Abstract Ammonium nitrate surface is extremely hygroscopic, due to high energy on its surface which increases the potential of the molecules to absorb moisture from the surrounding environment. Ammonium nitrate particles were modified using second coating process with myristic acid in the different amount. The hygroscopicity was tested for ammonium nitrate with and without coating. Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) were used to characterize the surface of coated and uncoated ammonium nitrate. Meanwhile, the method determined mass ratio of coating layer was improved to achieve more accuracy. In addition, focused ion beam technique was used to determine the thickness of coating layer. The results indicated that by using second coating modification method of surfactant adsorption, the anti-hygroscopicity performance of coated samples was significantly improved. The result showed that the decline of the absorption moisture rate was 40.57%, and the mass ratio of the coating layer was 1.42%. These results suggest that the second coating process employed could provide the well fundamental for the further anti-hygroscopic surface modification of ammonium nitrate particles coated by surfactants.

中文翻译：

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表面活性剂包覆硝酸铵（NH4NO3）的抗吸湿表面改性

摘要 硝酸铵表面具有极强的吸湿性，这是由于其表面的高能量增加了分子从周围环境中吸收水分的潜力。硝酸铵颗粒使用不同量的肉豆蔻酸使用二次包衣工艺进行改性。测试有涂层和无涂层的硝酸铵的吸湿性。傅里叶变换红外 (FTIR) 和扫描电子显微镜 (SEM) 用于表征涂层和未涂层​​硝酸铵的表面。同时，改进了确定涂层质量比的方法，以达到更高的精度。此外，聚焦离子束技术用于确定涂层的厚度。结果表明，采用表面活性剂吸附的第二种涂层改性方法，涂层样品的抗吸湿性能显着提高。结果表明，吸湿率下降40.57%，涂层质量比为1.42%。这些结果表明所采用的第二种包衣工艺可以为表面活性剂包衣的硝酸铵颗粒的进一步抗吸湿表面改性提供良好的基础。