Swelling, solid

Figure 18.29 Calculated solid swelling of U-ZrHi 5 with 45 wt% uranium as a function of bumup at 600°C (873 K) (Huang et al 2001).

D. Schrire, A. Kindlund and P. Ekberg, Solid Swelling of LWR UO2 Fuel, Proc. Enlarged HPG Meeting, Lillehammer, Norway, HPR-349/22 (1998)... 

High solubility of the liquid in the solid Swelling, transitory liquid Swelling, and/or densification... 

Many solids show marked swelling as a result of the uptake of a gas or a liquid. In certain cases involving the adsorption of a vapor by a porous solid, a linear relationship exists between the percentage of linear expansion of Ae solid and the film pressure of the adsorbed material [134, 135]. 

The swelling of the adsorbent can be directly demonstrated as in the experiments of Fig. 4.27 where the solid was a compact made from coal powder and the adsorbate was n-butane. (Closely similar results were obtained with ethyl chloride.) Simultaneous measurements of linear expansion, amount adsorbed and electrical conductivity were made, and as is seen the three resultant isotherms are very similar the hysteresis in adsorption in Fig. 4.27(a), is associated with a corresponding hysteresis in swelling in (h) and in electrical conductivity in (c). The decrease in conductivity in (c) clearly points to an irreversible opening-up of interparticulate junctions this would produce narrow gaps which would function as constrictions in micropores and would thus lead to adsorption hysteresis (cf. Section 4.S). 

V. Laperche, J. F. Lambert, R. Prost, R., and J. J. Fripiat, High-resolution solid-state NMR of exchangeable cations in the interlayer surface of a swelling mica %a. 

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