Article
Engineering, Environmental
Lixiao Shen, Yan Li, Lin Zhang, Shunguan Zhu, Zhenxin Yi, Chenguang Zhu
Summary: Experiments were conducted on Al-Si alloy-thermites with different Si content (12 wt% and 20 wt%) to regulate the energy release process. The introduction of silicon significantly stabilized the combustion process and enhanced the heat release and ignition performance of Al-Si/CuO composites.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mechanics
Runzhe Kan, Jianxin Nie, Zheng Liu, Qingjie Jiao, Xiaole Sun, Xueyong Guo, Shi Yan, Yanli Zhu
Summary: This paper analyzes the underwater explosion shockwave characteristics of a new generation of aluminized explosives and proposes a non-ideal explosive underwater explosion shockwave model. The results show that the non-ideal behavior of aluminized explosives makes the shockwave energy of underwater explosion more sensitive to the Al/O ratio.
Article
Optics
Abba Saleh, Piotr Ryczkowski, Goery Genty, Juha Toivonen
Summary: Real-time monitoring of flue gas parameters in combustion processes is crucial for improving process efficiency and reducing pollutant emissions. This study demonstrates simultaneous measurement of water vapor temperature and concentration in an industrial boiler using a broadband lidar, achieving excellent agreement with reference measurements. By utilizing backscattering from aerosol particles, the study also maps the water vapor concentration profile in the boiler, offering new perspectives for 3D profiling of temperature and gas concentration in industrial environments.
Article
Engineering, Multidisciplinary
Jun-peng Liu, Hao-rui Zhang, Qi-Long Yan
Summary: The easy sintering characteristic of aluminum nanoparticles limits their application in solid propellants. Coating the nanoparticles with fluoropolymer can effectively improve their combustion performance. Through reactive molecular dynamics simulations, a comparative study was conducted to investigate the inhibitory effect of the coating layer on sintering and the promotion of complete combustion of particles. Rating: 8 points
DEFENCE TECHNOLOGY
(2023)
Article
Thermodynamics
Emelian Tichtchenko, Alain Esteve, Carole Rossi
Summary: This study provides a computational analysis of the reaction between fully-dense layered aluminum and copper oxide systems, incorporating a 2D nonstationary model with oxygen and aluminum diffusion. The model successfully reproduces the spatial dependency of reaction front progression rate on fuel concentration, as well as the inverse evolution of flame front width with reaction front velocity. Additionally, a method to estimate heat loss due to vaporization of reactants and products was proposed, and microscopic fluctuations in reaction front velocity were observed for different activation energies before quenching.
COMBUSTION AND FLAME
(2021)
Article
Materials Science, Multidisciplinary
Nikifor Rakov, Simone A. Vieira, Anderson S. L. Gomes
Summary: A series of Tm/Yb:SrF2 fluoride powders were fabricated by combustion synthesis for optical temperature sensing, showing good performance and promising prospects for applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Polymer Science
Sherif Elbasuney, Gharieb S. El-Sayyad, Shukri Ismael, M. Yehia
Summary: Nanothermites exhibit vigorously-exothermic reactions and enhanced reaction rates at nanoscale. The integration of oxide NPs with aluminium NPs in TNT can significantly improve its destructive effect, with CuO/Al mixture offering the highest increase at 35%. The low ignition temperature and high oxygen release rate of nanoscopic CuO/Al play a crucial role in this enhancement.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2021)
Article
Engineering, Chemical
Daolun Liang, Zizhan Wu, Yangxu Jiang, Ke Ren, Mingyue Zhou, Sheng Chu, Dekui Shen
Summary: Four samples of nanofluid fuel with different concentrations of aluminum and oleic acid were prepared and their stability and combustion characteristics were investigated. The results showed that the addition of oleic acid improved the stability of the samples and resulted in better ignition and combustion performance. Increasing the solids' concentration also had a positive effect on the performance of the samples, but excessive concentration decreased the overall combustion efficiency.
Article
Materials Science, Multidisciplinary
Dongxu Zhang, Jiahui Shi, Bidong Wu, Rui Zhu, Jinqiang Zhou, Yunyan Guo, Chongwei An, Jingyu Wang
Summary: In this study, copper/aluminum microspheres with good combustion performance were prepared using droplet microfluidic technology and binder. The microspheres had regular spherical morphology and uniform particle size distribution, and the crystal form of each particle was not destroyed by microfluidic technology. The introduction of copper promoted the thermal decomposition of high energy microdroplets and reduced the mechanical sensitivity of the prepared microspheres. The copper/aluminum microspheres exhibited excellent and stable combustion performance, and the addition of copper increased the combustion speed compared to the microspheres only containing nano aluminum. This technology represents an inexpensive and simple way to improve on existing aluminized explosives.
MATERIALS & DESIGN
(2023)
Article
Engineering, Multidisciplinary
Jacek Wojtas, Mateusz Szala
Summary: TE-FTIR is a new method used for examining the thermal stability of energetic materials. Testing on three melt-cast explosives revealed different decomposition behaviors and stability levels, providing a potential new parameter for characterization of thermal stability in explosives. This method offers the possibility of developing compact and portable tools for rapid testing of explosives in field conditions.
Article
Materials Science, Multidisciplinary
Yueting Wang, Ji Dai, Jianbing Xu, Yun Shen, Cheng-ai Wang, Yinghua Ye, Ruiqi Shen
Summary: The experimental and theoretical results indicate that gas flow seepage is a critical factor affecting the heat transfer process of Al/CuO nano-thermite in burn tubes, leading to a decrease in propagation velocity with increasing charge density. Introducing a certain amount of NC into the component can improve reactivity and increase gas production and pressurization capacity, significantly enhancing the propagation velocity of Al/CuO nanothermite under constraint conditions. Additionally, the increase in relative heat loss with decreasing tube diameter is the main reason for the decrease in propagation velocity, and the dimensionless parameter theta can be used to analyze the heat loss coefficient under different charge diameters.
Article
Medicine, General & Internal
Thomas Holder, Frances Sophie Woodley Hooper, David Yates, Zion Tse, Samadhan Patil, Ahmed Moussa, Lucy Batten, Vignesh Radhakrishnan, Mark Allison, Catherine Hewitt, Ada Keding, Greg Forshaw, Vijay Jayagopal
Summary: During the COVID-19 pandemic, non-contact infrared thermometry (NCIT) was widely used for body temperature screening. However, limited data and standardisation existed regarding the accuracy of these devices. This study compared the measurements from infrared (IR) thermography, IR tympanic thermometry, and IR gun thermometry with SpotOn core-body temperature, and found poor agreement between all IR devices and SpotOn measurements.
Article
Materials Science, Multidisciplinary
Haibo Xu, Gongxun Bai, Kun He, Shixu Tao, Zhanling Lu, Yang Zhang, Shiqing Xu
Summary: This study successfully synthesizes NIR phosphor LaGaO3: Nd/Cr with excellent temperature sensing performance and anti-thermal quenching performance. The prepared NIR pc-LED shows good performance in terms of photoelectric conversion efficiency and NIR output power. By using the prepared NIR pc-LED as a light source, the distribution of blood vessels and bones in human palms can be observed.
MATERIALS TODAY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Shi Li, Tao Guo, Miao Yao, Wen Ding, Jialin Chen, Jiaxing Song, Sheng Zhang, Rui Zhu
Summary: The addition of potassium perchlorate (KClO4) was found to enhance the performance of Al/Bi2O3 nano thermites, with the highest heat release observed at 10 wt% KClO4 and the lowest activation energy at 30 wt% KClO4. This study provides a method to increase heat release or reduce activation energy by controlling the amount of added KClO4.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Analytical
Guotao Xiang, Xiaotong Liu, Qing Xia, Xiuchong Liu, Su Xu, Sha Jiang, Xianju Zhou, Li Li, Dan Wu, Li Ma, Xiaojun Wang, Jiahua Zhang
Summary: An approximately monochromatic red upconversion emission was achieved in NaScF4: Yb3+/Er3+ nanoparticles by doping Mn2+ ions, which acted as bridges during the energy transfer process, leading to a significant acceleration of the red UC enhancement. The sample with 10% Mn2+ ions exhibited the strongest red luminescence and enabled ultrasensitive optical thermometry in the physiological temperature region.
Article
Energy & Fuels
Michael N. Bello, Michelle L. Pantoya, Keerti Kappagantula, William S. Wang, Siva A. Vanapalli, David J. Irvin, Leslie M. Wood
Article
Thermodynamics
Dylan K. Smith, Jesus Cano, Michelle L. Pantoya, Keerti Kappagantula
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2017)
Article
Materials Science, Composites
Lakin N. Phillips, Keerti S. Kappagantula, Jason P. Trembly
POLYMER COMPOSITES
(2019)
Article
Materials Science, Multidisciplinary
Pragnya Kunchala, Keerti Kappagantula
MATERIALS & DESIGN
(2018)
Article
Nanoscience & Nanotechnology
Nicholas A. Clayton, Keerti S. Kappagantula, Michelle L. Pantoya, Sharon C. Kettwich, Scott T. Iacono
ACS APPLIED MATERIALS & INTERFACES
(2014)
Article
Chemistry, Multidisciplinary
Yahya A. Al-Majali, Clive T. Chirume, Eric P. Marcum, Damilola A. Daramola, Keerti S. Kappagantula, Jason P. Trembly
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2019)
Article
Automation & Control Systems
Tianhao Wang, Piyush Upadhyay, Md Reza-E-Rabby, Xiao Li, Lei Li, Ayoub Soulami, Keerti S. Kappagantula, Scott Whalen
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Tianhao Wang, Lei Li, Madhusudhan R. Pallaka, Hrishikesh Das, Scott Whalen, Ayoub Soulami, Piyush Upadhyay, Keerti S. Kappagantula
Summary: Friction Stir Interlocking (FSI) is a process used for joining dissimilar materials with different properties by combining friction stir welding with mechanical interlocking using a third body interlock. Through microstructural characterization and lap shear tensile testing, it was found that FSI joints effectively joined carbon fiber reinforced polymer and AZ31 magnesium alloy sheets. Finite element analysis was conducted to simulate different FSI configurations, with simulation results showing good agreements with experimental data in terms of load-displacement curves and fracture paths of CFRP.
MATERIALS & DESIGN
(2021)
Article
Engineering, Manufacturing
Xiao Li, Chen Zhou, Nicole Overman, Xiaolong Ma, Nathan Canfield, Keerti Kappagantula, James Schroth, Glenn Grant
Summary: The study demonstrates the successful fabrication of bulk void-free copper-carbon composite wires with homogenized carbon dispersion using friction extrusion method. Reductions in both copper grain size and carbon particle size were achieved, leading to improvements in thermal capacity and density of the composite wire.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Metallurgy & Metallurgical Engineering
Tianhao Wang, Scott Whalen, Xiaolong Ma, Joshua Silverstein, Hrishikesh Das, Madhusudhan R. Pallaka, Angel Ortiz, Timothy Roosendaal, Piyush Upadhyay, Keerti S. Kappagantula
Summary: A new friction-based riveting technique, Rotating Hammer Riveting (RHR), is capable of forming complete AZ31 Mg rivet heads in a very short time without the need for pre-heating. By refining the grain structure, this technique improves the formability of Mg rivets and eliminates corrosion pathways.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Keerti S. Kappagantula, Jacob A. Smith, Aditya K. Nittala, Frank F. Kraft
Summary: This study presents a novel approach of enhancing the electrical conductivity of 3D metal composites by adding graphene in minute quantities (15 ppm). The research demonstrated that composites with low defect density graphene showed improved electrical conductivity with increasing graphene content, while those with high defect density graphene exhibited lower electrical conductivity. Further advancements in this area are crucial for the development of high-performance composite conductors for more efficient energy transport.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Rajib Kalsar, Xiaolong Ma, Jens Darsell, Dalong Zhang, Keerti Kappagantula, Darrell R. Herling, Vineet V. Joshi
Summary: In this study, fully consolidated dense 5 mm rods of AA7075 alloy were produced using Friction Extrusion (FE) technique, resulting in the formation of fine equiaxed grains and uniformly distributed precipitates. The optimized microstructure led to reduced solutionizing temperature and time, and improved strength and ductility of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
William Frazier, Bharat Gwalani, Julian Escobar, Joshua Silverstein, Keerti S. Kappagantula
Summary: A finite difference method was used to explore the impact of graphene on the bulk electrical conductivity of copper-graphene composites. It was found that high-conductivity grain boundaries arising from graphene can increase the bulk electrical conductivity, while the difference in textures between copper and copper-graphene composites may not have a significant effect on conductivity.
TMS 2022 151ST ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS
(2022)
Proceedings Paper
Engineering, Mechanical
Tianhao Wang, Scott Whalen, Piyush Upadhyay, Keerti Kappagantula
MAGNESIUM TECHNOLOGY 2020
(2020)