In- and out-of-equilibrium transitions in Nanoalloys
Mini-colloquium to CMD2020, Madrid, Spain, august 31-sept 04, 2020
Symposium at CMD2020
Abstract submission: until April 30th, 2020
Multi-component metallic nano-objects, often called Nanoalloys, have the double advantage of coupling the properties due to size reduction at the nanoscale (from 1 to 10nm) with mixing effects or segregation between types of atoms. The diversity in the resulting arrangement makes it possible to create new nanomaterials with adjustable structures and thus to induce properties better suited to applications than pure systems, and this in many fields: fuel cells, magnetic storage, medical therapy, catalysis… This structural landscape is the result of a thermodynamics driven by surface and finite size effects, allowing through strains, mixtures or superficial segregations to achieve true engineering at the nanoscale. However, the thermodynamic equilibrium and the phase transitions modified by size or composition effects are often enriched or even supplanted by kinetic mechanisms that appear during the formation of these nanoalloys. In addition, these metastable configurations evolve to the equilibrium state on a variety of time scales. Similarly, the structural pathway of these nano-objects is modified by environment effects (atmosphere, matrix, support, liquid).
Topics that will be addressed and that are open to abstract submission are:
- Kinetics of transitions : ordering or segregation
- Size-dependent phase diagrams
- Effects of the environment on nanoalloy structure
- Strain engineering in nanoalloys
- Growth Kinetics with or without support
- Ageing : from metastable initial state to equilibrium
- Collective effects in assemblies of nanoalloys
- In situ and operando advanced techniques
- Time resolved experimental observation and modelling
This mini-symposium will be an opportunity to review the state of art and the current developments in this field. The spectacular advances are not only due to the attractiveness of the subject but also to the development of new experimental and modeling tools allowing collective and single-particle investigation at ultimate resolution (structure, property), either static or dynamic (time-resolved, multi-scale) and under environmental conditions. This colloquium will be an opportunity to promote the interactions between these themes, to clarify the future objectives within the community, and to widen it with the traditional audience of the CMD conference.
This colloquiun is supported by the international research network, IRN “Nanoalloys” (http://nanoalloys-irn.cnrs.fr/) recently created on this topic.