SDS/APG改性纳米氢氧化镁的合成及其性能研究

Study on Synthesis and Modification of Magnesium Hydroxide Nanoparticles Via Mixed Surfactant Precipitation Method

采用易于工业化的液相沉淀法,在十二烷基硫酸钠(SDS)和烷基多苷(APG)复配溶液的协同作用下,合成了收率98%左右的改性纳米氢氧化镁。通过沉降体积法,N2吸附,X射线衍射,红外光谱,透射电镜等手段对样品进行了表征分析,结果表明所得样品分散性好,结晶度高。相对于未改性样品,改性样品(复配表面活性剂质量比1∶1,添加量0.2%)的沉降百分含量提高了31.2%,比表面积增大了10.62 m2/g,堆密度降低了0.150 g/mL。通过机理探讨,发现SDS和APG可能以单分子层或双分子层形式吸附到样品表面,它们主要依靠长碳链的空间位阻效应影响晶核微粒的团聚,从而得到分散性优良的片状样品。

The surface modified nano-sized magnesium hydroxide was synthesized by mixed surfactant wet precipitation method（SDS and APG as modification） and yield is about 98%.The attained samples were characterized by sediment volume,N2 adsorption,X-ray diffraction,fourier transform infrared spectroscopy,transmission electron microscope.The experimental results show that the samples synthesized have good dispersion and crystal.Compared with the unmodified sample,when mass ratio of SDS and APG is 1 ∶1and 0.2% mix surfactant is added,sediment volume percent increases by 31.2%,surface area increases by 10.62 m2/g,and Bulk density declines by 0.150 g/mL.It is discovered that SDS and APG maybe adsorb the surface of sample via odd molecular or double molecular in order to arrest conglomeration of crystal and good dispersion sample is obtained.