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Quasi-isothermal and heat-cool protocols from MT-DSC - Influence on the values extracted for the cooperativity length calculation

  • Understanding the evolution of the cooperative molecular mobility as a function of time and temperature remains an unsolved question in condensed matter physics. Many recent works concern the question of the molecular dynamic slowdown in a temperature domain ranging from the crossover temperature T c (beginning of cooperative relaxation) down to the calorimetric glass transition temperature T g. Recent studies have shown that the estimation of cooperativity length based on calorimetric investigations using Donth's approach can be extended to a wider temperature range from T g to T c. To describe the relaxation time evolution and the characteristic length evolution of cooperative motions, besides the Donth's fluctuation approach other models exist in the literature such as '4 points correlation function' model. Whatever the model used, calorimetric investigations are needed to estimate the heat capacity as a function of the temperature. In this work, we have focused our attention on theUnderstanding the evolution of the cooperative molecular mobility as a function of time and temperature remains an unsolved question in condensed matter physics. Many recent works concern the question of the molecular dynamic slowdown in a temperature domain ranging from the crossover temperature T c (beginning of cooperative relaxation) down to the calorimetric glass transition temperature T g. Recent studies have shown that the estimation of cooperativity length based on calorimetric investigations using Donth's approach can be extended to a wider temperature range from T g to T c. To describe the relaxation time evolution and the characteristic length evolution of cooperative motions, besides the Donth's fluctuation approach other models exist in the literature such as '4 points correlation function' model. Whatever the model used, calorimetric investigations are needed to estimate the heat capacity as a function of the temperature. In this work, we have focused our attention on the modulated temperature differential scanning calorimetry (MT-DSC) experiments and we have tested different MT-DSC protocols allowing the heat capacity determination. For this goal we decided to work on different amorphous glass formers in order to cover a large range of glass transition temperature. The influence of the protocol used on the cooperativity length calculation is discussed in detail. Lissajous figures were constructed to verify whether the steady state is reached.zeige mehrzeige weniger

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Metadaten
Autor*innen:B. Rijal, L. Delbreilh, J.-M. Saiter, Andreas SchönhalsORCiD, A. Saiter
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Journal of thermal analysis and calorimetry
Jahr der Erstveröffentlichung:2015
Verlag:Kluwer Academic Publ.
Verlagsort:Dordrecht
Jahrgang/Band:121
Ausgabe/Heft:1
Erste Seite:381
Letzte Seite:388
Freie Schlagwörter:Cooperative rearranging region (CRR); Glass transition; Heat capacity; MT-DSC
DOI:10.1007/s10973-015-4671-4
ISSN:1388-6150
ISSN:1418-2874
ISSN:0368-4466
ISSN:1572-8943
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:13.07.2015
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