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CVG-2107 (Chapter 2) 16 - -clay particle double layer free...

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Prof. M. Fall - Uniersity of Ottawa Prof. M. Fall - Uniersity of Ottawa 16 Some basic concepts 4.4 Fundamental properties of…… Double diffusive layer Electrochemical properties of clay minerals Interactions clay-water (swelling of clays) Cation exchange capacity (CEC) Interaction of clay particles Diffuse double layer In reality, single particles do not stand in isolation, but rather are next to each other so that their micelles interact. Interaction of clay particles Diffuse double layer Clay particle with negatively charged surface x Distance x Concentration Exponential decay Cations Anions - - + + - - - - - Interaction of clay particles Diffuse double layer + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + cations head2right cation concentration drops with distance from clay particle
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Unformatted text preview: - -- -- -- -- -- -- -clay particle double layer free water Source Siva Some basic concepts 4.4 Fundamental properties of…… Double diffusive layer Electrochemical properties of clay minerals Interactions clay-water (swelling of clays) Cation exchange capacity (CEC) Cation exchange capacity (CEC) CEC measures the ability of clay to exchange its cations. CEC measures the concentration in cations non fixed in the diffuse double layer and depends on the total charge (i.e., surface and structural charge). CEC depends on pH, and is generally given for neutral pH (7). measured in meq /100g (net negative charge per 100 g clay) milliequivalents...
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