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Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
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Unconstrained dynamic gel swelling generates transient surface deformations.

Alyssa VanZanten1, Shih-Yuan Chen2, Michelle M Driscoll2

  • 1Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, USA. szcz@msu.edu.

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Polymer gels exhibit dynamic surface deformations during swelling. Manipulating network constraints and solvent properties controls swelling speed and surface pattern evolution for advanced material applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Polymer gels possess cross-linked networks capable of mechanical deformation during swelling and de-swelling.
  • Gels are utilized in applications like membranes, water capture, and drug delivery due to their stress-generating and dissipating capabilities.
  • Research often focuses on equilibrium states, with limited characterization of unsteady-state swelling and associated surface deformations.

Purpose of the Study:

  • To investigate the manipulation of swelling kinetics and surface deformations in poly(ethylene glycol) gels during unconstrained, 3D swelling.
  • To understand the influence of internal network constraints and external diffusive pressure on gel behavior.
  • To establish a framework for dynamic deformation in soft materials.

Main Methods:

  • Utilized poly(ethylene glycol) gels with varying cross-linker molecular weights.
  • Investigated swelling kinetics and surface deformations in both water and ethanol.
  • Measured surface pattern evolution during the unsteady-state swelling regime.

Main Results:

  • Increasing cross-linker molecular weight prolonged equilibrium time by increasing solvent uptake.
  • Swelling in ethanol reduced solvent uptake while also increasing equilibrium time.
  • Fast surface relaxation occurred within the first five minutes, with pattern density and persistence dependent on solvent quality.

Conclusions:

  • Internal network constraints and solvent quality significantly influence gel swelling kinetics and surface dynamics.
  • The study provides a framework for controlling transient surface properties in soft materials.
  • Findings enable engineering of smart anti-fouling surfaces and sensors by managing material instabilities.