Dynamic mechanical analysis of confined glass-forming liquids

Johannes Koppensteiner, Wilfried Schranz (Korresp. Autor*in)

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

Abstract

Acoustic spectroscopy is a valuable tool, when the degrees of freedom of a material couple to strain. Since this is the case for molecular glass-forming liquids the dynamic mechanical response is a quantity of primary interest here. Dynamic mechanical analysis measurements (0.1-100 Hz) have been performed for salol, toluene and ortho-terphenyl confined in mesoporous (2.5-10 nm) silica matrices. Important parameters (relaxation times of the slow -relaxation, change of Tg with pore size, number and size of dynamically correlated molecules, etc.) characterizing the glass freezing in the three glass-forming liquids have been extracted from the measurements for various confining pore sizes. A comparison with literature data shows excellent agreement and demonstrates that mechanical measurements provide a very sensitive tool to probe the dynamics of molecular glass forming liquids in confined systems.
OriginalspracheEnglisch
Seiten (von - bis)744-757
Seitenumfang14
FachzeitschriftPhase Transitions: a multinational journal
Jahrgang83
Ausgabenummer9
DOIs
PublikationsstatusVeröffentlicht - 2010

ÖFOS 2012

  • 103018 Materialphysik

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