NanoMaterials under pressure |
|
People: Denis Machon |
|||
News |
Nanoparticles under high pressureTowards a thermodynamics at the nanoscale
The study of phase transition of oxide nanoparticles (ZnO, TiO2, Y2O3) allows us to better understand the effect of the surface energy in thermodynamics. To do this, we need to control the parameters of nanoparticles (surface chemistry, defects, etc.). The synthesis step is crucial to this control and is provided by a collaboration with physico-chemical experts in synthesis by physical and chemical pathways. |
 |
|
|
Référence Article |
|
Our most recent results have led us to develop a model of Ginzburg-Landau for reporting the characteristics of the phase transition of ZnO under pressure. Depending on the synthesis, this transition is changed and our model for understanding this evolution. Pressure is an innovative tool in the study of nanomaterials and allows a better understanding of physics at the nanoscale as the effect of the energy surface / interface on phase stability in the nanoparticles.
|
2D Materials: Another PhysicsMotivated by our recent results on graphene under pressure, we continue the study of 2D materials under pressure (MoS2 GaSe). In the case of graphene, we have shown that the mechanical response to hydrostatic pressure changes between two sheets material and a three-layer material. The physical (mechanical, electronic, vibrational, etc ...) are changed by the thickness of the material. For extremely low thickness (monoatomic layer) physics used for 3D materials has to take into account the effects of edge and surface effects. |
|
|
|
Référence article et légendes |
