Structural transformations in nano- and microobjects triggered by disclinations

Романов, А. Е.; Vikarchuk, A. A.; Kolesnikova, A. L.; Dorogin, Leonid; Kink, Ilmar; Aifantis, Elias C.

doi:10.1557/jmr.2011.372

Cited by 15 publications

(10 citation statements)

References 22 publications

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“…One different relaxation mechanism merits mention here, as it may be quite general at least for thermodynamic shapes. As analyzed independently by Ajayan et al [118,289,290] and Romanov et al [4,[256][257][258][259][260][261][263][264][265], the strain energy of a decahedron approximated as a cylinder when the dislocation is not in the center by a fractional distance b scales as…”

Section: Stress Relief Mechanismsmentioning

confidence: 98%

“…Apparently unaware of this work, de Wit pointed out that the Dh was an example of a disclination [255] which was approximately extended to three dimensions by Yoffe (described in [64]) for an Ic. More complex analytical solutions have also been given by the group of Romanov and co-workers [4,[256][257][258][259][260][261][262][263][264][265] and numer ical solutions using finite element methods have also appeared [266][267][268], as well as comparable inhomogeneous strains in larger scale molecular dynamics calculations [269] and earlier atomistic papers [59].…”

Section: General Character Of the Strain In Mtpsmentioning

confidence: 99%

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Nanoparticle shape, thermodynamics and kinetics

Marks

Peng

2016

J. Phys.: Condens. Matter

245

274

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Nanoparticles can be beautiful, as in stained glass windows, or they can be ugly as in wear and corrosion debris from implants. We estimate that there will be about 70,000 papers in 2015 with nanoparticles as a keyword, but only one in thirteen uses the nanoparticle shape as an additional keyword and research focus, and only one in two hundred has thermodynamics. Methods for synthesizing nanoparticles have exploded over the last decade, but our understanding of how and why they take their forms has not progressed as fast. This topical review attempts to take a critical snapshot of the current understanding, focusing more on methods to predict than a purely synthetic or descriptive approach. We look at models and themes which are largely independent of the exact synthetic method whether it is deposition, gas-phase condensation, solution based or hydrothermal synthesis. Elements are old dating back to the beginning of the 20th century-some of the pioneering models developed then are still relevant today. Others are newer, a merging of older concepts such as kinetic-Wulff constructions with methods to understand minimum energy shapes for particles with twins. Overall we find that while there are still many unknowns, the broad framework of understanding and predicting the structure of nanoparticles via diverse Wulff constructions, either thermodynamic, local minima or kinetic has been exceedingly successful. However, the field is still developing and there remain many unknowns and new avenues for research, a few of these being suggested towards the end of the review.

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Section: Stress Relief Mechanismsmentioning

confidence: 98%

Section: General Character Of the Strain In Mtpsmentioning

confidence: 99%

Nanoparticle shape, thermodynamics and kinetics

Marks

Peng

2016

J. Phys.: Condens. Matter

245

274

View full text Add to dashboard Cite

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“…The experimental images of disclinated micro-and nanowires can be found, for example, in refs. [36,39,48,50].…”

Section: Introductionmentioning

confidence: 99%

Wedge disclination dipole in an embedded nanowire within the surface/interface elasticity

Shodja¹,

Rezazadeh-Kalehbasti

Gutkin

2013

Journal of the Mechanical Behavior of Materials

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The elastic behavior of an arbitrary oriented wedge disclination dipole located inside a nanowire, which in turn is embedded in an infinite matrix, is studied within the surface/interface theory of elasticity. The corresponding boundary value problem is provided using complex potential functions. The potential functions are defined through modeling the wedge disclination in terms of an equivalent distribution of edge dislocations. The interface effects on the stress field and strain energy of the disclination dipole and image forces acting on it, the influence of relative shear moduli of the nanowire and the matrix, as well as the different characteristics of the interface are studied thoroughly. It is shown that the positive interface modulus leads to increased strain energy and extra repulsive forces on the disclination dipole. The noticeable effect of the negative interface modulus is the non-classical oscillations in the stress field of the disclination dipole and an extra attractive image force on it.

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“…When the size is bigger, e.g. tens of nanometers, the high stresses can be relaxed through different channels [107][108][109][110], such as the formation of dislocations or a hollow centeral region. As we just discussed above, each FCC lattice corresponds to a tetrahedron.…”

Section: Microstructure Of the Top Surface Layermentioning

confidence: 99%

“…Formation of five-fold twinning structure: (a) micro(nano)-rods with five-fold symmetry adopted from Ref [110],. (b) nano-structure of five-fold symmetry obtained in our simulations 96.…”

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confidence: 99%

Computational investigation of short pulse laser-induced modification of surface microstructure and photoacoustic control of surface diffusion

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Rapid progress in the development of accessible sources of short (pico-and femtosecond) laser pulses opens up new opportunities for surface modification with high accuracy and spatial resolution. In particular, the shallow depth of the heat-affected zone in short-pulse laser processing of strongly absorbing materials can result in the confinement of the laser-induced structural modifications within a surface layer as small as tens of nanometers. The small size of

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Structural transformations in nano- and microobjects triggered by disclinations

Abstract: Abstract

Cited by 15 publications

References 22 publications

Nanoparticle shape, thermodynamics and kinetics

Nanoparticle shape, thermodynamics and kinetics

Wedge disclination dipole in an embedded nanowire within the surface/interface elasticity

Computational investigation of short pulse laser-induced modification of surface microstructure and photoacoustic control of surface diffusion

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