Spehr, T. ; Frick, B. ; Grillo, I. ; Stühn, B. (2008)
Supercooling of water confined in reverse micelles.
In: Journal of Physics: Condensed Matter, 20 (10)
doi: 10.1088/0953-8984/20/10/104204
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report on the temperature dependence of the nanosecond-timescale dynamics of the ternary mixture water/AOT/oil with deuterated heptane, toluene or decane as the oil. Water-swollen reverse micelles as formed in such microemulsions allow us to investigate the freezing behaviour of water confined in a soft environment. We report here on the first neutron scattering studies in which the freezing of the confined water and of the oil is followed down to temperatures at which the whole system is frozen. We focus on studies of water confined in three different droplet sizes: by means of small-angle neutron scattering we have determined the radii to be 46, 18, and 7 angstrom for water to surfactant ratios omega = 40, 12, and 3. From elastic temperature scans by neutron backscattering we deduce a strong supercooling of water confined in the reverse swollen micelles which increases with decreasing droplet size. For the smallest droplets we find a supercooling of more than 45 K compared to bulk water.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Spehr, T. ; Frick, B. ; Grillo, I. ; Stühn, B. |
| Art des Eintrags: | Bibliographie |
| Titel: | Supercooling of water confined in reverse micelles |
| Sprache: | Deutsch |
| Publikationsjahr: | 2008 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Condensed Matter |
| Jahrgang/Volume einer Zeitschrift: | 20 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1088/0953-8984/20/10/104204 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | We report on the temperature dependence of the nanosecond-timescale dynamics of the ternary mixture water/AOT/oil with deuterated heptane, toluene or decane as the oil. Water-swollen reverse micelles as formed in such microemulsions allow us to investigate the freezing behaviour of water confined in a soft environment. We report here on the first neutron scattering studies in which the freezing of the confined water and of the oil is followed down to temperatures at which the whole system is frozen. We focus on studies of water confined in three different droplet sizes: by means of small-angle neutron scattering we have determined the radii to be 46, 18, and 7 angstrom for water to surfactant ratios omega = 40, 12, and 3. From elastic temperature scans by neutron backscattering we deduce a strong supercooling of water confined in the reverse swollen micelles which increases with decreasing droplet size. For the smallest droplets we find a supercooling of more than 45 K compared to bulk water. |
| Zusätzliche Informationen: | 4th European Conference on Neutron Scattering, Lund, Sweden, JUN, 2007 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) |
| Hinterlegungsdatum: | 21 Dez 2009 14:22 |
| Letzte Änderung: | 05 Mär 2013 09:28 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum