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Combustion characteristic and aging behavior of bimetal thermite powders

Defence Technology（防务技术） 2021年第3期17卷 755-762页

作者： Hong-qi Nie Hay Yee Chan Sreekumar Pisharath huey hoon hng Energetics Research Institute Nanyang Technological UniversitySingapore

Nanothermites have been employed as fuel additives in energetic formulations due to their higher energy density over CHNO energetics. Nevertheless, sintering and degradation of nanoparticles significantly limit the practical use of nanothermites. In this work, combustion characteristic and aging behavior of aluminum/iron oxide(Al/Fe2O3) nanothermite mixtures were investigated in the presence of micron-scale nickel aimed to produce bimetal thermite powders. The results showed that the alumina content in the combustion residue increased from 88.3% for Al/Fe2O3 nanothermite to 96.5% for the nanothermite mixture containing 20 wt% nickel. Finer particle sizes of combustion residue were obtained for the nanothermite mixtures containing nickel, indicative of the reduced agglomeration. Both results suggested a more complete combustion in the bimetal thermite powders. Aging behavior of the nanothermite mixture was also assessed by measuring the heat of combustion of the mixture before and after aging process. The reduction in heat of combustion of nanothermite mixtures containing nickel was less severe as compared to a significant decrease for the nanothermite mixture without nickel, indicating better aging resistance of the bimetal thermite powders.

关键词： Nanothermite Bimetal Combustion efficiency Aging Thermochemical calculations

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Effects of nano-sized aluminum on detonation characteristics and metal acceleration for RDX-based aluminized explosive

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Defence Technology（防务技术） 2021年第2期17卷 327-337页

作者： Dan-yang Liu Pin Zhao Serene Hay-Yee Chan huey hoon hng Lang Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China School of Materials Science and Engineering Nanyang Technological University639798Singapore

Nano-sized aluminum(Nano-Al)powders hold promise in enhancing the total energy of explosives and the metal acceleration ability at the same ***,the near-detonation zone effects of reaction between Nano-Al with detonation products remain *** this study,the overall reaction process of 170 nm Al with RDX explosive and its effect on detonation characteristics,detonation reaction zone,and the metal acceleration ability were comprehensively investigated through a variety of experiments such as the detonation velocity test,detonation pressure test,explosive/window interface velocity test and confined plate push test using high-resolution laser *** fluoride(LiF),which has an inert behavior during the explosion,was used as a control to compare the contribution of the reaction of aluminum.A thermochemical approach that took into account the reactivity of aluminum and ensuing detonation products was adopted to calculate the additional energy release by *** the numerical simulations based on the calculated afterburn energy and experimental results,the parameters in the detonation equation of state describing the Nano-Al reaction characteristics were *** study found that when the 170 nm Al content is from 0%to 15%,every 5%increase of aluminum resulted in about a 1.3%decrease in detonation *** pressure gauge measurement showed no significant enhancement in detonation *** detonation reaction time and reaction zone length of RDX/Al/wax/80/15/5 explosive is 64 ns and 0.47 mm,which is respectively 14%and 8%higher than that of RDX/wax/95/5 explosive(57 ns and 0.39 mm).Explosive/window interface velocity curves show that 170 nm Al mainly reacted with the RDX detonation products after the detonation *** the recording time of about 10 ms throughout the plate push test duration,the maximum plate velocity and plate acceleration time accelerated by RDX/Al/wax/80/15/5 explosive is 12%and 2.9 ms higher

关键词： Nano-sized aluminum Detonation reaction zone Explosive metal acceleration Thermodynamic equilibrium calculation Laser interferometry

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Accurate machine learning models based on small dataset of energetic materials through spatial matrix featurization methods

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Journal of Energy Chemistry 2021年第12期30卷 364-375,I0009页

作者： Chao Chen Danyang Liu Siyan Deng Lixiang Zhong Serene Hay Yee Chan Shuzhou Li huey hoon hng School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

A large database is desired for machine learning(ML) technology to make accurate predictions of materials physicochemical properties based on their molecular *** a large database is not available,the development of proper featurization method based on physicochemical nature of target proprieties can improve the predictive power of ML models with a smaller *** this work,we show that two new featurization methods,volume occupation spatial matrix and heat contribution spatial matrix,can improve the accuracy in predicting energetic materials' crystal density(ρ_(crystal)) and solid phase enthalpy of formation(H_(f,solid)) using a database containing 451 energetic *** mean absolute errors are reduced from 0.048 g/cm~3 and 24.67 kcal/mol to 0.035 g/cm~3 and 9.66 kcal/mol,*** leave-one-out-cross-validation,the newly developed ML models can be used to determine the performance of most kinds of energetic materials except *** ML models are applied to predict ρ_(crystal) and H_(f,solid) of CHON-based molecules of the 150 million sized PubChem database,and screened out 56 candidates with competitive detonation performance and reasonable chemical *** further improvement in future,spatial matrices have the potential of becoming multifunctional ML simulation tools that could provide even better predictions in wider fields of materials science.

关键词： Small database machine learning Energetic materials screening Spatial matrix featurization method Crystal density Formation enthalpy n-Body interactions

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Superior wide-temperature lithium storage in a porous cobalt vanadate

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Nano Research 2020年第7期13卷 1867-1874页

作者： Haoliang Chen Dan Yang Xueye Zhuang Dong Chen Weiling Liu Qi Zhang huey hoon hng Xianhong Rui Qingyu Yan Shaoming Huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China

Lithium ion batteries(LIBs)that can be operated under extended temperature range hold significant application *** in this work,we successfully synthesized Co2V2O7 electrode with rich porosity from a facile hydrothermal and combustion *** applied as anode for LIBs,the electrode displayed excellent stability and rate performance in a wide range of ***,a stable capacity of 206 mAhg 1 was retained after cycling at a high current density of 10 A·g-1 for 6,000 cycles at room temperature(25℃).And even when tested under extreme conditions,i.e.,-20 and 60℃,the battery still maintained its remarkable stability and rate *** example,at-20℃,a capacity of 633 mAh·g 1 was retained after 50 cycles at 0.1 A·g 1;and even after cycling at 60℃ at 10 A·g-1 for 1,000 cycles,a reversible capacity of 885 mAh·g-1 can be *** believe the development of such electrode material will fciliate progress of the next-generation LIBs with wide operating windows.

关键词： lithium-ion battery anode material cobalt vanadate porous structure wide-temperature performance

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High-Power and High-Energy-Density Flexible Pseudocapacitor Electrodes Made from Porous CuO Nanobelts and SWCNTs

High-Power and High-Energy-Density Flexible Pseudocapacitor ...

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2011中国材料研讨会

作者： huey hoon hng School of Materials Science and Engieering Nanyang Technological University School of Materials Science and Engineering Nanyang Technological University

We reported that flexible peudocapacitor electrodes with high energy density and high power density could be made from porous CuO nanobelts using single wall carbon nanotubes （SWCNTs） pellets as the current *** porous CuO nanobelts were synthesized by a one-step hydrothermal *** porous CuO nanobelts showed large surface area （128 m 2 /g） and were polycrystalline with extremely small crystal grains （e.g.3-5 nm）.This led to their high capacitances and stable cycling performances when tested as pseudocapacitor electrodes in the organic electrolyte （1.0 M LiPF 6 in 1:1 w/w ethylene carbonate/diethyl carbonate）,e.g.128 F/g after 1000 cycles at a current density of 1 A/g in the potential range of 0 to 2.5 V *** different current densities,series of high energy densities,e.g.130.2 W h/kg,92 W h/kg,44 W h/kg,25 kWh/kg and 20.8 W h/kg,were obtained for different power densities,e.g.1.25 kW/kg,6.25 kW/kg,25 kWh/kg and 50 kWh/kg,***/SWCNTs flexible hybrid electrodes were made from these porous CuO nanobelts using the SWCNTs pellets as the current *** flexible electrodes showed lower average specific capacitances when we included the total mass of the CuO nanobelts and SWCNTs current ***,the average specific capacitances of the CuO/SWNCNTs flexible electrodes were still much higher than that of electrodes made of pure *** example,we obtained effective specific capacitances of ＞62 F/g for the hybrid electrodes after 1000 cycles in the above-mentioned organic electrolyte at a current density of 5 A/g in the potential range of 0 to 2.5 V *** while the electrodes made of pure SWCNTs showed specific capacitance of only 23.6 F/g under the same testing conditions

关键词： CuO porous nanobelt pseudocapacitor

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Synthesis of Porous NiO Nanocrystals with Controllable Surface Area and Their Application as Supercapacitor Electrodes

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Nano Research 2010年第9期3卷 643-652页

作者： Xiaojun Zhang Wenhui Shi Jixin Zhu Weiyun Zhao Jan Ma Subodh Mhaisalkar Tuti Lim Maria Yanhui Yang Hua Zhang huey hoon hng Qingyu Yan School of Materials Science and Engineering Nanyang Technological University639798Singapore College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000China Energy Research Institute Nanyang Technological University637459Singapore School of Civil and Environmental Engineering Nanyang Technological University639798Singapore School of Life Sciences and Chemical Technology Ngee Ann Polytechnic535 Clementi RoadSingapore School of Chemical and Biomolecular Engineering Nanyang Technological University637459Singapore

We report a facile way to grow various porous NiO nanostructures including nanoslices,nanoplates,and nanocolumns,which show a structure-dependence in their specific charge *** formation of controllable porosity is due to the dehydration and re-crystallization of β-Ni(OH)_(2) nanoplates synthesized by a hydrothermal *** analysis shows that the decomposition temperature of the β-Ni(OH)_(2) nanostructures is related to their *** electrochemical tests,the porous NiO nanostructures show stable cycling performance with retention of specific capacitance over 1000 ***,the formation of nanocolumns by the stacking of β-Ni(OH)_(2) nanoslices/plates favors the creation of small pores in the NiO nanocrystals obtained after annealing,and the surface area is over five times larger than that of NiO nanoslices and ***,the specific capacitance of the porous NiO nanocolumns(390 F/g)is significantly higher than that of the nanoslices(176 F/g)or nanoplates(285 F/g)at a discharge current of 5 A/*** approach provides a clear illustration of the process-structure-property relationship in nanocrystal synthesis and potentially offers strategies to enhance the performance of supercapacitor electrodes.

关键词： Ni(OH)_(2) NiO porous nanocrystals supercapacitor

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Assembled Sb2Te3 Nanoparticles by Vapor Transport growth with Enhanced Thermoelectric Properties

Assembled Sb2Te3 Nanoparticles by Vapor Transport growth wit...

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中国化学会第27届学术年会

作者： huey hoon hng Freddy Yin Chang Boey 颜清宇 Majid Kabiri Samani George Chung Kit School of Materials Science and Engineering Nanyang Technological University (NTU) 50 Nanyang Avenue School of Electrical and Electronic Engineering Nanyang Technological University

＜正＞Nanostructured thermoelectric semiconductors represent a promising new direction that can further increase energy conversion efficiency, which requires the realization of thermoelectric nanocrystals with size

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Eff ects of nano-sized aluminum on detonation characteristics and metal acceleration for RDXbased aluminized explosive

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Defence technology 2021年第2期

作者： Dan-yang Liu Pin Zhao Serene Hay-Yee Chan huey hoon hng Lang Chen

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