[548] - Relaxation exchange in nanoporous silica by low-field NMR

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

By downloading files from this dataset you accept the license terms of TR32DB Data policy agreement and TR32DBData Protection Statement.
Adequate reference when this dataset will be discussed or used in any publication or presentation is mandatory. In this case please contact the dataset creator.
VERY IMPORTANT!
Due to the speed of the filesystem and depending on the size of the archive and the file to be extracted, it may take up to thirty (!) minutes until a download is ready! Beware of that when confirming since you may not close the tab because otherwise, you will not get your file!
Features
Citation
Paciok, E., 2012. Relaxation exchange in nanoporous silica by low-field NMR. PhD Report, Institute for Technical and Macromolecular Chemistry, RWTH Aachen, Aachen, Germany. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=548 at 2019-08-20.
Citation Options
Export as: Select the file format for your download.Citation style: Select the displayed citation style.
Identification
Title(s):Main Title: Relaxation exchange in nanoporous silica by low-field NMR
Description(s):Abstract: 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 temperaturedependent bimodal relaxation distribution and two-site relaxation exchange. Our recently introduced kinetic multisite exchange model is applied to derive the according exchange rates. The resulting Arrhenius plot produces an exchange activation energy of 7.1 kJ/mol, which is well below the hydrogen bond energy or the activation energy for self-diffusion of water in the bulk. A possible hoppingmechanism as the source of enhanced proton-diffusion in nanoporous silica is discussed, as well as its significance to mass transfer in porous media.
Responsible Party
Creator(s):Author: Eva Paciok
Publisher:CRC/TR32 Database (TR32DB)
Topic
TR32 Topic:Other
Subject(s):CRC/TR32 Keywords: NMR, PhD Report
File Details
File Name:Report1_Paciok_2012.pdf
Data Type:Text
File Size:3012 kB (2.941 MB)
Date(s):Available: 2012-01-01
Mime Type:application/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.
Licence:TR32DB Data policy agreement
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Report
Report Date:1st of January, 2012
Report Type:PhD Report
Report City:Aachen, Germany
Report Institution:Institute for Technical and Macromolecular Chemistry, RWTH Aachen
Number Of Pages:16
Period of Pages:1 - 16
Further Informations:TR32 Student Report Phase II
Metadata Details
Metadata Creator:Eva Paciok
Metadata Created:2013-10-31
Metadata Last Updated:2013-10-31
Subproject:A1
Funding Phase:2
Metadata Language:English
Metadata Version:V40
Dataset Metrics
Page Visits:273
Metadata Downloads:0
Dataset Downloads:0
Dataset Activity
Features