期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 1, 页码 63-67出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1118197108
关键词
colloids; shear-induced structure
资金
- Department of Energy, Basic Energy Sciences
- King Abdullah University of Science and Technology (KAUST) [KUS-C1-018-02]
- University of Chicago MRSEC
- National Science Foundation (NSF) [DMR-MRSEC 0820054]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [820054] Funding Source: National Science Foundation
Colloidal suspensions self-assemble into equilibrium structures ranging from face-and body-centered cubic crystals to binary ionic crystals, and even kagome lattices. When driven out of equilibrium by hydrodynamic interactions, even more diverse structures can be accessed. However, mechanisms underlying out-of-equilibrium assembly are much less understood, though such processes are clearly relevant in many natural and industrial systems. Even in the simple case of hard-sphere colloidal particles under shear, there are conflicting predictions about whether particles link up into string-like structures along the shear flow direction. Here, using confocal microscopy, we measure the shear-induced suspension structure. Surprisingly, rather than flow-aligned strings, we observe log-rolling strings of particles normal to the plane of shear. By employing Stokesian dynamics simulations, we address the mechanism leading to this out-of-equilibrium structure and show that it emerges from a delicate balance between hydrodynamic and interparticle interactions. These results demonstrate a method for assembling large-scale particle structures using shear flows.
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