Article
Polymer Science
Ibrahim Dubdub, Mohammed Al-Yaari
Summary: Plastic waste generation has increased significantly over the past 70 years, with more than 50% of municipal plastic waste being composed of PS, PP, and LDPE products. A kinetic model has been developed to describe the thermal decomposition of plastic mixtures, contributing to efficient plastic waste management. Different isoconversional models were used to obtain kinetic parameters, with Coats-Redfern model being the most suitable for determining reaction mechanisms.
Article
Energy & Fuels
Hemant Kumar Balsora, S. Kartik, Thomas J. Rainey, Ali Abbas, Jyeshtharaj Bhalchandra Joshi, Abhishek Sharma, Anand Gupta Chakinala
Summary: This study aimed to investigate the pyrolysis kinetics of agricultural biomass residues using thermogravimetric analysis. Various methods were employed to estimate the activation energy and model the kinetics. The results provided insights into the reaction orders and kinetic models in different temperature zones for the biomass residues.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Physical
Kh. Nazaretyan, S. Aydinyan, H. Kirakosyan, D. Moskovskikh, A. Nepapushev, K. Kuskov, M. Tumanyan, A. Zargaryan, R. Traksmaa, S. Kharatyan
Summary: In this study, novel AlCo-rich AlCoNiFe and AlCoNiFeCr high entropy alloys were successfully prepared and their formation range was predicted by thermodynamic modeling. The factors influencing their formation mechanism and thermal stability were investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Alexei Kangash, Damaris Kehrli, Pavel Maryandyshev, Alain Brillard, Viktor Lyubov, Jean-Francois Brilhac
Summary: This study analyzes the impact of high moisture contents in Russian peat samples on their combustion behavior. The research finds that the influence of high moisture contents on the combustion behavior of wet peat samples can be considered negligible under low heating rates. However, following the Russian standards to limit the moisture content of peat samples below 52% can reduce the energy required for the drying process.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Engineering, Chemical
Frank C. De Lucia, Steven W. Dean, Jennifer L. Gottfried
Summary: In this study, we used nanosecond laser pulses to rapidly heat aluminum powders and analyzed the oxidation process by monitoring AlO emission. The results showed that nanoscale aluminum powders released energy at a faster rate, as indicated by the increased shock velocities.
Article
Materials Science, Multidisciplinary
Sangram Mazumder, Mangesh Pantawane, Narendra B. Dahotre
Summary: The study examined the effect of non-isothermal treatment and isothermal treatment on the formation of oxides on IN718 alloy, revealing the presence of NiO on non-isothermally treated samples and the presence of both NiO and Fe-oxides on isothermally treated samples. The duration and method of heat treatment were found to influence the evolution of oxides in the samples.
NPJ MATERIALS DEGRADATION
(2021)
Article
Energy & Fuels
Chunlong Jiang, Haobo Bi, Zhanshi Ni, Hao Sun, Hao Shi, Qizhao Lin
Summary: This paper studied the combustion process of nano-aluminum in different atmospheres and temperatures using thermogravimetric analysis and a combustion experiment platform. It was found that there is no discernible difference in the combustion process of nAl in the air and CO2 atmospheres under the temperature programmed condition. The combustion process was divided into three stages, with the oxidation process concentrating primarily in the second and third stages. The greater the concentration of oxygen, the better the combustion effect. The ignition delay time was greatly reduced as the ambient temperature increased from 900 degrees C to 1000 degrees C. The combustion product was detected using XRD, and the content of alpha-Al2O3 increased with increasing temperature.
Article
Thermodynamics
M. K. Zakaryan, Kh. T. Nazaretyan, S. V. Aydinyan, S. L. Kharatyan
Summary: The mechanism and kinetics of nickel oxide reduction by Mg + C combined reducer at non-isothermal conditions were studied at high heating rates. The utilization of the combined reducer showed a significant reduction in the reduction temperature of nickel oxide and exhibited a synergetic effect in the ternary mixture. Activation energy values for the reactions were determined to be 185 +/- 15 kJ mol(-1) and 195 +/- 15 kJ mol(-1).
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Materials Science, Multidisciplinary
Wang Yunlei, Ren Liping, Dong Jingren, Cao Chuanchuan, Liu Xun, Jiang Pan
Summary: Based on electron backscattered diffraction and grain growth model, this study investigates the grain sizes and growth thermo-kinetics of high-voltage anode aluminum foil during annealing with different heating rates. The results provide the grain growth exponent, activation energy, and rate constant, and explain the rapid growth of (001) oriented grains.
RARE METAL MATERIALS AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Eric N. Coker, Burl Donaldson, Walter Gill, Nadir Yilmaz, Francisco M. Vigil
Summary: The isothermal oxidation behavior of high purity aluminum sheet in air was investigated using TGA/DSC. The oxidation rates and extents were found to be temperature-dependent and non-linear. The oxidation process showed different characteristics at various temperatures, including induction period and passivation. The morphology and properties of the oxidized samples were also examined by SEM.
APPLIED SCIENCES-BASEL
(2023)
Article
Green & Sustainable Science & Technology
A. Z. Zhuk, V. I. Borzenko, E. A. Buzoverov, P. P. Ivanov, E. I. Shkolnikov
Summary: This paper compares the technical and economic aspects of hydrogen production methods using water electrolysis and hydrothermal oxidation of aluminum. It demonstrates that aluminum-water technology is competitive with electrolysis when the cost of electricity is below 0.02 USD/kWh, and specifies conditions for optimal hydrogen generation using aluminum.
Article
Energy & Fuels
A. M. Ribeiro, E. Ramalho, M. P. Neto, R. M. Pilao
Summary: Thermogravimetric techniques were used to study the thermal degradation of high-density cork granules. The main components of cork degrade mainly between 220°C and 525°C, and lignin continues to decompose up to 900°C. Activation energies were calculated using two isoconversional methods, with values aligning with data from other lignocellulosic biomass.
Article
Engineering, Chemical
Frank C. De Lucia, Lily Giri, Rose A. Pesce-Rodriguez, Chi-Chin Wu, Steven W. Dean, Trenton M. Tovar, Rosario C. Sausa, Elliot R. Wainwright, Jennifer L. Gottfried
Summary: This study characterized nine commercial aluminum powders using various methods and found that they were more heterogeneous than expected in terms of particle size distributions and impurities. Manufacturer specifications were not always accurate for the specific sample lots investigated. A combination of multiple techniques provided a clearer picture of the powder properties. Thorough characterization of aluminum powders is necessary before interpreting experimental results to avoid contradictory findings.
Article
Energy & Fuels
K. S. Reddy, N. Pradeep
Summary: The study focuses on using concrete as a filler material to improve the performance of the thermal energy storage system, analyzing the stability of the thermocline under different Reynolds numbers.
Article
Materials Science, Multidisciplinary
Shane Q. Arlington, Tobias Neuhauser, Markus Short, Karsten Woll, David A. LaVan, Gregory M. Fritz, Timothy P. Weihs
Summary: Reactive nanolaminates are energetic materials with heterogeneous microstructures that undergo self-propagating exothermic reactions to form stable compounds. This study investigates the phase formation in Al/Zr/C reactive nanolaminates under different heating rates using nanocalorimetry, synchrotron X-ray diffraction, and ex situ analyses. The results reveal that high heating rates or quenching from high temperatures are required to produce the desired ZrC + Al cermet phases.
MATERIALS & DESIGN
(2023)
Article
Thermodynamics
Siva Kumar Valluri, Mirko Schoenitz, Edward Dreizin
Summary: Composite powders of boron with bismuth or cobalt fluoride were prepared by arrested reactive milling and studied for combustion behavior. It was found that the composite particles burned faster than elemental boron in air, but exhibited a single-stage combustion pattern. In flame combustion, the composite powders burned more slowly but in a similar single-stage manner, with reduced light emission suggesting lower temperatures.
COMBUSTION SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Kerri-Lee Chintersingh, Mirko Schoenitz, Edward L. Dreizin
Summary: This study prepared composite powders containing metal additives with boron using high energy mechanical milling, and conducted combustion experiments to analyze their performance. The results showed that adding Hf significantly accelerated combustion, while adding Fe improved the burn rate in air with no clear advantage in other oxidizing environments. Using acetonitrile and stearic acid as PCA for preparing B-Fe composites resulted in greater refinement of iron and stronger acceleration in the burn rates of the prepared powders particles in air.
COMBUSTION SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Kerri-Lee Chintersingh, Mirko Schoenitz, Edward L. Dreizin
Summary: The combustion characteristics of boron powders with varying purity, surface treatment, and iron dopant loadings were investigated. It was found that higher purity boron particles burn faster, and coating boron with iron can increase both burn rate and temperature.
COMBUSTION SCIENCE AND TECHNOLOGY
(2021)
Review
Engineering, Multidisciplinary
Elif Irem Senyurt, Mirko Schoenitz, Edward L. Dreizin
Summary: This article reviews different experimental methods addressing the decomposition of gasified DIMP, revealing major early decomposition products and the need for revised reaction kinetics due to different product sequences at varying heating rates. Plasma produced in a corona discharge was reported to lead to rapid DIMP decomposition at low temperatures, with distinct decomposition products from high-temperature reactions.
DEFENCE TECHNOLOGY
(2021)
Article
Thermodynamics
Siva Kumar Valluri, Mirko Schoenitz, Edward L. Dreizin
Summary: Micron-sized nanocomposite powders containing different metal fluorides were prepared, and their reactions upon heating were studied. Fluorination accelerated oxidation and reduced ignition temperature. The reaction mechanisms varied for different fuels and oxidizers.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Elif Irem Senyurt, Edward L. Dreizin
Summary: A simplified heat and mass transfer model is used to predict thermal runaway of burning metal particles in an oxidizing gas. The model takes into account transition transport phenomena important for particles with sizes comparable to the mean free path of gas molecules. Different fuels like aluminum, magnesium, and boron are considered, with varying reaction kinetics and thermal accommodation coefficient values influencing the predicted results.
COMBUSTION AND FLAME
(2022)
Article
Nanoscience & Nanotechnology
Hicham Jabraoui, Alain Esteve, Mirko Schoenitz, Edward L. Dreizin, Carole Rossi
Summary: This theoretical work investigates the influence of nanopores at CuO-Al nanothermite interfaces on the initial stage of thermite reaction using ReaxFF molecular dynamics simulations. The presence of a pore significantly affects the growth kinetics and composition of the alumina layer, impacting the initiation properties of the nanothermite.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Energy & Fuels
Mehnaz Mursalat, Mirko Schoenitz, Edward L. Dreizin
Summary: Spherical boron powders were prepared by ball milling and their combustion performance was compared with irregularly-shaped milled and commercial powders. The results showed that ball milling shifted the onset of boron oxidation to lower temperatures and finer spherical powders exhibited higher initial oxidation rates and combustion activity.
Article
Chemistry, Applied
Mehnaz Mursalat, Holly McCann, Mirko Schoenitz, Edward L. Dreizin
Summary: In this study, solid pellets were prepared using aluminum-boron composite powders of different shapes. It was found that pellets made from spheroidal powders exhibited the highest strength without any binder, and also showed a delayed oxidation exotherm compared to the blended starting materials.
JOURNAL OF ENERGETIC MATERIALS
(2022)
Article
Thermodynamics
Purvam M. Gandhi, Mirko Schoenitz, Edward L. Dreizin
Summary: Metal-oxidizer nanocomposites have gained attention as potential gas-generating energetic materials that can replace or enhance CHNO compounds in certain applications. Experimentalists have used enclosed chambers to ignite metal-based energetic materials and report pressures. However, direct comparison of the reported pressures is difficult due to differences in chamber volume and mass. A parameter proportional to the released energy is proposed to harmonize experimental data, and calculations suggest that some nanothermites and ammonium nitrate-based energetic materials have achieved their theoretical performance levels. Furthermore, the calculations show that ammonium nitrate is a superior oxidizer compared to ammonium perchlorate.
COMBUSTION AND FLAME
(2023)
Article
Chemistry, Multidisciplinary
Ella V. Ivanova, Ashvinkumar Vasudevan, Elif Irem Senyurt, Mirko Schoenitz, Alexei F. Khalizov, Edward L. Dreizin, Gennady Y. Gor
Summary: In this study, experimental measurements and computational predictions were used to determine the surface tension values of DMMP and DIMP. The accuracy of the predictive method was validated by the agreement between the computational predictions and experimental results. Additionally, the surface tension values of sarin were also obtained using this method and compared with literature data. These findings are significant for predicting the formation and evolution of aerosols made of these chemicals.
Article
Thermodynamics
Purvam Mehulkumar Gandhi, Jonathan McNanna, Mirko Schoenitz, Edward L. Dreizin
Summary: Composite powders of boron and potassium nitrate (PN) with different particle shapes were prepared by milling with and without an emulsion as process control agent. The spherical powders showed more homogeneous mixing between boron and PN. The spherical composite powders exhibited lower ignition temperatures, lower activation energies for ignition, shorter ignition delays, and greater rates of pressure rise compared to irregularly-shaped powders.
COMBUSTION AND FLAME
(2023)
Article
Chemistry, Applied
Siva Kumar Valluri, Lawrence Salvati, Edward L. Dreizin, Dana D. Dlott
Summary: Metal/oxidizer composites have the potential to release more energy than organic explosives, but their slow energy release makes them unsuitable for high-performance explosives. Through arrested reactive milling (ARM), metal composite microparticles with internal pores were produced to facilitate rapid shear mixing of fuel and oxidizer under shock compression. By evaluating the thermal emission and ignition behavior of the composites, it was found that internal porosity can be engineered to increase the chemical reactivity of metal/oxidizer composites.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
Article
Chemistry, Applied
Siva Kumar Valluri, Lawrence Salvati III, Edward L. Dreizin, Dana D. Dlott
Summary: Metal/oxidizer composites are generally not suitable for high-performance explosives due to slow energy release, but internal porosity can be engineered to increase their chemical reactivity under shock.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
