Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 4, Issue 15, Pages 3800-3805Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b202024f
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The diffusion coefficient of nickel nitrate dissolved in water in porous silica plates with different pore size was measured to investigate the effect of pore size on the liquid-phase diffusion resistance. The pore-diffusion coefficient of nickel nitrate varied with the pore size of the silica gel. In pores of diameter > 5 nm, the diffusion resistance can be ignored, and the pore-diffusion coefficient varies proportionally to the porosity of the silica plates. In pores of diameter < 5 nm, however, the diffusion resistance increases rapidly with decreasing pore diameter. A microporous silica shows the largest diffusion resistance: the pore-diffusion coefficient in micropores is less than 0.01 of the diffusion coefficient in an unbounded system.
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