TR32-Database: Database of Transregio 32

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

All available metadata of the dataset are listed below. Some features are available, e.g. download of dataset or additional description file.

Features
Citation
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.
Identification
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
Topic
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
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2012
Type:Article
Article Type:Journal
Source:Zeitschrift für Physikalische Chemie
Issue:11-12
Volume:226
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
Subproject:A1
Funding Phase:1
Metadata Language:English
Metadata Version:V41
Dataset Metrics
Page Visits:188
Metadata Downloads:0
Dataset Downloads:1
Dataset Activity
Features