Disordered Nanoparticle Packings under Local Stress Exhibit Avalanche-Like, Environmentally Dependent Plastic Deformation
| Autor: | Jyo Lyn Hor, Robert W. Carpick, Jason P. Mulderrig, Joel A. Lefever, Daeyeon Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
education.field_of_study
Materials science Capillary condensation Mechanical Engineering Population Bioengineering 02 engineering and technology General Chemistry Nanoindentation 021001 nanoscience & nanotechnology Condensed Matter Physics Granular material 01 natural sciences Stress (mechanics) 0103 physical sciences Particle General Materials Science Shear matrix Composite material 010306 general physics 0210 nano-technology education Porous medium |
| Zdroj: | Nano Letters. 18:5418-5425 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.8b01640 |
| Popis: | Nanoindentation experiments on disordered nanoparticle packings performed both in an atomic force microscope and in situ in a transmission electron microscope are used to investigate the mechanics of plastic deformation. Under an applied load, these highly porous films exhibit load drops, the magnitudes of which are consistent with an exponential population distribution. These load drops are attributed to local rearrangements of a small number of particles, which bear similarities to shear transformation zones and to the T1 process, both of which have been previously predicted for disordered packings. An increase in the relative humidity results in an increase in the number of observed load drops, indicating that the strength of the particle interactions has a significant effect on the modes of plastic deformation. These results suggest how disordered nanoparticle packings may be expected to behave in devices operating under varying environments. |
| Databáze: | OpenAIRE |
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