Collision of Clusters with Surfaces: Deposition, Surface Modification and Scattering

Harbich, W.

doi:10.1007/978-3-642-57169-5_4

Cited by 22 publications

(14 citation statements)

References 165 publications

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“…Note that this attractive force between fine powders is in-avoidable, because it originates in the inter-atomic forces such as van-der Waals force. As a result, a variety of processes in collisions of fine powders can be observed depending on their impact speeds [35]. Nano-powders fragment into atoms [36,37] or several large components or bury themselves on walls [38,39] for sufficiently high speed impacts.…”

Section: Introductionmentioning

confidence: 99%

Effect of elastic vibrations on normal head-on collisions of isothermal spheres

Murakami

Hayakawa

2014

Phys. Rev. E

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We numerically investigate head on collisions of isothermal visco-elastic spheres. We find that the restitution coefficient oscillates against the impact speed if the solid viscosity inside the sphere is small enough. We confirm that the oscillation arises from the resonance between the duration of contact and the eigen-frequencies of the sphere. This oscillation disappears if there exists the strong solid viscosity in spheres. We also find that a sinusoidal behavior of the restitution coefficient against the initial phase in the eigenmodes for collisions between a thermally activated sphere and a flat wall. As a result, the restitution coefficient can exceed unity if the impact speed of the colliding sphere is nearly equal to or slower than the thermal speed. We have confirmed the existence of the fluctuation theorem for impact processes through our simulation.

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Section: Introductionmentioning

confidence: 99%

Effect of elastic vibrations on normal head-on collisions of isothermal spheres

Murakami

Hayakawa

2014

Phys. Rev. E

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“…The literature on the topic is flourishing and many conferences have been (fully or partly) devoted to these researches, see for example the series of recent ISSPIC conferences [2,3,4,5]. It is now possible to make a direct deposition of size selected clusters on a substrate [6,7]. This opens up new possibilities for the synthesis of nano-structured surfaces.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of cluster deposition on Ar surface

et al. 2007

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Abstract. Using a combined quantum mechanical/classical method, we study the dynamics of deposition of small Na clusters on Ar(001) surface. We work out basic mechanisms by systematic variation of substrate activity, impact energy, cluster orientations, cluster sizes, and charges. The soft Ar material is found to serve as an extremely efficient shock absorber which provides cluster capture in a broad range of impact energies. Reflection is only observed in combination with destruction of the substrate. The kinetic energy of the impinging cluster is rapidly transfered at first impact. The distribution of the collision energy over the substrate proceeds very fast with velocity of sound. The full thermalization of ionic and atomic energies goes at a much slower pace with times of several ps. Charged clusters are found to have a much stronger interface interaction and thus get in significantly closer contact with the surface.

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“…Thus, the kinetic energy of the nanoparticles was mainly defined by the pressure difference between the aggregation and deposition chamber. In this case of low-energy deposition the energy per atom E at is about 0.1 eV/atom, which is far below the cohesive energy of the atoms constituting the NPs and nanoparticles do not undergo significant distortion of their shape and size [ 42 – 43 ]. Nanoparticles of different mean dimensions were produced by changing the aggregation-zone length from D = 50 mm to D = 100 mm.…”

Section: Resultsmentioning

confidence: 99%

“…Even if a minority of multi-charged NPs (doubly/triply charged) exists and the maximum substrate voltage V s = 4.5 kV is applied, the energy per atom will still be below 1 eV/atom, which is still below the cohesive energy of hafnium. Thus, from these energy values we expect mainly the deformation of the NPs [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

“…The cohesive energy can be regarded as the required energy to separate the metallic crystal into individual atoms by destroying the metallic bonds [ 57 ]. During soft landing the energy per atom stays well below the cohesive energy of the nanoparticles and the nanoparticles preserve their composition [ 43 , 58 ]. During energetic deposition, plastic deformation occurs when the energy per atom is close to the cohesive energy of the nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of hafnium nanoparticles and hafnium nanoparticle films by gas condensation and energetic deposition

Michelakaki¹,

Boukos²,

Dragatogiannis³

et al. 2018

Beilstein J. Nanotechnol.

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In this work we study the fabrication and characterization of hafnium nanoparticles and hafnium nanoparticle thin films. Hafnium nanoparticles were grown in vacuum by magnetron-sputtering inert-gas condensation. The as deposited nanoparticles have a hexagonal close-packed crystal structure, they possess truncated hexagonal biprism shape and are prone to surface oxidation when exposed to ambient air forming core–shell Hf/HfO2 structures. Hafnium nanoparticle thin films were formed through energetic nanoparticle deposition. This technique allows for the control of the energy of charged nanoparticles during vacuum deposition. The structural and nanomechanical properties of the nanoparticle thin films were investigated as a function of the kinetic energy of the nanoparticles. The results reveal that by proper adjustment of the nanoparticle energy, hexagonal close-packed porous nanoparticle thin films with good mechanical properties can be formed, without any additional treatment. It is shown that these films can be patterned on the substrate in sub-micrometer dimensions using conventional lithography while their porosity can be well controlled. The fabrication and experimental characterization of hafnium nanoparticles is reported for the first time in the literature.

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Collision of Clusters with Surfaces: Deposition, Surface Modification and Scattering

Cited by 22 publications

References 165 publications

Effect of elastic vibrations on normal head-on collisions of isothermal spheres

Effect of elastic vibrations on normal head-on collisions of isothermal spheres

Dynamics of cluster deposition on Ar surface

Synthesis of hafnium nanoparticles and hafnium nanoparticle films by gas condensation and energetic deposition

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