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Crystal to crystal transformation in soft ionic microgels: Kinetics and the role of local mechanical susceptibilities

Saswati Ganguly1,2,*, Sofi Nöjd3, Anand Yethiraj4, Peter Schurtenberger3, and Priti S. Mohanty3,5,†

  • 1Soft Condensed Matter Theory, Department of Physics, University of Konstanz, 78457 Konstanz, Germany
  • 2Institute of Materials Physics in Space, German Aerospace Center (DLR), 51170 Cologne, Germany
  • 3Division of Physical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
  • 4Department of Physics and Physical Oceanography, Memorial University, St. John's, Newfoundland NL A1B 3X7, Canada
  • 5School of Chemical Technology and Biotechnology, Kalinga Institute of Industrial Technology (KIIT), Deemed to be University, Bhubaneswar 751024, India

  • *Corresponding author: saswati.ganguly@uni-konstanz.de
  • †Corresponding author: pritisundar.mohanty@kiitbiotech.ac.in
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Phys. Rev. Materials 7, L080401 – Published 28 August, 2023

DOI: https://doi.org/10.1103/PhysRevMaterials.7.L080401

Abstract

We report confocal microscopy experiments of electric-field-driven crystal-crystal transformations in microgel colloids with varying particle softness. The transformation kinetics are well described by phenomenological nucleation and growth theory. Using a spatial projection formalism, we determine local susceptibilities to affine shear deformation and nonaffine defect formation in the parent crystal. Curiously, the softer particles have lower shear strain susceptibility, while nonaffine susceptibility and phenomenological growth coefficients depend nonmonotonically on particle softness.

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Phys. Rev. Materials 7, L080401– Published 28 August, 2023
  • Received 22 November 2022
  • Revised 25 July 2023
  • Accepted 1 August 2023
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