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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Does Viscosity Drive the Dynamics in an Alcohol-Based Deep Eutectic Solvent?

Srijan Chatterjee1,2, Samadhan H Deshmukh1,2, Sayan Bagchi1,2

  • 1Physical and Materials Chemistry Division, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune411008, India.

The Journal of Physical Chemistry. B
|October 6, 2022
PubMed
Summary
This summary is machine-generated.

Deep eutectic solvents exhibit complex dynamics. Solute reorientation scales with bulk viscosity, but solvation dynamics depend on local, domain-specific viscosity within the hydrogen-bonded network.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Deep eutectic solvents (DES) are viscous fluids with heterogeneous nanodomains.
  • Viscosity significantly impacts neoteric solvent dynamics, similar to ionic liquids.
  • Understanding DES viscosity is key to unlocking their full application potential.

Purpose of the Study:

  • To elucidate the impact of viscosity on the dynamics of an alcohol-based DES, ethaline.
  • To compare solvation dynamics and solute reorientation in ethaline versus its constituent, ethylene glycol.
  • To investigate whether solute dynamics sense bulk or local viscosity in DES.

Main Methods:

  • Polarization-selective pump-probe spectroscopy
  • Two-dimensional infrared (2D IR) spectroscopy
  • Molecular dynamics (MD) simulations

Main Results:

  • Solute reorientation time scales appear to correlate with the bulk viscosity of ethaline.
  • Overall solvation dynamics do not scale with bulk viscosity.
  • Solute senses domain-specific local viscosity, not bulk viscosity, influenced by hydrogen bond network dynamics.

Conclusions:

  • Solute behavior in DES is governed by local microenvironments, not bulk properties.
  • Hydrogen bond network dynamics dictate the effective viscosity experienced by solutes.
  • Targeting domain-specific viscosity is crucial for optimizing DES applications.