[1114] - Relaxation Exchange in Nanoporous Silica by low-field NMR

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Paciok, E., Haber, A., Van Landeghem, M. ., Blümich, B., 2012. Relaxation Exchange in Nanoporous Silica by low-field NMR. Zeitschrift für Physikalische Chemie, 226 (11-12), 1243 - 1258. DOI: 10.1524/zpch.2012.0293.
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Title(s):Main Title: Relaxation Exchange in Nanoporous Silica by low-field NMR
Description(s):Abstract: Low Field NMR / Relaxation Exchange / Nanoporous Silica Investigating the 2D-T2-T2-relaxation exchange of interstitial water in a packing of sedimented Stöber-silicate spheres, we come the conclusion that contrary to its behaviour in macro-pores, water confined in nano-pores of silica exhibits enhanced diffusivity. The 2D-experiments, performed at different temperatures, reveal a temperature-dependent bimodal relaxation distribution and two-site relaxation exchange. Our recently introduced kinetic multi-site exchange model is applied to derive the according exchange rates. The resulting Arrhenius plot produces an exchange activation energy of 7 kJ/mol, which is well below the hydrogen bond energy or the activation energy for self-diffusion of water in the bulk. A possible hopping-mechanism as the source of enhanced proton-diffusion in nanoporous silica is discussed, as well as its significance to mass transfer in porous media.
Identifier(s):DOI: 10.1524/zpch.2012.0293
Relation(s):Is Version Of: URL: http://www.tr32db.uni-koeln.de/data.php?dataID=665
Responsible Party
Creator(s):Author: Eva Paciok
Author: Agnes Haber
Author: Maxime Van Landeghem
Author: Bernhard Blümich
Publisher:Oldenbourg Wissenschaftsverlag, München
TR32 Topic:Soil
Related Sub-project(s):A1
Subject(s):CRC/TR32 Keywords: Low-Field NMR, Water Content, Water Fluxes, Soil
DDC: 500 Natural sciences and mathematics
File Details
File Name:Paciok_2012_ZPCH.pdf
Data Type:Text
File Size:410 kB (0.4 MB)
Date(s):Available: 2012-09-11
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Article Type:Journal
Source:Zeitschrift für Physikalische Chemie
Number Of Pages:16
Page Range:1243 - 1258
Metadata Details
Metadata Creator:Markus Küppers
Metadata Created:2016-05-11
Metadata Last Updated:2016-12-01
Funding Phase:1
Metadata Language:English
Metadata Version:V41
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