Optically Monitored Melting, Supercooling and Solidification of Lead Aggregates Embedded in a Dielectric Matrix

Garrigos, R.; Kofman, R.; Cheyssac, P.; Perrin, Mathieu

doi:10.1209/0295-5075/1/7/004

Cited by 27 publications

(18 citation statements)

References 13 publications

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“…In order to investigate the size dependence of the melting temperatures of nanocrystals, many experimental techniques have been used, namely differential thermal analysis and differential scanning calorimetry (Dick et al, 2002;Sheng et al, 1997;Lavc ˇevic ´& Ogorelec, 2003;Jo et al, 2011), optical reflection and transmission (Garrigos et al, 1986;Haro-Poniatowski et al, 2005), transmission electron microscopy (Xu et al, 2007;Goldstein et al, 1992), and X-ray diffraction (Wang & Zhu, 2015;Freitas et al, 2006). Although these techniques generally provide useful results, they may in some cases be subject to severe drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Determination of the melting temperature of spherical nanoparticles in dilute solution as a function of their radius by exclusively using the small-angle X-ray scattering technique

Kellermann¹,

Pereira²,

Craievich³

2020

J Appl Cryst

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In this investigation the dependence on radius of the melting temperature of dilute sets of spherical nanocrystals with wide radius distributions was determined by a novel procedure exclusively using the results of small‐angle X‐ray scattering (SAXS) measurements. This procedure is based on the sensitivity of the SAXS function to small and rather sharp variations in the size and electron density of nanocrystals at their melting temperature. The input for this procedure is a set of experimental SAXS intensity functions at selected q values for varying sample temperatures. In practice, the sample is heated from a minimum temperature, lower than the melting temperature of the smallest nanocrystals, up to a temperature higher than the melting temperature of the largest nanocrystals. The SAXS intensity is recorded in situ at different temperatures during the heating process. This novel procedure was applied to three samples composed of dilute sets of spherical Bi nanocrystals with wide radius distributions embedded in a sodium borate glass. The function relating the melting temperature of Bi nanocrystals with their radius – determined by using the procedure proposed here – agrees very well with the results reported in previous experimental studies using different methods. The results reported here also evidence the predicted size‐dependent contraction of Bi nanocrystals induced by the large surface‐to‐volume ratio of small nanocrystals and an additional size‐independent compressive stress caused by the solid glass matrix in which liquid Bi nanodroplets are initially formed. This last effect is a consequence of the increase in the volume of Bi nanoparticles upon crystallization and also of differences in the thermal expansion coefficients of the crystalline phase of Bi and the glass matrix. This additional stress leads to a depression of about 10 K in the melting temperature of the Bi nanocrystals confined in the glass. The procedure described here also allowed the determination of the specific masses and thermal expansion coefficients of Bi nanoparticles in both liquid and crystalline phases.

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Section: Introductionmentioning

confidence: 99%

Determination of the melting temperature of spherical nanoparticles in dilute solution as a function of their radius by exclusively using the small-angle X-ray scattering technique

Kellermann¹,

Pereira²,

Craievich³

2020

J Appl Cryst

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“…Studies performed on Pb aggregates in SiO demonstrated that instead of superheating, the T m was reduced relative to the bulk. 11 While the superheating of lead crystallites on a carbon surface will depend on both size and shape. 12 Our recent results for the ''as-quenched'' and ''as-milled'' samples of Pb particles embedded in Al matrix also indicate that in order to achieve superheating, coherent or semicoherent interface must be formed.…”

Section: Introductionmentioning

confidence: 99%

Melting of Pb clusters without free surfaces

Jin

Sheng

1999

Phys. Rev. B

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“…This effect has been previously observed not only for Bi nanostructures, [27] but also for other metal nanostructures (e.g., Pb, Sn, Cd, In, and Tl). [53,54] This deviation of the cooling curve marks the temperature regime in which the Bi nanostructures are in the so-called supercooled state, without being able to initiate solidification, despite being below the nominal solidification temperature. The underlying reason for this phenomenon is the high energy barrier for the nucleation of the solid phase inside the liquid phase due to the need of formation of a solid-liquid interface.…”

Section: Understanding Switching Dynamics In Bi Metasurfaces: Tuning the On-statementioning

confidence: 99%

Nanosecond Laser Switching of Phase‐Change Random Metasurfaces with Tunable ON‐State

Alvarez-Alegria

Siegel

Garcia-Pardo

et al. 2021

Advanced Optical Materials

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that differ strongly from those of the constituent materials. Due to this remarkable flexibility, thin-film nanocomposites belong per se to the class of metasurfaces, whose fields of applications are constantly growing in key technological areas, including communications, energy, catalysis, and medicine. In the field of nanophotonics, the use of metasurfaces formed by planar arrangements of metallic and dielectric nanostructures has enabled the control of light at subwavelength scales, allowing light manipulation and processing in ways that are impossible to achieve with natural materials. [1][2][3][4] In particular, plasmonic metasurfaces based on nanostructured noble metals, either embedded in a dielectric film or deposited on top of a substrate, have shown extraordinary capabilities to strongly absorb, scatter, or confine incident light. More recently, nanostructures formed by high-index dielectric materials (mainly semiconductors such as Si and Ge) have gained momentum due to the particularities of their resulting electric and magnetic Mie resonances and have opened the field of the so-called Mie-resonant metaphotonics (also termed as Mie-tronics). [3,5,6] A relevant outcome of the improved understanding of these resonant phenomena has been acknowledged that there are alternative materials to the noble metals or conventional semiconductors that show plasmonic and Mie resonances, and, furthermore, that are better suited to address some specific nanophotonics applications. Among them are materials that offer plasmonic response in the ultraviolet, can withstand resonances at high temperature, or can be activated upon external excitation. [7][8][9][10] Bismuth (Bi) is one of such alternative materials and stands out due to its particular electronic structure, and optical and thermoelectronic properties. [11][12][13][14] Only very recently it has been shown that its electronic band structure displays giant interband electronic transitions in the mid-infrared, which, in turn, endows the dielectric function ε with a unique property that enables Bi-based nanostructures to show a dual behavior, enabling both plasmonic-like resonances in the ultraviolet and visible regions of the spectrum, and high-refractive-index Mie resonances in the near-and mid-infrared regions of the spectrum. [15,16] So far, metasurfaces based on Bi nanostructures have found applications in integrated photonic devices as perfect Random metasurfaces based on disordered phase-change nanostructures with broadband ultraviolet-visible plasmonic properties are fantastic platforms for the development of active photonic components due to their versatility. Here optical ON-OFF switching upon nanosecond laser irradiation of Bi-based random metasurfaces is demonstrated profiting from the solid-liquid phase transition of the Bi nanostructures. The fast switching time is revealed by using single-pulse real-time reflectivity measurements with sub-nanosecond temporal resolution. A sudden reflectivity decrease is observed upon laser excitation, triggered by hea...

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Optically Monitored Melting, Supercooling and Solidification of Lead Aggregates Embedded in a Dielectric Matrix

Abstract: The solid ⇌ liquid transitions of lead aggregates embedded in a silicon matrix are investigated through optical measurements. A phenomenological model linking optics and thermodynamics of melting is proposed.

Cited by 27 publications

References 13 publications

Determination of the melting temperature of spherical nanoparticles in dilute solution as a function of their radius by exclusively using the small-angle X-ray scattering technique

Determination of the melting temperature of spherical nanoparticles in dilute solution as a function of their radius by exclusively using the small-angle X-ray scattering technique

Melting of Pb clusters without free surfaces

Nanosecond Laser Switching of Phase‐Change Random Metasurfaces with Tunable ON‐State

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