Thermodynamic modeling of Ag – Cu nanoalloy phase diagram

Jabbareh, Mohammad Amin; Monji, Fatemeh

doi:10.1016/j.calphad.2018.01.004

Cited by 38 publications

(25 citation statements)

References 42 publications

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“…Inspection of Figure 9b does not make it possible to experimentally distinguish the distribution of Ag and Cu, except for the fact that they are both located in the metallic part of the NPs. By taking into account the immiscible nature of Ag and Cu [147], one could expect a the segregation of these two elements instead of an alloyed core. MD simulations reveals that the NP structure is characterized by a partial Ag core surrounded by phase-segregated Cu at the interface with MGO [146], a chemical ordering opposed to the typical Cu core Ag shell arrangement for AgCu NPs in the gas phase [148][149][150].…”

Section: Gas Phase Depositionmentioning

confidence: 99%

Antimicrobial Nanostructured Coatings: A Gas Phase Deposition and Magnetron Sputtering Perspective

et al. 2020

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Counteracting the spreading of multi-drug-resistant pathogens, taking place through surface-mediated cross-contamination, is amongst the higher priorities in public health policies. For these reason an appropriate design of antimicrobial nanostructured coatings may allow to exploit different antimicrobial mechanisms pathways, to be specifically activated by tailoring the coatings composition and morphology. Furthermore, their mechanical properties are of the utmost importance in view of the antimicrobial surface durability. Indeed, the coating properties might be tuned differently according to the specific synthesis method. The present review focuses on nanoparticle based bactericidal coatings obtained via magneton-spattering and supersonic cluster beam deposition. The bacteria–NP interaction mechanisms are first reviewed, thus making clear the requirements that a nanoparticle-based film should meet in order to serve as a bactericidal coating. Paradigmatic examples of coatings, obtained by magnetron sputtering and supersonic cluster beam deposition, are discussed. The emphasis is on widening the bactericidal spectrum so as to be effective both against gram-positive and gram-negative bacteria, while ensuring a good adhesion to a variety of substrates and mechanical durability. It is discussed how this goal may be achieved combining different elements into the coating.

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Section: Gas Phase Depositionmentioning

confidence: 99%

Antimicrobial Nanostructured Coatings: A Gas Phase Deposition and Magnetron Sputtering Perspective

et al. 2020

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“…The high melting point of Cu (1085 °C) probably hinders the shrinking of the patterned Cu film at 850 °C (Figure S1, Supporting Information). Binary Cu‐metal phase diagrams indicate that CuAg alloy (with 71.9 wt% Ag) possesses a low melting temperature of 779 °C, [ 34 ] which suggests that alloying with Ag may facilitate the dewetting of Cu film. Moreover, as the vapor pressure of Ag is much higher than that of Cu, Ag may be removed by appropriate thermal evaporation.…”

Section: Resultsmentioning

confidence: 99%

In Situ Assembly of Ordered Hierarchical CuO Microhemisphere Nanowire Arrays for High‐Performance Bifunctional Sensing Applications

et al. 2021

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Seeking a facile approach to directly assemble bridged metal oxide nanowires on substrates with predefined electrodes without the need for complex postsynthesis alignment and/or device procedures will bridge the gap between fundamental research and practical applications for diverse biochemical sensing, electronic, optoelectronic, and energy storage devices. Herein, regularly bridged CuO microhemisphere nanowire arrays (RB‐MNAs) are rationally designed on indium tin oxide electrodes via thermal oxidation of ordered Cu microhemisphere arrays obtained by solid‐state dewetting of patterned Ag/Cu/Ag films. Both the position and spacing of CuO microhemisphere nanowires can be well controlled by as‐used shadow mask and the thickness of Cu film, which allows homogeneous manipulation of the bridging of adjacent nanowires grown from neighboring CuO hemispheres, and thus benefits highly sensitive trimethylamine (TMA) sensors and broad band (UV–visible to infrared) photodetectors. The electrical response of 3.62 toward 100 ppm TMA is comparable to that of state‐of‐the‐art CuO‐based sensors. Together with the feasibility of in situ assembly of RB‐MNAs device arrays via common lithographic technologies, this work promises commercial device applications of CuO nanowires.

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Section: Introductionunclassified

“…В случае фазового перехода " твердое тело−жидкость" в наноразмерных системах данные особенности проявляются как зависимость характерных температур фазовых переходов (ликвидуса, солидуса), состава и объема сосуществующих жидкой и твердой фаз от размера системы [9,21,[24][25][26][27][28], ее формы [27,28] и ряда других факторов [29,30]. Уменьшение объема наночастицы приводит к изменению положения точек ликвидуса и солидуса [9,21,[24][25][26][27][28]30], а также сужению температурного интервала, соответствующего гетерогенному состоянию [26,30]. В [30] показано, что температуры ликвидуса и солидуса, равновесные составы и объемы твердой и жидкой фаз также зависят и от исходного состава частицы, и фазовые равновесия в наносистемах различного исходного состава не могут быть описаны единой фазовой диаграммой (при более ранних оценках [11,21,[24][25][26][27][28] данный эффект не был рассмотрен, а оценки влияния формы [27,28] и ряд других включали рассмотрение лишь наночастиц в форме простых платоновых и архимедовых тел).…”

Section: Introductionunclassified

“…Уменьшение объема наночастицы приводит к изменению положения точек ликвидуса и солидуса [9,21,[24][25][26][27][28]30], а также сужению температурного интервала, соответствующего гетерогенному состоянию [26,30]. В [30] показано, что температуры ликвидуса и солидуса, равновесные составы и объемы твердой и жидкой фаз также зависят и от исходного состава частицы, и фазовые равновесия в наносистемах различного исходного состава не могут быть описаны единой фазовой диаграммой (при более ранних оценках [11,21,[24][25][26][27][28] данный эффект не был рассмотрен, а оценки влияния формы [27,28] и ряд других включали рассмотрение лишь наночастиц в форме простых платоновых и архимедовых тел). При анализе зависимости фазовых равновесий от формы наночастицы при плавлении представляется удобным адаптировать подходы, предложенные в [6,31,32] для частиц с фазовыми превращениями в твердом состоянии, где для задания формы использовались различные варианты безразмерных параметров [31][32][33][34] или методы фрактальной геометрии, позволяющие описывать широкий спектр реальных частиц сложной нерегулярной формы [6,32,34].…”

Section: Introductionunclassified

See 1 more Smart Citation

К вопросу о плавлении наночастиц фрактальной формы (на примере системы Si-Ge)

Шишулин¹,

Федосеев²,

Шишулина³

2019

Журнал Технической Физики

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In this paper, thermodynamical approach has been used to simulate the influence of shape on phase equilibria in the two-phase-region between liquidus and solidus temperatures in case of Si-Ge alloy nanoparticles. Volumes and shapes of considered nanoparticles have been described by their effective radii and fractal dimensions, the dependence of fractal dimensions on temperature has been obtained using a simple geometrical model. It has been shown that decreasing the volume of a nanoparticle and its fractal dimension (which corresponds to nanoparticles of a more complicated shape) leads to narrowing down the temperature range of the heterogeneous region and changes the phase transition temperatures and equilibrium compositions of co-existing phases. At different temperatures, the dependences of the composition of the liquid phase differ which is explained by implementing different mechanisms of reducing the surface energy.

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Thermodynamic modeling of Ag – Cu nanoalloy phase diagram

Cited by 38 publications

References 42 publications

Antimicrobial Nanostructured Coatings: A Gas Phase Deposition and Magnetron Sputtering Perspective

Antimicrobial Nanostructured Coatings: A Gas Phase Deposition and Magnetron Sputtering Perspective

In Situ Assembly of Ordered Hierarchical CuO Microhemisphere Nanowire Arrays for High‐Performance Bifunctional Sensing Applications

К вопросу о плавлении наночастиц фрактальной формы (на примере системы Si-Ge)

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