期刊
NANO LETTERS
卷 18, 期 9, 页码 5418-5425出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01640
关键词
Granular material; in situ TEM; atomic force microscopy; nanoindentation; layer-by-layer; capillary condensation; porous materials
类别
资金
- UPENN MRSEC
- NSF [DMR-1720530, CMMI-1662695, DMR-1120901]
- Ashton Foundation
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.
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