Abstract
In this article we present an ultrasonic study on the elasticity of oxygen confined to nanoporous Vycor glass. During cooling of the completely filled sample, we observe abrupt changes of the shear modulus indicating phase transitions of the adsorbed oxygen. However, also outside of these transition ranges the elasticity of the confined oxygen changes and this temperature dependence does not in the least correspond to the temperature dependence for bulk oxygen. Measurements with only an adsorbed oxygen layer on the pore walls reveal that this layer behaves solidlike already above the bulk melting temperature, Tm,bulk, which was not observed for other adsorbates in previous measurements. The values for the shear modulus of the confined oxygen are higher than the shear modulus of both γ-, β-, and α-oxygen, in particular for the surface layer. We show that the enhancement of the shear modulus of adsorbed substances cannot directly be inferred from the strength of the interaction between adsorbate and pore su...
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