Steinrücken, Elisa ; Wissel, Till ; Brodrecht, Martin ; Breitzke, Hergen ; Regentin, Julia ; Buntkowsky, Gerd ; Vogel, Michael (2021)
2H NMR study on temperature-dependent water dynamics in amino-acid functionalized silica nanopores.
In: The Journal of Chemical Physics, 154 (11)
doi: 10.1063/5.0044141
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We prepare various amino-acid functionalized silica pores with diameters of ∼6 nm and study the temperature-dependent reorientation dynamics of water in these confinements. Specifically, we link basic Lys, neutral Ala, and acidic Glu to the inner surfaces and combine 2H nuclear magnetic resonance spin–lattice relaxation and line shape analyses to disentangle the rotational motions of the surfaces groups and the crystalline and liquid water fractions coexisting below partial freezing. Unlike the crystalline phase, the liquid phase shows reorientation dynamics, which strongly depends on the chemistry of the inner surfaces. The water reorientation is slowest for the Lys functionalization, followed by Ala and Glu and, finally, the native silica pores. In total, the rotational correlation times of water at the different surfaces vary by about two orders of magnitude, where this span is largely independent of the temperature in the range ∼200–250 K.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Steinrücken, Elisa ; Wissel, Till ; Brodrecht, Martin ; Breitzke, Hergen ; Regentin, Julia ; Buntkowsky, Gerd ; Vogel, Michael |
| Art des Eintrags: | Bibliographie |
| Titel: | 2H NMR study on temperature-dependent water dynamics in amino-acid functionalized silica nanopores |
| Sprache: | Englisch |
| Publikationsjahr: | 15 März 2021 |
| Verlag: | AIP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Chemical Physics |
| Jahrgang/Volume einer Zeitschrift: | 154 |
| (Heft-)Nummer: | 11 |
| DOI: | 10.1063/5.0044141 |
| Kurzbeschreibung (Abstract): | We prepare various amino-acid functionalized silica pores with diameters of ∼6 nm and study the temperature-dependent reorientation dynamics of water in these confinements. Specifically, we link basic Lys, neutral Ala, and acidic Glu to the inner surfaces and combine 2H nuclear magnetic resonance spin–lattice relaxation and line shape analyses to disentangle the rotational motions of the surfaces groups and the crystalline and liquid water fractions coexisting below partial freezing. Unlike the crystalline phase, the liquid phase shows reorientation dynamics, which strongly depends on the chemistry of the inner surfaces. The water reorientation is slowest for the Lys functionalization, followed by Ala and Glu and, finally, the native silica pores. In total, the rotational correlation times of water at the different surfaces vary by about two orders of magnitude, where this span is largely independent of the temperature in the range ∼200–250 K. |
| Zusätzliche Informationen: | Art.No.: 114702 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Physik Kondensierter Materie (IPKM) 05 Fachbereich Physik > Institut für Physik Kondensierter Materie (IPKM) > Molekulare Dynamik in kondensierter Materie |
| Hinterlegungsdatum: | 09 Mai 2022 08:58 |
| Letzte Änderung: | 09 Mai 2022 08:58 |
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