期刊
SOFT MATTER
卷 11, 期 42, 页码 8313-8321出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm01693b
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资金
- SNSF [PP00P2_144646/1, IZK0Z2_142110/1]
- National Institutes of Health [HL-51177]
- Swiss National Science Foundation (SNF) [IZK0Z2_142110] Funding Source: Swiss National Science Foundation (SNF)
We experimentally study the link between structure, dynamics and mechanical response of two-dimensional (2D) binary mixtures of colloidal microparticles spread at water/oil interfaces. The particles are driven into steady shear by a microdisk forced to rotate at a controlled angular velocity. The flow causes particles to layer into alternating concentric rings of small and big colloids. The formation of such layers is linked to the local, position-dependent shear rate, which triggers two distinct dynamical regimes: particles either move continuously (Flowing'') close to the microdisk, or exhibit intermittent Hopping'' between local energy minima farther away. The shear-rate-dependent surface viscosity of the monolayers can be extracted from a local interfacial stress balance, giving macroscopic'' flow curves whose behavior corresponds to the distinct microscopic regimes of particle motion. Hopping regions reveal a higher resistance to flow compared to the flowing regions, where spatial organization into layers reduces dissipation.
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