MODELING HEAT-INDUCED CHEMICAL REACTION IN NANOTHERMITES EXCITED BY PULSE LASER: A HOT SPOT MODEL

Yajing Peng 1 Yinghui Wang 2 Bruno Palpant 3 Xing He 2 Xianxu Zheng 4
1 Center for Condensed Matter Science and Technology
2 Center for Condensed Matter Science and Technology
3 LPQM - Laboratoire de Photonique Quantique et Moléculaire
4 Laboratory for Shock Wave and Detonation Physics Research
Abstract : A hot spot model, involving interaction of pulse laser with nanoparticles where heat diffusion and exothermic chemical reaction are considered and spread out of heat and chemical reaction, is developed to model the thermal reaction dynamic process of Al/NC (nitrocellulose) nanothermites excited by pulse laser for the purpose of verifying the experimental ablation criterion proposed recently and providing a microscopic insight into different physical pathways leading to ablation. In this model, the spatial position and conversion of matters taking place in chemical reactions are regarded as the functions of time, space, and temperature. An exact expression of power density absorbed by nanoparticles in matrix is incorporated to calculate the diameters of chemical reaction region. Calculation results justify experimental ablation criterion, and show that thermal decomposition mechanism predominates the nanosecond pulse-excited process before ablation but it is not suitable for the 100 ps regime which is qualitatively attributed to shock pressure. The effects of pulse duration and nanoparticle size on ablation threshold are examined.
Keywords : ot spot thermal decomposition chemical reaction nanothermites modelin Hot spot modeling
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Journal articles
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Submitted on : Wednesday, June 12, 2013 - 6:27:51 PM
Last modification on : Thursday, June 7, 2018 - 5:40:03 PM

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Yajing Peng, Yinghui Wang, Bruno Palpant, Xing He, Xianxu Zheng. MODELING HEAT-INDUCED CHEMICAL REACTION IN NANOTHERMITES EXCITED BY PULSE LASER: A HOT SPOT MODEL. International Journal of Modern Physics B, World Scientific Publishing, 2010, 24 (3), pp.381-395. ⟨10.1142/S0217979210055135⟩. ⟨hal-00833478⟩

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