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Contact laws between nanoparticles: the elasticity of a nanopowder
- Source :
- Nanoscale, Nanoscale, Royal Society of Chemistry, 2018, 10 (4), pp.2154-2161. ⟨10.1039/c7nr07540e⟩, Nanoscale, Royal Society of Chemistry, 2018, 10 (4), pp.2154-2161. ⟨10.1039/C7NR07540E⟩
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- International audience; Studies of the mechanical contact between nanometer-scale particles provide fundamental insights into the mechanical properties of materials and the validity of contact laws at the nanoscale which are still under debate for contact surfaces approaching atomic dimensions. Using in situ Brillouin light scattering under high pressure, we show that effective medium theories successfully predict the macroscopic sound velocities in nanopowders if one takes into account the cementation of the contacts Our measurements suggest the relevance of the continuum approach and effective medium theories to describe the contact between nanoparticles of diameters as small as 4 nm, i.e. with radii of contact of a few angstroms. In particular, we demonstrate that the mechanical properties of nanopowders strongly depend on the surface state of the nanoparticles. The presence of molecular adsorbates modifies significantly the contact laws.
- Subjects :
- [PHYS]Physics [physics]
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
Materials science
Nanoparticle
02 engineering and technology
Elasticity (physics)
021001 nanoscience & nanotechnology
01 natural sciences
Light scattering
Brillouin zone
Contact surfaces
Law
0103 physical sciences
General Materials Science
Angstrom
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
010306 general physics
0210 nano-technology
Material properties
Nanoscopic scale
ComputingMilieux_MISCELLANEOUS
Subjects
Details
- Language :
- English
- ISSN :
- 20403364 and 20403372
- Database :
- OpenAIRE
- Journal :
- Nanoscale, Nanoscale, Royal Society of Chemistry, 2018, 10 (4), pp.2154-2161. ⟨10.1039/c7nr07540e⟩, Nanoscale, Royal Society of Chemistry, 2018, 10 (4), pp.2154-2161. ⟨10.1039/C7NR07540E⟩
- Accession number :
- edsair.doi.dedup.....2e8a50d1055415e49b1b3e005201a52c