Article
Chemistry, Physical
Xijin Wang, Zhitao Liu, You Fu, Yao Zhu, Ling Chen, Jing Yang, Qian Chen, Bin Xu, Feiyun Chen, Xin Liao
Summary: In this study, a series of RDX@PDA@TiO2 double layer core-shell energetic composites were successfully constructed to reduce the sensitivities of RDX. Thicker and larger particle size of the amorphous TiO2 shell led to better desensitization effect, indicating a potential alternative method for improving the vulnerability and transportation safety of RDX.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Emily A. Ryan, Zach D. Seibers, John R. Reynolds, Meisha L. Shofner
Summary: Thermoplastic polymers have great potential for space exploration applications due to their versatile mechanical properties and compatibility with different processing methods. However, their low electrical conductivity limits their use in critical space applications. By studying the microstructural evolution of electrically conductive surface-localized nanocomposites, we can produce durable conductive materials with varying surface structures and high conductivity, expanding the use of polymers in space applications.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhenzhan Yan, Li Yang, Jimin Han, Wenchao Tong
Summary: In this study, spherical carbon-based lead azide composites were prepared by using graphene oxide, lead acetate, and polyvinyl alcohol as precursor materials. The excellent thermal and electrical conductivity of the graphene sheet resulted in reduced electrostatic sensitivity and increased flame sensitivity of LA/C/GA. The performance of LA/C/GA was found to be better than previously reported materials.
Article
Engineering, Environmental
Zaira Alibay, Dylan J. Kline, Miles C. Rehwoldt, Prithwish Biswas, Steven Herrera, Haiyang Wang, Michael R. Zachariah
Summary: This study investigates spatially localized remote ignition of additively manufactured composites through microwave absorption, finding that ignition delay decreases with increasing power until reaching a saturation region where ignition sensitivity is limited by combustion kinetics. It was discovered that Ti nanoparticles oxidize with O2 at lower temperatures than PVDF fluorination, driving combustion in the process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Sherly Novia Sari, Pawel Nieroda, Pawel Pasierb
Summary: The poor chemical stability and unsatisfactory electrical conductivity of BaCeO3-based protonic conductors can be improved by doping, forming solid solutions, or creating composite materials. This study focuses on the development of BaCe0.9Y0.1O3 - (Ba-Ce-Y-Si-P-O) composites using the latter approach. The sintering method and the presence of a modifier phase were found to significantly affect the phase composition, crystallographic structure, microstructure, and electrical properties, with only a minor increase in electrical conductivity observed in samples sintered using the Spark Plasma Sintering method.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Ling Chen, Qiang Li, Xijin Wang, Jianwei Zhang, Guozhen Xu, Xiang Cao, Jie Liu, Fengqiang Nan, Weidong He
Summary: In this paper, a novel nanocomposite energetic material RDX@NGEC was successfully synthesized using electrostatic spraying technology, and its thermal decomposition properties and sensitivity were systematically investigated. The results showed that NGEC was uniformly coated on the surface of RDX, resulting in a significant reduction in particle size and sensitivity. Therefore, this novel nanocomposite energetic material holds potential applications in propellants and explosives.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Physics, Applied
Ju Hwan (Jay) Shin, Min Zhou
Summary: This study focuses on the response of composites consisting of high-explosive crystals and a polymeric binder under electrostatic excitation. The distributions of induced electric field vector and mechanical stress in the microstructures are examined, along with the effects of crystal-binder volume fraction, crystal size, and dielectric constants. The research suggests that controlled dielectric breakdown can be used to facilitate hotspot formation within energetic materials.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Aerospace
Daniel L. Caplan, David L. Blunck
Summary: Decreasing pressure results in faster movement and lower peak temperatures of spark kernels, while average temperatures increase. Higher pressures lead to higher energy levels in spark kernels, while lower pressures result in decreased energy levels.
JOURNAL OF PROPULSION AND POWER
(2022)
Article
Chemistry, Physical
Andrei Novitskii, Illia Serhiienko, Sergey Novikov, Kirill Kuskov, Daria Pankratova, Tatyana Sviridova, Andrei Voronin, Aleksei Bogach, Elena Skryleva, Yuriy Parkhomenko, Alexander Burkov, Takao Mori, Vladimir Khovaylo
Summary: BiCuSeO is a promising layered oxygen-containing compound for thermoelectric applications, but its low electrical conductivity limits its potential. This paper explores dual doping and scalable synthesis routes to enhance its thermoelectric performance. Bi1-xSmxCuSeO samples were synthesized with a reactive sintering process, demonstrating increased electrical conductivity and decreased Seebeck coefficient.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Katherine C. Opacich, Timothy M. Ombrello, Joshua S. Heyne, Joseph K. Lefkowitz, Robert J. Leiweke, Kenneth Busby
Summary: New methods using nanosecond-pulsed high-frequency discharges (NPHFD) for energy deposition have shown promise in igniting fuel-lean conditions. Results comparing NPHFD ignition to conventional capacitive discharge systems under matching energy and power conditions showed that decreasing NPHFD power while maintaining total energy deposited allowed for greater kernel growth aided by flow advection, though at the cost of longer transition time to self-propagating flame.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Materials Science, Ceramics
Steven M. Smith, Lun Feng, William G. Fahrenholtz, Gregory E. Hilmas, Laura Silvestroni
Summary: The thermal and electrical properties of TiB2 ceramics were significantly affected by the addition of varying amounts of CrB2, showing a decrease in thermal diffusivity, an increase in anisotropy in thermal expansion coefficients, and a decrease in electrical conductivity with increasing Cr content.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Computer Science, Information Systems
Michelangelo Balmelli, Raphael Farber, Laura Merotto, Patrik Soltic, Davide Bleiner, Christian M. Franck, Juergen Biela
Summary: This study investigates the influence of pulse shape and rise rate on breakdown voltage, finding that under pulsed discharge, the breakdown voltage is always higher than the static breakdown voltage. The probability of pulsed discharge breakdown increases with higher pulse amplitudes and durations, and the delay time between static and actual breakdown voltages decreases with increasing overvoltage. The pulse rise rate should be high for ignition purposes, and a short pulse duration is recommended for reduced electrode erosion.
Article
Chemistry, Multidisciplinary
Livio Gamba, Justin A. A. Lajoie, Travis R. R. Sippel, Ethan B. B. Secor
Summary: In this study, a nanoscale Al/CuO thermite system was patterned using a multi-material aerosol jet printing technology. The effect of printhead design on microstructure and mixing between materials during printing was analyzed. The high-resolution patterning capability of aerosol jet printing was utilized to fabricate blended thermites and antennas, which exhibited rapid and low-energy ignition when exposed to an electromagnetic field. The versatility of this approach was demonstrated by manufacturing compositionally graded samples, showing the potential for in situ manufacturing of energetic and electromagnetic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Pallavi Dhama, Aparabal Kumar, P. Banerji
Summary: This study investigates the structural and thermoelectric properties of In Se-4(3), a thermoelectric material with layered structure, and its variable In4Se3-x. It is found that the presence of Se-vacancy in In4Se3-x enhances the power factor and reduces the lattice thermal conductivity, resulting in an improved thermoelectric figure of merit.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Chaur-Yang Chang, Kuo-Hsiung Tseng, Jui-Tsun Chang, Meng-Yun Chung, Zih-Yuan Lin
Summary: This study developed an energy-enhanced micro-electric discharge machining system for preparing nano-tungsten colloids. The colloids prepared using this system exhibited better performance compared to those prepared using chemical methods.
