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DTSTART;TZID=America/New_York:20190626T153000
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DTSTAMP:20190624T193409Z
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SUMMARY:MEAM Seminar: "Effect of Nanoparticle Size on the Mechanical Properties of Nanoparticle (NP) Assemblies"
DESCRIPTION:Nanoparticle assemblies (NPAs) have attracted tremendous interests of various research communities. The particle-size-effect on mechanical properties of NPAs is systematically studied. With decreasing the particle size d from 300 nm to 10 nm\, the SiO2 NPAs become drastically harder (∼39×)\, stiffer (∼15×)\, and tougher (>3.5×). The results are consistent with the data scattered in the literature for various nanoparticle (NP) systems\, indicating a fundamentally universal d-effect for all NPAs. A model is developed to correlate the hardness and the NP junction (NPJ) strength f. Here\, f is mainly due to van der Waals and capillary interactions\, roughly a constant (140 nN) for d = 100–300 nm\, and then f decreases with decreasing d from ∼100 nm. The deformation mechanism of NPAs (for indentation depth ≫d) is shear plasticity involving shear breaking of NPJs. The fundamental mechanism for the d-effect is that\, with decreasing d\, the NPJ’s planar density increases much faster than the decrease of f. Moreover\, three deformation mechanisms of NPAs\, (1) nanoparticle dislodging\, (2) shear-band formation\, and (3) cracking are naturally d-dependent. These new findings can provide important insights into the fundamental understanding of the inter-NP interaction\, the mechanical behavior of the NPAs\, and the design of robust NP-based devices. If time allows\, as an independent topic\, the experimental characterization of freestanding membrane will also be briefly discussed.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-effect-of-nanoparticle-size-on-the-mechanical-properties-of-nanoparticle-np-assemblies/
LOCATION:Moore 212
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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