Special aspects of the thermodynamics of formation and polarisation of Ag/Si nanoparticles

Nomoev, A. V.; Torhov, N A; Khartaeva, E. Ch.; Сызранцев, В. В.; Yumozhapova, N. V.; А., Цыренова М.; Mankhirov, V

doi:10.1016/j.cplett.2019.02.015

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…The example of the Si-Ag system, characterized by the presence of an eutectic around 1118 K and 89 at.% Ag, is very illustrative. Nomoev et al [44] showed that during the crystallisation of the nanoparticle core, eutectics consisting of silver and silicon layers are formed. The cooling rate determines not only the formation of either layered or globular eutectic compounds but also the size of the eutectic plates.…”

Section: Freezing All 421 the Role Of Solidificationmentioning

confidence: 99%

Alloying nanoparticles by discharges in liquids: a quest for metastability

Nominé¹,

Tarasenka²,

Nevar³

et al. 2021

Plasma Phys. Control. Fusion

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Resorting to ultrafast processes to synthesize alloy nanoparticles far from thermodynamic equilibrium is subjected to phase transformations that keep particles at a given temperature for periods of time that are usually long with respect to the process pulse durations. Then, reaching non-equilibrium conditions is not straightforwardly associated with the process, as fast as it can be, but rather to heat transfer mechanisms during phase transformations. This latter aspect is dependent on nanoparticle size. Furthermore, other important phenomena, like chemical ordering, are essential to explain the final structure adopted by an alloy nanoparticle. In this work, a specific attention is paid to suspensions submitted either to electrical discharges or to ultrashort laser excitations. After discussing thermodynamic considerations that give the frame beyond which non-equilibrium alloys form, a description of the heating processes at stake is provided. This leads to maximum temperature reached for particles with nanometric sizes and specific conditions to fulfil practically during the quenching step. The way solidification must be processed in that purpose is discussed next. The example of the Cu-Ag system is finally considered to illustrate the advantage of better controlling processes that are currently used to create homogeneously-alloyed nanoparticles made of immiscible elements, but also to show the actual limitations of these approaches.

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Section: Freezing All 421 the Role Of Solidificationmentioning

confidence: 99%

Alloying nanoparticles by discharges in liquids: a quest for metastability

Nominé¹,

Tarasenka²,

Nevar³

et al. 2021

Plasma Phys. Control. Fusion

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“…Various metals, including copper and zinc, were obtained. Also, composite nanoparticles, for example, TaSi2/Si and Ag/Si, were created by irradiating with electrons simultaneously two separate substances that make up the particle [6,7]. However, the authors failed to obtain metal-metal composite particles.…”

Section: Introductionmentioning

confidence: 99%

Nanopowders Created by Irradiating Brass with Relativistic Electrons

Khartaeva

Бардаханов

Nomoev

et al. 2023

MSF

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The paper deals with changes in the stoichiometry of nanopowders obtained under staged irradiation of a brass ingot placed in a graphite crucible. Composite core-shell CuO/ZnO nanoparticles, copper nanoparticles, and copper and zinc oxides were obtained. The use of a relativistic electron accelerator is necessary to produce nanopowders on an industrial scale. Transmission electron microscopy and energy-dispersive analysis of the obtained nanoparticles were carried out. Thermodynamic calculation of the temperature dependence of the equilibrium content of copper and zinc is presented for the condensed and gas phases. The formation mechanism of CuO/ZnO composite nanoparticles is discussed.

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“…The structure of these nanoparticles is primarily determined by the methods and conditions of synthesis, which should allow us to combine the two materials even if they are immiscible in the bulk state. In addition to chemical techniques [9][10][11][12], physical methods such as gas-phase methods [5,6,15], laser ablation [7,8,16], and magnetron-sputter gas-phase condensation [17] have been developed. When these methods are combined with the possibility of rapid heating and evaporation of both materials and the possibility of rapid controlled cooling of the resulting vapour mixture, the formation of nanoparticles with a complex structure is possible.…”

Section: Introductionmentioning

confidence: 99%

Formation of metal/semiconductor Cu–Si composite nanostructures

Yumozhapova

Nomoev

Сызранцев

et al. 2019

Beilstein J. Nanotechnol.

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Molecular dynamics modelling of the formation of copper and silicon composite nanostructures was carried out by using the many-particle potential method. The dependences of the internal structure on the cooling rate and the ratio of elements were investigated. The possibility of the formation of the Cu–Si nanoparticles from both a homogeneous alloy and two initial drops at short distance were shown. A comparative analysis showed that the diameter distribution of copper and silicon atoms in experimental particles coincides with the simulation results with silicon content of 50 atom %. Additionally, an estimation of the effective experimental cooling rate was made.

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Special aspects of the thermodynamics of formation and polarisation of Ag/Si nanoparticles

Cited by 7 publications

References 19 publications

Alloying nanoparticles by discharges in liquids: a quest for metastability

Alloying nanoparticles by discharges in liquids: a quest for metastability

Nanopowders Created by Irradiating Brass with Relativistic Electrons

Formation of metal/semiconductor Cu–Si composite nanostructures

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