RT Journal Article
T1 Development and thermophysical profile of cetyl alcohol-in-water nanoemulsions for thermal management
A1 Cabaleiro Álvarez, David
A1 Losada Barreiro, Sonia
A1 Agresti, Filippo
A1 Hermida Merino, Carolina
A1 Fedele, Laura
A1 Lugo Latas, Luis
A1 Barison, Simona
A1 Martínez Piñeiro, Manuel
K1 2213 Termodinámica
K1 2210.18 Física del Estado Liquido
AB This study focuses on the preparation, thermophysical and rheological characterization of phase change material nanoemulsions as latent functionally thermal fluids. Aqueous dispersions with fine droplets of cetyl alcohol (with a melting temperature at ~321 K) were prepared by means of a solvent-assisted method, combining ultrasonication with non-ionic and anionic emulsifiers. Eicosyl alcohol (melting at ~337 K) and hydrophobic silica nanoparticles were tested as nucleating agents. Droplet size studies through time and after freeze–thaw cycles confirmed the good stability of formulated nanoemulsions. Phase change analyses proved the effectiveness of eicosyl alcohol to reduce subcooling to a few Kelvin. Although phase change material emulsions exhibited thermal conductivities much larger than bulk cetyl alcohol (at least 60% higher when droplets are solid), reductions in this property reached 15% when compared to water. Samples mainly showed desirable Newtonian behavior (or slight shear thinning viscosities) and modifications in density around melting transition were lower than 1.2%. In the case of phase change material nanoemulsions with 8 wt.% content of dispersed phase, enhancements in the energy storage capacity overcome 20% (considering an operational temperature interval of 10 K around solid–liquid phase change). Formulated dispersions also showed good thermal reliability throughout 200 solidification–melting cycles.
PB Fluids
SN 23115521
YR 2021
FD 2021-12-29
LK http://hdl.handle.net/11093/2946
UL http://hdl.handle.net/11093/2946
LA eng
NO Fluids, 7(1): 11 (2021)
NO European Commission | Ref. SOE2 / P1 / P0823
DS Investigo
RD 13-dic-2024