The Role of Phase Separation on Rayleigh-Plateau Type Instabilities in Alloys

Allaire, Ryan H.; Kondic, Lou; Cummings, L. J.; Rack, Philip D.; Fuentes‐Cabrera, Miguel

doi:10.1021/acs.jpcc.0c08720

Cited by 9 publications

(7 citation statements)

References 48 publications

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“…Figures 2(a) and (b) show phase plane plots of T peak and LL, respectively, for various values of substrate thickness H s and Biot numbers, Bi; see Eq. (9). A zero Biot number corresponds to a perfectly insulated substrate that loses no heat to the underlying Si slab, while Bi → ∞ corresponds to a poorly insulated substrate in contact with a Si slab at ambient temperature, T a (in Eq.…”

Section: B Flat Film Results -Influence Of Substrate Thickness Biot N...mentioning

confidence: 99%

“…A particular challenge involves modeling external effects that couple to the fluid dynamics of the film. Some examples include the influence of an electric field on film dynamics [3][4][5], the competition between chemical instabilities in multi-mixture liquids and their dewetting [6][7][8][9][10], or the effect of permeable underlying substrates [11,12]. Thermal effects have received significant attention as well, in particular regarding the temperature dependence of material properties, as discussed further below.…”

Section: Introductionmentioning

confidence: 99%

“…Figures 8,9, and 10 illustrate the role of H s on the dewetting process for Bi = 0.1 and Bi = 10 3 . Figure8(a) shows average film temperatures for Bi = 0.1 and H s = 10, 15, 20, and 25 where both film viscosity and substrate thermal conductivity are temperature-dependent, M = M(t) and k = k(T s ).…”

mentioning

confidence: 99%

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The influence of thermal effects on the breakup of thin films of nanometric thickness

Allaire¹,

Cummings²,

Kondic³

2021

Preprint

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We apply a previously developed asymptotic model (J. Fluid. Mech. 915, A133 (2021)) to study instabilities of free surface films of nanometric thickness on thermally conductive substrates in two and three spatial dimensions. While the specific focus is on metal films exposed to laser heating, the model itself applies to any setup involving films on the nanoscale whose material parameters are temperature-dependent. For the particular case of metal films heated from above, an important aspect is that the considered heating is volumetric, since the absorption length of the applied laser pulse is comparable to the film thickness. In such a setup, absorption of thermal energy and film evolution are closely correlated and must be considered self-consistently. The asymptotic model allows for a significant simplification, which is crucial from both modeling and computational points of view, since it allows for asymptotically correct averaging of the temperature over the film thickness. We find that the properties of the thermally conductive substrate -in particular its thickness and rate of heat loss -play a critical role in controlling the film temperature and dynamics. The film evolution is simulated using efficient GPU-based simulations which, when combined with the developed asymptotic model, allow for fully nonlinear time-dependent simulations in large threedimensional computational domains. In addition to uncovering the role of the substrate and its properties in determining the film evolution, one important finding is that, at least for the considered range of material parameters, strong in-plane thermal diffusion in the film results in negligible spatial variations of temperature, and the film evolution is predominantly influenced by temporal variation of film viscosity and surface tension (dictated by average film temperature), as well as thermal conductivity of the substrate.

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Section: B Flat Film Results -Influence Of Substrate Thickness Biot N...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of thermal effects on the breakup of thin films of nanometric thickness

Allaire¹,

Cummings²,

Kondic³

2021

Preprint

Self Cite

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“…Moreover, linear stability analysis predicts a preferred wavelength that will drive a liquid wire to breakup. Much work has been done in regards to nanocluster stability during solid-liquid coexistence 13 , and the stability of liquid nanojets 14,15 , nanocylinders 16 , and even in cylindrical metal alloys 17 , relatively few studies address the stability of the solid core of nanowires close to their melting point. It was found that for finite-sized cylinders during phase coexistence, differences in curvature and fluctuations would lead to the formation of random breaches at the material interface, causing the growth of instabilities which lead to the melting of the solid 18 .…”

Section: Introductionmentioning

confidence: 99%

Nanowire melting modes during the Solid-Liquid Phase Transition: Theory and Molecular Dynamics Simulations

Ridings

Hendy

2022

Preprint

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Molecular dynamics simulations have shown that after initial surface melting, nanowires can melt via two mechanisms: an interface front moves towards the wire centre; the growth of instabilities at the interface can cause the solid to pinch-off and breakup. By perturbing a capillary fluctuation model describing the interface kinetics, we show when each mechanism is preferred and compare the results to molecular dynamics simulation. A Plateau-Rayleigh-type of instability is found and suggests longer nanowires will melt via an instability mechanism, whereas in shorter nanowires the melting front will move closer to the centre before the solid pinch-off can initiate. Simulations support this theory; preferred modes that destabilise the interface are proportional to the wire length, with longer nanowires preferring to pinch-off and melt; shorter wires have a more stable interface close to their melting temperature, and prefer to melt via an interface front that moves towards the wire centre.

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“…Although the creation of crystalline phases driven by PR mechanism has been demonstrated, so far there are many open questions. Just few examples include the role of impurities on coupling formation and local atomic site configuration, 14 how these necklace structures are joined to form decorated architectures, [15][16][17] whether there is a full control over composition, diffusion paths, and/or structural modifications, [18][19][20] coexisting structural polytypes, 21,22 diffusion-driven effects, 23 phase separation problems, 24 radial or axial chemical modulations, 22 as well as atomic scale variability due to fluctuations in the growth rate. 4 Consequently, apart from a few cases in which single crystal X-ray diffraction measurements of nanowires could be recorded, [25][26][27] almost no information about the crystal symmetry of individual nanostructures and their integration into single architectures is available.…”

mentioning

confidence: 99%

Zn2GeO4/SnO2 nanowire architecture: A correlative spatially resolved X-ray study

Dolado¹,

Malato²,

Segura-Ruíz³

et al. 2022

Preprint

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Wide bandgap semiconductor heterostructures based on nanowires have attracted great interest as one of the nanoscale building blocks for the development of novel optoelectronic devices. Owing to the critical role of heterogeneities and structural imperfections in the optoelectronic properties, it has become a challenge to investigate in detail the local structure and elemental composition of these systems. Typically, transmission electron microscopy and energy dispersive X-ray spectroscopy are applied to address such issues. Here, using a synchrotron nanobeam probe, we show a correlative spatially-resolved study of the composition, luminescence and local structure of a Zn 2 GeO 4 /SnO 2 nanowire-based system. Unlike other works, the heterostructures were synthesized by an effective catalyst-free thermal evaporation method and present a skewer-shaped architecture formed by Plateau-Rayleigh instability. Our results high-1

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The Role of Phase Separation on Rayleigh-Plateau Type Instabilities in Alloys

Cited by 9 publications

References 48 publications

The influence of thermal effects on the breakup of thin films of nanometric thickness

The influence of thermal effects on the breakup of thin films of nanometric thickness

Nanowire melting modes during the Solid-Liquid Phase Transition: Theory and Molecular Dynamics Simulations

Zn2GeO4/SnO2 nanowire architecture: A correlative spatially resolved X-ray study

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