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• W4308742493 endingPage "140170" @default.
• W4308742493 startingPage "140170" @default.
• W4308742493 abstract "• Novel hypergols with H 2 O 2 -HAN oxidizer formulations were prepared and evaluated. • Top performing hypergol showed ID time of 4 ms with HAN-H 2 O 2 , even at −40 °C. • Stability of 15 N-labeled HAN in H 2 O 2 was studied by multinuclear NMR and DSC. • Based on UV-vis and EPR studies, a mechanism of hypergolic reaction was proposed. • Ignition and combustion studies were conducted using a custom-made hybrid motor. Development of fully green hybrid propulsion systems, in which both the oxidizer and the fuel are environmentally benign, while having a desirable performance under in-space conditions, is a formidable challenge. Herein, we present new air-stable solid propellants capable of exhibiting hypergolic ignitions with commercially available H 2 O 2 (70%) and its low-freezing formulation containing hydroxylammonium nitrate (HAN). A top performing Janus-type fuel 15 showed remarkable ignition delay time of 4 ms with HAN-H 2 O 2 formulation, even at −40 ℃. The Janus-type design approach allowed modulation of the ignition delay times by varying the carbon chain-length, the type of the used transition metals and the molecular structure of the resulted solid fuels. Studies of HAN and related salts formulations with H 2 O 2 allowed us to get an insight into the reasons of the stability of HAN-H 2 O 2 formulations. UV-vis and EPR monitoring of selected fuels reactions with oxidizers, as well as surface wettability measurements, provided a valuable information related to the better understanding of the hypergolic reaction mechanisms, which should contribute to the design of the next generation of green hypergolic propulsion systems. We also successfully tested fuel 15 in a custom-made small-scale static hybrid motor system, injecting H 2 O 2 in a sequence of pulse or in continuous flow modes." @default.
• W4308742493 created "2022-11-15" @default.
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• W4308742493 date "2023-02-01" @default.
• W4308742493 modified "2023-09-26" @default.
• W4308742493 title "Janus-type hypergolic fuels for hybrid systems using hydrogen peroxide and hydroxylammonium nitrate-based oxidizers" @default.
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• W4308742493 doi "https://doi.org/10.1016/j.cej.2022.140170" @default.
• W4308742493 hasPublicationYear "2023" @default.
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