Thursday MM 49 : Nanomaterials II
نویسنده
چکیده
Nanoporous metal prepared by the corrosion of an alloy can take the form of monolithic, millimeter-sized bodies containing approximately 1015 nanoscale ligaments per cubic millimeter. Applications have been suggested, for instance in catalysis, sensing and actuation. Although the process of dealloying has seen many studies, the underlying processes remain to be clarified in more detail. Here we explore the structure size and residual Ag content in AgAu alloys during electrochemical dealloying. We study different dealloying potentials and a series of alloys including specifically solid solutions that are dilute in Au. A major finding is that nanoporous samples with large content of residual Ag can be prepared. This is surprising in view of the overpotential required for bulk dealloying. The overpotential exceeds the variation of the Ag Nernst potential through the alloy series, suggesting that equilibrium thermodynamics of the bulk alloy alone cannot explain the arrest of the corrosion at finite Ag content. The data set acquired in our study will provide a data base for verifying models of the corrosion process that include capillary terms as well kinetic aspects such as adatom diffusion and vacancy island nucleation.
منابع مشابه
Thursday MM 37 : Nanomaterials II
We investigate magnetic properties of defective graphene, using a modified Hubbard model of the pi electrons of the carbon atoms. Spin interaction between pi elections and dangling sp2 bond has been taken into consideration. Mean field approximation is employed in our calculation, in order to deal with very large fragment of graphene. Magnetism of graphene with different types of defects will b...
متن کاملWednesday : 22 Thursday : 23 - 49 Friday : 50 - 75 Saturday : 76 - 99 Welcome ( 07 ) Keynote Speakers ( 08 - 09
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Adsorptive Removal of Cr(VI) and Cu(II) Ions from Water Solution using Graphene Oxide-Manganese Ferrite (GMF) Nanomaterials
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متن کاملPOSTER SESSION II THURSDAY , MAY 31 th , 2012 CHAIRPERSONS : A . Malenovi ć and Ł . Cie ś la
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Time : Thursday 10 : 15 – 11 : 45 Location : H 1029 MM 46 .
MM 46.1 Thu 10:15 H 1029 SiC formation in carbon nanotubes grown from permalloy catalyst particles — ∙Anja Kießling1, Darius Pohl1, Christine Täschner1, Rolf Erni2, Mark Hermann Rümmeli1, Ludwig Schultz1, and Bernd Rellinghaus1 — 1IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany — 2Electron Microscopy Center, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Düb...
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