镍纳米粉的比表面积和孔结构研究

采用阳极弧放电等离子体方法制备了高纯镍纳米粉,利用X射线衍射(XBD)、透射电子显微镜(TEM)对粉末的形貌、晶体结构、粒度进行了表征。样品的N_2的吸附-脱附等温线采用静态表面吸附仪在液氮温度下(78 K)在气体饱和蒸气压力范围内测试。依据BJH理论模型计算探讨了样品的累积孔表面积、累积孔体积、孔径及其BJH脱附分布等性能。用图解法由等温吸附直线求出单层吸附量,利用BET吸附公式计算出样品的比表面积。结果表明,镍纳米粉的比表面积为14.23 m~2/g,粒径为46 nm。

Characterization of Specific Surface Area and Pore Structure of Nickel Nano-particles

The pure nickel nano-particles are prepared by anodic arc discharging plasma method. The product is characterized by X - ray diffraction (XRD), transmission electron microscopy (TEM) to determine the morphology, crystal microstrueture, particle size and size distribution. The N2 absorption - desorption isotherm of the samples at liquid nitrogen temperature (78K) and gas saturation vapor tension range are measured by ASAP 2010 static volumetric absorption analyzer. Based on the BJH academic model, the property of the cumulative pore specific surface area, cumulative pore volume, average pore diameter and BJH desorption pore distribution curves of the samples are calculated by BJH analysis method. By using the absorption isotherm and illustration method, the single layer adsorption capacity can be obtained, the specific surface area of the sample can be calculated from the BET adsorption equation. The results show that the specific surface are and the size of nickel nano-particles are 14. 23m2/g and 46 nm.