Dresden 2009 – wissenschaftliches Programm
MM 21.5: Poster
Dienstag, 24. März 2009, 14:45–16:30, P4
Thermodynamic Investigations of Nitrogen confined in Mesopores — •Sebastian Mörz and Patrick Huber — Technische Physik, Universität des Saarlandes, Saarbrücken
The thermodynamic behaviour of nitrogen confined in a mesoporous silica matrix (SBA-15) has been studied by differential scanning calorimetry (DSC) in the temperature range from the bulk melting point down to 42 K and as a function of the filling fraction of the matrix. The heat capacity shows a single melting anomaly in the vicinity of 55 K and a complex freezing anomaly between 47 K and 52 K
Additionally, the structure of the confining matrix has been studied by sorption isotherms which reveal a pore size distribution consisting of uniform mesopores as well as a pronounced corona of micro- and smaller mesopores.