of Molecular Plus Tianjin UniversityTianjin 300072China Deutsches Elektronen-Synchrotron DESY Notkestr.8522607 HamburgGermany Scuola Normale Superiore Piazza dei Cavalieri 7IT-56126 Pisa(PI)Italy Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China Chemical Physics and Nano Lund Lund UniversityBox 12422100 LundSweden Binhai College Nankai UniversityTianjin 300270China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Chemistry Technical University of DenmarkDK-2800 Kongens LyngbyDenmark Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

铋基钙钛矿因毒性低成为铅基钙钛矿的潜在替代品.目前,对铋基钙钛矿纳米晶的化学组成、晶体结构以及光物理过程的研究还缺乏系统性.特别地,紫外-可见吸收光谱和激发态载流子动力学,在已发表的论文中存在相当大的争议.在本文中,我们通过... 详细信息

铋基钙钛矿因毒性低成为铅基钙钛矿的潜在替代品.目前,对铋基钙钛矿纳米晶的化学组成、晶体结构以及光物理过程的研究还缺乏系统性.特别地,紫外-可见吸收光谱和激发态载流子动力学,在已发表的论文中存在相当大的争议.在本文中,我们通过热注入法成功地合成了纯相的Cs_(3)BiBr_(6)和Cs_(3)Bi_(2)Br_(9)纳米晶,并通过调节热注入的温度来精确控制二者的化学组成和结构.在此基础上,系统研究了不同形貌和不同尺寸的Cs_(3)Bi_(2)Br_(9)纳米晶的紫外-可见吸收光谱,澄清了在这方面存在的争议.采用飞秒瞬态吸收光谱系统研究了Cs_(3)Bi_(2)Br_(9)纳米晶的激发态载流子动力学,结果表明载流子在被激发后的3 ps内会发生一个自捕获过程.与配体辅助再沉积法相比,用热注入法制备的Cs_(3)Bi_(2)Br_(9)纳米晶具有更好的光稳定性.基于Cs_(3)Bi_(2)Br_(9)纳米晶的光电探测器具有灵敏的光响应,显示出其在光电探测方面的应用潜力.

关键词： lead-free perovskites bismuth perovskites nanocrystals hot injection photostability

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