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为了从样品的微观结构方面解释各种吸气剂吸附量的大小,利用ASAP2010型物理吸附仪,在77 K下对其进行高纯N2吸附和脱附,再结合BET二常数公式法、MP法和BJH法,分析它们的微观结构和吸附量的变化关系。结果表明:样品的吸附等温线属于第Ⅳ类吸附等温线,它们的孔结构多为中孔。与不含Ag2O的样品相比,Ag2O的添加使样品的孔径分布的最高峰向直径减小的方向发展,添加Ag2O的质量分数wAg2O=15%的样品的比表面积和孔容积分别增大了29.2%和4.8%,使其吸附量增大。与添加wAg2O=15%的样品相比,添加wAg2O=30%样品的比表面积和孔容积分别减小了11.7%和12.6%,且其孔径分布曲线的强度小,使其吸附量减小。Ag2O的添加使样品中的微孔消失,并且其平均孔径随wAg2O的增加而减小。但是样品中含有Ag2O后,wAg2O的增减对其平均孔径的影响不大。
In order to explain the adsorption amount of various getters from the microstructure of the sample, the adsorption and desorption of high purity N2 were carried out at 77 K using the ASAP2010 physical adsorption instrument. Combined with the BET second constant formula method, the MP method And BJH method to analyze the relationship between their microstructure and the amount of adsorption. The results show that the adsorption isotherms belong to the fourth type of adsorption isotherms and their pore structures are mostly mesopores. Compared with non-Ag2O-containing samples, the peak of pore size distribution of the samples was decreased toward the direction of decreasing diameter with the addition of Ag2O. The specific surface area and pore volume of samples with Ag2O mass fraction of wAg2O = 15% increased by 29.2% % And 4.8%, the adsorption capacity increased. Compared with the sample with wAg2O = 15%, the sample with wAg2O = 30% showed a decrease in specific surface area and pore volume of 11.7% and 12.6%, respectively, and its pore size distribution curve had a small intensity, which reduced its adsorption capacity. The addition of Ag2O disappears micropores in the sample, and its average pore size decreases with the increase of wAg2O. However, the sample containing Ag2O, wAg2O increase and decrease on its average pore size has little effect.