Intracrystalline Diffusivities and Surface Permeabilities Deduced from Transient Concentration Profiles: Methanol in MOF Manganese Formate
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- 作者：Pavel V. Kortunov ; Lars Heinke ; Mirko Arnold ; Yannic Nedellec ; Deborah J. Jones ; Jü ; rgen Caro ; Jö ; rg Kä ; rger
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：June 27, 2007
- 年：2007
- 卷：129
- 期：25
- 页码：8041 - 8047
- 全文大小：497K
- 年卷期：v.129,no.25(June 27, 2007)
- ISSN：1520-5126
文摘
The intracrystalline concentration profiles during molecular uptake of methanol by an initiallyempty, single crystal of microporous manganese(II) formate (Mn(HCO2)2), representing an ionic inorganic-organic hybrid within the MOF family, are monitored by interference microscopy. Within these profiles, acrystal section could be detected where over the total of its extension (
2 
m × 50 m × 30 m) molecularuptake ideally followed the pattern of one-dimensional diffusion. Analysis of the evolution of intracrystallineconcentration in this section directly yields the permeability of the crystal surface and the intracrystallinediffusivity as a function of the concentration of the total range of 0 
0.57 covered in the experiments.Within this range, the surface permeability is found to increase by 1 order of magnitude, while, within thelimits of accuracy (±30%), the transport diffusivity remains constant, thus reflecting the properties of thelattice gas model.
2 m × 50 m × 30 m) molecularuptake ideally followed the pattern of one-dimensional diffusion. Analysis of the evolution of intracrystallineconcentration in this section directly yields the permeability of the crystal surface and the intracrystallinediffusivity as a function of the concentration of the total range of 0 0.57 covered in the experiments.Within this range, the surface permeability is found to increase by 1 order of magnitude, while, within thelimits of accuracy (±30%), the transport diffusivity remains constant, thus reflecting the properties of thelattice gas model.