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Publications scientifiques

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Formation and ageing of aerosols : impact of heterogeneous photochemistry

... des océans et, par extension, sur les aérosols marinsInterfaces are ubiquitous in the environment, and in addition many key atmospheric processes, such as gas deposition, aerosol and cloud formation are, at one stage or the other, strongly affected by physical and chemical processes occurring at interfaces. Unfortunately, these heterogeneous reactions are not fully understood to date and limit our ability to simulate and quantify the impact of aerosols due to large uncertainties in their formation and their evolution in the troposphere. This thesis aims to improve our knowledge about photochemical reactions at the air/liquid interfaces, which could be crucial for the assessment of their atmospheric impacts....

recherche et propriété intellectuelle / activité agricole - core.ac.uk -

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Compréhension des mécanismes d'adsorption et des comportements tribologiques des acides gras c18 sur des surfaces à base de fer par la modélisation moléculaire

...The current requirements in automotive lubrication impose complex formulation. Among all the additives present in oil, the presence of molybdenum dithiocarbamate and zinc dithiophosphate, both tribological additives containing sulfur and phosphorous is found. For environmental reasons, it is important to reduce or eliminate the presence of these two elements contained in oil. Organic molecules based on carbon, oxygen and hydrogen seems to be good candidate. The lubrication mechanism of fatty acids (e.g. stearic, oleic and linoleic acids) is revisited with a new approach combining experimental and computational chemistry studies. First, the adsorption mechanisms of fatty acids on iron-based surfaces are investigated by Ultra-Accelerated Quantum Chemistry Molecular Dynamics simulations. The adsorption of fatty acids on iron oxide surface occurred through the acid group. Depending on the nature of the substrate, on the density of the film and on the tilt angle between the molecule and the surface, different adsorption mechanisms (physisorption and chemisorption) can occur....

sciences naturelles et appliquées - core.ac.uk - PDF: bibli.ec-lyon.fr

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Films mesoporeux photocatalytiques de tio2 non dope et dope par differents metaux (elaboration, caracterisation et etude des proprietes photocatalytiques)

... Une étude complète des propriétés photocatalytiques des films à base de TiO2 aux interfaces solide-solide, solide-liquide et solide-gaz a été réalisée en utilisant respectivement les tests avec de l acide stéarique, du bleu de méthylène et de l acétone....

... In order to better characterize and compare the efficiency of these films at solid-solid, liquid-solid and air-solid interfaces, several tests were used: mineralization of stearic acid, photobleaching of methylene blue and photooxidation of acetone...

Europe / recherche et propriété intellectuelle - core.ac.uk - PDF: www.theses.fr

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Raman and brillouin studies on polytype structures and physical properties of n-alkanes and n-fatty acids

On a fait croître des monocristaux des polytypes monocouche (Mon) et double couche (Orth II) des configurations monocliniques de n-alcanes et d'acide stéarique (forme B) et on a étudié leur structure et leurs propriétés physiques....

général - core.ac.uk -

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Formation et vieillissement des aérosols : impact de la photochimie hétérogène

...Interfaces are ubiquitous in the environment, and in addition many key atmospheric processes, such as gas deposition, aerosol and cloud formation are, at one stage or the other, strongly affected by physical and chemical processes occurring at interfaces. Unfortunately, these heterogeneous reactions are not fully understood to date and limit our ability to simulate and quantify the impact of aerosols due to large uncertainties in their formation and their evolution in the troposphere. This thesis aims to improve our knowledge about photochemical reactions at the air/liquid interfaces, which could be crucial for the assessment of their atmospheric impacts....

recherche et propriété intellectuelle / Europe - core.ac.uk -

Synonymes et termes associés français

atomicité, cohérence, isolement, durabilité

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ACID

Traductions en contexte français - anglais