Article
Thermodynamics
Suyong Kim, Averitt A. Johns, John Z. Wen, Sili Deng
Summary: This study reveals the burning structure and propagation mechanism of Al/CuO nanothermites at micron and sub-millimeter scales using high-speed microscopy imaging. The non-uniform burning propagation of nanothermite films is found to be characterized by active burning sites and pre-ignition sites, with active burning propagation in both tangential and normal directions of the propagation front. These findings provide insights into the combustion behavior of nanothermites.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Review
Chemistry, Multidisciplinary
Xiaolong Fu, Yonghu Zhu, Jizhen Li, Liping Jiang, Xitong Zhao, Xuezhong Fan
Summary: Nano-graphene-based energetic materials, as a new type of composite energetic materials, have attracted extensive attention from researchers, due to their potential applications as desensitizers and combustion catalysts. However, there are still some challenges and areas for future research and development to address.
Article
Engineering, Multidisciplinary
Ke-xin Wang, Li-xiao Shen, Bin Yuan, Yan Li, Shun-guan Zhu, Lin Zhang, Zhen-xin Yi, Chen-guang Zhu
Summary: In this study, a spray crystallization method was used to prepare novel energetic nanocomposites by compositing a high-energy metal-organic complex [Ni(CHZ)3](ClO4)2 with nano-aluminum (n-Al). The results showed that the n-Al/[Ni(CHZ)3](ClO4)2 nanocomposites prepared by the spray crystallization method had higher heat release, peak pressure, and pressurization rate, as well as lower sensitivity thresholds to electrostatic discharge (ESD), compared to [Ni(CHZ)3](ClO4)2 alone and physically mixed (PM) n-Al/[Ni(CHZ)3](ClO4)2. These findings demonstrate the significance of introducing energetic metal-organic complexes with high energy into nano-aluminum/energetic metal-organic complexes nanocomposites through the spray crystallization method for improved performance and application.
DEFENCE TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Nathan J. Weeks, Enrique Gazmin, Scott T. Iacono
Summary: Metal powders with nanometer-sized particles can greatly enhance energetic performance due to increased specific surface area. Optimizing the interface between metal fuel and polymer matrix is crucial for achieving maximum weight percent loading of metal nanoparticles.
ACS APPLIED NANO MATERIALS
(2021)
Review
Chemistry, Physical
Mateusz Polis, Agnieszka Stolarczyk, Karolina Glosz, Tomasz Jarosz
Summary: This article introduces the characteristics of thermites and nanothermites, discusses their properties and applications, and explores the preparation methods, research methods, future development directions, and challenges.
Article
Engineering, Multidisciplinary
Yan-jun Yin, Feng Hu, Le-hua Cheng, Xiao-dong Wang
Summary: In this study, a PTFE/Al/CuO organic-inorganic hybrid energetic film was successfully prepared for the first time using electrophoretic deposition. The addition of lithocholic acid as a surfactant enabled PTFE to be charged. The combustion process and energy release of PTFE/Al/CuO were found to be superior to Al/CuO due to the oxidability of PTFE accelerating the redox reaction between Al and CuO. This research sheds light on the preparation of fluoropolymer-containing organic-inorganic hybrid energetic films by one-step electrophoretic deposition.
DEFENCE TECHNOLOGY
(2023)
Review
Chemistry, Multidisciplinary
Vinay Kumar Patel, Amit Joshi, Sanjeev Kumar, Anand Singh Rathaur, Jitendra Kumar Katiyar
Summary: This article reviews the remarkable progress in the field of nanoenergetic materials, discussing key factors affecting combustion properties and the need for a deep understanding of reaction mechanisms. It highlights the evolution in synthesis paths and strategies for optimizing combustion properties, as well as the critical state-of-the-art review conducted on molecular combustion modeling of nanoaluminum and nanoenergetic materials.
Article
Thermodynamics
Yue Jiang, Yujie Wang, Jihyun Baek, Haiyang Wang, Jennifer L. Gottfried, Chi-Chin Wu, Xinjian Shi, Michael R. Zachariah, Xiaolin Zheng
Summary: This work presents a facile method to functionalize the surface of nano-sized aluminum (nAl) particles with perfluoroalkylsilane. The thermochemical and combustion behaviors of perfluoroalkyl-functionalized nAl particles are investigated at different heating rates. The results show that the functionalization improves the thermal stability of nAl particles under slow heating conditions and enhances the ignition and combustion performance under fast heating conditions.
COMBUSTION AND FLAME
(2022)
Article
Physics, Condensed Matter
Priya Thakur, Vimal Sharma, Nagesh Thakur
Summary: In this study, Fe2O3/Al nano-thermite with different weight fractions of multi-layered graphene (MLG) nanoplatelets were synthesized using a physical mixing technique. It was found that increasing the content of MLG in the nano-thermite resulted in higher exothermic enthalpy and lower ignition temperature and activation energy.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Thermodynamics
C. J. Ho, Yen-Chung Liu, Tien-Fu Yang, Mohammad Ghalambaz, Wei-Mon Yan
Summary: The phase change heat transfer of NEPCM particles can significantly enhance heat transfer efficiency at low Reynolds numbers and low heating powers, but its advantage over pure water diminishes at large Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Chemistry, Multidisciplinary
Wei Wang, Ping-Fan Li, Rui Xie, Xiao-Jie Ju, Zhuang Liu, Liang-Yin Chu
Summary: Smart polymeric materials that can respond to environmental stimuli and dynamically adjust their physico-chemical characteristics have gained significant attention in various fields. The combination of micro-/nano-structures and molecular design offers promising opportunities for the development of advanced smart polymeric materials. This review highlights recent progress in the design and fabrication of smart polymeric materials that incorporate micro-/nano-structures and molecular design to achieve desired functions. Various examples, including smart hydrogels, gating membranes, gratings, milli-particles, micro-particles, and microvalves, are discussed, emphasizing the interplay between their micro-/nano-structures and responsive properties for practical applications. The review concludes with perspectives on the current challenges and future opportunities in the development of micro-/nano-structured smart polymeric materials.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Fangxiao Wang, Zelin Liu, Lei Shi
Summary: The g-C3N4/nano-sized ZnO (CZ) composite material was synthesized in CO2-saturated solutions, showing high surface areas for accelerated electron transport and increased catalytic active sites. The developed CZ-2 composite demonstrated exceptional efficiency of 99.9% after 25 minutes and maintained excellent stability after four recycles. This novel synthesis route may inspire the development of high-performance ZnO-based catalysts and expand the applications of ZnO.
Review
Chemistry, Multidisciplinary
Weiqiang Pang, Chongqing Deng, Huan Li, Luigi T. DeLuca, Dihua Ouyang, Huixiang Xu, Xuezhong Fan
Summary: Nano-scale energetic materials have gained significant attention in the fields of propellants and explosives. The preparation of various types of nano-sized energetic materials was carried out and compared with micro-sized materials. The study revealed that nano-sized energetic materials can reduce the sensitivity of solid propellants and explosives.
Article
Materials Science, Multidisciplinary
Nihan Chen, Chunlin He, Siping Pang
Summary: Additive manufacturing (AM), or 3D printing, allows for fast and accurate fabrication of energetic materials with complex structures. Different AM techniques can create high-energy materials with controllable nanostructures and uniformly dispersed ingredients, while retaining their combustion and mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Mohammad Ghalambaz, Haichuan Jin, Amirhossein Bagheri, Obai Younis, Dongsheng Wen
Summary: Nano-encapsulated phase change suspension is a novel functional fluid that utilizes the phase change of nanoparticles for heat transfer. In this study, the natural convection and heat transfer of NEPCMs suspensions along a heated flat surface in a boundary layer are investigated. The results demonstrate that the temperature at which NEPCM particles undergo phase transition is a decisive factor in enhancing heat transfer, with a 25% improvement achievable by adding only 5% of NEPCM particles.
FACTA UNIVERSITATIS-SERIES MECHANICAL ENGINEERING
(2022)