摘要：采用易于工业化的液相沉淀法,在石油磺酸盐的作用下,合成改性纳米氢氧化镁。通过沉降体积实验确定改性剂的最佳用量为0.2%(质量分数)。通过X射线衍射(XRD)、透射电镜(TEM)、N₂吸附、堆密度分析等手段对改性前后样品进行表征分析。结果表明:改性后样品分散性好,结晶度高。红外光谱(FT-IR)和沉降实验结果表明:该方法可以使改性剂吸附在氢氧化镁颗粒表面,使氢氧化镁表面由亲水性变成亲油性,可提高氢氧化镁在有机介质中的分散稳定性。

关键词： 纳米材料；氢氧化镁；改性

Abstract：The surface modified nano-sized magnesium hydroxide was synthesized by wet precipitation method using the petroleum sulfonate as surface modifiers. The yield of the surface modified Mg（OH）₂ nano-particles was about 98%。 The optimum dosage of modifying agent was 0.2% of the mass of sodium hydroxide， which was confirmed by sedimentation volume experiments. The unmodified and modified samples were characterized by X-ray diffraction （XRD）， transmission electron microscope （TEM）， N₂adsorption， tap density test， respectively. The experimental results showed that the modified samples had good dispersion and crystal. Fourier transform infrared spectroscopy （FT-IR） and the sedimentation volume experiments results suggested that the mixed surfactants were adsorbed onto the surface of Mg （OH）₂ nano-particles changing the hydrophilic surface into hydrophobic and improving the dispersion stability in organic medium. 

Keywords：nanometer materials； magnesium hydroxide； modification