What is it about?
This study challenges the traditional idea that viscosity decoupling in liquids always indicates dynamic heterogeneity, which is when different parts of a liquid behave differently. Using fluorescence correlation spectroscopy (FCS), the researchers developed a method to selectively study molecular populations, revealing that viscosity decoupling can occur even in homogeneous systems.
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Why is it important?
Viscosity decoupling has long been used to identify dynamic heterogeneity in liquids, but this study shows that this assumption can be misleading. By developing a novel method to selectively analyze different molecular populations using fluorescence correlation spectroscopy (FCS), the research provides a more accurate way to distinguish homogeneous from heterogeneous dynamics in complex liquids like deep eutectic solvents. This work has broad implications for understanding liquid behaviour.
Perspectives
This research highlights the complexity of liquid dynamics, moving beyond traditional interpretations of viscosity. It’s fascinating to see how advanced techniques like FCS can reveal subtle behaviors in liquids that were previously overlooked. This study opens doors for better experimental designs and applications in understanding the molecular world, from industrial solvents to biological systems.
Dr. Nilimesh Das
Harvard University
Read the Original
This page is a summary of: Viscosity decoupling does not guarantee dynamic heterogeneity: A way out, Journal of Photochemistry and Photobiology A Chemistry, March 2023, Elsevier,
DOI: 10.1016/j.jphotochem.2022.114361.
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