Stress fields at boundaries between contacting particles

Thölén, A.R.

doi:10.1007/s10853-006-0092-x

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…The image shows no bulk lattice defect such as dislocations, grain boundaries or twinning. Contrasts were only observed at the contact points of the nanocubes, and were attributed to the stress field induced by the elastic compression of the lattice [46]. None of the imaged nanocubes was found to contain bulk lattice defects.…”

Section: Nanocube Experimental Synthesis and Characterizationmentioning

confidence: 97%

In situ investigation of MgO nanocube deformation at room temperature

et al. 2015

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The mechanical behavior of h1 0 0i-oriented MgO nanocubes is investigated using in situ transmission electron microscopy (TEM) compression tests at room temperature and molecular dynamics simulations. Experiments show high strength and ductility, in addition to specific deformation mechanisms interpreted by the simulation. The nucleation and the propagation of 1/2h1 1 0i{1 1 0} dislocations are at the onset of the plastic deformation. The different deformation processes as well as the possible formation of a dislocation network during compression are discussed.

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Section: Nanocube Experimental Synthesis and Characterizationmentioning

confidence: 97%

In situ investigation of MgO nanocube deformation at room temperature

et al. 2015

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“…These bands of contrast in the image result from the local displacement of the lattice planes and indicate an elastic deformation [23]. Observations of these strain fields can also provide quantitative information about the stresses incurred by the particle [24,25]. Continued loading ultimately induced plastic deformation in the particle, which fractured into two pieces.…”

Section: Resultsmentioning

confidence: 99%

Fracturing a nanoparticle

Nowak

Mook

Minor

et al. 2007

Philosophical Magazine

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Conventional wisdom and indirect studies suggest that the mechanical properties of nanoparticles can be considerably different than their bulk properties would predict. However, little is actually known about their mechanical behaviour because of the practical difficulties in investigating individual particles. Direct experimental studies of these properties require knowledge of the crystallographic orientation, size and microstructure of the nanoparticle in order to be complete. By deforming a single nanoparticle in the transmission electron microscope we have been able to determine each of these parameters of an isolated silicon nanoparticle a priori. With this approach, we could then directly examine dynamic deformation processes and demonstrate the first direct observation of plasticity-induced cleavage fracture of a silicon nanoparticle in compression.

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“…Halder and Ravishankar [3] formed Au nanowires by adhesion of Au nanoparticles along their {111} facets. Interestingly, planar faults are often observed after nanoparticle adhesion; e.g., twin-boundaries and stacking faults were observed as a result of Au nanoparticle adhesion [3,18]. Despite the fact that stacking faults were observed, no dislocations were identified within the nanoparticles during adhesive contact [3,17,18].…”

Section: Lf13001 R Ementioning

confidence: 99%

“…Interestingly, planar faults are often observed after nanoparticle adhesion; e.g., twin-boundaries and stacking faults were observed as a result of Au nanoparticle adhesion [3,18]. Despite the fact that stacking faults were observed, no dislocations were identified within the nanoparticles during adhesive contact [3,17,18]. A priori, the absence of dislocations within the nanoparticles following contact would suggest that * Electronic address: danmord@tx.technion.ac.il the resultant deformation is purely elastic.…”

Section: Lf13001 R Ementioning

confidence: 99%

Pseudoelastic Deformation during Nanoscale Adhesive Contact Formation

2011

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Molecular dynamics simulations are employed to demonstrate that adhesive contact formation through classical jump to contact is mediated by extensive dislocation activity in metallic nanoparticles. The dislocations generated during jump to contact are completely annihilated by the completion of the adhesive contact, leaving the nanoparticles dislocation-free. This rapid and efficient jump to contact process is pseudoelastic, rather than purely elastic or plastic.

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Stress fields at boundaries between contacting particles

Cited by 6 publications

References 14 publications

In situ investigation of MgO nanocube deformation at room temperature

In situ investigation of MgO nanocube deformation at room temperature

Fracturing a nanoparticle

Pseudoelastic Deformation during Nanoscale Adhesive Contact Formation

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