SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 23: Poster II
MM 23.27: Poster
Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2
Porous alumina membranes: how close to perfection? — •Marine Bossert1, Panayotis Spathis2, Pierre-Étienne Wolf2, Laurent Cagnon2, Isabelle Trimaille3, and Étienne Rolley4 — 1Institut of Materials Physics and Technology, Hamburg University of Technology, Germany — 2Institut Néel, Grenoble, France — 3Institut des NanoSciences de Paris, Paris, France — 4Laboratoire de Physique de l'Ècole Normale Supérieure, Paris, France
Alumina, and to a lesser extent, silicon porous membranes are considered often as model systems made of straight and independent pores, and, as such, porous alumina is used as templates for the synthesis of magnetic or thermoelectric materials [1].
In order to assess to which extent this ideal picture is valid, we have carried out extensive sorption measurements on membranes of different thicknesses, either native or with a pore aperture reduced by Atomic Layer Deposition. For porous silicon membranes, we find constrictions along the pore axis for all samples and interconnections between neighbouring pores when the latter are longer than 2 microns [2]. For alumina membranes, the pores are independent, but conical in shape rather than cylindrical, and rough rather than smooth. Moreover, their average diameter (along their length) is distributed from pore to pore.
We present quantitative estimates of these deviations to ideality, and discuss how to minimize them. [1] Lee and Park Chemical Reviews 2014 114 (15), 7487-7556 [2] Bossert et al, Langmuir 2021 37 (49), 14419-14428