Size- and shape-dependent melting enthalpy and entropy of nanoparticles

Fu, Qingshan; Zhu, Jiang; Xue, Yongqiang

doi:10.1007/s10853-016-0480-9

Cited by 39 publications

(19 citation statements)

References 40 publications

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“…XRD data of InNCs did not show any characteristic Bragg peaks because of the room temperature melting phenomenon, which implies that the prepared InNCs consist of molten In droplets (Figure c). This observation also agrees well with previous studies that melting of In nanoparticle happens near room temperature if its diameter is below 10 nm . Comparison of the UV–vis absorption spectra of InNCs, NaYbF 4 :Tm nanoparticles, and NaYbF 4 :Tm@SiO 2 @In nanocomposites in Figure d, indicates that InNCs and NaYbF 4 :Tm@SiO 2 @In nanocomposites have strong absorption at 265 and 270 nm, respectively, which suggests the presence of InNCs in the nanocomposites.…”

Section: Resultssupporting

confidence: 92%

Plasmon‐Enhanced Blue Upconversion Luminescence by Indium Nanocrystals

Wang

Guo

et al. 2019

Adv Funct Materials

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Numerous endeavors have been undertaken to gain enhanced upconversion luminescence via surface plasmon resonance (SPR) generated by specially designed nanostructures of noble metals (e.g., Au, Ag). However, the SPR response of these metals is usually weak in the ultraviolet (UV) region because of their intrinsic electronic configurations; thus, only green and red upconversion emissions can undergo significant plasmonic enhancement yet without selectivity, while an efficient approach to selectively enhancing the blue upconversion luminescence has been lacking. Herein, by integrating the pronounced UV SPR of silica-coated indium nanocrystals (InNCs) with blue-emission upconversion nanoparticles (UCNPs) of NaYbF 4 :Tm, an up to tenfold selective luminescence enhancement at 450 nm is obtained upon 980 nm laser excitation. Precise manipulation of the silica shell thickness suggests an optimal working distance of 3 nm between InNCs and UCNPs. This study has, for the first time, realized selective blue upconversion luminescence enhancement by using an inexpensive, non-noble metal material, which will not only enrich the fundamental investigations of SPRenhanced upconversion emission, but also widen the applications of blue light-emitting nanomaterials, for example, in therapeutics.

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Section: Resultssupporting

confidence: 92%

Plasmon‐Enhanced Blue Upconversion Luminescence by Indium Nanocrystals

Wang

Guo

et al. 2019

Adv Funct Materials

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“…The nanoparticles melting temperature (T mp ) and enthalpy (H mp ), among the other thermodynamic properties, have received considerable attention (Qi, 2016). Several models have been developed to predict the nanoparticles sizedependent T mp (Goldstein et al, 1992;Jiang et al, 1999;Safaei, 2010) and H mp (Zhang et al, 2000;Jiang et al, 2002;Attarian Shandiz and Safaei, 2008;Fu et al, 2017). However, developing a universal model requires an extensive effort and each model has to be verified with experimental or simulation data (Liang et al, 2017) which, to our knowledge, is not available for Pd clusters.…”

Section: Introductionmentioning

confidence: 99%

Size and shape-dependent melting mechanism of Pd nanoparticles

et al. 2018

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Molecular dynamics simulation is employed to understand the thermodynamic behavior of cuboctahedron (cub) and icosahedron (ico) nanoparticles with 2 − 20 number of full shells. The original embedded atom method (EAM) was compared to the more recent highly optimized version as interatomic potential. The thermal stability of clusters were probed using potential energy and specific heat capacity as well as structure analysis by radial distribution function (G(r)) and common neighbor analysis (CNA), simultaneously, to make a comprehensive picture of the solid state and melting transitions. The result shows ico is the only stable shape of small clusters (Pd 55 -Pd 309 using original EAM and Pd 55 using optimized version) those are melting uniformly due to their small diameter. An exception is cub Pd 309 modeled via optimized EAM that transforms to ico at elevated temperatures. A similar cub to ico transition was predicted by original EAM for Pd 923 -Pd 2075 clusters while for the larger clusters both cub and ico are stable up to the melting point. As detected by G(r) and CNA, moderate and large cub clusters were showing surface melting by nucleation of the liquid phase at (100) planes and growth of liquid phase at the surface before inward growth. While diagonal (one corner to another) melting was dominating over ico clusters owing to their partitioned

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“…We did not detect by DSC the phase change of small nanoparticles around 8 nm expected from TEM observations, which occurred at around 240 °C in an Ag matrix. 8 This could be explained by the decreased enthalpy with the particle size 14,29 or the low volume fraction of nanoparticles smaller than 10 nm. DSC further confirms the efficient role of the silica shell to limit the coalescence of Bi nanoparticles since the Bi−Al nanocomposite showed three endothermic peaks at 262, 269, and 271 °C overlapped together and shifted to higher temperature compared to the Bi@SiO 2 −Al nanocomposite, which implies the consecutive coalescence of nanoparticles into bulk objects during cycling.…”

Section: Resultsmentioning

confidence: 99%

Liquid Processing of Bismuth–Silica Nanoparticle/Aluminum Matrix Nanocomposites for Heat Storage Applications

Baaziz

Mazérolles

et al. 2022

ACS Appl. Nano Mater.

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Metal matrix nanocomposites encompassing low-melting point metal nano-inclusions are promising candidates for thermal regulation of devices at high temperature. They are usually processed by solid-state routes that provide access to a limited range of materials and are hardly compatible with complex shaping processes and with large-scale applications. Herein, we develop a liquid-phase processing technique to design aluminum matrix nanocomposites made of phase change nanoparticles, using bismuth nanoparticles as a proof-of-concept. The bismuth nanoparticles derived from colloidal chemistry are first encapsulated in a silica shell and then dispersed by ultrasonication into molten aluminum. Using X-ray diffraction, electron microscopy, and X-ray photoelectron spectroscopy, we probe the evolution of the bismuth particles and of the inorganic shell. We demonstrate that the silica shell acts as a barrier against extensive coalescence of particles during the dispersion process, thus enabling a decrease and a widening of the phase change temperature range.

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Size- and shape-dependent melting enthalpy and entropy of nanoparticles

Cited by 39 publications

References 40 publications

Plasmon‐Enhanced Blue Upconversion Luminescence by Indium Nanocrystals

Plasmon‐Enhanced Blue Upconversion Luminescence by Indium Nanocrystals

Size and shape-dependent melting mechanism of Pd nanoparticles

Liquid Processing of Bismuth–Silica Nanoparticle/Aluminum Matrix Nanocomposites for Heat Storage Applications

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