Consulta: subjectFacets:"XPS"
Registros recuperados: 3
Data/hora: 04/06/2024 05:30:18

Compréhension des mécanismes d'adhésion des biofilms en milieu marin en vue de la conception de nouveaux moyens de prévention
Provedor de dados: 5
Autores: Rubio, Celine.
Biofilm formation on surfaces immersed in sea water induces equipment damages. Recently, studies focused on the environmental impact of antifouling paints have shown that some active chemical compounds are harmful to the aquatic environment. Hence, it appears fundamental to study physico-chemical interactions existing between marine bacteria and various substrata to conceive new ecological products or antifouling processes.  First, we model an artificial primary organic film, formed by the adsorption of BSA and polysaccharide, as close as the one formed in natural seawater. This organic film is heterogeneous (only 42% of the surface is covered) and organic adsorption occurs in a multi-layer scheme, molecules bounded each others by calcium and magnesium...
Tipo: Text
Palavras-chave: Sea water; Marine bacteria; Physico chemical characterisation; MATS; XPS; IRAS; Adsorption; Bacterial adhesion; Biofim; Eau de mer; Bactéries marines; Caractérisation physicochimique; MATS; XPS; IRRAS; Adsorption; Adhésion bactérienne; Biofilm.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/these-222.pdf

Fonctionnalisation de surfaces d'acier inoxydable par des enzymes en vue d'inhiber l'adhésion de bactéries et la formation de biofilms en eau de mer
Provedor de dados: 5
Autores: Caro, A.; Humblot, V.; Minier, M.; Salmain, M.; Compère, Chantal; Pradier, C.-m.
All surfaces that are immersed in seawater rapidly become covered by nitrogenous compounds, proteins, carbohydrates, salts, silica and bacteria in a few hours, and by a grown biofilm in a few days. These biodeterioration, physical and chemical damages involve important cleaning costs. Organostanic paintings used up to now to protect the surfaces against this spoiling will be prohibited in 2008 because of their toxicity. That's why the stake today is to find alternatives to these paintings. The solution which is here suggested consists in acting on the first stages of the formation of the biofilm i.e. the proteins and bacterial adsorption on the surface. For this, the surface is chemically modified then functionalized by enzymes. Enzymes will act locally on...
Tipo: Text
Palavras-chave: Acier inoxydable; Fonctionnalisation; Enzymes; Adsorption bactérienne; PM-IRRAS; XPS; Stainless steel; Functionalization; Enzymes; Bacterial adsorption; IR; XPS.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00479/59095/61733.pdf

The promoting effect of cesium on structure and morphology of silver catalysts
Provedor de dados: 42
Autores: Carvalho,Marta C. N. A.; Perez,Carlos A.; Simão,Renata A.; Passos,Fabio B.; Schmal,Martin.
Silver supported catalysts on alpha-alumina were prepared and characterized by Brunauer-Emmet-Teller equations, scanning electronic microscopy, X-ray diffraction and atomic force microscopy techniques. Results show that these are powerful techniques for the determination of texture, morphology and surface properties. It has been shown that the addition of Cs in the Ag/Al2O3 catalyst increased the dispersion of silver with the formation of small silver particles over a thin silver film already formed over the alumina support. It is important to stress that atomic force microscopy measurements are significant to observe the film and the dispersion of Ag and, on the contrary, X-ray photoelectronic spectroscopy did not, however, it allows to the conclusion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silver; Cesium; Catalyst; AFM; XPS.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100003