Conférence
Dr Clémence Allain
PPSM, ENS Paris-Saclay, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
- ABSTRACT -
Luminescent mechano-responsive molecules and materials: towards fluorescent force sensors
Fluorescent materials are able to signal different stimuli with a high sensitivity. In particular, a material is called mechano-responsive or « mechanofluorochromic » when its fluorescence emission changes upon mechanical stimulation (pressure, shearing force…). Mechanofluorochromic compounds have attracted a rapidly growing interest for the last ten to fifteen years and several series of new molecules have been synthesized. We aim at relating the molecular structure of a mechanofluorochromic dye to its sensitivity to different mechanical stimuli, and at quantifying its fluorescence response to such stimuli, with the ultimate goal of developing force sensors based on these fluorescent probes.
We have studied various series of mechanofluorochromic compounds, amongst which difluoroboron β-diketonate derivatives, triphenylamine derivatives and polydiacetylenes. Our strategies to understand and quantify their mechanofluorochromic responses at the macroscale and at the (sub)microscale will be presented. Our recent results on the covalent grafting of polydiacetylene inside microfluidic channels to detect the friction force exerted by microalgae flowing through these channels will also be presented.
This seminar is organized in conjunction with Charles Ciambrone's doctoral thesis defense (NEO).
Date: Monday, September 21
Time: 10:30 am
Place: ISM Conference Room (3rd floor)
Contacts: André DEL GUERZO & Anh Thy BUI