Young's modulus of polyelectrolyte multilayers from microcapsule swelling
O. I. Vinogradova, D. Andrienko, V. V. Lulevich, S. Nordschild, and G., B. Sukhorukov
TL;DR
This study estimates the Young's modulus of polyelectrolyte multilayers by analyzing osmotically induced swelling in microcapsules, revealing their elastic properties and strong interlayer interactions.
Contribution
It introduces a method to measure Young's modulus of multilayer films using microcapsule swelling, providing new insights into their elastic behavior.
Findings
Young's modulus estimated around 100 MPa
Capsule swelling correlates with polyelectrolyte concentration and shell thickness
Multilayers exhibit elastomer-like elastic properties
Abstract
We measure Young's modulus of a free polyelectrolyte multilayer film by studying osmotically induced swelling of polyelectrolyte multilayer microcapsules filled with the polyelectrolyte solution. Different filling techniques and core templates were used for the capsule preparation. Varying the concentration of the polyelectrolyte inside the capsule, its radius and the shell thickness yielded an estimate of an upper limit for Young's modulus of the order of 100 MPa. This corresponds to an elastomer and reflects strong interactions between polyanions and polycations in the multilayer.
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