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Melting of Naphthalene Confined in Mesoporous Silica MCM-41

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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