Fluids and Rocks - Introduction to Carbon Capture and Sequestration - page 441

Figure 9.8.4 Dissolution rate constant of smectite and several other 2:1 structure
phyllosilicates
Same data as in Figure 9.8.2 , but the measured rates (in mol/g s) are normalized to the
specifi c surface area. The upper fi gure shows dissolution rates normalized to the
N 2 -BET surface area. The lower fi gure shows the same rates normalized to the edge
surface area (ESA) of the clay lamellae (either measured or estimated as ∼ 6.5 m 2 /g).
Figures reproduced from Rozal é n et al. [9.35], with permission from Elsevier .
the interlayer space is either accessible (in the case of smectite; see
Figure 9.2.3 ) or inaccessible to water (in the case of other 2:1 structure
phyllosilicates). The external surface area of these stacks is measured by
adsorption of nitrogen gas (with the so-called N 2 -BET method of
Brunauer, Emmett and Teller) [9.37]. Figure 9.8.4 shows that the