Guest Diffusion in Interpenetrating Networks of Micro- and Mesopores

被引：28

作者：

Furtado, Filipe ^{[1
,2
]}

Galvosas, Petrik ^{[1
,3
]}

Goncalves, Maraisa

Kopinke, Frank-Dieter ^{[2
]}

Naumov, Sergej ^{[1
]}

Rodriguez-Reinoso, Francisco ^{[4
]}

Roland, Ulf ^{[2
]}

Valiullin, Rustem ^{[1
]}

Kaerger, Joerg ^{[1
]}

机构：

[1] Univ Leipzig, Dept Interface Phys, D-04103 Leipzig, Germany

[2] UFZ Helmholtz Ctr Environm Res, Dept Environm Engn, D-04318 Leipzig, Germany

[3] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Sch Chem & Phys Sci, Wellington 6140, New Zealand

[4] Univ Alicante, Dept Quim Inorgan, E-03080 Alicante, Spain

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 08期

关键词：

DEPENDENT SELF-DIFFUSION; MOLECULAR-DYNAMICS; FLUIDS; TRANSPORT; NANOPORES; LIQUIDS; CARBONS;

D O I：

10.1021/ja109235c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pulsed field gradient NMR is applied for monitoring the diffusion properties of guest molecules in. hierarchical pore systems after pressure variation in the external atmosphere. Following previous studies with purely mesoporous solids, also in the material containing both micro- and mesopores (activated carbon MA2), the diffusivity of the guest molecules (cyclohexane) is found to be most decisively determined by the sample "history": at a given external pressure, diffusivities are always found to be larger if they are measured after pressure decrease (i.e., on the "desorption" branch) rather than after pressure increase (adsorption branch). Simple model consideration reproduces the order of magnitude of the measured diffusivities as well as the tendencies in their relation to each other and their concentration dependence.

引用

页码：2437 / 2443

页数：7

共 44 条

[11] The motion of elements suspended in static liquids as claimed in the molecular kinetic theory of heat [J].