In much the same way that the use of silicondid in the 1970s,leadingto the modern information technology industry, the development of advanced functional nanomaterials will fuel many of the emerging industries that will address energy, healthcare, and environmental challengesas well as those inother areas. Therefore, a currentchallengein the...
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June 2021 (v1)Book sectionUploaded on: December 4, 2022
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November 26, 2023 (v1)Conference paper
For three decades, significant research efforts have been devoted to thermites and nanothermites using different metal/metal oxide combinations and custom nanostructured architectures. Unlike explosives, these energy-dense materials undergo a rapid deflagration driven by a carbon free oxidation-reduction reaction, which forms stable reaction...
Uploaded on: June 3, 2023 -
June 2021 (v1)Journal article
This article provides a computational analysis of the reaction of fully-dense layered aluminum and copper oxide systems. After the detailed presentation of the 2D nonstationary model implementing both oxygen and aluminum diffusion, the propagation of the reaction front in an Al/CuO thin film was studied. The model qualitatively reproduces the...
Uploaded on: December 4, 2022 -
November 26, 2023 (v1)Conference paper
In recent years, it has been reported that adding titanium into reactive thermite composites (such as Al/I 2 O 5 , B/CuO) can improve their combustion efficiency and lower their ignition temperature. However, these authors were only able to point out the complexity of the mechanisms governing ternary thermites reactivity but failed to answer...
Uploaded on: October 11, 2023 -
April 26, 2023 (v1)Conference paper
Recently, it has been reported that adding titanium into thermite composites can improve their combustion efficiency and lower their ignition temperature. However, the exact role of Ti reaction in such thermites is still unclear. Here, we put focus on in-depth understanding the reaction mechanism of Ti-based thermite by employing...
Uploaded on: October 11, 2023 -
2023 (v1)Journal article
The paper elucidates the main driving mechanisms at play during the early stage of the Ti/CuO thermite reaction using reactive forcefields in the frame of molecular dynamics calculations.
Uploaded on: April 20, 2023 -
September 2018 (v1)Journal article
The association of a metallic fuel (usually aluminum) with an oxidizer (metal oxide or organic compound) creates an exothermic material that can be ignited with an external stimulus such as local heating or spark discharge. These materials with high energetic performances, called nanothermites, have been used to release temperature or pressure...
Uploaded on: December 4, 2022 -
September 2022 (v1)Journal article
This paper reports on the mechanisms of CuO decomposition and its associated phase transformation into Cu2O, as a fundamental step of thermite materials reaction, where CuO serves as the oxidizer. Frenkel pair defects in perfect bulk CuO show extremely high formation energy (>4 eV) indicating that its decomposition initiates at...
Uploaded on: December 4, 2022 -
January 2019 (v1)Journal article
A model based uniquely on condensed phase reactions coupled with the thermal equation is developed to study the initiation and early stage of the redox reaction in Al/CuO nanothermites. It considers the effect of a wetting contact angle between Al and CuO particles, which may be induced by sintering mechanisms and/or the synthesis method. In...
Uploaded on: December 4, 2022 -
August 23, 2023 (v1)Report
This manuscript deals with the combustion of nanothermites in a closed volume. A firststudy was focused on the combustion of aluminium particles with gaseous oxygen. Afterdetailed the reaction mechanisms implemented, the numerical integration of a combustioncode on PYTHON was done. To observe the main condensed and gaseous behaviors, afirst c...
Uploaded on: November 25, 2023 -
November 26, 2023 (v1)Conference paper
We developed a triggerable ultimate security device capable of physically destroying a memory chip that contains classified data, within a few milliseconds, upon the detection of intrusion.
Uploaded on: June 16, 2023 -
February 2022 (v1)Journal article
Novel properties associated with nanothermites have attracted great interest for several applications, including lead-free primers and igniters. However, the prediction of quantitative structure-energetic performance relationships are still challenging. This study investigates machine learning methods as tools to surrogate complex physical...
Uploaded on: December 3, 2022 -
November 26, 2017 (v1)Conference paper
Traditional technologies used to manufacture current pyrotechnic switches are based on synthesis, pressing/casting and injection of macroscopic organic energetic materials (explosive or highly energetic materials), which leads to bulky and dangerous systems. We propose, instead, a nanothermite-based safety switch, which provides a compact...
Uploaded on: February 28, 2023 -
November 26, 2023 (v1)Conference paper
Due to the growing appetite for developing compatible miniaturized micropyrotechnics systems, the traditionally used electro-pyrotechnic initiators have been upgraded from a bridge wire to a semiconductor bridge (SCB) via microelectromechanical systems (MEMS) technology. As an innovative ignition device, SCB can generate heat and plasma upon an...
Uploaded on: October 11, 2023 -
April 2018 (v1)Journal article
Pyroswitches and circuit breakers play an important safety role in electrical systems. A miniature one-shot circuit breaker based on the violent reaction of a nanothermite is presented for safety application as protection against overcurrent, external perturbation and short circuit of a broad range of equipment and systems. This device consists...
Uploaded on: February 27, 2023 -
November 26, 2023 (v1)Conference paper
Unary nanoscale metallic fuels such as Al, Ti, Mg, Zr, and B with an oxidizer have been massively explored in reactive energetic formulations commonly used in explosives and propellants owing to their high combustion energy. While Al has routinely been preferred, its low melting point and the resultant sintering effects curtail the reaction...
Uploaded on: March 9, 2024 -
February 4, 2025 (v1)Journal article
Aluminum has demonstrated compelling attributes over decades of research, encompassing affordability, abundance and a high specific energy density when utilized as a fuel in energetic materials such as nanothermites. However, combustion performance of Al suffers from its high ignition point and sintering tendency, the latter being hypothesized...
Uploaded on: February 23, 2024 -
2024 (v1)Journal article
Automated pre-impact fall detection in real-time using raw data acquired from wearable sensors, such as tri-axial accelerometers, remains an open research problem in the context of elderly care. This paper presents a comparative study of nine neural network models, including Dense, CNN, LSTM, GRU, BiLSTM, BiGRU, CNN Dense, CNN LSTM, and CNN...
Uploaded on: February 25, 2024 -
September 11, 2024 (v1)Publication
The discovery and optimization of materials still remains a significant challenge when dealing with a very large feature space, limited data, and, if the experiments and/or calculations are expensive to perform. This paper presents intelligent sampling methods designed to guide experiments or computations towards user-defined specific regions,...
Uploaded on: October 3, 2024 -
May 2021 (v1)Journal article
Hydrogen and its interaction with metal oxide surfaces is of major importance for a wide range of research and applied fields spanning from catalysis, energy storage, microelectronics, to metallurgy. This paper reviews state of the art of first principles calculations on the well-known ruthenium oxide (RuO2) surface in its (110) orientation and...
Uploaded on: December 3, 2022 -
November 2018 (v1)Report
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Uploaded on: December 4, 2022 -
July 2021 (v1)Journal article
This paper describes a kinetic model dedicated to thermite nanopowder combustion,in which core equations are based on condensed phase mechanisms only. We explore all combinations of fuels/oxidizers, namely Al, Zr, B/CuO, Fe2O3, WO3, and Pb3O4, with 60 % of thetheoretical maximum density packing, at which condensed phase mechanisms govern the...
Uploaded on: December 4, 2022 -
November 26, 2017 (v1)Conference paper
Energetic materials are the only attractive sources of " dormant " energy, enjoying long shelf life (decades), that can deliver quick on-demand bursts of energy in the form of heat and/or pressure. Among the large variety of energetic materials, reactive nanocomposites, based on exothermic thermite reactions, have attracted great attention over...
Uploaded on: February 28, 2023 -
April 28, 2020 (v1)Patent
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Uploaded on: December 4, 2022 -
October 2020 (v1)Journal article
The paper reports a joint experimental/theoretical study on the aging of reactive Al/CuO nanolaminates, investigating both structural modifications and combustion properties of aged systems. We first show theoretically that the long-term storage (over several decades) in ambient temperature marginally affects nanolaminates structural properties...
Uploaded on: December 4, 2022