Hardness and Elastic Modulus on Six-Fold Symmetry  Gold Nanoparticles

Ramos, Manuel; Ortiz-Jordan, Luis; Hurtado-Macías, Abel; Flores, S.; Galindo, José Trinidad Elizalde; Rocha, Carmen R.; Torres, Brenda; Zarei-Chaleshtori, Maryam; Chianelli, Russell R.

doi:10.3390/ma6010198

Cited by 37 publications

(13 citation statements)

References 19 publications

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“…While the central stress localization observed in MD might be overstated by the blunting process symmetries, we believe that more off-centre or sub-surface homogeneous nucleation events might happen in experimental samples as e.g. γ' precipitates [24,25], Au [19,55] and Ag [56] NPs as well as Si NCs [33] which are known to exhibit rounded corners and vertices. In this context, supplementary experimental investigations are required to verify the emergence of homogeneous nucleation events during the compression of blunt nano-objects.…”

Section: Stress Concentration and Dislocation Nucleationmentioning

confidence: 86%

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Amodeo

Lizoul

2017

Materials & Design

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The deformation of blunt nanocrystals under uniaxial compression is modelled using molecular dynamics simulations. Ni3Al blunt nanoparticles are built using a simple algorithm that allows continuous shape design from perfectly-sharp nanocubes to nanospheres including a large set of cuboid shapes. Simulation results show that blunt nanoparticles are significantly stronger in comparison to their perfectly cubic counterparts and deform due to the nucleation of partial dislocations and deformation twins. Furthermore, while the early plastic deformation of nano-objects is generally attributed to the nucleation of dislocations from the surface, here we show that homogeneous dislocation nucleation may also happen in blunt nanoparticles and a size-dependent transition parameter is defined. This study emphasizes how much the design of virtual samples is crucial when modelling nano-objects mechanical properties using molecular dynamics simulations and provides new insights onto potential incipient plasticity features at the nanoscale.

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Section: Stress Concentration and Dislocation Nucleationmentioning

confidence: 86%

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Amodeo

Lizoul

2017

Materials & Design

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“…These particles have an elastic modulus ranging between 1–10 kPa and are known to be highly deformable under external stimuli such as pH, temperature, and osmotic pressure 21–23 . The diffusion coefficient of these NPs in agarose gels was compared to that of hard NPs (elastic moduli in the GPa range) made of polystyrene 24 (PS) or gold 25 (Au) of similar hydrodynamic radius.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous shrinking of soft nanoparticles boosts their diffusion in confined media

et al. 2019

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Improving nanoparticles (NPs) transport across biological barriers is a significant challenge that could be addressed through understanding NPs diffusion in dense and confined media. Here, we report the ability of soft NPs to shrink in confined environments, therefore boosting their diffusion compared to hard, non-deformable particles. We demonstrate this behavior by embedding microgel NPs in agarose gels. The origin of the shrinking appears to be related to the overlap of the electrostatic double layers (EDL) surrounding the NPs and the agarose fibres. Indeed, it is shown that screening the EDL interactions, by increasing the ionic strength of the medium, prevents the soft particle shrinkage. The shrunken NPs diffuse up to 2 orders of magnitude faster in agarose gel than their hard NP counterparts. These findings provide valuable insights on the role of long range interactions on soft NPs dynamics in crowded environments, and help rationalize the design of more efficient NP-based transport systems.

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“…The mechanical properties of the fabricated nanocomposite are predicted by micromechanical modeling using a RVE cube. The material behavior of Au is assumed as a linear elastic behavior with the tensile modulus of 100 GPa [ 45 ], Poisson’s ratio of 0.42 [ 46 ], and density of 19,320 kg/m 3 [ 47 ]. Since elastic behavior is studied in this work, only elastic properties are considered for the PVDF phase.…”

Section: Methodsmentioning

confidence: 99%

Laser Ablation-Assisted Synthesis of Poly (Vinylidene Fluoride)/Au Nanocomposites: Crystalline Phase and Micromechanical Finite Element Analysis

et al. 2020

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In this research, piezoelectric polymer nanocomposite films were produced through solution mixing of laser-synthesized Au nanoparticles in poly (vinylidene fluoride) (PVDF) matrix. Synthetization of Au nanoparticles was carried out by laser ablation in N-methyle-2-pyrrolidene (NMP), and then it was added to PVDF: NMP solution with three different concentrations. Fourier transformed infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were carried out in order to study the crystalline structure of the nanocomposite films. Results revealed that a remakable change in crystalline polymorph of PVDF has occurred by embedding Au nanoparticles into the polymer matrix. The polar phase fraction was greatly improved by increasing the loading content of Au nanoparticle. Thermogravimetric analysis (TGA) showed that the nanocomposite films are more resistant to high temperature and thermal degradation. An increment in dielectric constant was noticed by increasing the concentration of Au nanoparticles through capacitance, inductance, and resistance (LCR) measurement. Moreover, the mechanical properties of nanocomposites were numerically anticipated by a finite element based micromechanical model. The results reveal an enhancement in both tensile and shear moduli.

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Hardness and Elastic Modulus on Six-Fold Symmetry Gold Nanoparticles

Cited by 37 publications

References 19 publications

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Mechanical properties and dislocation nucleation in nanocrystals with blunt edges

Spontaneous shrinking of soft nanoparticles boosts their diffusion in confined media

Laser Ablation-Assisted Synthesis of Poly (Vinylidene Fluoride)/Au Nanocomposites: Crystalline Phase and Micromechanical Finite Element Analysis

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