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High-energy Al/graphene oxide/CuFe2O4 nanocomposite fabricated by self-assembly: Evaluation of heat release, ignition behavior, and catalytic performance
Energetic Materials Frontiers Pub Date : 2021-02-13 , DOI: 10.1016/j.enmf.2021.01.005
Jinghua Wang , Jingjing Wang , Shaojie Wang , Hui Li , Qilong Yan , Kangzhen Xu

As part of our ongoing search for high-performance nanoenergetic materials, we herein used self-assembly guided by negatively charged graphene oxide (GO) to fabricate a high-energy Al/GO/CuFe2O4 nanocomposite with a dense layered structure featuring evenly mixed Al and CuFe2O4 nanoparticles uniformly loaded on the GO surface. Investigation of the effects of the equivalence ratio (Φ ​= ​1.00–1.75) showed that the heat release achieved at the optimal value of Φ ​= ​1.50 (3175 ​± ​65 ​J·g−1) exceeded that of most known thermites, while the fierce ignition process of this composite was characterized by an ignition delay time of (0.025 ​± ​0.002) s, a flame propagation speed of (14.3 ​± ​3.8) m·s−1, and a continuous reaction duration of (33 ​± ​0.58) ms. In addition, the nanocomposite with Φ ​= ​1.00 effectively catalyzed the thermal decomposition of 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) and ammonium perchlorate (AP), decreasing their decomposition temperatures by 7.4 and 64.8 ​°C, respectively, reducing their apparent activation energies of decomposition by 118.7 and 18 ​kJ·mol−1, respectively. And the constant-volume combustion enthalpies of RDX and AP increase with the addition of Al/GO/CuFe2O4. The reason of this enhanced performance was probed by analyzing the nanocomposite assembly process, and a plausible assembly mechanism was proposed.



中文翻译:

通过自组装制备的高能Al /氧化石墨/ CuFe 2 O 4纳米复合材料:散热,点火行为和催化性能的评估

作为我们不断寻求的高性能纳米能量材料的一部分,我们在本文中使用了带负电的氧化石墨烯(GO)引导的自组装技术,以制造出高能量的Al / GO / CuFe 2 O 4纳米复合材料,该复合材料具有均匀分布的致密层状结构混合的Al和CuFe 2 O 4纳米颗粒均匀地负载在GO表面上。对当量比(Φ  = 1.00-1.75)的影响的研究表明,在Φ  = 1.50(3175±65 J·g -1)的最佳值下实现了放热)超过了最著名的铝热剂,而这种复合材料的剧烈着火过程的特征在于着火延迟时间为(0.025±0.002)s,火焰传播速度为(14.3±3.8)m·s -1且连续反应持续时间为(33±0.58)ms。此外,Φ  = 1.00的纳米复合材料可有效催化1,3,5-三硝基过氢-1,3,5-三嗪(RDX)和高氯酸铵(AP)的热分解,将其分解温度降低7.4和64.8 °C分别将其表观分解活化能分别降低118.7和18 kJ·mol -1。随着Al / GO / CuFe 2 O 4的加入,RDX和AP的等体积燃烧焓增加。。通过分析纳米复合材料组装过程探讨了这种性能提高的原因,并提出了合理的组装机理。

更新日期:2021-04-19
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