Tesi etd-02192017-022618 |
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Tipo di tesi
Tesi di laurea magistrale
Autore
VALENTI, SOFIA
URN
etd-02192017-022618
Titolo
EFFECT OF DENSITY AND TEMPERATURE ON RELAXATION DYNAMICS IN GLASSES
Dipartimento
FISICA
Corso di studi
FISICA
Relatori
relatore Prof. Capaccioli, Simone
Parole chiave
- aging
- amorphous drugs
- broadband dielectric spectroscopy
- energy landscape
- glass transition
- pressure
- stability
Data inizio appello
13/03/2017
Consultabilità
Non consultabile
Data di rilascio
13/03/2087
Riassunto
We measured the relaxation processes of different glass-forming liquids, focusing our attention on the pressure and temperature effects on secondary Johari-Goldstein (JG) relaxations. New insigths on the energy landscape governing this type of process, were found. The effect of ageing was also measured. In particular we focused on the non-ergodicity of glasses and how it affects the stability of amorphous drugs. A correlation between numbers of nuclei formed during cold-crystallization and aging time of the glass was found.
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