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Fabrication and thermal decomposition of glycidyl azide polymer modified nitrocellulose double base propellants

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Science China Chemistry 2016年第4期59卷 472-477页

作者： Benbo Zhao Tianfu Zhang zhen ge Yunjun Luo School of Materials Science and Engineering Beijing Institute of Technology

Glycidyl azide polymer （GAP） with the advantages of non-volatility and excellent thermal stability is a candidate as a re- placement for nitroglycerine （NG） in a double base propellant. The GAP-NC double base propellants were formulated with GAP and nitrocellulose （NC） fibers. Tensile test and SEM characterization indicated that GAP-NC propellants had a homoge- neous structure. Thermogravimetric analysis of GAP-NC propellants revealed that the onset decomposition temperature reached a high level ranging from 192.9 to 194.6 ℃, which indicated that the substitution of NG with GAP contributed to the safe storage and process operations for double base propellant. The result analysis of decomposition products of GAP-NC propellants showed that the main gas decomposition products of the propellants were NO, NO〉 CO, CO2, NH3, CH4, HCN, N2 CH20 and C2H40. The thermal decomposition process of the specimens was proposed.

关键词： glycidyl azide polymers (GAP) nitrocellulose double base propellant nitroglycerine thermal decomposition

Single-Cell RNA Sequencing Reveals Cell-Type-Specific Mechanisms of Neurological Diseases

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Neuroscience Bulletin 2020年第7期36卷 821-824页

作者： zhen-ge Luo Jian Peng Ting Li School of Life Science and Technology ShanghaiTech UniversityShanghai 200031China Institute of Neuroscience State Key Laboratory of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai 200031China University of the Chinese Academy of Sciences Beijing 100049China

Single-cell transcriptomic analysis has provided an unprecedented avenue for the identification of neuronal subtypes that are affected in neurological ***,this strategy is largely hindered by the difficulty of collecting fresh samples of adult human ***,postmortem brain tissue from both normal and diseased human subjects is more accessible.

关键词： difficulty Diseases Type

Morphology-controlled synthesis of Al/Fe_2O_3 nano-composites via electrospinning

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Chinese Chemical Letters 2015年第12期26卷 1535-1537页

作者： zhen Wang Tian-Fu Zhang zhen ge Yun-Jun Luo School of Materials and Engineering Beijing Institute of Technology

In this article, nano-scale Al/Fe2O3 composites with different morphologies were successfully obtained by a simple electrospinning technique, which is based on a surfactant（polyvinyl pyridine, PVP） in a mixture of N,N-dimethylformamide（DMF） and 2-propanol. The electrospun Al/Fe2O3 composites exhibited a crystal structure and phase composition by X-ray diffraction analysis. The different morphologies of the Al/Fe2O3 composites were also observed through scanning electron microscopy and transmission electron microscopy. It was found that the rather simple electrospinning method used to prepare the morphology-controlled Al/Fe2O3 composites may have the potential for preparation of propellants, explosives, and pyrotechnics in the future.

关键词： surfactant prepare calcination polyvinyl dispersed pyridine attributed metastable fabrication coated

Preparation and characterization of Al/B/Fe_2O_3 nanothermites

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Science China Chemistry 2014年第6期57卷 797-802页

作者： SHEN LianHua LI GuoPing LUO YunJun GAO Kun ge zhen School of Materials and Engineering Beijing Institute of Technology

A sol-gel synthetic approach combined with an ultrasonic method was utilized to prepare Al/B/Fe2O3 *** structure and properties of the prepared nanothermites were characterized by thermogravimetric analysis,differential scanning calorimetry,scanning electron microscopy,X-ray diffraction,and an impact sensitivity *** results verified that the nano-aluminum and the micro-boron were uniformly dispersed in the pores of the iron oxide *** heat of the prepared Al/B/Fe2O3 nanothermites was 1.3 times that of the simple physically mixed *** addition,the heat of the combustion test showed that these materials were indeed ***-scale safe experiments also showed that the prepared materials through sol-gel were relatively insensitive to standard impact.

关键词： sol-gel nanothermites energetic materials properties

Advances and Applications of Brain Organoids

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Neuroscience Bulletin 2023年第11期39卷 1703-1716页

作者： Yang Li Peng‑Ming Zeng Jian Wu zhen‑ge Luo School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China

Understanding the fundamental processes of human brain development and diseases is of great importance for our ***,existing research models such as non-human primate and mouse models remain limited due to their developmental discrepancies compared with *** the past years,an emerging model,the“brain organoid”integrated from human pluripotent stem cells,has been developed to mimic developmental processes of the human brain and disease-associated phenotypes to some extent,making it possible to better understand the complex structures and functions of the human *** this review,we summarize recent advances in brain organoid technologies and their applications in brain development and diseases,including neurodevelopmental,neurodegenerative,psychiatric diseases,and brain ***,we also discuss current limitations and the potential of brain organoids.

关键词： Human pluripotent stem cell Brain organoid Brain development Neurological disease

A comprehensive review of natural products with anti-hypoxic activity

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Chinese Journal of Natural Medicines 2023年第7期21卷 499-515页

作者： LIU Juncai ge zhen JIANG Xiao ZHANG Jingjing SUN Jianan MAO Xiangzhao College of Food Science and Engineering Ocean University of ChinaQingdao 266003China Medical College Qingdao Binhai UniversityQingdao 266555China Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Natural products exhibit substantial impacts in the field of anti-hypoxic *** can cause altitude sickness and other negative effect on the ***,coma,exhaustion,vomiting and,in severe cases,death are some of the clinical ***,hypoxia is no longer just a concern in plateau regions;it is also one of the issues that can not be ignored by urban *** review covered polysaccharides,alkaloids,saponins,flavonoids,peptides and traditional Chinese compound prescriptions as natural products to protect against *** active ingredients,effectiveness and mechanisms were *** related anti-hypoxic mechanisms involve increasing the hemoglobin(HB)content,glycogen content and adenosine triphosphate(ATP)content,removing excessive reactive oxygen species(ROS),reducing lipid peroxidation,regulating the levels of related enzymes in cells,protecting the structural and functional integrity of the mitochondria and regulating the expression of apoptosis-related *** comprehensive summaries are beneficial to anti-hypoxic research and provide useful information for the development of anti-hypoxic products.

关键词： Natural products Anti-hypoxia Mechanism Activity

High thermoelectric properties realized in earth abundant Bi_(2)S_(3) bulk materials via Se and Cl co-doping in solution synthesis process

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Journal of Materials Science & Technology 2022年第5期100卷 51-58页

作者： Jun Guo Yu-Ke Zhu Lin Chen Zi-Yuan Wang zhen-Hua ge Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Bi_(2)S_(3)-based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal ***,low electrical conductivity usually leads to poor electrical transport properties,which seriously restricts their further application in thermoelectric refrigeration and/or power *** this work,Bi_(2)S_(3) with high electrical transport properties is synthesized hydrothermally via Se and Cl *** maximum electrical conductivity value of 483 S cm^(-1) was obtained for the Bi_(2)S_(2.4)Se_(0.4)Cl_(0.20) sample at room *** significant improvement of electrical conductivity gives rise to a high average power factor of 411μW m^(-1) K^(-2) during the measuring temperature range and a peak value of 456μW m^(-1) K^(-2) at 673 *** from the largely improved electrical transport properties,a superior ZT value of approximately 0.66 and *** 0.36 were obtained for Bi_(2)S_(2.4)Se_(0.4)Cl_(0.20),and the theoretically calculated conversion efficiency reached 5.7%.The results indicate that Bi_(2)S_(3) is a promising candidate for thermoelectric applications at medium temperatures.

关键词： Bismuth sulfide Electrical conductivity Doping Thermal conductivity

Synergistically enhanced thermoelectric properties of Bi_(2)S_(3) bulk materials via Cu interstitial doping and BiCl_(3) alloying

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Rare Metals 2022年第3期41卷 931-941页

作者： Jun Guo Zi-Yuan Wang Yu-Ke Zhu Lin Chen Jing Feng zhen-Hua ge Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Bi_(2)S_(3)is composed of inexpensive and environ-mental friendliness elements,which has received extensive interests and been investigated as a promising mid-tempera-ture thermoelectric material for *** pure Bi_(2)S_(3)pos-sesses a high Seebeck coefficient and low thermal conductivity,its low electrical conductivity leads to a lowfigure of merit(ZT)*** this work,Bi_(2)S_(3)fabricated by solid-state melting combined with spark plasma sintering can significantly enhance the thermoelectric performance via introducing small amounts of Cu and BiCl_(3).Cu interstitial doping and Cl substitution on S site result in a large increase in electrical ***,the enhanced phonon scattering is derived from the point defects caused by element doping,the grain boundaries,and the small amount of sec-ondary phase,which leads to the low thermal ***,a high ZT value of 0.7 is obtained at 773 K and reaches a large average ZT of 0.36 in the temperature range from room temperature(RT)to 773 K for the Cu-interstitial-doped and BiCl_(3)-alloyed(Cu_(0.01)Bi_(2)S_(3)+0.175 mol%BiCl_(3))***,the mechanical properties of the Cu_(0.01)Bi_(2)S_(3)+0.175 mol%BiCl_(3)sample are lower than those of other Bi_(2)S_(3)samples,which stem from the weak chemical bonding strength.

关键词： Bismuth sulfide Cu–Cl co-doping Electrical conductivity Mechanical properties

Grafting of Hexafluoropropylene onto Polytetramethylene Glycol by Radical Reaction

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Chinese Chemical Letters 2005年第12期16卷 1600-1602页

作者： zhen ge Xing Yuan ZHANG Jia Bing DAI Xiao Le TAO Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 Hangzhou Zhijiang Silicone Chemicals Co. Ltd. Hangzhou 311203

A well-defined modification of polytetramethylene glycol （PTMG） was realized by radical grafting with hexafluoropropylene （HFP）. The structure of grafted product was confirmed by means of IR, ^1H NMR and ^13C NMR. The effects of the amount of initiator, reaction time and temperature on the grafting HFP onto PTMG were investigated.

关键词： Radical grafting polytetramethylene glycol fluoropolymers