Various methods to describe the morphological and textural characteristics of various materials
Journal Title: Хімія, фізика та технологія поверхні - Year 2018, Vol 9, Issue 4
Abstract
The aim of this study was to compare a variety of methods to describe the textural characteristics of various materials. Several ways could be used to describe the morphological and textural characteristics of various materials in detail such as: (i) adsorption-desorption of low-molecular weight probe compounds (N2, CO2, Ar, C6H6, H2O, etc.) in the gaseous (vapor) phase with increasing-decreasing pressure; (ii) adsorption of low- or high-molecular weight compounds from liquid solutions with increasing concentration of a solute; (iii) small angle X-ray scattering (SAXS) or small angle neutron scattering (SANS); (iv) quantitative analysis of images recorded using TEM, SEM, AFM, CLSM, etc.; (v) thermoporometry based on DSC or TG measurements with decreasing-increasing temperature; (vi) cryoporometry based on NMR spectroscopy measurements vs. temperature; and (vii) relaxometry based on NMR spectroscopy and thermally stimulated depolarization current measurements. There are several reasons of the use of mentioned above methods in parallel. For example, a material, which is strongly hydrated in native state, can strongly change the texture upon drying; thus, it should be studied in both states. Various adsorbates can penetrate into different pores or differently fill pores of different sizes that should be taken into account upon the analyses of various data. There are accessible and inaccessible pores (such as closed or too narrow for used adsorbate molecules), but SAXS can give information on all pores in contrast to the adsorption methods. Thus, the larger the number of applied methods, the more comprehensive the morphological and textural characterization of the adsorbents, and this is clearly shown below.
Authors and Affiliations
V. M. Gun'ko
Keywords
Related Articles
- EP ID EP462192
- DOI 10.15407/hftp09.04.317
- Views 83
- Downloads 0
On the problem of physical-chemical parameters influence on the frequency of spontaneous electrochemical oscillations
A review of recent literature data on appearance of spontaneous oscillations in electrochemical systems of practical relevance is presented. They include electrocatalytic reactions of electrooxidation of hydrogen and sma...
Anomalous diffusion of methanol in zeolite-containing catalyst for methanol to hydrocarbons conversion
For the first time, it is demonstrated that the methanol diffusion in the H-ZSM-5/Al2O3 catalyst pellet is anomalous and is described by the time-fractional diffusion equation. The regime of the methanol transport is sub...
Синтез многослойного азаграфена и оксида нитрида углерода
Графитоподобный нитрид углерода (характеризующийся как нетоксичный и химически высокостойкий материал) и его наноструктурированные и допированные, в частности, кислородом, производные, привлекают особое внимание в качест...
Room-temperature NH3 gas sensors based on heterostructures PbS/CdS
In order to develop sensors capable to detect harmful gases at the ambient temperature, the semiconductor heterostructure PbS/CdS has been synthesized. Formation of CdS nanorods was conducted in the presence of ethylened...
Adsorption removal of anthocyanins from red cabbage extracts by bentonite: statistical analysis of main and interaction effects
In recent years, anthocyanins are widely used in food industry as natural dyes and in medicine as compounds with high antioxidant activity. In connection with this, examination of adsorption removal of anthocyanins from...