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A novel nano-thermite system with BiOF as fluorine-containing oxidant for enhanced energy release performance

CHEMICAL ENGINEERING JOURNAL 2023年第1期468卷

作者： Li, Jingwei liu, xuwen Huang, Qian liu, Feifan Xie, Quanmin Hu, Maocong Su, Jiaxin Zhang, Chengchen Zeng, Yuyang Zhu, Chenguang Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430113 Peoples R China Shaanxi Appl Phys Chem Res Inst Sci & Technol Appl Phys Chem Lab Xian 710061 Peoples R China

The reduced diffusion distance of nano-thermite results in an exceptionally high energy release rate and intense exothermic reactions upon ignition, which has drawn significant interest from researchers in the field of energetic materials. With the deepening of research, metal fluorides are gradually favored by researchers because of their unique reaction characteristics. This paper presents the synthesis of a new fluorine-containing oxidant, BiOF, and its use in the preparation of a novel nano-thermite with n-Al. BiOF crystals exhibit a unique microscopic morphology and are interlaced into "nanoflower" microspheres, which allows for good interfacial contact between the oxidant and fuel during the recombination process. The resulting n-Al/BiOF system displays excellent ignition and combustion performance, with a combustion temperature higher than the boiling point of its main combustion products, AlF3 and Bi. Compared with n-Al/CuO and n-Al/MoO3 systems, n-Al/BiOF exhibits a higher flame propagation rate under confinement. In addition, the ignition threshold of the n-Al/BiOF system is also smaller than that of the n-Al/CuO and n-Al/MoO3 systems. Furthermore, the paper examines the reaction mechanism of the n-Al/BiOF system through thermal reaction path analysis and combustion and thermal analysis product characterization. The paper discovers a "pre-ignition" reaction mechanism before the ignition temperature, where the strongly electronegative fluorine in BiOF corrodes the Al2O3 shell, promoting the release of aluminum energy. The synergistic and effective interaction between oxygen, fluorine, and fuel aluminum in the n-Al/BiOF system results in efficient energy release performance, making BiOF a promising candidate for n-Al based reactive materials in propellants, explosives, and pyrotechnic products.

关键词： Nano-thermites Nanostructured energetic materials Conformational relationships Fluorinated oxidizing agent Pre-ignition reaction

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Effect of tetrahedral amorphous carbon coating on the resistivity and wear of single-walled carbon nanotube network

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JOURNAL OF APPLIED PHYSICS 2016年第18期119卷 185306-185306页

作者： Iyer, Ajai Kaskela, Antti Novikov, Serguei Etula, Jarkko liu, xuwen Kauppinen, Esko I. Koskinen, Jari Aalto Univ Sch Chem Technol Dept Mat Sci & Engn POB 16200 Espoo 00076 Finland Aalto Univ Sch Sci Dept Appl Phys NanoMat Grp POB 15100 Espoo 00076 Finland Aalto Univ Dept Micro & Nanosci POB 13500 Espoo 00076 Finland

Single walled carbon nanotube networks (SWCNTNs) were coated by tetrahedral amorphous carbon (ta-C) to improve the mechanical wear properties of the composite film. The ta-C deposition was performed by using pulsed filtered cathodic vacuum arc method resulting in the generation of C+ ions in the energy range of 40-60 eV which coalesce to form a ta-C film. The primary disadvantage of this process is a significant increase in the electrical resistance of the SWCNTN post coating. The increase in the SWCNTN resistance is attributed primarily to the intrinsic stress of the ta-C coating which affects the inter-bundle junction resistance between the SWCNTN bundles. E-beam evaporated carbon was deposited on the SWCNTNs prior to the ta-C deposition in order to protect the SWCNTN from the intrinsic stress of the ta-C film. The causes of changes in electrical resistance and the effect of evaporated carbon thickness on the changes in electrical resistance and mechanical wear properties have been studied. Published by AIP Publishing.

关键词： Carbon Carbon nanotubes Thin films Electron beam deposition Electrical resistivity

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Aluminum oxide from trimethylaluminum and water by atomic layer deposition: The temperature dependence of residual stress, elastic modulus, hardness and adhesion

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THIN SOLID FILMS 2014年第0期552卷 124-135页

作者： Ylivaara, Oili M. E. liu, xuwen Kilpi, Lauri Lyytinen, Jussi Schneider, Dieter Laitinen, Mikko Julin, Jaakko Ali, Saima Sintonen, Sakari Berdova, Maria Haimi, Eero Sajavaara, Timo Ronkainen, Helena Lipsanen, Harri Koskinen, Jari Hannula, Simo-Pekka Puurunen, Riikka L. VTT Tech Res Ctr Finland FI-02044 Espoo Finland Aalto Univ Sch Chem Technol Dept Mat Sci & Engn FI-00076 Aalto Finland Fraunhofer IWS Dresden D-01277 Dresden Germany Univ Jyvaskyla Dept Phys FI-40014 Jyvaskyla Finland Aalto Univ Sch Elect Engn Dept Micro & Nanosci FI-00076 Aalto Finland Aalto Univ Sch Chem Technol Dept Mat Sci & Engn FI-00076 Aalto Finland Aalto Univ Sch Chem Technol Micronova Nanofabricat Ctr FI-00076 Aalto Finland

Use of atomic layer deposition (ALD) in microelectromechanical systems (MEMS) has increased as ALD enables conformal growth on 3-dimensional structures at relatively low temperatures. For MEMS device design and fabrication, the understanding of stress and mechanical properties such as elastic modulus, hardness and adhesion of thin film is crucial. In this work a comprehensive characterization of the stress, elasticmodulus, hardness and adhesion of ALD aluminum oxide (Al2O3) films grown at 110-300 degrees C from trimethylaluminum and water is presented. Film stress was analyzed by wafer curvature measurements, elastic modulus by nanoindentation and surface-acoustic wave measurements, hardness by nanoindentation and adhesion by microscratch test and scanning nanowear. The films were also analyzed by ellipsometry, optical reflectometry, X-ray reflectivity and time-of-flight elastic recoil detection for refractive index, thickness, density and impurities. The ALD Al2O3 films were under tensile stress in the scale of hundreds of MPa. The magnitude of the stress decreased strongly with increasing ALD temperature. The stress was stable during storage in air. Elastic modulus and hardness of ALD Al2O3 saturated to a fairly constant value for growth at 150 to 300 degrees C, while ALD at 110 degrees C gave softer films with lower modulus. ALD Al2O3 films adhered strongly on cleaned silicon with SiOx termination. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Atomic layer deposition Residual stress Elastic modulus Hardness Adhesion Aluminum oxide

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完善招生政策加大宣传力度为学院加快发展奠定坚实基础

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潍坊教育学院学报 2007年第1期20卷 6-7,12页

作者：刘绪文潍坊教育学院学生处山东青州262500

本文就如何完善招生政策,探索建立新的招生工作机制,加大宣传力度,扎扎实实抓好2007年的招生工作,为学院的加快发展奠定坚实的基础从七个方面探讨了新形势下招生工作的思路和对策。

关键词：招生工作加快发展信息观念专业建设

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基于改进Critic-G1算法的发电商市场力综合评价方法

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中国电力 2021年第11期54卷 59-67页

作者：李雪松蒋宇刘胥雯王阳丁羽江苏电力交易中心有限公司江苏南京210008

电力市场领域中,发电商市场力的存在会导致电力资源配置效率低下,损害社会福利,降低市场竞争效率。对发电商行使市场力的行为方式进行分析,建立发电商市场力风险评估指标体系,并应用改进Critic-G1组合赋权法对某地区发电商市场力风险进... 详细信息

电力市场领域中,发电商市场力的存在会导致电力资源配置效率低下,损害社会福利,降低市场竞争效率。对发电商行使市场力的行为方式进行分析,建立发电商市场力风险评估指标体系,并应用改进Critic-G1组合赋权法对某地区发电商市场力风险进行综合评价。算例结果表明,该地区发电商市场力水平各异。所提方法已在华东某省电力市场得到了实际应用并取得良好的效果,可为其他地区市场运营机构有效识别发电商市场力风险提供一定的依据及参考。

关键词：风险评估发电商市场力改进Critic法 G1法组合赋权法

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Serum metabolomics reveals the intervention mechanism and compatible regularity of Chaihu Shu Gan San on chronic unpredictable mild stress-induced depression rat model

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JOURNAL OF PHARMACY AND PHARMACOLOGY 2020年第8期72卷 1133-1143页

作者： Zhang, Hongye Huang, Huimin Song, Hui Chin, Bonnie Zheng, Hua Ruan, Junxiang Wu, Fang Cheng, Bang Wu, Jinxia liu, xuwen Liang, Yonghong Song, Fangming Chen, Zhaoni Tang, Chaoling Lu, Shiyin Guo, Hongwei Zou, Zhongmei Su, Zhiheng Guangxi Med Univ Pharmaceut Coll Nanning 530021 Peoples R China Shenyang Pharmaceut Univ Dept Clin Pharm Shenyang Peoples R China Guangxi Med Univ Med Sci Res Ctr Nanning Peoples R China Guangxi Med Univ Chinese Minist Educ Key Lab Longev & Aging Related Dis Nanning Peoples R China Guangxi Med Univ Ctr Translat Med Nanning Peoples R China Chinese Acad Med Sci & Peking Union Med Coll Inst Med Plant Dev Beijing 100193 Peoples R China

Objectives To provide a comprehensive study of the intervention mechanism and compatible regularity of Chaihu Shu Gan San (CSGS) in a chronic unpredictable mild stress (CUMS)-induced depression model. Methods Ethological study and ELISA assay were applied to measure the phenotypes of depression after CUMS stimulate and assess the antidepressant activity of fluoxetine, CSGS and its compatibilities. The serum metabolic profile changes were revealed by untargeted Q/TOF MS-based metabolomics followed by multivariate statistical analysis. Key findings CSGS exhibits an significant intervention effect on CUMS-induced depression. After the multivariate statistical analysis, 17 potential serum biomarkers were identified and 16 of them could be regulated by CSGS. The intervention of CSGS on CUMS-induced depression involved five key pathways. Moreover, each functional unit (monarch, minister, assistant and guide medicine) in CSGS regulates different metabolites and metabolic pathways to achieve different effects on antidepressant;however, their intervention efficacies are inferior to the holistic formula, which may be due to the synergism of bioactive ingredients in the seven herbs of CSGS. Conclusions CSGS produced an obvious antidepressant activity. The comprehensive and holistic metabolomics approach could be a powerful tool to study the intervention mechanism and the compatibility rule of traditional Chinese medicine.

关键词： antidepression Chaihu Shu Gan San chronic unpredictable mild stress-induced depression compatibility serum metabolomics ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry

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Thermal and plasma enhanced atomic layer deposition of SiO₂ using commercial silicon precursors

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THIN SOLID FILMS 2014年 558卷 93-98页

作者： Putkonen, Matti Bosund, Markus Ylivaara, Oili M. E. Puurunen, Riikka L. Kilpi, Lauri Ronkainen, Helena Sintonen, Sakari Ali, Saima Lipsanen, Harri liu, xuwen Haimi, Eero Hannula, Simo-Pekka Sajavaara, Timo Buchanan, Iain Karwacki, Eugene Vaha-Nissi, Mika VTT Tech Res Ctr Finland FI-02044 Espoo Finland Aalto Univ Sch Chem Technol Inorgan Chem Lab FI-00076 Espoo Finland Beneq Oy FI-01510 Vantaa Finland Aalto Univ Sch Elect Engn Dept Micro & Nanosci FI-00076 Espoo Finland Aalto Univ Sch Chem Technol Dept Mat Sci & Engn FI-00076 Espoo Finland Univ Jyvaskyla Dept Phys FI-40014 Jyvaskyla Finland Air Prod & Chem Inc Allentown PA 18195 USA

In this paper, we report ALD deposition of silicon dioxide using either thermal or plasma enhanced atomic layer deposition (PEALD). Several aminosilanes with differing structures and reactivity were used as silicon precursors in R&D single wafer ALD tools. One of the precursors was also tested on pilot scale batch ALD using O-3 as oxidant and with substrates measuring 150 x 400 mm. The SiO2 film deposition rate was greatly dependent on the precursors used, highest values being 1.5-2.0 angstrom/cycle at 30-200 degrees C for one precursor with an O-2 plasma. According to time-of-flight-elastic recoil detection analysis measurements carbon and nitrogen impurities were relatively low, but hydrogen content increased at low deposition temperatures. (C) 2014 Elsevier B.V. All rights reserved.

关键词： Atomic layer deposition Plasma-enhanced atomic layer deposition Precursors Silicon dioxide Batch deposition Conformal coating

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Recent Development of the Magnetic Shape Memory Materials Research in Finland

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MRS Online Proceedings Library (OPL) 2011年第1期1200卷 1200-G03-03-1200-G03-03页

作者： Outi Söderberg Ilkka Aaltio Yanling Ge Alexandr Soroka Raisa Niemi xuwen liu Simo-Pekka Hannula outi.soderberg@tkk.fi TKK Helsinki University of Technology Department of Materials Science and Engineering Espoo Finland ilkka.aaltio@tkk.fi TKK Helsinki University of Technology Department of Materials Science and Engineering Espoo Finland yanling.ge@tkk.fi TKK Helsinki University of Technology Department of Materials Science and Engineering Espoo Finland asoroka@cc.hut.fi AdaptaMat Ltd. Helsinki Finland raisa.niemi@tkk.fi TKK Helsinki University of Technology Department of Materials Science and Engineering Espoo Finland xuwen.liu@tkk.fi TKK Helsinki University of Technology Department of Materials Science and Engineering Espoo Finland simo-pekka.hannula@tkk.fi TKK Helsinki University of Technology Department of Materials Science and Engineering Espoo Finland

Ni-Mn-Ga based magnetic shape memory (MSM) materials have been studied since 1998 in Finland at the Helsinki University of Technology (TKK, previously HUT). The large HUT-MSM-project resulted in MSM-alloys with high service temperature, 10 % field-induced-strain, as well as circumstances when and how a Ni-Mn-Ga alloy exhibits this phenomenon. The understanding of the structure and behavior of twin boundaries, and their role, for example, in the vibration damping and long-term actuation has been enhanced in the recent projects. Twin boundaries have been studied by XRD, by high-resolution transmission electron microscopy (HRTEM), and by in-situ straining in TEM, the last one in co-operation with the Institute of Physics in Prague (ASCR-IP), Czech Republic. The results obtained by neutron diffraction in co-operation with Hahn-Meitner-Institut Berlin, Institute for Metal Physics (IMP), Kiev, and Institut Laue-Langevin (ILL), Grenoble, have given new crystallographic information. Damping of Ni-Mn-Ga polymer composites has been proved to be excellent at high stiffness levels with the loss factor = 0.6 at E ≈ 1 GPa. This research was carried out in co-operation with the University of California Los Angeles (UCLA), USA. In the long-term actuation, a fatigue life of 2×109 has been recorded for a five-layered modulated Ni-Mn-Ga structure in mechanical cycling. The evolution of the MSM parameters during the long-term use is recorded and used as an input data for the models developed in the European MAFESMA co-operation. The search for alloys with wide stable thermal property range showing MSM effect has continued and alloys that are stable down to 4 K have been established. Modeling based on Ginsburg-Landau theory has been applied to evaluate aging and thermal fluctuations in the modulated Ni-Mn-Ga structures. As a commercial target, AdaptaMat Ltd. develops technology to produce Ni-Mn-Ga magnetic shape memory material with improved quality, lower twinning stress, longer fatigu

关键词： actuator fatigue composite

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论新时代全过程人民民主的科学意蕴

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云南行政学院学报 2024年第1期26卷 11-21页

作者：刘旭雯广西大学马克思主义学院

新时代更好推进全过程人民民主建设需要阐释好“因何推进”“推进什么”“谁来推进”“怎样推进”的科学意蕴。在“因何推进”上,全过程人民民主是全面建设社会主义现代化国家的应有之义、是实现人民美好生活的迫切要求,是关系跳出历史... 详细信息

新时代更好推进全过程人民民主建设需要阐释好“因何推进”“推进什么”“谁来推进”“怎样推进”的科学意蕴。在“因何推进”上,全过程人民民主是全面建设社会主义现代化国家的应有之义、是实现人民美好生活的迫切要求,是关系跳出历史周期率的重大问题;在“推进什么”上,全过程人民民主要体现三个“最”、四个“统一”和三个“全”;在“谁来推进”上,要充分发挥中国共产党顶层设计的领导作用、政府治理的积极主导作用以及人民群众创新实践的推动作用;在“怎样推进”上,要通过思想、制度、手段层面上的具体路径形成整体合力。

关键词：全过程人民民主人民当家作主新时代科学意蕴

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硝酸四氨合铜对n-Al/MoO_(3)纳米铝热体系反应特性的影响

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爆破器材 2024年第5期53卷 44-49,54页

作者：刘平雷钫琴余杰刘旭文湖南神斧集团向红机械化工有限责任公司湖南岳阳414100 某部驻长沙地区军事代表室湖南长沙410007 江汉大学精细爆破国家重点实验室湖北武汉430056 南京理工大学化学与化工学院江苏南京210094

为了提高n-Al/MoO_(3)纳米铝热体系的增压能力,改善能量释放性能,合成了高能产气组分硝酸四氨合铜(TACN),并将TACN复合入n-Al/MoO_(3)体系中。利用扫描电子显微镜(SEM)、X-射线衍射(XRD)技术研究了复合材料的形貌和微观结构。采用差示... 详细信息

为了提高n-Al/MoO_(3)纳米铝热体系的增压能力,改善能量释放性能,合成了高能产气组分硝酸四氨合铜(TACN),并将TACN复合入n-Al/MoO_(3)体系中。利用扫描电子显微镜(SEM)、X-射线衍射(XRD)技术研究了复合材料的形貌和微观结构。采用差示扫描量热仪-热重分析(DSC-TG)联用技术探讨了各体系的热反应路径。使用高速摄像机和密闭爆发器分析了纳米铝热体系的火焰增长与传播和压力输出特性,评估了TACN的加入对n-Al/MoO_(3)体系的能量释放速率和增压性能的影响。研究结果表明:n-Al/MoO_(3)体系中加入的TACN能够在铝热反应的温度前放热分解,有效活化纳米铝与金属氧化物间的界面,从而降低体系的初始反应峰温度。此外,TACN的加入显著增强了n-Al/MoO_(3)体系的能量释放和压力输出性能。当TACN的质量分数为6%时,n-Al/MoO_(3)体系的火焰增长速率和火焰传播速率分别增加了32%和30%,峰值压力和增压速率分别提高了26%和70%。综上所述,TACN可提升n-Al/MoO_(3)纳米铝热体系的压力输出,并调控体系的能量释放性能。

关键词： n-Al/MoO_(3) 高能产气组分纳米铝热剂含能配合物

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