info:eu-repo/semantics/article
Negative thermal expansion of nanoporous anodic aluminum oxide membranes
Fecha
2019-03Registro en:
Forzani, Luisina; Ramos, C. A.; Vassallo Brigneti, Ettore Ciro; Gennaro, Ana Maria; Koropecki, Roberto Roman; Negative thermal expansion of nanoporous anodic aluminum oxide membranes; American Institute of Physics; Applied Physics Letters; 114; 11; 3-2019
0003-6951
CONICET Digital
CONICET
Autor
Forzani, Luisina
Ramos, C. A.
Vassallo Brigneti, Ettore Ciro
Gennaro, Ana Maria
Koropecki, Roberto Roman
Resumen
We have measured the thermal expansion of Ni nanowires (NWs) electrodeposited into self-organized nanoporous amorphous aluminum oxide (AAO) membranes without an Al substrate using X-ray diffraction between 110 K and 350 K. The results indicate an average thermal expansion of the Ni NWs - along the wire axis - of α ¯ NiNW = − 1.6 ± 1.5 × 10 − 6 K − 1. Assuming a bulk-like thermal expansion of the isolated Ni NWs, this result indicates that AAO also has a negative thermal expansion. We estimate the thermal expansion of nanoporous AAO to be α AAO = − 5 ± 1 × 10 − 6 K − 1. We show that data obtained previously on the thermal expansion of metallic NWs grown in the nanoporous AAO may be interpreted as originating from a negative thermal expansion of the matrix.