We report on the formation of hollow structures driven by a phase transition that proceeds via diffusion through a membrane. The mechanism is demonstrated for Mg/MgO core/shell nanoparticles: When they undergo successive metal-hydride transitions at sufficiently high temperature, the core material progressively diffuses outward and evaporates, leaving a hollow shell with the original shape and thickness. This phenomenon might become a general approach to the design of materials with controlled porosity.
L. Pasquini, A. Montone, E. Callini, M. Vittori Antisari, E.Bonetti (2011). Formation of hollow structures through diffusive phase transition across a membrane. APPLIED PHYSICS LETTERS, 99, 021911-1-021911-3 [10.1063/1.3610973].
Formation of hollow structures through diffusive phase transition across a membrane
PASQUINI, LUCA;CALLINI, ELSA;BONETTI, ENNIO
2011
Abstract
We report on the formation of hollow structures driven by a phase transition that proceeds via diffusion through a membrane. The mechanism is demonstrated for Mg/MgO core/shell nanoparticles: When they undergo successive metal-hydride transitions at sufficiently high temperature, the core material progressively diffuses outward and evaporates, leaving a hollow shell with the original shape and thickness. This phenomenon might become a general approach to the design of materials with controlled porosity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
