Interaction of gases with monolayer WS2: An In Situ Spectroscopy Study

The optical and electronic properties of two-dimensional (2D) materials can be tuned through physical and chemical adsorption of gases. They are also ideal sensor platforms, where charge transfer from the...

Pickett Equation for the Description of Adsorption on Arbitrary Surfaces

The theory of multilayer adsorption of gases, namely the Pickett equation, has been developed to the case of adsorption on arbitrary surfaces in a molecular and a topological approach. We present the prediction of the fractal dimension for the surface of an adsorbent and for the set of interfaces generated by the growing of layers. The theoretical models correctly predict quantities and qualitative features of the experiment for two systems: adsorption of water vapor (T = 298 K) on the sample of lunar regolith and of nitrogen (T = 77 K) on a coal sample.

State primary standard of units of specific adsorption of gases, specific surface area, specific pore volume, pore size, open porosity and gas permeability coefficient of solids and materials GET 210-2019

Methods and instruments the characteristics of porosity and permeability of solids and materials are described, which are part of the improved GET 210-2014. The metrological characteristics of the GET 210-2014 are compared and after its improvement the GET 210-2019. Certified reference materials of approved types based on micro-, meso- and macroporous solids are considered. The results of international comparisons, confirmed measuring and calibration capabilities, as well as a comparison of the metrological characteristics of the GET 210-2019 with the standards of foreign countries are presented.