Angstrom Porosimety with quantum Herium

He原子是最小的球形单原子分子，与任何固体表面非特异性地相互作用。4.2K下He吸附是测定Angstrom孔结构的有效方法。将4.2K下的He吸附应用于活性炭体系。分别以He在平表面上的理论吸附密度（0.202gml^<-1>）和液态N_2的理论吸附密度（0.807gml^）与N_2吸附等温<-1>线进行比较。在低相对压力区，He的吸附量远大于N_2的吸附量。这表明更好的可及性和加速的He双层吸附。通过Dubinin-Radushukevich图分析了He的吸附等温线，并利用高斯分布函数和Dubinin-Stoeckli关系，建立了由He吸附等温线确定Angstrom孔径分布的方法。该分析对于确定埃孔径分布是相当有效的。 ...更多信息 活性炭的用途它可以显示存在的Angstrom孔，不能用N_2吸附法评价。然而，这种方法的应用仅限于活性炭系统。我们开发了一个更一般的分析使用的潜在的配置文件和分布的He原子在孔隙中。我们应用斯蒂尔的方法，他吸附在平坦的表面上的埃孔分析。用Lennard-Jones势作为孔宽的函数，通过计算确定了He原子与孔的势分布。这种潜在的配置文件和统计考虑导致可能的人口的他原子的孔。因此，我们可以通过对所观察到的吸附等温线的最佳拟合程序来确定粒径分布。结果表明，分子势方法具有普遍适用性，是一种有希望的表征Angstrom孔的方法。同时，采用GCMC（Grand Canonical Monte Calro）计算机模拟方法对He的吸附等温线进行了分析.然而，这将需要更多的时间来建立发展的埃孔径分布测定与GCMC方法。少

A He atom is the smallest spherical monoatomic molecule and interacts nonspecifically with any solid surface. He adsorption at 4.2 K is an effective method for determination of Angstrom pore structures. The He adsorption at 4.2 K was applied to activiated carbon system. The adsorption isotherms were compared with N_2 adsorption isotherms using the theoretical adsorbed He density (0.202gml^<-1>) on the flat surface and the liquid N_2 density (0.807gml^<-1>) , respectively. The amount of He adsorption was much greater than that of N_2 in the low relative pressure region. This suggests better accessibility and accelerated bilayr adsorption of He. The He adsorption isotherm was analyzed by the Dubinin-Radushukevich plot and we developed the determination method of the Angstrom pore size distribution from the He adsorption isotherm using the Gaussian distribution function and the Dubinin-Stoeckli relation. This analysis was quite effective for determination of the Angstrom pore size distrib … More ution for activated carbon. It can show presence of the Angstrom pores which cannot be evaluated by N_2 adsorption method. However, the application of this approach is limited to activated carbon system. We developed a more general analysis using the potential profile and distribution of a He atom in the pore. We applied the Steele approach to He adsorption on the flat surface to the Angstrom pore analysis. The potential profile of a He atom with the pore was determined by calculation using the Lennard-Jones potential as a function of the pore width. This potential profile and statistical considerations lead to a possible population of He atoms in the pore. Hence, we can determine the micropore size distribution by the best fit procedure to the observed adsorption isotherm. It was shown that this molecular potential approach for He adsorption having a general applicability is a hopeful method for Angstrom pore characterization. Also the Grand Canonical Monte Calro (GCMC) computer simulation was applied to analyze the He adsorption isotherm. However, it will take more time to establish the development of the Angstrom pore size distribution-determination with the GCMC method. Less