Folding Wrinkles of a Thin Stiff Layer on a Soft Substrate

We present the mechanics of folding surface-layer wrinkles on a soft substrate, i.e. inter-touching of neighbouring wrinkle surfaces without forming a cusp. The wrinkle folding is applicable to construction of long parallel nano/micro-channels and control of exposing functional surface areas.

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Mechanisms of Nanotube Cutting by Ultra-Sonication

We conduct molecular dynamics simulation to understand the mechanisms of sonication induced cutting of single-walled carbon nanotubes, and compare these results directly with experiments. A new atom shooting fracture has been uncovered.

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Irradiation Controlled Nanopores in Amorphous Carbon for Energy and Environment Material Applications

We study the nanovoid evolution in amorphous carbon structures during ion bombardment. The objective is to use these porous structures for energy and environment material applications.

For more details, contact: hbchew@illinois.edu

We show how nano-sand particles on the nanostructures of desert reptiles, like the boa snake or sandfish, act as nanobearings which protect the skin of these reptiles from excessive wear.

The novel nonlinear field projection method was developed to bridge the molecular level to the continuum scale to study the GB dislocation emission and some Pb locks the local GB slip and in turn, embrittles the GB.

Nanobearing Friction in Nature

Nanomechanics of Grain Boundary Embrittlement

For more details, contact: hsiao-mei_wu@brown.edu

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In-situ non-uniform thickness variations are measured by an ESPI and pressure variations are observed by a high resolution distributed-pressure-sensor pad. Understanding the gas migration and formation, which must be bridged to microstructural behaviors helps us to characterize the cyclic performance of battery cells and improve structural design of battery packing.

In-situ Observation of Deformation in a Li-Ion Battery
during Charging and Discharging

For more details, contact: hsiao-mei_wu@brown.edu

We uncover three new nanoplasticity mechanisms, operating in highly stressed interstitial-rich regions in face-centred-cubic (FCC) metals, which are particularly important in understanding evolution of surface stress and morphology of a FCC metal under low-energy noble-gas ion bombardments.

Nanoscale mechanisms of surface stress and morphology evolution in FCC metals under noble-gas ion bombardments

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