Fast differential scanning calorimetry: new solutions in data treatment and applications to molecular glass-formers

Sonaglioni, Daniele; Tombari, E.; Capaccioli, S.

doi:10.1016/j.tca.2022.179385

Cited by 2 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to compare the scans collected in N 2 atmosphere and in vacuum, we have to correct for the aforementioned heat-losses (Schick & Mathot, 2016;Abate et al, 2022;Sonaglioni et al, 2023). To this aim, we applied the 'symmetric correction' and an additional small baseline mismatch correction (Abate et al, 2022) (more details in Appendix B1).…”

Section: Figurementioning

confidence: 99%

“…A small shift can be observed between the curves. This can be explained in terms of a thermal-lag effect: in chip-based calorimeters, the role of the gas as a heatexchange medium is crucial (Schick & Mathot, 2016), and in the absence of the gas the thermal lag is expected to change and possibly require 'non-symmetric' correction terms (Sonaglioni et al, 2023) which are partially taken into account here with the aforementioned baseline mismatch correction (Abate et al, 2022).…”

Section: Figurementioning

confidence: 99%

“…Fast scanning nano-calorimeters can reach heating and cooling rates that are orders of magnitude higher than those of traditional differential scanning calorimeters. The data analysis required to convert the measured power to specific heat data has been discussed in specialized contributions (Schick & Mathot, 2016;Abate et al, 2022;Sonaglioni et al, 2023). Here we simply want to discuss the procedure used to obtain the data reported in Fig.…”

Section: B1 Heat-flow Baseline Correctionmentioning

confidence: 99%

“…terms that are not opposite to one another during symmetric heating and cooling cycles, have also to be considered, making the symmetric correction no longer fully satisfactory. This can be encountered, for example, when thermal lags are present (Sonaglioni et al, 2023). In such situations, an additional 'non-symmetric' term must be included, which in first approximation corresponds to a small baseline rotation correction.…”

Section: B1 Heat-flow Baseline Correctionmentioning

confidence: 99%

See 3 more Smart Citations

A new experimental setup for combined fast differential scanning calorimetry and X-ray photon correlation spectroscopy

Martinelli,

Baglioni,

Sun

et al. 2024

J Synchrotron Radiat

View full text Add to dashboard Cite

Synchrotron-radiation-based techniques are a powerful tool for the investigation of materials. In particular, the availability of highly brilliant sources has opened the possibility to develop techniques sensitive to dynamics at the atomic scale such as X-ray photon correlation spectroscopy (XPCS). XPCS is particularly relevant in the study of glasses, which have been often investigated at the macroscopic scale by, for example, differential scanning calorimetry. Here, we show how to adapt a Flash calorimeter to combine XPCS and calorimetric scans. This setup paves the way to novel experiments requiring dynamical and thermodynamic information, ranging from the study of the crystallization kinetics to the study of the glass transition in systems that can be vitrified thanks to the high cooling rates reachable with an ultrafast calorimeter.

show abstract

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: B1 Heat-flow Baseline Correctionmentioning

confidence: 99%

Section: B1 Heat-flow Baseline Correctionmentioning

confidence: 99%

See 2 more Smart Citations

A new experimental setup for combined fast differential scanning calorimetry and X-ray photon correlation spectroscopy

Martinelli,

Baglioni,

Sun

et al. 2024

J Synchrotron Radiat

View full text Add to dashboard Cite

show abstract

Physical aging in molecular glasses beyond the α relaxation

Di Lisio,

Stavropoulou,

Cangialosi

2023

The Journal of Chemical Physics

View full text Add to dashboard Cite

The description of kinetics of physical aging, namely the slow evolution of a glass thermodynamic state toward equilibrium, generally relies on the exclusive role of the main α relaxation. Here, we study the kinetics of physical aging over a wide temperature range in five small molecules interacting via van der Waals forces monitoring the time evolution of the glass enthalpic state. To this aim, we employ fast scanning calorimetry, which permits exploring a wide range of aging times. To challenge the role of the α relaxation in the description of physical aging, we employ a model-independent approach, based on the time to reach equilibrium, and a modified version of the single parameter aging model. The latter accounts for the non-linearity of aging making use of the so-called density scaling approach to describe the dependence of the α relaxation time on the glass thermodynamic state. We show that the α relaxation is generally adequate to describe aging at temperatures close to the glass transition and, for lower temperatures, the latest stages of equilibration. In contrast, at low aging temperatures, it fails to catch a wide portion of the time-dependent evolution of the glass thermodynamic state, which is found to be much faster than predicted considering only the α relaxation. Hence, our results and analysis provide compelling arguments that the description of glass equilibration under a wide range of aging conditions is conveyed by different molecular mechanisms, beyond the mere role of the α relaxation.

show abstract

Fast differential scanning calorimetry: new solutions in data treatment and applications to molecular glass-formers

Cited by 2 publications

References 26 publications

A new experimental setup for combined fast differential scanning calorimetry and X-ray photon correlation spectroscopy

A new experimental setup for combined fast differential scanning calorimetry and X-ray photon correlation spectroscopy

Physical aging in molecular glasses beyond the α relaxation

Contact Info

Product

Resources

About