Relevant bibliographies by topics / Modifications de surfaces

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Modifications de surfaces'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Modifications de surfaces"

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de Jonge, Lise T., Sander C. G. Leeuwenburgh, Joop G. C. Wolke, and John A. Jansen. "Organic–Inorganic Surface Modifications for Titanium Implant Surfaces." Pharmaceutical Research 25, no. 10 (May 29, 2008): 2357–69. http://dx.doi.org/10.1007/s11095-008-9617-0.

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Liu, Siyuan, Chaosheng Song, Caichao Zhu, and Qi Fan. "Concave modifications of tooth surfaces of beveloid gears with crossed axes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 4 (April 4, 2018): 1411–25. http://dx.doi.org/10.1177/0954406218768842.

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The mathematical models of the beveloid gear surfaces with different scenarios of combinations of profile concave modification and lead crowning are derived. Four schemes of modifications were proposed for beveloid gears with crossed axes. Tooth contact analysis is developed to study the influences of different schemes of concave modifications on the mesh behaviors including film thickness, transmission errors, contact ratio, root stresses, and contact patterns. Comparison of the contact characteristics of a beveloid gear drive with and without concave modifications is conducted. The results show that all the concave modification schemes can increase the area of contact patterns and decrease the maximum value of contact stresses, while the minimum film thickness can be increased. For the scheme i.e. the pinion with profile crowning modification and gear with profile concave modification, the contact ratio increases firstly then decreases to a relative lower value. Also, the root stresses are increased obviously. For the scheme for pinion without modification and gear with lead concave modification and the scheme for both pinion and gear with lead concave modification, the transmission errors are decreased slightly. The scheme for the pinion with combined crowning modification and gear with combined concave modification shows the largest improvement for the mesh behaviors in terms of the transmission errors and contact patterns where an almost contact condition can be found for the crossed beveloid gear pair.
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de Mel, Achala, Brian G. Cousins, and Alexander M. Seifalian. "Surface Modification of Biomaterials: A Quest for Blood Compatibility." International Journal of Biomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/707863.

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Cardiovascular implants must resist thrombosis and intimal hyperplasia to maintain patency. These implants when in contact with blood face a challenge to oppose the natural coagulation process that becomes activated. Surface protein adsorption and their relevant 3D confirmation greatly determine the degree of blood compatibility. A great deal of research efforts are attributed towards realising such a surface, which comprise of a range of methods on surface modification. Surface modification methods can be broadly categorized as physicochemical modifications and biological modifications. These modifications aim to modulate platelet responses directly through modulation of thrombogenic proteins or by inducing antithrombogenic biomolecules that can be biofunctionalised onto surfaces or through inducing an active endothelium. Nanotechnology is recognising a great role in such surface modification of cardiovascular implants through biofunctionalisation of polymers and peptides in nanocomposites and through nanofabrication of polymers which will pave the way for finding a closer blood match through haemostasis when developing cardiovascular implants with a greater degree of patency.
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Poon, Jeffrey, Christopher Batchelor-McAuley, Kristina Tschulik, Robert G. Palgrave, and Richard G. Compton. "Bifunctional redox tagging of carbon nanoparticles." Nanoscale 7, no. 5 (2015): 2069–75. http://dx.doi.org/10.1039/c4nr06058j.

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Despite extensive work on the controlled surface modification of carbon with redox moieties, to date almost all available methodologies involve complex chemistry and are prone to the formation of polymerized multi-layer surface structures. The modification method in this paper provides a generic approach to monolayer modifications of carbon and carbon nanoparticle surfaces.
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Anjum, Shamaa, and Arvina Rajasekar. "Surface Modification of Dental Implants - A Review." Journal of Evolution of Medical and Dental Sciences 10, no. 17 (April 26, 2021): 1246–50. http://dx.doi.org/10.14260/jemds/2021/265.

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The use of dental implants for the replacement of missing teeth has increased in the last 30 years. The success rates for implant placement depend on a series of both biological and clinical steps which starts with primary stability that is being provided by the amount, quality and the distribution of bone within the proposed implant site. The most important factor in implant osseointegration is surface roughness, which shows increased osteoblast activity at 1 to 100 μm of the surface roughness when compared to a smooth surface. Rough surfaces have excellent osseointegration than smooth surfaces, but the results of research have been diverse, and it is evident that multiple treatments provide good results. The surfaces of a dental implant have been modified in several ways to improve its biocompatibility and speed up osseointegration. Literature says that any surface modification provides a good surface for osseointegration of the implant when the surface roughness is about 0.44 ~ 8.68 μm. It is also said that acid etching and coating are the most preferred methods for creating good roughness of the implant surface. From animal studies, it is known that implant surface modifications provided by biomolecular coating seemed to enhance the osseointegration by promoting peri-implant bone formation in the early stages of healing. It also seemed to improve histomorphometric analysis and biomechanical testing results. This article reviews the surface modifications of dental implants for the achievement of better success rates. Various methods are used to modify the topography or the chemistry of the implant surfaces which includes acid etching, anodic oxidation, blasting, treatment with fluoride, and calcium phosphate coating. These modifications provide a faster and a stronger osseointegration.1 Recently, hydrophilic properties added to the roughened surfaces or some osteogenic peptides coated on the surfaces shows higher biocompatibility and have induced faster osseointegration compared to the existing modified surfaces. With development in surface engineering techniques, new information on the properties, behaviour, and the reaction of various materials could be discovered which in turn allows the discovery of new materials, modification techniques and design of bio implants for the future. KEY WORDS Dental Implants, Surface Modifications, Biocompatibility, Surface Topography
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Vansant, E. F., and P. Cool. "Chemical modifications of oxide surfaces." Colloids and Surfaces A: Physicochemical and Engineering Aspects 179, no. 2-3 (January 2001): 145–50. http://dx.doi.org/10.1016/s0927-7757(00)00650-6.

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Jiang, W. Y., J. Q. Liu, M. G. So, K. Myrtle, K. L. Kavanagh, and S. P. Watkins. "Surface modifications induced by bismuth on (001) GaAs surfaces." Journal of Crystal Growth 277, no. 1-4 (April 2005): 85–90. http://dx.doi.org/10.1016/j.jcrysgro.2005.01.060.

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Smith, Jeremy R., Jérôme Leveneur, and John V. Kennedy. "Design of intelligent surfaces for energy intensive processing industry." MATEC Web of Conferences 185 (2018): 00001. http://dx.doi.org/10.1051/matecconf/201818500001.

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There are three different factors that can affect adhesion: the process fluid, the processing conditions and the surface of the processing equipment. Of these three factors, the surface properties of the processing equipment are the factor that offers the greatest opportunity for manipulation. The two key surface properties that have been identified to reduce adhesion are the surface energy and the surface topography. The surface energy of a material determines its degree of wettability and, a surface's affinity for water. In previous studies the surface energy of materials have been leveraged in order to create a surface with reduced levels of fouling through surface modification or the addition of polymer coatings with varying degrees of hydrophobicity. In addition, the topography of surfaces has been modified to reduce the level of particle adhesion. These modifications involve creating either a structured or random porous microstructure on the surface. Additional methods identified to reduce fouling include the application of liquid infused porous surfaces at low shear conditions and the use of non-contact heating through techniques such as microwave processing.
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Lin, Hung-Ta, and Han-Yi Cheng. "Study on Cell Behavior on Surfaces with Various Nanostructured Modifications." Journal of Biomaterials and Tissue Engineering 9, no. 8 (August 1, 2019): 1021–26. http://dx.doi.org/10.1166/jbt.2019.2106.

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Several researchers have developed finite element analysis (FEA) models on dental implants; however, few have used it to investigate the effects of nanosurface treatment on the cell-implant interface. For cell proliferation and differentiation are believed related to the physical stimulations of modification surfaces. In the present study, the cell adhesion affected by mechanical stimulation from substrate was evaluated by culturing the MG-63 osteoblast-like cells on Ti materials with different chemical composition using computer-aided programs. Three types of surfaces were made by mechanically abraded, anodized and anodized following with hydrothermal treatment on Ti substrates. The cell adhesion behavior was promoted because the physical stimulation of specific surface topography provided cells mechanical external forces. The finite element analysis (FEA) was used to investigate the deformations stresses which cells were suffered on these 3 different modifications surfaces. Results indicated that cells in the HTT group were received larger stimulation of deformations and stresses than the control group (P > 0.01). This confirmed that the superior cell proliferation and differentiation resulted from the specific roughly surfaces of HYT surface for implants.
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Niino, Kiyoshi. "On finite modifications of algebroid surfaces." Kodai Mathematical Journal 8, no. 3 (1985): 296–306. http://dx.doi.org/10.2996/kmj/1138037097.

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Dissertations / Theses on the topic "Modifications de surfaces"

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Boyd, Robert Deric. "Oxidative modifications of polymer surfaces." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5180/.

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Non-equilibrium plasma modification of polymer surfaces in an oxygen atmosphere provides a highly efficient, solventless method of raising the surface energy. The chemical and physical effects of non-equilibrium plasma treatment on polymer surfaces have been investigated. Oxygen glow discharge and silent discharge treatment of several polymers (polypropylene, polystyrene, polyphenylene oxide and polycarbonate) has been shown to cause both surface oxidation and chain scission at the polymer surface. This generates low molecular weight oxidised material on the polymer surface which conglomerates into globular features due to the difference in surface energy between the oxidised material and the untreated polymer. These features can be removed by solvent washing. Generally silent discharge treatment generates more low molecular weight oxidised material whereas oxygen glow discharge treatment generates more non-soluble oxidised material. Crystalline polymers react at a slower rate than amorphous material. During the treatment of a model crystalline polymer (hexatriacontane) the plasma attacks the edges of the crystal, rather than the surface, due to the greater chain mobility at the edge. Non-equilibrium plasma treatment of both miscible and immiscible polymer blends were investigated. The size and distribution of the globular features formed were found to be dependent on the blend composition. For the immicible polymer blend, non-equilibrium plasma treatment reveals the blend morphology mi sing from the difference in reaction rates of the parent polymers.
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Clark, Stuart E. "Excimer-laser-induced modifications of optical surfaces." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/33023.

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The work in this thesis is a study of the interactions of a well characterized high power ultra violet excimer laser beam with solid optical quality surfaces, principally Al and Ge but with limited work on dielectrics. In order to characterize the beam and to monitor the changes induced on test surfaces by the beam, a computer controlled image processing system was developed. The system used the fluorescence from a UV absorbing glass to image the excimer beam and Schlieren imaging of the test surfaces with cw HeNe or pulsed dye laser illumination to monitor the induced changes.
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Casimiro, Jessie. "Modifications de matériaux polymères pour des visées antibactériennes." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00651058.

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Maîtriser la biocontamination surfacique et les risques susceptibles d'y être associés demeure un challenge majeur. Cette maîtrise passe par la préparation de nouveaux matériaux polymères possédant des propriétés de surface adaptées. Dans cette optique le LCOM développe depuis quelques années une thématique consistant à mettre au point des méthodes de modifications de surfaces de matériaux polymères par greffage de biomolecules. [ ] [ ] [ ] Dans ce contexte, l'objectif de cette étude est de fonctionnaliser des films polymères de type poly (téréphtalate d'éthylène) (PET) avec des dérivés sucrés et/ou polysaccharides dans le but d'étudier le caractère bactériostatique, biocide et pro ou anti-adhésion. [ ] La préparation des matériaux se fait en plusieurs étapes :Etape 1 : Fonctionnalisation de surfaces polymères (films) par traitement plasma N2/H2 et NH3 pour introduire à la surface des fonctions amines. Cette technique modifie la surface sans changer les propriétés intrinsèques des matériaux.Etape 2 : Greffage d'un amorceur de polymérisation radicalaire par transfert d'atome (ATRP)Etape 3 : Polymérisation en surface d'un monomère sucré par ATRP (contrôle de la longueur des chaînes greffées). La mise au point des paramètres de polymérisation ATRP de ces monomères est d'abord menée en solution avant d'étudier la polymérisation en surface.Etape 4 : Etudes microbiologiques des surfaces modifiées.Après chaque étape de modification de surface, les matériaux sont caractérisés par différentes méthodes d'analyses telles que : la spectroscopie de photoélectrons X (XPS), la microscopie à force atomique, la chromatographie d'exclusion stérique. Des glycopolymères protégés et déprotégés issus du galactose et de la glucosamine ont été synthétisés. Ceux issus de la glucosamine ont été synthétisés afin de mimer les propriétés antibactériennes du chitosane. Le glycomonomère issu du galactose est polymérisé par ATRP par voie " grafting from " sur des surfaces de PET. Ces surfaces modifiées présentent des propriétés anti-adhésives intéressantes contre les bactéries du type Bacillus subtilis. En effet, après greffage du glycomonomère déprotégé, il n' ya plus d'adhésion de bactéries. Des polymères contenant des fonctions ammonium quaternaire et fluor ont aussi été greffés avec succès sur les films de PET par la même méthode.
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Mateos, Mickaël. "Modifications électrochimiques de surfaces et dispositifs électroniques organiques." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK039/document.

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L’électronique organique reste un domaine de recherche prolifique grâce à la diversité de structures moléculaires accessible par la synthèse organique. Les matériaux moléculaires offrent des possibilités de mises en forme inédites comme les techniques de dépôt en solution, utilisables dans la conception de dispositifs organiques sur supports plastiques. Nos travaux de recherche mêlent électrochimie, conception et caractérisations électriques de dispositifs et mesures capteur. Ils abordent deux thématiques : l’élaboration de nouveaux transducteurs à base de polyanilines substituées et de phtalocyanines et l’étude de l’influence de la modification électrochimique de surface sur le comportement de dispositifs connus.Nous avons tout d’abord élaboré des hétérojonctions latérales polymère – phtalocyanine en utilisant les propriétés des polyanilines. De par leur géométrie, ces nouveaux dispositifs diffèrent de l’hétérojonction MSDI (Molecular Semiconductor – Doped Insulator), transducteur conductimétrique bicouche développé au laboratoire pour la détection de gaz comme l’ozone ou l’ammoniac. La caractérisation complète de la poly(2,3,5,6-tétrafluoroaniline) indique que ce polymère est peu conducteur, en comparaison de la polyaniline dont la conductivité peut être augmentée par dopage acido-basique. La présence des fluors empêche l’émergence du régime conducteur que l’on retrouve en milieu acide pour la polyaniline et la poly(2,5-diméthoxyaniline). Ces trois polymères, électrodéposés sur électrodes d’ITO interdigitées ont permis, après sublimation de la bisphtalocyanine de lutécium, de construire les hétérojonctions latérales. Le comportement électrique des différents dispositifs, étudié notamment par spectroscopie d’impédance, diffère en fonction de la nature des substituants de la polyaniline électrodéposée. Enfin, des mesures capteur ont montré la possibilité de détecter l’ammoniac en milieu humide, avec une limite de détection sub ppm.De précédents travaux sur l’élaboration de MSDI ont souligné le rôle primordial des interfaces, notamment dans le cas des n-MSDI qui présentent une hétérojonction p-n. Outre le changement de la nature chimique de la sous-couche employée, une autre manière de jouer sur les interfaces est de modifier électrochimiquement la surface des électrodes interdigitées, par réduction de sels de diazonium. Nous avons ainsi greffé différents benzènes substitués, dont certains ont conduit à la formation de multicouches comme l’ont révélée des mesures de microbalance à quartz électrochimique. Les différentes modifications de surface ont surtout joué le rôle de barrière isolante, amplifiant le comportement non linéaire des caractéristiques courant-tension des MSDI. Le greffage du 2,5-diméthoxybenzène a permis d’améliorer significativement la sensibilité à l’ammoniac de la MSDI à base d’hexadécafluorophtalocyanine de cuivre et de bisphtalocyanine de lutétium, avec une limite de détection de l’ordre de 200 ppb
Organic electronics remains a fruitful research field thanks to the diversity of molecular structures reachable by organic synthesis. Molecular materials offer convenient shaping processes, such as solution processing techniques, which can be used for the fabrication of organic devices on plastic substrates.Our works can be summarized as the elaboration of conductometric devices thanks to electrochemistry and the study of their electrical and sensing properties. They deal with two topics: the development of new transducers based on substituted polyanilines and phthalocyanines and the study of the influence of electrochemical modifications on the behavior of known devices.We first developped polymer - phthalocyanine lateral heterojunctions using the properties of polyanilines. Because of their geometry, these new devices differed from the MSDI heterojunction (Molecular Semiconductor - Doped Insulator), a bilayer-based conductometric transducer developed in the laboratory for the detection of gases such as ozone or ammonia. The comprehensive study of poly (2,3,5,6-tetrafluoroaniline) indicated that this material was a poor conducting polymer, compared to polyaniline whose conductivity can be increased by acid-base doping. The presence of fluorine atoms prevented the emergence of the conductive regime found in acidic medium for polyaniline and poly (2,5-dimethoxyaniline). These three polymers, electrodeposited on interdigitated ITO electrodes, allowed us, after sublimation of the lutetium bisphthalocyanine, to build lateral heterojunctions. The electrical behavior of the different devices, studied in particular by impedance spectroscopy, differed according to the nature of the substituents of the electrodeposited polyaniline. Finally, sensing measurements revealed their efficiency to detect ammonia in humid atmosphere, with a sub-ppm limit of detection.Previous works on the development of MSDI emphasized the primary role of interfaces, particularly in the case of n-MSDI that contained a p-n heterojunction. In addition to the modification of the chemical nature of the underlayer, another way to play with the interfaces is to electrochemically modify the surface of the interdigitated electrodes by reducing diazonium salts. Thus, we grafted various substituted benzenes, some of which led to the formation of multilayers as revealed by electrochemical quartz microbalance measurements. The various surface modifications mainly acted as an insulating barrier that amplified the nonlinear behavior of the current-voltage characteristics of MSDI. The grafting of 2,5-dimethoxybenzene significantly improved the ammonia sensitivity of MSDI based on copper hexadecafluorophthalocyanine and lutetium bisphthalocyanine, with a limit of detection of around 200 ppb
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Simonin, Jacques. "Evolution des propriétés de surface des pigments organiques par modifications physico-chimiques." Mulhouse, 1996. http://www.theses.fr/1996MULH0457.

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Ce travail avait pour but de faire évoluer certaines propriétés des pigments organiques telles que le dégorgement ou la migration, en relation directe avec leur solubilisation aussi partielle qu'elle soit dans le milieu d'application. Pour remédier à ces problèmes, les pigments ont été considérés comme des solides, leurs surfaces pouvant être modifiées par différents procédés physico-chimiques. Deux pigments organiques appartenant à la famille des pigments azoïques, de type Beta Naphtol, ont été retenus respectivement pour leur caractère hydrophile ou hydrophobe. Nous avons étudié les interactions obtenues par co-broyage humide des pigments organiques et d'une silice en milieu polaire et apolaire, le but étant de mettre à profit la création de nouvelles surfaces plus réactives. Le co-broyage de ces deux composés correspond à un broyage simultané faisant intervenir des processus d'enrobage de la silice par le pigment. Néanmoins aucune chimisorption du pigment n'a été obtenue après extraction aux solvants des pigments. Des réactions de greffage impliquant la formation de liaisons covalentes entre les pigments et la surface d'un solide (la silice) par l'intermédiaire d'un agent de couplage de type aminosilane ont été également étudiées. Ce procédé se déroule en plusieurs étapes et permet d'obtenir des produits colorés qui ne dégorgent plus malgré de faibles taux de greffage. Enfin, l'adsorption de polymères (PVA) en surface des pigments a été examinée. La coacervation des polymères peut conduire à des phénomènes d'enrobage et donc à la formation de microcapsules protectrices. Ce procédé permet d'insolubiliser les pigments en tenant compte néanmoins des problèmes de mise en oeuvre et de migration des molécules colorantes à travers la couche protectrice.
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Nicolas, Costa Gines. "Etude des mécanismes d'ablation et des modifications induites sur matériaux céramiques par rayonnement laser UV." Aix-Marseille 1, 1997. http://www.theses.fr/1997AIX11017.

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Ce travail concerne l'etude theorique et experimentale de l'interaction entre un rayonnement laser uv et des materiaux ceramiques dans le but de comprendre les phenomenes mis en jeu et d'appliquer les resultats au traitement de surface. Ce memoire comporte deux parties : - la premiere debute par une description generale des materiaux etudies (aln, sic, al203, zr02), de leurs proprietes, de leur mode d'elaboration et de leurs principales utilisations. Ce premier chapitre est suivi d'une presentation des phenomenes d'interaction qui se deroulent au cours de l'irradiation d'un materiau solide par un rayonnement laser. Un troisieme chapitre aborde le probleme des instabilites de surface qui perturbent et degradent la qualite du traitement laser. Un modele correspondant a nos ocnditions a ete etudie de maniere a predire theoriquement les regimes pour lesquels un lissage de la surface pouvait etre obtenu. - la deuxieme concerne le travail experimental realise. Une description du dispositif experimental et des procedes de controle mis en place est donnee. Un certain nombre de techniques de caracterisation de surface ayant permis l'analyse des materiaux etudies est alors decrit. Les premiers resultats experimentaux relatifs aux phenomenes qui se produisent au-dessus de l'echantillon concernent la determination de l'apparition du plasma et la visualisation de son expansion grace a une methode optique. Les resultats suivants se rapportent aux materiaux eux-memes, et notamment aux modifications physico-chimiques qu'ils ont subi a la suite du traitement laser (morphologie, topographie, porosite, durete, composition chimique. . . ). Une attention plus particuliere a ete apportee a la topographie de surface et les resultats experimentaux ont ete compares avec les predictions theoriques fournis par le modele cite precedemment.
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Attia, Rafaele. "Modifications de surfaces et intégration de MEMS pour les laboratoires sur puce." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00516528.

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Cette thèse présente diverses applications de la photopolymérisation radicalaire dans les puces microfluidiques. Dans un premier temps, nous décrirons l'importance des modifications de surfaces des puces microfluidiques afin de conférer à la surface un caractère hydrophile et neutre. Nous présenterons une modification de surface par photopolymérisation radicalaire in-situ de polyacrylamide pour des puces d'une part en PDMS, sur lequel la longévité des modifications de surface est difficile à obtenir, et d'autre part sur le COC qui étant inerte chimiquement, est difficilement modifiable. Dans une autre application la photopolymérisation sera effectuée en volume et nous permettra d'intégrer très simplement des MEMS, in-situ dans le microcanal. L'intégration de réseaux de colonnes fonctionnalisées avec des protéines sera présentée, ainsi que l'implémentation de deux capteurs de flux. Un capteur de flux basé sur l'élongation d'une structure déformable s'est montré très performant en terme de large gamme de mesures, de sensibilité et de reproductibilité. Le deuxième capteur de flux est basé sur la rotation d'un objet autour d'un axe. Sa mesure est indépendante de la viscosité du fluide malgré ses moindres performances.
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Attia, Rafaële. "Modifications de surfaces et intégration de MEMS pour les laboratoires sur puce." Paris 6, 2008. https://tel.archives-ouvertes.fr/tel-00516528.

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Cette thèse présente diverses applications de la photopolymérisation radicalaire dans les puces microfluidiques. Dans un premier temps, nous décrirons l’importance des modifications de surfaces des puces microfluidiques afin de conférer à la surface un caractère hydrophile et neutre. Nous présenterons une modification de surface par photopolymérisation radicalaire in-situ de polyacrylamide pour des puces d’une part en PDMS, sur lequel la longévité des modifications de surface est difficile à obtenir, et d’autre part sur le COC qui étant inerte chimiquement, est difficilement modifiable. Dans une autre application la photopolymérisation sera effectuée en volume et nous permettra d’intégrer très simplement des MEMS, in-situ dans le microcanal. L’intégration de réseaux de colonnes fonctionnalisées avec des protéines sera présentée, ainsi que l’implémentation de deux capteurs de flux. Un capteur de flux basé sur l’élongation d’une structure déformable s’est montré très performant en terme de large gamme de mesures, de sensibilité et de reproductibilité. Le deuxième capteur de flux est basé sur la rotation d’un objet autour d’un axe. Sa mesure est indépendante de la viscosité du fluide malgré ses moindres performances
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Aubanel, Laurent. "Etude des modifications superficielles engendrées sur un polymère par un rayonnement laser." Lyon 1, 1997. http://www.theses.fr/1997LYO10344.

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Au cours de ce travail, nous avons etudie les modifications superficielles engendrees sur un polymere par un rayonnement laser. Dans une partie bibliographique, nous avons mis en evidence les differents types de modifications obtenus a partir des traitements de surface usuels, et nous avons montre que les lasers a excimere sont les plus adequats pour traiter les polymeres, les lasers infrarouge etant en general reserves aux travaux de decoupe ou soudure des materiaux metalliques. Contrairement aux nombreuses etudes visant a graver des polymeres utilises en micro-electronique, nous avons oriente nos travaux sur la fonctionnalisation de materiaux de grande consommation (polyethylene et polypropylene) ayant un faible coefficient d'absorption dans l'ultraviolet. L'important n'est plus d'avoir une densite d'energie tres importante, mais de traiter la surface a l'aide d'un faisceau ayant une tres bonne repartition en energie. Pour une fourchette de parametres de traitement tres etroite, la mouillabilite de ces materiaux est augmentee et le calcul des composantes de l'energie de surface indiquent la formation de fonctions non dispersives. Des mesures esca mettent effectivement en evidence la presence de fonctions hydroxyle, carbonyle et carboxyle. La spectroscopie uv permet egalement de suivre les modifications de surface en fonction des parametres de traitement. Nous avons propose des mecanismes de modifications du pe et pp se produisant lors de l'interaction laser/matiere et nous avons montre que suite au traitement, les proprietes d'adherence des deux polyolefines vis a vis d'un adhesif epoxyde sont ameliorees. A partir de ces resultats, nous avons egalement mis en evidence l'amelioration des proprietes d'adherence d'un materiau composite epoxy/carbone. A faible fluence, elle est due a l'elimination d'une couche de pollution et a un legere oxydation de surface. A plus forte fluence, l'ablation de la couche superficielle de resine favorise l'accrochage mecanique de l'adhesif sur les fibres de carbone et les contraintes de cisaillement passent de 5 a 29 mpa.
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Oueini, Walid. "Caractérisation des surfaces GaSb(110) et GaSb(100) par photoémission résolue angulairement : Etude des modifications physico-chimiques de ces surfaces lors d'un dépôt d'aluminium." Montpellier 2, 1996. http://www.theses.fr/1996MON20064.

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Ce travail porte sur l'etude des proprietes intrinseques des semi-conducteurs gasb(110) et gasb(100) par photoemission resolue angulairement. Les resultats experimentaux sont compares avec les structures electroniques de volume et de surface, calculees par la methode des liaisons fortes. Nous avons trouve pour la face (110) trois etats de surface situes dans la bande de valence, ce qui laisse la surface semiconductrice. Sur la surface (100), l'une des quatre bandes de surface observees se situe au sommet de la bande de valence et peut induire un ancrage du niveau de fermi. Nous avons d'autre part, suivi l'evolution physico-chimique des surfaces de gasb lors d'un depot d'aluminium en couche mince. Par spectroscopie d'electron auger, nous avons montre que le mode de croissance sur les deux surfaces (110) et (100) se fait par succession des couches uniformes interdiffusees. Pour des epaisseurs plus elevees que 10 a, il y a formation d'ilots d'aluminium contenant une petite quantite d'antimoine
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Books on the topic "Modifications de surfaces"

1

Advanced polymer nanoparticles: Synthesis and surface modifications. Boca Raton: Taylor & Francis, 2011.

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Alicante, Raquel. Photoinduced Modifications of the Nonlinear Optical Response in Liquid Crystalline Azopolymers. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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E, Hintermann Hans, Spitz J, and European Materials Research Society. Meeting, eds. Metallurgical coatings and materials surface modifications: Proceedings of Symposium D on Metallurgical Coatings and Materials Surface Modifications of the 1990 E-MRS Spring Conference, Strasbourg, France, 29 May-1 June 1990. Amsterdam: North-Holland, 1991.

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Symposium K on Coating and Surface Modifications ro Furface Protection and Tribological Applications (1997 Strasbourg, France). Coatings and surface modifications for surface protection and triboligical applications: Proceedings of Symposium K on Coatings and Surface Modifications for Surface Protection and Tribological Applications of the 1997 ICAM/E-MRS Spring Conference, Strasbourg, France, June 16-20, 1997. Amsterdam: Elsevier, 1997.

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International Conference on Surface Modifications and Coatings (1985 Toronto, Ontario). Surface modifications and coatings: Proceedings of an international conference held in conjunction with ASM's Materials Week '85, Toronto, Ontario, Canada 14-17 October 1985. [Metals Park, Ohio]: ASM, 1986.

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Wolf, Rory A. Plastic surface modification: Surface treatment and adhesion. Munich [Germany]: Hanser, 2010.

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Wolf, Rory A. Plastic surface modification: Surface treatment and adhesion. 2nd ed. Munich: Hanser Publishers, 2016.

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Plastic surface modification: Surface treatment, decoration, and adhesion. Munich: Hanser Publishers, 2010.

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Surface modification of biomaterials: Methods, analysis and applications. Oxford: Woodhead Publishing Ltd, 2011.

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Wolf, Rory A. Plastic Surface Modification. München: Carl Hanser Verlag GmbH & Co. KG, 2010. http://dx.doi.org/10.3139/9783446430648.

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Book chapters on the topic "Modifications de surfaces"

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Wallach, Donald F. H., Ross B. Mikkelsen, and Rupert Schmidt-Ullrich. "Plasmodial Modifications of Erythrocyte Surfaces." In Ciba Foundation Symposium 80 - Adhesion and Microorganism Pathogenicity, 220–33. Chichester, UK: John Wiley & Sons, Ltd., 2008. http://dx.doi.org/10.1002/9780470720639.ch14.

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Craig, Rebecca A., and Colin P. McCoy. "Light-Triggered Anti-Infective Surfaces." In Antimicrobial Coatings and Modifications on Medical Devices, 241–66. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57494-3_10.

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Feuz, Laurent, Fredrik Höök, and Erik Reimhult. "Design of Intelligent Surface Modifications and Optimal Liquid Handling for Nanoscale Bioanalytical Sensors." In Intelligent Surfaces in Biotechnology, 71–122. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118181249.ch3.

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Bertrán, J. "Modifications of Potential Energy Surfaces by Solvation and Catalysis." In New Theoretical Concepts for Understanding Organic Reactions, 231–55. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2313-3_9.

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Boy, Jeffrey H., and Gerald P. Wirtz. "The Role of Grain Boundary Modifications in the Thermal Decomposition of Mn-Ferrites." In Surfaces and Interfaces of Ceramic Materials, 691–99. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1035-5_42.

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Aguiar, A. A., N. B. de Lima, F. J. C. Braga, W. Rossi, A. A. Couto, and R. Baldan. "Evaluation of Biomimetic Coatings on Femtosecond Laser Treated Alumina and Alumina-Zirconia Composite Surfaces." In Machining, Joining and Modifications of Advanced Materials, 141–57. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1082-8_15.

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Le Moigne, Nicolas, Belkacem Otazaghine, Stéphane Corn, Hélène Angellier-Coussy, and Anne Bergeret. "Characterization of the Fibre Modifications and Localization of the Functionalization Molecules." In Surfaces and Interfaces in Natural Fibre Reinforced Composites, 71–100. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71410-3_4.

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Tofail, S. A. M., and A. A. Gandhi. "Chapter 1. Electrical Modifications of Biomaterials' Surfaces: Beyond Hydrophobicity and Hydrophilicity." In Nanoscience & Nanotechnology Series, 3–14. Cambridge: Royal Society of Chemistry, 2011. http://dx.doi.org/10.1039/9781849733366-00003.

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Groth, Thomas, Zhen-Mei Liu, Marcus Niepel, Dieter Peschel, Kristin Kirchhof, George Altankov, and Nathalie Faucheux. "Chemical and Physical Modifications of Biomaterial Surfaces to Control Adhesion of Cells." In Advances in Regenerative Medicine: Role of Nanotechnology, and Engineering Principles, 253–84. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8790-4_13.

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Bilke, Lars, Thomas Fischer, Dmitri Naumov, Daniel Pötschke, Karsten Rink, Amir Shoarian Sattari, Patrick Schmidt, Wenqing Wang, and Keita Yoshioka. "Code Descriptions." In GeomInt–Mechanical Integrity of Host Rocks, 243–54. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61909-1_7.

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AbstractThe FFS method (see Sect. 10.1007/978-3-030-61909-1_3) was developed to simulate direct shear tests. To provide a tool for the project work and get things easier done a graphical user interface (GUI) was also created. The GUI simply calls all necessary functions by letting the user either fill form fields or choose input files from the working folder. The rock parameters and the conditions of the direct shear test with the normal stress levels and shear displacements have to be selected. If an experiment is simulated the lab results can be selected as a text file so a visual comparison is possible. The geometry has to be loaded as a point cloud or an artificial surface can be generated. With small modifications the code can do multiple executions using artificial surfaces.
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Conference papers on the topic "Modifications de surfaces"

1

Fuchs, H., and Th Schimmel. "Time-Stable Modifications of Bare Surfaces on an Atomic Scale." In Scanned probe microscopy. AIP, 1991. http://dx.doi.org/10.1063/1.41435.

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Modak, Mayank, Vishal Nirgude, Avadhesh K. Sharma, and Santosh K. Sahu. "Experimental Study on Heat Transfer Characteristics of Circular Jet Impingement Boiling on the Variety of Structured Copper Surfaces in Stagnation Zone." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60682.

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In the present work an attempt has been made to study the heat transfer characteristics of single circular jet on a variety of enhanced surfaces. In the present investigation three different copper target surfaces of various surface modifications: bare copper surface, pin fin enhancement surface and a flat surface coated with alumina porous layer. The heat transfer performance of each surface is studied in two phase boiling operation at different flow rates (3959 < Re < 7900). The comparison indicates that both the surface modification have enhanced the boiling heat transfer rates.
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Lincot, D., and J. Vedel. "Cathodic Electrochemical Modifications Of Cadmium Telluride Surfaces Formation Of Thin Cadmium Layers." In 1986 International Symposium/Innsbruck, edited by Jean Besson. SPIE, 1986. http://dx.doi.org/10.1117/12.938537.

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Simon, Vilmos V. "Optimal Tooth Modifications in Hypoid Gears." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48108.

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A method for the determination of optimal tooth modifications in hypoid gears based on improved load distribution and reduced transmission errors is presented. The modifications are introduced into the pinion tooth surface by using a cutter with bicircular profile and by changing the cutter diameter. In the optimization of tool parameters the influence of shaft misalignments of the mating members is included. As the result of these modifications a point contact of the meshed teeth surfaces appears instead of line contact; the hypoid gear pair becomes mismatched. By using the method presented in [1] the influence of tooth modifications introduced on tooth contact and transmission errors is investigated. Based on the results that was obtained the radii and position of circular tool profile arcs and the cutter diameter for pinion teeth generation were optimized. By applying the optimal tool parameters, the maximum tooth contact pressure is reduced by 16.22% and the angular position error of the driven gear by 178.72%, in regard to the hypoid gear pair with a pinion manufactured by a cutter of straight-sided profile and of diameter determined by the commonly used methods.
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Aldajah, Saud, Oyelayo O. Ajayi, and George Fenske. "Investigation of Scuffing Resistance and Tribological Performance of Laser Modified Surfaces." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64030.

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Latest development in high-power lasers made possible a wide variety of laser surface modifications. Such surface modifications include: glazing, shock peening, alloying, cladding and texturing. The main reason behind applying these treatments is to improve the tribological performance of the modified surfaces. In addition to reducing friction and wear, it is favorable to improve the scuffing resistance. Scuffing can be defined as a sudden catastrophic failure of a lubricated sliding surface characterized by a sudden rise in friction; resulting in severe surface damage through localized plastic flow. This paper investigates friction and scuffing performance of laser glazed 1080 steel and laser textured H13 stainless steel. Results showed that laser glazed surfaces reduced sliding friction under dry conditions by approximately 35% and improved wear resistance. In addition, laser glazed surfaces showed high resistance to scuffing compared to unglazed surfaces. Also, laser surface texturing technique reduced sliding friction under lubricated conditions and improved scuffing resistance.
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Simon, Vilmos V. "Influence of Tooth Modifications on Load Distribution in Face-Hobbed Spiral Bevel Gears." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47090.

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In this study a novel method for load distribution calculation is applied to investigate the influence of tooth modifications on loaded tooth contact in face-hobbed spiral bevel gears. As a result of these modifications introduced to the teeth of the pinion, the gear pair becomes mismatched, and a point contact replaces the theoretical line contact. In the applied load distribution calculation it is assumed that the point contact under load is spreading over a surface along the whole or part of the “potential” contact line, which line is made up of the points of the mating tooth surfaces in which the separations of these surfaces are minimal. The separations of contacting tooth surfaces are calculated by applying the full theory of tooth surface generation in face-hobbed spiral bevel gears. A computer program was developed to implement the formulation provided above. By using this program the influence of tooth modifications introduced by the variation in machine tool settings and in head cutter profile on load and pressure distributions, transmission errors, and fillet stresses is investigated and discussed.
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Gouaillard, A., C. Odet, and X. D. Gu. "Computing Shortest Cycles on Discrete Surfaces for Acurate Topological Modifications of Medical Image Isosurfaces." In 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference. IEEE, 2005. http://dx.doi.org/10.1109/iembs.2005.1617160.

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Ulerich, Joseph P., Lara C. Ionescu, Jianbo Chen, Winston O. Soboyejo, and Craig B. Arnold. "Modifications of Ti-6Al-4V surfaces by direct-write laser machining of linear grooves." In Lasers and Applications in Science and Engineering, edited by Craig B. Arnold, Tatsuo Okada, Michel Meunier, Andrew S. Holmes, David B. Geohegan, Frank Träger, and Jan J. Dubowski. SPIE, 2007. http://dx.doi.org/10.1117/12.713964.

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Scherpereel, Xavier, Patrice Peyre, Remy Fabbro, Glenn Lederer, and N. Celati. "Modifications of mechanical and electrochemical properties of stainless steel surfaces by laser shock processing." In Lasers and Optics in Manufacturing III, edited by Leo H. J. F. Beckmann. SPIE, 1997. http://dx.doi.org/10.1117/12.281115.

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Regalado, Isaias, and Donald R. Houser. "Profile Modifications for Minimum Static Transmission Error in Cylindrical Gears." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/ptg-5781.

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Abstract The theoretical advantage of conjugate action in involute gears is lost due to the deflection of the teeth under load and due to manufacturing and assembling errors. These factors produce instantaneous variations in the gear ratio commonly referred to as transmission error. The transmission error has been proven to have a strong relationship with the noise emitted by the transmission. In order to reduce the transmission error, the contacting surfaces of the gears are modified to compensate for the deflections and errors. These modifications may be performed in the direction of the profile, the lead or in a more general sense it may be topographical (defined point by point). This paper describes a non-iterative procedure for the calculation of the modifications for minimum transmission error based on a predefined load distribution. The results presented agree with the common practice for spur gears of tip relief in the direction of the profile and crowning in the direction of the lead, but for helical gears the need for a more complicated modification is observed.
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Reports on the topic "Modifications de surfaces"

1

Cabibil, H., J. E. Houston, T. M. Mayer, and G. F. Franklin. Electric field effects on the nanometer-level surface modification of Au(111) surfaces. Office of Scientific and Technical Information (OSTI), June 1998. http://dx.doi.org/10.2172/663562.

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Crooks, R. M., T. S. Corbitt, C. B. Ross, M. J. Hampden-Smith, and J. K. Schoer. Scanning Probe Surface Modification. Fort Belvoir, VA: Defense Technical Information Center, November 1993. http://dx.doi.org/10.21236/ada273178.

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Pavia Sanders, Adriana, and Greg O'Bryan. Covalent Surface Modifications of Carbon Nanotubes. Office of Scientific and Technical Information (OSTI), July 2017. http://dx.doi.org/10.2172/1373648.

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Okoh, J. M., J. Pinion, and S. Thiensatit. Gaseous phase coal surface modification. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/5129161.

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Blau, Peter Julian, Jun Qu, Yan Zhou, Kevin M. Cooley, DONALD L. ERDMAN, III, and Stephen M. Hsu. Friction Reduction through Surface Modification. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1162088.

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Smith, G., T. Wiltowski, T. Wiltowska, E. Myszka, and Keji Zhao. Modification of coal surfaces with methyl radicals. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/7183042.

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Brown, I. G., X. Godechot, and K. M. Yu. Novel metal ion surface modification technique. Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/5966951.

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Mark Spitzer. Reduction of Glass Surface Reflectance by Ion Beam Surface Modification. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1008857.

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Le, H. K., D. M. Horne, and R. S. Silberglitt. Energy conservation potential of surface modification technologies. Office of Scientific and Technical Information (OSTI), September 1985. http://dx.doi.org/10.2172/5164676.

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Natishan, P. M., F. J. Martin, E. J. Lemieux, T. M. Newbauer, R. Rayne, and R. A. Bayles. Carbon Surface Modification for Enhanced Corrosion Resistance. Fort Belvoir, VA: Defense Technical Information Center, January 2008. http://dx.doi.org/10.21236/ada517866.

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