scholarly journals Size‐Dependence of the Melting Temperature of Individual Au Nanoparticles

2019 ◽  
Vol 36 (3) ◽  
pp. 1800480 ◽  
Author(s):  
Philomena Schlexer ◽  
Anton Bay Andersen ◽  
Bela Sebok ◽  
Ib Chorkendorff ◽  
Jakob Schiøtz ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Size Dependence ◽  
Au Nanoparticles

Molecular dynamics simulations of the alloying process of Cu/Au nanoparticles with different sizes

2020 ◽  
pp. 2150005
Author(s):  
Shouqi Cao ◽  
Haochen Zuo ◽  
He Xin ◽  
Lixin Zhou
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Melting Temperature ◽  
Industrial Production ◽  
Au Nanoparticles ◽  
Coalescence Process ◽  
Three Stages ◽  
Dynamics Simulations ◽  
Outer Area ◽  
Sintering Neck

The coalescence of particles extensively exists in the industrial production and nature, which is of great research significance. This paper examined the alloying process of Cu/Au nanoparticles with different sizes by molecular dynamics (MDs) simulations. The coalescence process presents three stages which can be divided by the contact and fusion. The alloying processes of Cu/Au nanoparticles with different sizes had contacted with each other before the heating at 300 K. The Au atoms diffused through the outer area of the sintering neck before the nanoparticles were fused into one particle. The coalescence had become severe after the systems reached the melting temperature. The different systems showed different sintering rate.

Thermal stability of marks gold nanoparticles: A molecular dynamics simulation

2017 ◽  
Vol 31 (07) ◽  
pp. 1741001
Author(s):  
Yanlin Jia ◽  
Siqi Li ◽  
Weihong Qi ◽  
Mingpu Wang ◽  
Zhou Li ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Thermal Stability ◽  
Melting Temperature ◽  
Cohesive Energy ◽  
Au Nanoparticles ◽  
Mean Square Displacement ◽  
Dynamics Simulation ◽  
Structure Variation ◽  
Deformation Parameters ◽  
Thermal Stability Of

Molecular dynamics (MDs) simulations were used to explore the thermal stability of Au nanoparticles (NPs) with decahedral, cuboctahedral, icosahedral and Marks NPs. According to the calculated cohesive energy and melting temperature, the Marks NPs have a higher cohesive energy and melting temperature compared to these other shapes. The Lindemann index, radial distribution function, deformation parameters, mean square displacement and self-diffusivity have been used to characterize the structure variation during heating. This work may inspire researchers to prepare Marks NPs and apply them in different fields.

Size-dependence of plasmonic Au nanoparticles in photocatalytic behavior of Au/TiO 2 and Au@SiO 2 /TiO 2

2015 ◽  
Vol 499 ◽  
pp. 47-54 ◽  
Author(s):  
Seon Mi Yoo ◽  
Sher Bahadur Rawal ◽  
Ji Eun Lee ◽  
Jeongho Kim ◽  
Han-Youl Ryu ◽  
...  
Keyword(s):  
Size Dependence ◽  
Au Nanoparticles

Origin of the size dependence of Au nanoparticles toward molecular oxygen dissociation

2010 ◽  
Vol 128 (4-6) ◽  
pp. 675-681 ◽  
Author(s):  
Alberto Roldán ◽  
Josep M. Ricart ◽  
Francesc Illas
Keyword(s):  
Molecular Oxygen ◽  
Size Dependence ◽  
Au Nanoparticles ◽  
Oxygen Dissociation

Thermodynamic model of crystallization and melting of small particles

Open Physics ◽  
2004 ◽  
Vol 2 (1) ◽  
Author(s):  
Vladimir Samsonov ◽  
Oleg Malkov
Keyword(s):  
Melting Temperature ◽  
Thermodynamic Model ◽  
Size Dependence ◽  
Nonequilibrium Thermodynamics ◽  
Spherical Particles ◽  
Small Particles ◽  
Crystal Nucleus

AbstractThe size dependence of the nanocrystal melting temperature has been investigated based on a nonequilibrium thermodynamics approach. An expression has been derived for the melting temperature that, contrary to the classical Tomson formula, takes into account the metastable character of the crystal nucleus-melt shell equilibrium. Quantitative estimations have been carried out for small spherical particles of aluminum, tin, and lead.

Thermal coarsening of nanoporous gold: Melting or recrystallization

2009 ◽  
Vol 24 (2) ◽  
pp. 301-304 ◽  
Author(s):  
Masataka Hakamada ◽  
Mamoru Mabuchi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Melting Temperature ◽  
Thermal Instability ◽  
Au Nanoparticles ◽  
Nanoporous Gold ◽  
Scanning Calorimetry ◽  
State Process ◽  
Thermal Coarsening

The thermal coarsening of nanoporous Au was examined and compared with the thermal instability of Au nanoparticles. The nanoporous Au was coarsened at temperatures far below the melting temperature of Au nanoparticles, which possess sizes similar to the nanoligaments. Differential scanning calorimetry characterization of nanoporous Au exhibited an exothermal peak around 470 K. These results suggest that solid-state process like recrystallization, rather than melting, is responsible for the thermal coarsening of nanoporous Au.

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