Polyphenols are known for their antioxidant properties and as modulators of redox signalling pathways, which have a positive effect on human health. Given their superiority in terms of presence in systemic circulation and their often higher bioactivity than parent polyphenols, there is now more interest in the gut microbiota`s pivotal role in the p...
The objective of this work has been to expand developments that were further performed in STM towards AFM ones to broaden the range of systems which can be studied such as nanoparticles, 2D materials on conductive or insulating substrates or low-conductivity (multi) layers, passive layers and semiconductor materials among others, as mentioned earli...
This thesis project focused on the development of electrochemical tip-enhanced Raman spectroscopy (EC-TERS) for the nanoscale characterisation of gold surfaces functionalised by electroactive molecular compounds. It was based on the optimization of an experimental setup using a scanning tunnelling microscope (STM), thus allowing dynamic electrochem...
This PhD aimed at studying the influence of a radio frequency alternating magnetic field (AMF) on the water splitting reaction in alkaline media (KOH, 1 mol/L). The objective of this approach was to heat the catalyst at a very local scale to enhance water electrolysis, without heating the electrolyte and the other cell component, especially to limi...
La compréhension des mécanismes de transferts d’électrons au sein de systèmes supramoléculaires complexes constitue un enjeu majeur dans le développement de nouveaux appareils en électronique moléculaire. Durant les trois dernières décennies, la chimie supramoléculaire a connu de grandes avancées, et il est désormais possible de construire des syst...
L’électrochimie est une alternative pertinente en microfluidique de gouttes face aux méthodes optiques généralement employées pour l’analyse de petits volumes. En effet, le signal en électrochimie est proportionnel à la concentration et les microélectrodes sont facilement implantables à l’intérieur des microdispositifs. Trois approches ont ainsi ét...
Water splitting into oxygen and hydrogen is a promising route for renewable energies conversion and storage. Iron group oxides (Fe, Ni, Co) have interesting catalytic properties towards water oxidation into oxygen (OER) in alkaline electrolytes, and they are amongst the best candidates for a large-scale deployment of this energy conversion technolo...
Diversifying energy sources by incorporating cleaner technologies i.e., renewable energy sources, are expected to play an important role to move from the current non-renewable dominated energy system. One of the promising energy carriers for renewable energy systems is hydrogen, and proton exchange membrane water electrolyzer (PEMWE) is one of the ...
L'oxydation des polyphénols des vins rouges lors de leurs vieillissements implique des réactions très complexes mais constitue un véritable enjeu de recherche car elle va modifier leurs propriétés organoleptiques. Certaines voies de formation des produits d’oxydation des polyphénols ont été décrites dans la littérature. Cependant, de nombreuses étu...
Cylindrical magnetic nanowires provide a perfect platform to study the dynamics of magnetic domain wall motion, due to expected high mobility and stability of the topologically-unique Bloch-point domain wall (BPW). This thesis experimentally explores the behaviour of BPWs in individual cylindrical nanowires subjected to nanosecond-duration pulses o...
