A laboratory experiment on melting of pressure ridge keels in the summer Arctic (abstract)

In a laboratory study we consider a phenomenon which occurs in the summer Arctic; namely, the melting of the pressure ridge keels in salt-stratified water at uniform temperatures. The experiments took place in a glass tank that measured 0.60m long, 0.30m wide, and 0.45m deep, which was filled to a depth of 0.25m with water linearly stratified with salt (salinity at the surface 3%, and salinity gradients : 1.6,2.6,3.8%/m), at uniform temperatures : +10.5,+8.7,+4.4,-0.5,-1.

The Procedure for Evaluating the Adsorption Energy Distribution from an Analysis of Thermodesorption Spectra Based on the Statistical Rate Theory

We have recently proposed a new method for evaluating the adsorption energy distribution function χ(ε) from the numerical analysis of thermodesorption spectra. This method is based on an application of the Statistical Rate Theory developed by Ward et al . (1982). In this paper, we present some simplifications of this method thereby allowing its ready application. Illustrative calculations for the nitrogen thermodesorption spectra from the surface of molecular sieve carbon fibres (MSCF) are presented

Adsorption of cadmium ions at the electrolyte/silica interface: II. Theoretical study of surface energetic heterogeneity

International audienceThe equations developed by us for the triple layer surface complexation approach, taking into account energetic heterogeneity of surface oxygen, are applied here to study the heterogeneity influences on the adsorption of cadmium ions at the NaClO4/silica aqueous solution interface. The model of surface heterogeneity made it possible to fit in a quantitative way the data obtained in the four independent experiments: surface charge measurements (titration), measurements of electrophoretic mobility and monitoring radiometrically cation of inert electrolyte adsorption, together with cadmium ion adsorption at different pH values. Particularly the studies of cadmium ion adsorption show that the energetic heterogeneity of the silica surface oxygen should be taken into account