Characterization of materials for application in extreme conditions, by calculating the specific surface and porosity (pore size distribution and morphology), is performed in the Laboratory for the physical and chemical surface characterization of materials for application in extreme conditions. Specific surface is determined by measuring the adsorption-desorption isotherms at liquid nitrogen temperature (physical adsorption). Pore size distribution, as a function of pore radios and shape, is calculated by using different mathematical models. The specific surface and the pore size distribution are fundamental parameters for the characterization of solids. Properties such as hardness, permeability, corrosion, thermal stress resistance, etc. can be directly correlated to the porous structure of the material. Chemical characterization of materials considers determination of quality and quantity of surface functional groups on surface of the material. The presence of functional groups strongly influences the possible application of materials. Optimization of synthesis procedure, as well as additional processing treatment (thermal, chemical etc.), enable the production of material with desired properties for specific application area. Chemical characterization of materials for application in extreme conditions, in the Laboratory for the physical and chemical surface characterization of the materials for application in extreme conditions, is executed by measuring the adsorption isotherms of different gases (hydrogen, oxygen, carbohydrates, aerated water etc). Also, chemical characterization of the surface of the materials is achieved by using Furrier transformed infrared spectroscopy (FTIR). These methods provide valuable information about active sites on the material surface, quality and quantity of surface functional groups, concentration and amount of acid/base sites on the surface.
Head of the laboratory
Dr Biljana Babić