CHEMISTRY AND WAVES : AN OCEAN
Microwave-assisted synthesis and functionalization, high-temperature chemistry, non-thermal microwave effects, ultrafast spectroscopy, XPS, THz imaging, OLEDs, ILEDs, blue phase, luminescence, optical amplification, electro-optic materials & modulators, imaging nanoprobes, MRI, optical and ultrasonic imaging.
Pierre LE BARNY (ASA Université de Lille, FR), Corinne CHANEAC (Sorbonne Université, CNRS, Collège de France, Paris, FR), Stefan HAACKE (IPCMS, CNRS, UNISTRA, FR), Mario LECLERC (Université Laval, Québec, CA)
According to the intricate light-particle duality highlighted by A. Einstein in 1905, all matter can exhibit wave-like behavior and vice versa. Along these lines, the symposium "Chemistry and Waves" focuses on how this duality nurtures today's research on frontiers in the interdisciplinary role of chemistry through the interfaces with physics, biology and material science. Four interdisciplinary topics are suggested that cover large aspects of such research subject.
Innovation in materials synthesis
Innovative synthesis of nanoparticles and functional hybrid materials requires the control of interface interactions that are the source of growth control and / or organization of material. A new impulse is expected with the use of microwaves giving spectacular results. Quick reactions and energy efficiency induced by microwave absorption dramatically increase the kinetics of reactions, shift the chemical equilibria of species in solution and modify the adsorption selectivity at interfaces. For example, the fast heating rates triggered by microwave increase the different cation reactivity and facilitate the synthesis of binary oxides. It can also create hot spots using components having high dielectric constant that can induce heterogeneous nucleation. This technique that is rarely used in the development of nano and hybrid materials as well as nanoparticle functionalization opens new perspectives to tune chemical and surface composition, structures, morphologies and unusual organization.
New concepts and material characterization methods using EM waves
The development of high-end materials is not only a challenge from the synthesis point-of-view, but would not be possible without state-of-the-art photochemical characterization procedures (e.g. XPS, time-resolved spectroscopies, THz imaging etc). These are rapidly evolving, since new concepts and techniques are emerging as to how waves interact with nanomaterials. In addition, the latter are now an integral part of material chemistry. As an example, time-resolved spectroscopy establishes a fertile interdisciplinary feedback loop between scientists active in modern photochemistry and opto-electronics or nanomaterials for health.
Optoelectronics, information and communication technology
Flat panel displays play an essential role in our everyday life. Promising new comers like blue phase liquid crystals have demonstrated the possibility to reproduce images at 240Hz frame rate without any alignment layer. Organic light emitting diodes (OLEDs) displays which lead to thinner screen and improved color rendering are now implemented in some commercially devices. Micro inorganic light emitting diodes (µ-ILEDs) could also be the technology for true flexible displays with improved lifetime. For telecommunications of the future operating at frequency higher than 110GHz, electro-optic polymers with improved thermal stability remain very promising for making Mach-Zehnder interferometers with driving voltage less than 1V at the telecom wavelength of 1.55µm. Amplification of telecommunication signals required for a variety of loss compensated components is currently achieved using well-established planar integrated optics technology based on erbium doped glass or silica-on silicon. The strong demand for increased bandwidth has generated a lot of interest for Er complexes which are compatible with polymers processing to achieve low cost components.
New materials for Medical imaging
Improvement in medical applications is expected to be of major benefit to society within the next years, especially for patients suffering from cancer, cardiovascular diseases, neurological disorders, inflammatory or infectious diseases. The development of new imaging tools that refers to a broad class of technologies used to look inside of the body in order to diagnose various pathologies is a challenging task to obtain more reliable and early diagnosis. These technologies using ultrasonic, magnetic or electromagnetic waves are becoming routine procedures in hospitals. Development of new materials for the improvement of such techniques and emergence of original contract agents are of the utmost importance in diagnostic imaging as they can greatly increase the sensitivity of an imaging technique allowing for the diagnosis of previously undetectable pathologies.
This symposium aims at bringing together leading chemists, physicists, engineers to share recent breakthroughs in these topics and to address the grand challenges in a forward-looking perspective.