3 research outputs found
Negative thermal expansion of nanoporous anodic aluminum oxide membranes
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 ÂŻ NiNW = â 1.6 ± 1.5 Ă 10 â 6 K â 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 = â 5 ± 1 Ă 10 â 6 K â 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.Fil: Forzani, Luisina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Santa Fe. Instituto de FĂsica del Litoral. Universidad Nacional del Litoral. Instituto de FĂsica del Litoral; ArgentinaFil: Ramos, C. A.. Centro AtĂłmico Bariloche (cab); ArgentinaFil: Vassallo Brigneti, Ettore Ciro. Instituto TecnolĂłgico y de Estudios Superiores de Occid; MĂ©xicoFil: Gennaro, Ana Maria. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Santa Fe. Instituto de FĂsica del Litoral. Universidad Nacional del Litoral. Instituto de FĂsica del Litoral; ArgentinaFil: Koropecki, Roberto Roman. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Santa Fe. Instituto de FĂsica del Litoral. Universidad Nacional del Litoral. Instituto de FĂsica del Litoral; Argentin