【摘要】 研究硝酸铵表面单分子层自组装膜对硝酸铵晶型转变的影响 ,分析单分子层组装前后硝酸铵表面形貌 ,了解单分子层与硝酸铵相互作用机理 .利用单分子层自组装技术对硝酸铵表面改性 ,用 DSC研究改性硝酸铵晶型的变化 ,用扫描电子显微镜观察了改性硝酸铵颗粒表面的表面形貌 ;用光电子能谱测定了改性硝酸铵的表层结构 .用十八胺 /二甲苯体系包覆的硝酸铵的吸湿率降至纯硝酸铵的 58.6% ;它的 → 相的转变温度 ( 56.0 0℃ )较未包覆的 ( 53.67℃ )明显后移 ,而且 → 相的转变消失 ;颗粒表面变得光滑 ;十八胺分子通过氢键与硝酸铵的 NH+4 相互作用 ,而 CTAB分子通过静电作用力与硝酸铵的 NO-3相互作用 .用单分子层自组装技术改性硝酸铵具有潜在应用价值更多还原

【Abstract】 The effect of the self assembled monolayer on the phase transition of ammonium nitrate was investigated the microscope morphology of the monolayer self assemblying on the surface of ammonium nitrate was analyzed, and the interaction between the monolayer and the ammonium nitrate was understood. The monolayer self assembling method was used to modify the surface of ammonium nitrate with surfactants. The phase transition of the modified ammonium nitrate was studied by differential scan calorimeter. The microscope morphology of the modified ammonium nitrate was observed by scanning electron microscopy. The surface structure of the modified ammonium nitrate was analyzed by virtue of X rays photoelectron spectroscopy. The interaction between the monolayer and the ammonium nitrate was preliminary explained. The sample of ammonium nitrate modified by the system of octadecylamine and dimethyl benzene is the best one. Its hygroscopicity is only 58 6 percents of that of the pure ammonium nitrate. The Ⅲ→Ⅳ phase transition point is 56 00 ℃ for the modified sample, its is higher than that (53 67 ℃) for pure ammonium nitrate. The heat flow peak of phase Ⅱ→Ⅲ almost disappears. The surface of ammonium nitrate particle becomes smooth and is different from the rough surface of pure ammonium nitrate. On the surface, octadecylamine interacts on cation by hydrogen bond, and CTAB interacts on nitrate anion by electrostatic force. It has much potential value to modify ammonium nitrate by monolayer self assembling method.更多还原