Characterization of surfacial basic sites of sol gel-prepared alkaline earth fluorides by means of PulseTA®

► Pulse Thermal Analysis is used to characterize basic sites at the surface of sol gel-prepared metal fluorides via the exothermicity of the CO2 adsorption. ► Basic sites can be created at the surface of the fluorides by alternating the CO2 injections by water pulses. ► The exothermal DTA effects of the CO2 adsorption can be used for a quantification, i.e. for a comparison of the basicity of the sites. ► The isothermal measuring mode allows to observe very fine details of the sorption process, especially via shape and areas of the DTA effects.