Journal
ACS APPLIED NANO MATERIALS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c03534
Keywords
aluminum; composites; nanoparticles; core-shell; bismuth; heat storage; phase change
Funding
- Stellantis
- ANRT
- OpenLab betachiPhi involving Stellantis
- Sorbonne University
- Institut des Materiaux de Paris Centre [IMPC FR2482]
- Laboratoire de Reactivite de Surface [UMR 7197]
- Sorbonne Universite
- CNRS
- C'Nano projects of the Region Ile-de-France
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In this study, we have developed a liquid-phase processing technique to design aluminum matrix nanocomposites with phase change nanoparticles. The research demonstrates that the silica shell acts as a barrier, preventing extensive coalescence of particles and broadening the phase change temperature range.
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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