摘要
根据表面热力学原理,假定固体中间隙孔为平板型,推导出从多孔固体在液氮温度物理吸附氮气的等温线脱附分支计算其间隙孔径的方程。对用不同方法(经典方法、BB方法和本文方法)计算结果进行了比较。计算结果表明:在o<p/p_s<1范围内,用本文方法和BB方法计算出的孔直径(d_T和d_H)都大于用经典方法计算出的孔直径d_C;在p/p_s<0.71时,d_T>d_H;在p/p_s>0.71时,d_T>d_H;在p/p_s趋近于1时,BB方法和本文方法与经典方法趋于相同。
According to the principle of thermodynamics, a new equation has been derived which is used to calculate the mesopore diameters from the desorption branch of a nitrogen sorption isotherm (at liquid nitrogen temperature) in the case of silt-shaped pores. Comparisons have been made between the results calculated by three different methods. The mesopore diameter (dT) calculated by the equation presented in this paper and that (dH) by BB method are larger than that (dc) by the classical method respectively while 0<p/ ps<1, and dT> dH while p/ p_(s)<0.71, and dH> dT while p/ ps>0.71. The new method is close to the classical one when p/ ps approaches 1, so is the BB method.
出处
《中国纺织大学学报》
CSCD
1996年第4期104-110,共7页
Journal of China Textile University
关键词
固体
物理吸附
等温线
平板型间隙孔
计算
solid, physical adsorption, isotherm, surface, thermodynamic, pore size, slit-shaped mesopore
