Interfaces, Confinement, Matériaux et Nanostructures - ICMN

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GDR Nanoalliages

An new International Research Network (IRN) on Nanoalloys (starting in 2019)

An IRN is a scientific coordination network gathering French and foreign research teams from European countries, around a specific scientific topic. The network is the result of an agreement detailing the scientific content, the composition of the scientific committee and the provisional budget, signed by the authorized representative(s) of the French (CNRS and affiliated universities of research joint units) and the foreign (research organizations or universities) partner institutions.

About the IRN Nanoalloys

Alloy nanoparticles are bi- or multi-component metallic nanoparticles which are often called Nanoalloys. The tremendous growth of interest in nanoalloys comes from the fact that their chemical and physical properties can be tuned by varying the composition and degree of chemical ordering, as well as the size of the nanoparticle. The properties of nanoalloys can be very different from those of the corresponding bulk alloys and from those of single-metal nanoparticles of the same size. This makes nanoalloys suitable for a wealth of technological applications, as in data storage and optoelectronic devices, in chemical sensors, in fuel cells and as heterogeneous catalysts, in which nanoalloys can be more efficient or less expensive than single-metal catalysts. Nanoalloys are also quite interesting from a basic science point of view due to the complexity of their structures and properties and the interplay between them. They can be characterized by a new type of phase diagrams, in which a third variable, the nanoparticle size, is added to temperature and composition, which are the conventional variables of bulk phase diagrams.

Research in nanometer-size multicomponent metallic nano-objects, “Nanoalloys” is highly interdisciplinary. In fact, the scientific community working in this field comprises chemists, physicists and materials scientists. International collaborations at the European level are very often necessary for developing innovative research approaches, which very often require the close collaboration between experimental and theory/simulation groups. For such a rapidly growing and interdisciplinary field, networking initiatives are therefore of vital importance.

The aim of the Nanoalloys International Research Network is to share complementary tools and expertise developed by French and foreign colleagues in the field of nano-sized alloy particles with bi- or multi- metallic components. This network is dedicated to promote new hot topics, such as kinetic effects which control the equilibrium and out-of-equilibrium structure, environment effects on the nanoalloy structures and its impact on cluster’s chemophysical properties.

Network Coordination

  • Coordinator : Pascal Andreazza, ICMN, Interface, Confinement, Matériaux et Nanostructures, CNRS, Université d’Orléans, France
  • Vice coordinator : Riccardo Ferrando, Physics Department, Università di Genova, Italy

An “Executive Committee” and a “Scientific Committee” manage the network activities on proposition by the Coordinators :

  • the organisation of conferences, lectures, seminars, symposiums, study days, theme-based workshops or any other type of meeting dealing with the scientific theme ;
  • facilitate and encourage exchange of information and documentation on the scientific theme ;
  • identify common research projects relating to the scientific theme ;
  • coordinate replies to invitations to tender for supporting research and technological development ;
  • encourage permanent training initiatives and promote pedagogical operations.

Themes :

1. Equilibrium properties : structure and environment effects
• 1.1.Size-dependent nanoalloy phase diagrams and transitions
• 1.2. Effects of the environment (supports, matrix confinement, organic ligands, liquid environments, gas adsorption)
• 1.3. Strain engineering in binary and ternary nanoalloys
2. Out-of-equilibrium effects : kinetic, mobility, environment
• 2.1. Growth Kinetics
• 2.2. Ageing : from metastable initial state to equilibrium
• 2.3. Collective effects in assemblies of nanoalloys
3. Nanoalloy properties and their relationship with structure and environment
• 3.1. Catalytic properties : pressure gap, surface segregation, stability and chemical reactivity
• 3.2. Magnetic properties : morphologies, strain and coupling nanocomposites to improve magnetic moment and anisotropy
• 3.3. Optical properties : effect of the matrix, or ligands, morphologies and coupling in nanohybrids to tailor plasmonic properties

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