A novel chemical suppressant (PA@NH₂-MCM41) was synthesized via self-assembly. NH₂-MCM-41 was prepared using diatomaceous earth (DE) as the silica source. FTIR spectra showed that phytic acid (PA) was successfully grafted onto synthesized NH₂-MCM-41 via hydrogen bonding. The highly ordered mesoporous structure of PA@NH₂-MCM41 was observed from TEM and small angle X-ray diffraction (SAXRD). The effectiveness of PA@NH₂-MCM41 in the suppression of nano-Al dust explosions was investigated. Experimental results suggested that the addition of PA@NH₂-MCM41 could effectively reduce the average flame propagation velocity (V_avg) and maximum explosion pressure (P_max). After the addition of 16.7 wt% PA@NH₂-MCM41, the V_avg of the gas-phase flame was reduced by 75%. With addition of 28.6 wt% PA@NH₂-MCM41, the P_max of nano-Al dust decreased by 65.7%. As the mass fraction of PA@NH₂-MCM41was increased to 33.3%, nano-Al dust explosion was completely suppressed. The SEM, FTIR and EDS results showed that a complex sealing film was formed on the surface of the explosion products, which occupied the open sites on the Al surface and thereby interrupted the Al evaporation and surface reaction. Subsequently, the suppression mechanism by which phosphorus containing suppressants consume free radicals and the interaction of PA molecules with the aluminum particle surface were revealed in depth.

通过自组装合成了一种新型的化学抑制剂（PA @ NH ₂ -MCM41）。NH ₂ -MCM-41是使用硅藻土（DE）作为二氧化硅源制备的。FTIR光谱表明，植酸（PA）通过氢键成功地接枝到合成的NH ₂ -MCM-41上。通过TEM和小角X射线衍射（SAXRD）观察到PA @ NH ₂ -MCM41的高度有序的介孔结构。研究了PA @ NH ₂ -MCM41在抑制纳米铝粉尘爆炸中的有效性。实验结果表明，PA @ NH ₂ -MCM41的加入可以有效降低平均火焰传播速度（V _avg）和最大爆炸压力（P _max）。加入16.7重量％的PA @ NH ₂ -MCM41后，气相火焰的V _avg降低了75％。加入28.6 wt％的PA @ NH ₂ -MCM41，纳米Al粉尘的P _max降低了65.7％。作为PA @ NH ₂的质量分数-MCM41增加到33.3％，纳米铝粉尘爆炸被完全抑制。SEM，FTIR和EDS结果表明，爆炸产物表面形成了复杂的密封膜，占据了Al表面的空旷位置，中断了Al的蒸发和表面反应。随后，深入揭示了含磷抑制剂消耗自由基的抑制机理以及PA分子与铝颗粒表面的相互作用。