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: 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: | Eva Paciok (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Other |
| Related Subproject: | A1 |
| Subjects: | Keywords: NMR, PhD Report |
File Details
| Filename: | Report1_Paciok_2012.pdf |
| Data Type: | Text - Text |
| File Size: | 2.9 MB |
| Date: | Available: 01.01.2012 |
| Mime Type: | application/pdf |
| 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 |
Geographic
Specific Information - 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 (1 - 16) |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Eva Paciok |
| Metadata Created: | 31.10.2013 |
| Metadata Last Updated: | 31.10.2013 |
| Subproject: | A1 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 657 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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