Applicability of the macro-scale elastic contact theories for the prediction of nano-scaled particle collision with a rigid flat surface under non-adhesive and weakly-adhesive conditions

Jung, Sung Eun; Bang, Jong Geun; Yoon, Woong-Sup

doi:10.1016/j.jaerosci.2012.02.006

Cited by 16 publications

(8 citation statements)

References 24 publications

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“…The model of Wang and John is based on the assumption of a plate capacitor, where the area of the capacitor was calculated according to Hertz's theory. The validity of the Hertz's equations for nanoparticles was recently shown by Jung et al (2012). However, the observed plateaus cannot be explained by the established theory as a constant contact area over a broad range of impact velocity does not make any physical sense.…”

Section: Charge Transfer From Conducting Bulk Surfacesmentioning

confidence: 97%

“…However, their mechanical behavior at extremely high strain rates of the order 10 9 s − 1 that occur in nanoparticle surface collisions due to the extremely short contact duration of some 10 ps is so far unclear. Jung et al (2012) showed in Molecular Dynamics (MD)-simulations that continuum mechanical approaches are suitable to describe nanoparticle surface collisions in the elastic and near plastic regime if "effective" material parameters are used for Young's modulus and yield strength. An experimental procedure to determine such effective parameters is so far missing.…”

Section: Introductionmentioning

confidence: 99%

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Charge Transfer to Metal Nanoparticles Bouncing from Conductive Surfaces

Rennecke

Weber

2014

Aerosol Science and Technology

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The charging behavior of metal nanoparticles bouncing from conductive surfaces was investigated in a single-stage-lowpressure-impactor. Ag and P t particles of a fixed particle size between 20 nm and 100 nm were impacted on targets of bulk Au and P t, respectively, and the resulting contact charge was measured as a function of impact velocity. The influence of target hardness was revealed by the comparison to measurements with soft nanostructured layers obtained by direct current sputtering of Au and P t on mica discs. From the dataset, regions of elastic, elastoplastic, and fully plastic particle deformation were identified, and the size-dependent effective yield stress for the respective particle materials was calculated. The influence of electron back-tunneling in the separation phase of the collision on the effective contact charge is discussed.

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Section: Charge Transfer From Conducting Bulk Surfacesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Charge Transfer to Metal Nanoparticles Bouncing from Conductive Surfaces

Rennecke

Weber

2014

Aerosol Science and Technology

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“…To this end, we study a Lennard-Jones (LJ) material. We note that this (computationally) important system has already been used repeatedly in previous work for studying NP collisions [9][10][11][12][13][14][15][16]. However, some of these simulations have been performed at higher collision energies (leading to NP fragmentation), or with strongly modified potentials, which strongly alter the collision dynamics.…”

Section: Introductionmentioning

confidence: 99%

Bouncing window for colliding nanoparticles: Role of dislocation generation

et al. 2019

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Available macroscopic theories-such as the Johnson-Kendall-Roberts (JKR) model-predict spherical particles to stick to each other at small collision velocities v; above the bouncing velocity, v b , they bounce. We study the details of the bouncing threshold using molecular dynamics simulation for crystalline nanoparticles where atoms interact via the Lennard-Jones potential. We show that the bouncing velocity strongly depends on the nanoparticle orientation during collision; for some orientations, nanoparticles stick at all velocities. The dependence of bouncing on orientation is caused by energy dissipation during dislocation activity. The bouncing velocity decreases with increasing nanoparticle radius in reasonable agreement with JKR theory. For orientations for which bouncing exists, nanoparticles stick again at a higher velocity, the fusion velocity, v f , such that bouncing only occurs in a finite range of velocities-the bouncing window. The fusion velocity is rather independent of the nanoparticle radius.

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“…Because of the simplicity of the setup, NP collisions have been frequently studied, and results on the restitution coefficient [25], NP bouncing off a surface or off other NPs [26,27], grain mixing [28], fragmentation [29,30], and the occurrence of inelastic processes [31] have been reported. Because of the simplicity of the setup, NP collisions have been frequently studied, and results on the restitution coefficient [25], NP bouncing off a surface or off other NPs [26,27], grain mixing [28], fragmentation [29,30], and the occurrence of inelastic processes [31] have been reported.…”

Section: Introductionmentioning

confidence: 99%

The elastic–plastic transition in nanoparticle collisions

Millán

Tramontina

Urbassek

et al. 2016

Phys. Chem. Chem. Phys.

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When nanoparticles (NPs) collide with low velocities, they interact elastically in the sense that--besides their fusion caused by their mutual van-der-Waals attraction--no defects are generated. We investigate the minimum velocity, vc, necessary for generating defects and inducing plasticity in the NP. The determination of this elastic-plastic threshold is of prime importance for modeling the behavior of granular matter. Using the generic Lennard-Jones interaction potential, we find vc to increase strongly with decreasing radius. Current models do not agree with our simulations, but we provide a model based on dislocation emission in the contact zone that quantitatively describes the size dependence of the elastic-plastic transition.

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Applicability of the macro-scale elastic contact theories for the prediction of nano-scaled particle collision with a rigid flat surface under non-adhesive and weakly-adhesive conditions

Cited by 16 publications

References 24 publications

Charge Transfer to Metal Nanoparticles Bouncing from Conductive Surfaces

Charge Transfer to Metal Nanoparticles Bouncing from Conductive Surfaces

Bouncing window for colliding nanoparticles: Role of dislocation generation

The elastic–plastic transition in nanoparticle collisions

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