Charge Regulation at the Surface of Porous Solids: A Comparison between the Results Obtained Using Different Potential-to-Charge Relations
✍ Scribed by Boris V. Zhmud
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 234 KB
- Volume
- 183
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
a drop in the dielectric constant of the solution near a charged Distributions of the surface charge density and surface potential surface. In the linear approximation, the application of which over pore sizes for a meso-porous amine-containing silica gel have is justified as the electric field strength is smaller than 10 8 been calculated using different potential-to-charge relations. The V m 01 , this effect is described by the Booth-Kirkwood surface charge density has been seen to fall down with decreasing formula (4, 5), the reduced pore size, xR p ; herewith the effect of the electrostatic saturation becomes less marked and manifests itself up to xR p Ç D Å D ϱ (1 0 u(Çu) 2 ), [1] 3 as the Debye-Hu ¨ckel equation is used, and up to xR p Ç 1 as the Poisson-Boltzmann equation is used. The role of the spatial where D ϱ is the dielectric constant of the bulk solution, u dispersion of the dielectric constant brought about by the electrostatic saturation in the charge regulation at porous solid/electro-Å ec/k B T is the reduced electrostatic potential, and lytic solution interfaces has been analyzed on a quantitative level.