Article
Chemistry, Physical
Sahan D. Perera, Stephen J. Brotton, Haylie Shinsato, Ralf Kaiser, Yuyeol Choi, Kyungsu Na
Summary: The study investigated the oxidation processes of JP-10 fuel droplets with HZSM-5 zeolite and surfactants, as well as the influence of aluminum nanoparticles. Results showed that surfactants and Al NPs improved ignition characteristics, while acidic sites in HZSM-5 were critical for catalytic ignition of JP-10.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
Ivan Antonov, Amandin Chyba, Sahan D. Perera, Andrew M. Turner, Michelle L. Pantoya, Matthew T. Finn, Albert Epshteyn, Ralf I. Kaiser
Summary: This study identified multiple oxidation stages of JP-10 doped with Ti-Al-B-RMNP, providing insights into combustion mechanisms and guiding the development of next-generation RMNP fuel additives.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Energy & Fuels
Ji Mi, Pengfei Jiang, Yitong Dai, Yiran Zhang, Chongkun Shao, Hujun Xie, Yongsheng Guo, Wenjun Fang
Summary: This study investigates the overall thermal-oxidative degradation and deposition process of a typical high-energy-density fuel, exo-tetrahydrodicyclopentadiene (exo-TCD), with the presence of oxygen. The oxidation mechanism of exo-TCD at relatively low temperatures is discussed, along with the potential impact of radical configuration on the oxidation process. In addition, the deposition formation process is analyzed, revealing a three-step mechanism of oxidation, polymerization, and deposition.
Article
Chemistry, Physical
Stephen J. Brotton, Ralf Kaiser
Summary: The study found that a 5% concentration of NO2 does not enhance the ignition of JP-10 fuel containing aluminum nanoparticles, but does reduce the maximum flame temperature. Spectral analysis revealed that NO2 affects the composition of radicals during the oxidation process, leading to changes in the OH radical. Localized heating was able to activate reactions without ignition.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Wenke Wang, Jie Zhao, Dandan Jia, Zhaolin Fu, Enhui Xing, Zhongpeng Zhu, Rui Yan, Zhiping Tao, Yibin Luo, Xingtian Shu
Summary: The study demonstrated that modifying the conventional HY zeolite with Pt can greatly enhance the catalytic stability in isomerizing endo-THDCPD into exo-THDCPD by suppressing coke formation. The lower coke formation over Pt/HY was attributed to the lower amount of coke precursors, which could be hydrogenated by activated H-2 over Pt sites.
Article
Materials Science, Multidisciplinary
Peng Yan, Guifang Zhang, Bing Yi, Alexander Mclean
Summary: In this study, the thermodynamic behavior of phosphorus removal from Si-Fe alloys was investigated using a computational approach. The results provide theoretical basis and separation efficiency for the process of phosphorus removal.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2023)
Review
Acoustics
Zhaochu Yang, Guangcan Yang, Yongqing He, Zhongyuan Shi, Tao Dong
Summary: Fuel droplet evaporation plays a vital role in the generation of flammable mixtures in thermal engines. Traditional techniques involving boundaries to study droplet evaporation, such as suspended wires, can be influenced by their presence. Ultrasonic levitation offers a non-contact and non-destructive alternative to study droplet evaporation without interfering with droplet shape and heat transfer. This review paper explores the effects of acoustic fields on levitated droplets, the evaporation characteristics of acoustically levitated droplets, and the potential limitations of ultrasonic suspension methods for droplet evaporation, providing valuable references for future studies.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Chemistry, Physical
Stephen J. Brotton, Sahan D. Perera, Anupam Misra, N. Fabian Kleimeier, Andrew M. Turner, Ralf Kaiser, Mark Palenik, Matthew T. Finn, Albert Epshteyn, Bing-Jian Sun, Li-Jie Zhang, Agnes H. H. Chang
Summary: The study found that combustion of JP-10 doped with Ti-Al-B reactive metal nanopowders in an oxygen-argon atmosphere can generate gas-phase aluminum and titanium atoms, leading to the formation of aluminum monoxide, titanium monoxide, and other reactive intermediates to facilitate the oxidation of JP-10. The ignition of nanoparticles before JP-10 was supported by spectroscopic analysis and optical ignition videos, indicating the active surface chemistry of RMNPs.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Hongyue Chen, Yongjian Zhang, Heyi Wang, Xin Dong, Duyang Zang
Summary: Controlled buckling of colloidal droplets via acoustic levitation is important in pharmaceutical, coating, and material self-assembly. This study investigated the evaporation process of PTFE colloidal droplets with different particle concentrations under acoustic levitation and observed surface invagination. Higher particle concentration led to invagination on the upper surface, forming a bowl-shaped structure, while lower particle concentration resulted in invagination on both upper and lower surfaces, forming a doughnut-like structure. The hollow cavity on the droplet surface absorbed sound energy and caused positive acoustic radiation pressure, promoting the invagination process.
Article
Chemistry, Physical
Ivan Antonov, Amandin Chyba, Sahan D. Perera, Andrew M. Turner, Michelle L. Pantoya, Matthew T. Finn, Albert Epshteyn, Ralf I. Kaiser
Summary: This study reveals the oxidation behavior of JP-10 droplets doped with Ti-Al-B RMNP using ultrasonic levitator technology and spectroscopic imaging diagnostics. The combustion process involves a glow flame stage and a diffusion flame stage, which can contribute to the development of next-generation RMNP fuel additives with improved payload delivery capabilities.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Energy & Fuels
Danil P. Zarezin, Marina A. Rudakova, Victor I. Bykov, Maxim V. Bermeshev
Summary: Heterogeneous catalysts based on different metal chlorides immobilized on silica gel were prepared and investigated for the isomerization of endo-tetrahydrodicyclopentadiene. The catalyst containing supported AlCl3 showed superior activity and selectivity, while NbCl5 and ZnCl2 immobilized on SiO2 exhibited lower catalytic activity. Optimization of the catalyst system led to high conversion and selectivity in the isomerization reaction.
Article
Chemistry, Multidisciplinary
Maria T. Heilmann, Ricardo G. Simoes, Carlos E. S. Bernardes, Yen Ramisch, Ralf Bienert, Matthias Roellig, Franziska Emmerling, Manuel E. Minas da Piedade
Summary: The study investigated the evaporative crystallization of simvastatin from different solvents and found that different solvents led to different crystallization behaviors. The research also observed a temperature decrease during the evaporation process, which was correlated with solvent volatility.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Thermodynamics
Moritz Buchholz, Johannes Haus, Fritz Polt, Swantje Pietsch, Michael Schoenherr, Frank Kleine Jaeger, Stefan Heinrich
Summary: The investigation and modeling of evaporation rates and particle formation in spray drying processes are usually done through single droplet drying experiments. The solidification processes of suspension drops and resulting evaporation rates in the second drying stages are not fully understood. A systematic approach for empirical model development of drying rates in the first and second drying stages is presented based on a parameter study in an insulated acoustic levitator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Sepehr Mosadegh, Sina Kheirkhah
Summary: The droplet and flame chemiluminescence dynamics and their coupling during atomization events of graphene oxide doped diesel are experimentally investigated. The results show that both the droplet diameter and flame chemiluminescence exhibit intermittent oscillations. The root mean square of the droplet diameter oscillations is positively related to the number and intensity of the atomization events and the graphene oxide doping concentration.
Article
Chemistry, Multidisciplinary
Stephanie H. Jones, Pascal Friederich, D. James Donaldson
Summary: The study found that atmospheric processes such as evaporation and photochemical aging of brown carbon aerosol can cause a red shift in absorbance, leading to a greater overlap with the solar spectrum, which has important implications for the radiative forcing of climate.
ACS EARTH AND SPACE CHEMISTRY
(2021)
