一步沉淀法制备表面疏水性纳米氢氧化镁

Synthesis of Hydrophobic Magnesium Hydroxide Nanoparticles through One-step Precipitation Process

以油酸为改性剂,采用化学沉淀法一步制备了表面疏水性的氢氧化镁纳米粒子,研究了合成条件对氢氧化镁团聚和形态的影响。XRD证明所制备的氢氧化镁纯度高,平均晶粒尺寸为16nm;FT-IR表明油酸分子已键合在纳米氢氧化镁表面;TEM显示,所制备的纳米氢氧化镁表面形态呈针状或片状,在甲苯中分散性好。计算得到制备的纳米氢氧化镁活化指数可达98.9%,粒子表面呈疏水性。

The hydrophobic magnesium hydroxide [Mg（OH）2] nanoparticles were synthesized through onestep precipitation process with oleic acid （C17H35COOH, OA） as surface modifier. The in-fluence of synthesis parameters on the morphology characteristics of magnesium hydroxide nanoparticles was studied, such as the amount of oleic acid,mixing rate and reaction temperature. The crystal habit of the nanoparticles was characterized by X-ray diffraction （XRD）. Based on the Fourier transform infrared spectroscopy （FTIR） and the transmisson electron microscope （TEM）, the OA molecules are bonded onto the surface of Mg （OH）2 nanoparticles with a stable chemical bond, and the that Mg （OH）z nanoparticles exhibited a needle-like morphology or lamella-like morphology and good dispersion property in toluene. The floating test proved that the surface of Mg （OH）2 nanoparticles become hydrophobic, and the active index of this nanoparticle attains 98.9%.