Auswahl der wissenschaftlichen Literatur zum Thema „Acier inoxydable – Surfaces – Désinfection“
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Zeitschriftenartikel zum Thema "Acier inoxydable – Surfaces – Désinfection":
Saï, Wassila Bouzid, und Ezzeddine Triki. „INFLUENCE DES CARACTÉRISTIQUES DES SURFACES USINÉES SUR LA RÉSISTANCE À LA CORROSION D’UN ACIER INOXYDABLE AUSTÉNlTO - FERRITIQUE“. Transactions of the Canadian Society for Mechanical Engineering 30, Nr. 2 (Juni 2006): 183–90. http://dx.doi.org/10.1139/tcsme-2006-0011.
Hon, Chun-Yip. „Side-by-Side Comparison of Methods for Environmental Monitoring for Hazardous Drug Contamination“. Canadian Journal of Hospital Pharmacy 76, Nr. 2 (03.04.2023): 87–93. http://dx.doi.org/10.4212/cjhp.3275.
Dissertationen zum Thema "Acier inoxydable – Surfaces – Désinfection":
Yammine, Jina. „Nanoencapsulation of biosourced antimicrobials for a persistent disinfection of food contact surfaces“. Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR037.
The persistence of biofilms remains a worldwide problematic encountered in the agro-food industry. As a result of the adaptive resistance coupled with the physical properties of biofilm matrix, the failure to eradicate totally biofilms using conventional disinfectants urges the need to find alternative effective strategies. The current methodology developed in this work is focused on the use of biosourced essential oil terpenes, namely carvacrol (CAR) and thymol (THY) that represent powerful antimicrobial tools facing biofilms. Nanoencapsulation of terpenes is an innovative and proactive approach that stabilizes terpenes and enhances their functionalities by protecting them within a carrier shell structure and by ensuring a sustained controlled release. The results of this work reveal a greater activity of nanoencapsulated CAR and THY against Salmonella Enteritidis and Listeria innocua biofilms developed on stainless steel (SS) surfaces as compared to the activity of free terpenes. The potent antimicrobial prospects of nanocapsules were highlighted by inducing major obvious structural damages to bacterial cells with subsequent increase in permeability, promoting the leakage of intracellular vital constituents to the outer medium. After confirming the promising antibiofilm activity of monolayer (ML) nanocapsules developed by spray-drying using maltodextrin as carrier material and sodium caseinate as emulsifier, another layer-by-layer (LBL) nanocapsule was developed by adding pectin as an additional interfacial layer. The increased shell structure thickness of the LBL capsules was observed microscopically and confirmed by the increase in size. The release kinetics of terpenes from the ML and LBL capsules fitted into a Korsmeyer-Peppas mathematical model dominated by a Fickian-diffusion mechanism. The diffusion of THY and CAR out of the ML and LBL capsules was ascribed to a biphasic release profile starting with an initial rapid burst release of terpenes, followed by a second phase of steady release from the ML capsules compared to a gradual sustained release over time from the LBL capsules. The antibiofilm activities of encapsulated THY and CAR were consistent with the release curves, highlighting a promising sustained disinfection of food contact surfaces. A successive exposure to ML and LBL capsules ensured a 99.99 % eradication of biofilms with a protection of SS surfaces from recontamination for several hours. The inhibition was induced by the ML nanocapsules that ensured an initial disinfection of surfaces with a reduction of bacterial biofilms within the first exposure minutes, combined with the LBL capsules that kept releasing terpenes in a controlled manner over several hours favoring a sustained prolonged disinfection of food contact surfaces and a protection from bacterial recontamination. The prominent persistent disinfection activity using a successive treatment of ML and LBL nanocapsules was also validated on biofilms developed under different hydrodynamic conditions in a lab-scale pipeline system set-up to mimic some of the real flow conditions encountered in agro-food industries
Khamisse, Elissa. „Etude du microbiote susceptible de persister sur les surfaces d'un atelier de la filière viande bovine“. Phd thesis, AgroParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00770326.
Kozlova, Olga. „Brasage réactif Cu/acier inoxydable et Cu/alumine“. Grenoble INPG, 2008. http://www.theses.fr/2008INPG0072.
In this work we study the physico-chemical and mechanical aspects of the copper/stainless steel and copper/alumina brazed joints. In the physico-chemical part we study the wettability, the reactivity at the interfaces and the microstructure of the brazed joints. The mechanical part relates to the copper/alumina joints obtained by reactive brazing and includes tensile tests and shaft loaded blister tests. From the results we propose optimal solutions of assemblies in term of temperature, brazing time and composition of the braze
Mercier, Virginie. „Contribution à l'étude des propriétés acido-basiques et d'adhésion de surfaces d'aciers inoxydables“. Grenoble INPG, 1999. http://www.theses.fr/1999INPG0159.
Fort, Pascal. „Analyse du traitement de surface d'un acier inoxydable ferritique en vue d'applications solaires“. Toulouse 3, 1990. http://www.theses.fr/1990TOU30073.
Badin, Valentin. „Création de surfaces poreuses sur des aciers inoxydables par réduction d’oxydes sous H2 à haute température“. Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM009/document.
A process for pore creation on the surface of two stainless steels, respectively austenitic and ferritic, has been investigated. That process follows two steps. An oxide scale with controlled thickness and composition is firstly generated by water vapour exposition at 1100 °C. That layer is subsequently reduced at high temperature by dihydrogen. The present work aims to better understand the mechanisms of pore formation and the influence of various reaction parameters on both oxidation and reduction course.A comprehensive characterisation of the oxide layers has been first performed. The main parameter is the alloy structure, austenitic or ferritic. The porous surfaces have been thereafter studied to establish step by step the formation mechanisms involved.It was demonstrated that the non-stoichiometry of iron oxides formerly developed on the austenitic steel is behind the pore growth mechanism on that steel.A new kind of porosity could be obtained through the preliminary building of chromium-rich oxide scales on the ferritic steel. The morphologies are in that case completely different as well as the pore formation mechanism. A specific process for the pore growth has been proposed
Garrain, Pierre-Alain. „Etude ab initio de l'adsorption d'acides aminés et peptide sur surfaces modèles d'acier inoxydable“. Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00722645.
Touzin, Maryse. „Évaluation de la stabilité d'une couche mince de simili-téflon déposée par plasma sur un substrat d'acier inoxydable“. Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26178/26178.pdf.
Metallic stents are mainly made of 316L stainless steel. Even though this material possesses the required mechanical properties needed in a stent, its long-term safety is still controversial. Indeed, in the aggressive biological environment, this material is prone to localized corrosion attack and possible corrosion products include elements classified as carcinogenic. To improve the long-term safety of the 316L stainless steel stents, a multi-step process was previously developed in our laboratory to isolate the stainless steel surface from the body fluid by depositing an ultra-thin plasma-polymerized fluorocarbon coating. To ensure the safety and effectiveness of the ultra-thin film, a series of tests was performed. In this context, the aim of this project is to develop and realize tests allowing the evaluation of both the stability and the efficiency of the coating. Firstly, to evaluate the stability, static immersion tests were performed in different solutions. Aged and non-aged surfaces were then characterized and compared by using different surface analyses methods. Secondly, the effectiveness of the ultra-thin film against general and localized corrosion was verified using accelerated corrosion tests; i.e. cyclic polarization tests and Tafel plot corrosion measurements. In this case, different surface conditions were tested and the results were compared to see if the coating was efficient on flat substrate and under a plastic deformation, to which it will be submitted when put in the human body. Even though part of this study has shown that the ultra-thin film was unstable in an aqueous environment, another part has shown that combined pre-treatment and ultra-thin film increased the corrosion resistance of stainless steel. Furthermore, an appropriate protocol to evaluate those properties has been developed and will be most useful to evaluate future coatings deposited under different conditions.
Inscrite au Tableau d'honneur de la Faculté des études supérieures
Tarrade, Jeanne. „Conception de surfaces superhydrophobes anti-bioadhésives“. Thesis, Nice, 2014. http://www.theses.fr/2014NICE4040.
Bacterial surface contamination is a natural and spontaneous process involved in serious infections. Currently, biocidal materials are used to avoid the biocontamination. However, these methods are not sufficient because of their toxicity, their loss of efficiency over time and mainly because they can make the bacteria more resistant.The biofilm formation involving the bacterial adhesion on surfaces, new strategies have been developed with the conception of surfaces reducing their interactions with bacteria, such as superhydrophobic surfaces. In fact, bacterial adhesion could be reduced by the presence of an air layer between superhydrophobic surface and bacteria. In this project, two substrates have been made superhydrophobic: 316 stainless steel by electrodeposition of hydrocarbon or fluorocarbon polymers, derived from poly(3,4- ethylenedioxythiophene), and PET by successive plasma treatments of oxygen, polypyrrole and CF4. The control of experimental parameters led to different water repellency and surface morphologies, and allows the study of the effect of these physico-chemical properties on the bioadhesion and the biofilm formation with three bacteria: P. aeruginosa, L. monocytogenes and S. aureus. Thus, it has been shown the important role of fluorinated chains and controlled surface structures to reduce the surface biocontamination
Kempf, Didier. „Caractérisation mécanique des surfaces et interfaces aux échelles micrométrique et nanométrique : étude des processus d’oxydation et de piqûration“. Dijon, 2007. http://www.theses.fr/2007DIJOS061.
To predict the service time of metallic alloys, a multi-disciplinary approach is essential. The roles of mechanical, physical and chemical parameters on pit initiation will be studied. The aim of this present work is to develop new mechanical methodologies at the microscopic scale to quantify the strain gradients and the mechanical properties of the alloy surfaces. These specific methodologies will be applied to the study of the influence of the microstructure and the mechanics in the oxidation and pit initiation process. First, strain gradients induced by a mechanical solicitation will be quantified at the microscopic scale using the grating method (with metallic dots of 70 nm in diameter). A study on the influence of the heterogeneous strain fields and microstructure on pit initiation is proposed. Second, the influence of microstructure and strain mapping on the oxidation process of duplex stainless steel at the microscopic scale was studied. Grating method with non-metallic dots was used to map the heterogeneous strain field at the interface between the substrate and the thermal-oxide film. Local Auger spectroscopy was used to determine the thickness and the compositions of oxide films. At last, nano-indentation tests have been done to identify the behaviour laws of the duplex stainless steel at the grain scale. Many tests have been done with different indenter geometries in order to apply the analytical models available in the literature. The elasto-plastic parameters have been determined coupling the nano-indentation test with X-ray diffraction and finite element simulation of the nano-indentation test. Then, the grain rheologies founded have been inserted in a predictive finite element model of the duplex stainless steel behavior