Dresden 2009 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 2: Topical Session Nanoporous Functional Materials II

MM 2.2: Talk

Monday, March 23, 2009, 12:30–12:45, IFW A

Elastic properties and freezing of argon confined in mesoporous glass — •Klaus Schappert and Rolf Pelster — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus E 2.6, 66123 Saarbrücken, Germany

We study the properties of argon adsorbed in mesoporous Vycor glass with a mean pore diameter of 8 nm. Our ultrasonic measurements show, that below the freezing point of argon the adsorption process proceeds in three steps [1]. The first few adsorbed wall-layers remain liquidlike; i.e., freezing starts only at a temperature dependent filling of the pores. At a somewhat higher filling of the porous sample, we observe an abrupt increase of the effective shear modulus to a plateau value. From the dependence of the effective shear modulus on the filling fraction and the temperature, we infer some elastic properties of the adsorbed argon itself.

[1] Klaus Schappert and Rolf Pelster, Phys. Rev. B 78, 174108 (2008)