Relaxation Exchange in Nanoporous Silica by low-field NMR
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| Title: | Main Title: Relaxation Exchange in Nanoporous Silica by low-field NMR |
| Description: | 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: | 10.1524/zpch.2012.0293 (DOI) |
| Related Resource: | Is Version Of http://www.tr32db.uni-koeln.de/data.php?dataID=665 (URL) |
Responsible Party
| Creators: | Eva Paciok (Author), Agnes Haber (Author), Maxime Van Landeghem (Author), Bernhard Blümich (Author) |
| Publisher: | Oldenbourg Wissenschaftsverlag, München |
| Publication Year: | 2016 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A1 |
| Subjects: | Keywords: Low-Field NMR, Water Content, Water Fluxes, Soil DDC: 500 Natural sciences and mathematics |
File Details
| Filename: | Paciok_2012_ZPCH.pdf |
| Data Type: | Text - Article |
| File Size: | 410 KB |
| Date: | Available: 11.09.2012 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| 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 |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Zeitschrift für Physikalische Chemie |
| Issue: | 11-12 |
| Volume: | 226 |
| Number of Pages: | 16 (1243 - 1258) |
Metadata Details
| Metadata Creator: | Markus Küppers |
| Metadata Created: | 11.05.2016 |
| Metadata Last Updated: | 11.05.2016 |
| Subproject: | A1 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 1041 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 2 |
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