Phase transitions in polymorphic materials probed using space-resolved diffusing wave spectroscopy

Soft Matter
Med Yassine NagaziL Cipelletti

Abstract

We use space-resolved dynamic light scattering in the highly multiple scattering regime (Photon Correlation Imaging Diffusing Wave Spectroscopy, PCI-DWS) to investigate temperature-induced phase transitions in polymorphic materials. We study paraffin wax as a simple model system and chocolate, a prototypical example of fat-based products exhibiting complex, history-dependent phase transitions. We find that microscopic dynamics measured using PCI-DWS show remarkable, non-monotonic behavior upon heating: they transiently accelerate when crossing phase transition and slow down above the transition temperature. Sub-micron resolution measurements of the local drift of the sample surface reveal that the speed-up of the dynamics is due to the strain field induced by the change in density at transition temperature. The transition temperatures obtained from PCI-DWS are found to be in excellent agreement with those inferred from complementary differential scanning calorimetry and X-ray scattering experiments, thereby validating PCI-DWS as a new, powerful tool for the characterization of phase transitions in complex soft matter. Finally, we demonstrate the unique possibilities afforded by space-resolved DWS by investigating the spatially ...Continue Reading

References

Aug 1, 1966·Journal of the American Oil Chemists' Society·R L Wille, E S Lutton
Nov 1, 1989·Physical Review. B, Condensed Matter·F C MacKintoshD A Weitz
Dec 31, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Agnès DuriLuca Cipelletti
Nov 13, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Marion ErpeldingJérôme Crassous
Nov 7, 2012·Nanoscale Research Letters·Tun-Ping Teng, Chao-Chieh Yu
Sep 30, 2016·Scientific Reports·Hanne M van der KooijJoris Sprakel
Dec 3, 2016·Scientific Reports·Zeinab HajjarianSeemantini K Nadkarni
May 4, 2017·Advanced Materials·Hanne M van der KooijJoris Sprakel

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Methods Mentioned

BETA
light microscopy
X-ray
light scattering
X ray
differential scanning calorimetry
X
dynamic light scattering

Software Mentioned

Fit2D

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