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.

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.
APPLIED PHYSICS LETTERS
L. Pasquini; A. Montone; E. Callini; M. Vittori Antisari; E.Bonetti
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/103447
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