Extreme mechanics of colloidal polymers under compression: Buckling, creep, and break-up

Simon G. Stuij, Andreas Biebricher, Zhe Gong, Stefano Sacanna, Erwin Peterman, Iddo Heller, Peter Schall

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Self-assembling patchy colloidal particles form a promising platform to create designer soft materials. To dress such systems with mechanical functionality, one can take inspiration from biological structures such as the cell's cytoskeleton, which consists of semiflexible filaments, whose mechanical behavior give the cell its unique mechanical properties. Here we present mechanical experiments on analogs of biological fibers, semiflexible "colloidal polymers"made from bonded patchy colloidal particles. We use optical tweezers to probe their extreme mechanics under increasingly high compressions and we reveal a rich nonlinear mechanical response involving buckling, viscoelastic creep, and ultimately break-up. We characterize and model this response using elastic and viscoelastic models involving Euler buckling and stress relaxation. This allows us to identify the critical Euler buckling force, and relate the critical bending at break-up to the finite patch size of the colloids. These results demonstrate the crucial role of the patch-patch interactions in the mechanics of self-assembled colloidal materials, and they provide mechanical relationships that are essential to design functional colloidal architectures inspired by nature.

Original languageEnglish
Article number035603
Pages (from-to)1-9
Number of pages9
JournalPHYSICAL REVIEW MATERIALS
Volume6
Issue number3
DOIs
Publication statusPublished - 25 Mar 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

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