L’AGENDA CHIMIE PARISTECH - PSL

Plasma flow reactor for functionalization of small organic molecule A presentation from Stéphanie Ognier (Chimie ParisTech - PSL)     Plasma is a powerful technology for the generation of reactive species without any catalyst. It is currently used for the modification of materials in several areas of industry but underused in the field of small molecules…

Nanoscale Turing patterns in bismuth monolayer   Yuki Fuseya  University of Electro-Communications, Tokyo   Ordered patterns can arise out of randomness during morphogenesis. An explanation for this puzzle was put forward by Turing, who explained the emergence of stational patterns by invoking the interplay between an activator and an inhibitor with different diffusion rates .…

Teaching an old foam new tricks: material design, memories and learning in aging solids Daniel Hexner Disordered solids are often out of equilibrium, evolving slowly as they age. The small incremental changes inherent in the aging process reduce the internal stresses through microscopic plastic deformations within the material. While often considered as merely a nuisance…

Zero group velocity and backward elastic guided modes in homogeneous media  Claire Prada and Alexandre Delory In elastic waveguides, the coupling between shear and compression waves results in complex dispersion effects. Indeed, negative phase velocity modes are observed in most waveguides like plates, tubes or ribbons. These modes, called 'backward', appear when two branches of…

Thermoluminescence, a tool to control defects in materials  Bruno Viana () IRCP Chimie-Paristech, Paris, France  Scientific Seminar   Friday 10th of September 2:00 PM Room Prefabriqué 1 at Chimie ParisTech - PSL     Thermoluminescence or thermally stimulated luminescence is a perfect tool to characterize the defects in the luminescent materials. In general, defects should…

On wrinkles, and what they have to do with liquid crystals A thin elastic sheet attached to a soft substrate often develops wrinkle patterns when subject to an external forcing or as a result of geometric incompatibility. Such patterns appear spontaneously in a variety of natural systems, ranging from plant tissues to drying paint and…