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Nuclear spin relaxation in a hexagonal lyotropic liquid crystal
| Content Provider | Semantic Scholar |
|---|---|
| Author | Quist, Per-Ola Halle, Bertil Furó, István |
| Copyright Year | 1991 |
| Abstract | The hexagonal (E) phase in the sodium dodecyl sulphate (SDS)/decanol/water system is investigated by 2H and 23Na nuclear magnetic resonance (NMR) of the selectively deuterated SDS and the sodium counterion. Using macroscopically oriented E phase samples, prepared from the magnetically aligned nematic (NC) phase, we measure the orientation‐dependent relaxation rates R1Z and R1Q as well as the line shape of both nuclei. The orientation dependence of the lab‐frame spectral densities, determined from the relaxation rates, allow us to separate contributions from different types of molecular motion. In particular, we find a dominant contribution from molecular diffusion around the cylindrical aggregate. From this contribution we determine the lateral diffusion coefficient of SDS to (1.4±0.2)×10−10 m2 s−1 at 25 °C (activation energy 26±2 kJ mol−1 ) and the counterion surface diffusion coefficient to (4.8±0.9)×10−10 m2 s−1 at 25 °C (a factor 2.8 smaller than in an infinitely dilute aqueous electrolyte solution). ... |
| Starting Page | 6945 |
| Ending Page | 6961 |
| Page Count | 17 |
| File Format | PDF HTM / HTML |
| DOI | 10.1063/1.461506 |
| Alternate Webpage(s) | http://www.cmps.lu.se/fileadmin/mps/Departments/BPC/Halle_group/Papers/1991_JCP_Ephase.pdf |
| Alternate Webpage(s) | https://doi.org/10.1063/1.461506 |
| Volume Number | 95 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
