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Capillary thinning of elastic and viscoelastic threads: From elastocapillarity to phase separation

H. V. M. Kibbelaar1, A. Deblais1,2, F. Burla3, G. H. Koenderink3,4, K. P. Velikov1,2,5, and D. Bonn1

  • 1Van der Waals–Zeeman Institute, Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
  • 2Unilever Innovation Centre Wageningen, Bronland 14, 6708 WH Wageningen, The Netherlands.
  • 3AMOLF, Department of Living Matter, 1098 XG Amsterdam, The Netherlands
  • 4Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2629 HZ Delft, The Netherlands
  • 5Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CC Utrecht, The Netherlands

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Phys. Rev. Fluids 5, 092001(R) – Published 22 September, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.092001

Abstract

The formation and destabilization of viscoelastic filaments are of importance in many industrial and biological processes. Filament instabilities have been observed for viscoelastic fluids but recently also for soft elastic solids. In this work, we address the central question of how to connect the dynamical behavior of viscoelastic liquids to that of soft elastic solids. We take advantage of a biopolymer material whose viscoelastic properties can be tuned over a very large range by its pH, and study the destabilization and ensuing instabilities in uniaxial extensional deformation. In agreement with very recent theory, we find that the interface shapes dictated by the instabilities converge to an identical similarity solution for low-viscosity viscoelastic fluids and highly elastic gels. We thereby bridge the gap between very fluid and strongly elastic materials. In addition, we provide direct evidence that at late times an additional filament instability occurs due to a dynamical phase separation.

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Outline

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Phys. Rev. Fluids 5, 092001(R)– Published 22 September, 2020
  • Received 15 April 2020
  • Accepted 20 August 2020
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