Studies of Copper Surfaces by Low Temperature Adsorption Isotherms

1950 ◽  
Vol 72 (10) ◽  
pp. 4343-4348 ◽  
Author(s):  
T. N. Rhodin
Keyword(s):  
Low Temperature ◽  
Adsorption Isotherms ◽  
Copper Surfaces

Chemical Displacement of Molecules Adsorbed on Copper Surfaces:  Low-Temperature Studies with Applications to Surface Reactions

1997 ◽  
Vol 101 (40) ◽  
pp. 7908-7918 ◽  
Author(s):  
P. W. Kash ◽  
M. X. Yang ◽  
A. V. Teplyakov ◽  
G. W. Flynn ◽  
B. E. Bent
Keyword(s):  
Low Temperature ◽  
Surface Reactions ◽  
Copper Surfaces

scholarly journals Analysis of argon isotope separation by low temperature adsorption

2020 ◽  
Vol 324 ◽  
pp. 01006
Author(s):  
Vitaly L. Bondarenko ◽  
Maxim Y. Kupriyanov ◽  
Artem I. Verkhovnyi
Keyword(s):  
Low Temperature ◽  
Adsorption Isotherms ◽  
Equations Of State ◽  
Isotope Separation ◽  
Critical Parameters ◽  
Cryogenic Temperatures ◽  
Isotope Mixture ◽  
Argon Isotopes ◽  
Argon Isotope ◽  
Analytical Expressions

In this work, the estimated calculated values of the critical parameters of argon isotopes 36Ar, 38Ar, 40Ar and the corresponding values of the constants of the Van der Waals, Redlich-Kwong and Peng-Robinson equations of state are obtained. The data obtained make it possible to calculate the adsorption isotherms of argon isotopes on microporous adsorbents. The technique proposed for obtaining analytical expressions for the adsorption isotherms of argon isotopes at cryogenic temperatures makes it possible to estimate the degree of influence of the pressure of the isotope mixture and its composition on the mixture separations coefficients.

scholarly journals The Study of Bound Water Status and Pore Size Distribution of Chinese Fir and Poplar Cell Wall by Low-Field NMR

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Huimin Cao ◽  
Jianxiong Lyu ◽  
Yongdong Zhou ◽  
Xin Gao
Keyword(s):  
Cell Wall ◽  
Low Temperature ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Adsorption Isotherms ◽  
Bound Water ◽  
Chinese Fir ◽  
Fast Growing ◽  
Pore Size Distributions

With the increasing shortage of timber resources and the advancement of environmental protection projects, many artificial fast-growing forests are planted and used as raw materials in China. There are significant differences in the properties of natural forest wood and artificial fast-growing forest wood, and the properties of wood mainly depend on the change in the status of bound water in the cell wall. In this study, the fiber saturation point (FSP) and pore size distributions within the cell wall of six species of fast-growing forest wood were studied by low-temperature nuclear magnetic resonance (NMR) technology. The effects of species, growth rings, and extractives on the FSP and pore structure were analyzed. The water vapor sorption experiments were performed, and the adsorption isotherms of the samples were fitted through the Guggenheim-Anderson-de Boer (GAB) equation. According to the least-square regression of the adsorption isotherms and combined with the low-temperature NMR experiments, the content and proportion of the different types of bound water were analyzed. The results showed that the average FSP of each Chinese fir was about 40% and that of each poplar was about 35%. There is about a 10% difference between the FSP measured by NMR technology and the adsorption bound water content obtained by adsorption isothermal. The pore size distribution results show that in all samples, the proportion of pores larger than 10.5 nm is very low, about 10%; the proportion of 1.92-10.5 nm pores is about 30%; and the proportion of pores smaller than 1.92nm is more than 50%. This work will be helpful to the study of the wood moisture status and provide reference data for wood modification.

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