Grünberg, B. ; Grünberg, A. ; Limbach, H. H. ; Buntkowsky, G. (2013)
Melting of Naphthalene Confined in Mesoporous Silica MCM-41.
In: Applied Magnetic Resonance, 44 (1-2)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The H-2 nuclear magnetic resonance (NMR) solid-echo spectra of naphthalene molecules as guests in the mesopores of neat MCM-41 with a pore width of 3.3 nm were measured in the temperature regime from 180 to 250 K. A strong reduction of the melting point of the naphthalene molecules by 152 K is observed. The line shape changes in the melting region were simulated with two different models, namely, the model of a narrow distribution of activation energies, which is typical for a crystal-like phase, and a two-phase model. Both models indicate a relatively narrow distribution of melting points of the naphthalene molecules inside the pores, indicative of a rather well-defined structure of the naphthalene molecules inside the pores. This finding supports the proposal of a plastic crystalline phase previously proposed by other groups.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Grünberg, B. ; Grünberg, A. ; Limbach, H. H. ; Buntkowsky, G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Melting of Naphthalene Confined in Mesoporous Silica MCM-41 |
| Sprache: | Englisch |
| Publikationsjahr: | 2013 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Magnetic Resonance |
| Jahrgang/Volume einer Zeitschrift: | 44 |
| (Heft-)Nummer: | 1-2 |
| URL / URN: | http://apps.webofknowledge.com/full_record.do?product=WOS&se... |
| Kurzbeschreibung (Abstract): | The H-2 nuclear magnetic resonance (NMR) solid-echo spectra of naphthalene molecules as guests in the mesopores of neat MCM-41 with a pore width of 3.3 nm were measured in the temperature regime from 180 to 250 K. A strong reduction of the melting point of the naphthalene molecules by 152 K is observed. The line shape changes in the melting region were simulated with two different models, namely, the model of a narrow distribution of activation energies, which is typical for a crystal-like phase, and a two-phase model. Both models indicate a relatively narrow distribution of melting points of the naphthalene molecules inside the pores, indicative of a rather well-defined structure of the naphthalene molecules inside the pores. This finding supports the proposal of a plastic crystalline phase previously proposed by other groups. |
| Freie Schlagworte: | optical nuclear-polarization solid-state nmr magnetic-resonance potential applications molecular-dynamics glass formers mas nmr surface spectroscopy resolution |
| Zusätzliche Informationen: | 074EU Times Cited:1 Cited References Count:68 |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 27 Okt 2014 20:40 |
| Letzte Änderung: | 28 Mai 2019 13:03 |
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