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Journal article
Pinning dislocations in colloidal crystals with active particles that seek stacking faults
Soft matter, v 16(17), pp 4182-4191
07 May 2020
PMID: 32286580
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
There is growing interest in functional, adaptive devices built from colloidal subunits of micron size or smaller. A colloidal material with dynamic mechanical properties could facilitate such microrobotic machines. Here we study via computer simulation how active interstitial particles in small quantities can be used to modify the bulk mechanical properties of a colloidal crystal. Passive interstitial particles are known to pin dislocations in metals, thereby increasing resistance to plastic deformation. We extend this tactic by employing anisotropic active interstitials that travel super-diffusively and bind strongly to stacking faults associated with partial dislocations. We find that: (1) interstitials that are effective at reducing plasticity compromise between strong binding to stacking faults and high mobility in the crystal bulk. (2) Reorientation of active interstitials in the crystal depends upon rotational transitions between high-symmetry crystal directions. (3) The addition of certain active interstitial shapes at concentrations as low as 60 per million host particles (0.006%) can create a shear threshold for dislocation migration. This work demonstrates how active materials in a dense matrix can locally sense their environment and lead to bulk property changes.
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Details
- Title
- Pinning dislocations in colloidal crystals with active particles that seek stacking faults
- Creators
- Bryan VanSaders - University of Michigan–Ann ArborSharon C. Glotzer - University of Michigan–Ann Arbor
- Publication Details
- Soft matter, v 16(17), pp 4182-4191
- Publisher
- Royal Society of Chemistry
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000532303400007
- Scopus ID
- 2-s2.0-85084379886
- Other Identifier
- 991021877482004721
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Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Physics, Multidisciplinary
- Polymer Science