Articoli di riviste: "Composites de ciment – Surfaces"

1

CHOUGNET, Alice. "Matériaux composites ciment/polymère". Revue Européenne de Génie Civil 10, n. 8 (settembre 2006): 998. http://dx.doi.org/10.1080/17747120.2006.9692879.

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Maciel, Lucas Campagnaro, Amanda Pádua Proeza, Hélyda Coelho Guimarães Balbino, Marcela Moráo Corteletti, Ricardo Huver De Jesus e Laís Regiane da Silva Concílio. "Influence of Surface Treatment and Resin Cements on the Bond Strength between the Y-TZP Zirconia and Composite Resin Interface". Journal of Health Sciences 21, n. 5 (20 dicembre 2019): 477–82. http://dx.doi.org/10.17921/2447-8938.2019v21n5p477-482.

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Abstract (sommario):

AbstractThe evolution of dental materials and the improvement of ceramic systems stimulated the increased use of Y-TZP zirconia-based ceramics. Despite the excellent mechanical performance, this material has low adhesion potential. The objective of this work was to evaluate the surface treatments and resin cements influence on bond strength between Y-TZP zirconia and composite resin interface. A total of 60 blocks of Y-TZP zirconia (3x8x8mm) were prepared and divided into 3 groups according to the surface treatments: (C) control - extra fine diamond bur, (J) sandblasting with Al2O3 and (JP) sandblasting with Al2O3 + ceramic primer. Each group was subdivided into two groups according to type of resin cement used for cementing composite resin discs (2mm thick x 5mm diameter): self-adhesive and conventional (n=10). The samples were stored in distilled water for 24 hours at 37±1°C in a incubator and subsequently submitted to the shear bond test to determine the bond strength (RU). There was no significant difference in RU among the surface treatments when using conventional resin cement. For the self-adhesive resin cement, Al2O3 blasting and Al2O3 + primer blasting increased the RU but did not present significant differences between them (p<0.05). Comparing the cements, it was observed that regardless of the surface treatment, the highest values were for the self-adhesive resin cement (p<0.05). Application of the primer after blasting with Al2O3 did not increase RU. Keywords: Dental Prosthesis. Ceramics. Dental cements. Shear Strength. ResumoA evolução dos materiais odontológicos e o aprimoramento dos sistemas cerâmicos impulsionaram o aumento da utilização da cerâmica a base de zircônia Y-TZP. Apesar do excelente desempenho mecânico, este material apresenta baixo potencial de adesão. O objetivo deste trabalho foi avaliar a influência dos tratamentos de superfícies e dos cimentos resinosos na resistência de união entre a interface zircônia Y-TZP e resina composta. Foram confeccionados 60 blocos de zircônia Y-TZP (3x8x8 mm) e divididos em 03 grupos de acordo com os tratamentos de superfícies que receberam: (C) controle - ponta diamantada extrafina, (J) jateamento com Al2O3 e (JP) jateamento com Al2O3 + primer cerâmico. Cada grupo foi subdividido em dois novos grupos de acordo com tipo de cimento resinoso utilizado para cimentação de discos de resina composta (2mm de espessura x 5mm de diâmetro): autoadesivo e resinoso convencional (n=10). As amostras foram armazenadas em água destilada por 24 horas a 37±1°C em estufa e posteriormente submetidas ao teste de cisalhamento para averiguar a resistência de união (RU). Não houve diferença significativa na RU entre os tratamentos de superfície quando utilizado o cimento resinoso convencional. Para o cimento resinoso autoadesivo o jateamento com Al2O3 e o jateamento de Al2O3 + primer aumentaram a RU porém não apresentaram diferenças significativas entre si (p<0,05). Comparando os cimentos observou-se que, independente do tratamento de superfície, os maiores valores foram para o cimento resinoso autoadesivo (p<0,05). A aplicação do primer após o jateamento com Al2O3 não proporcionou aumento da RU. Palavras-chave: Prótese Dentária. Cerâmica. Cimentos Dentários. Resistência ao Cisalhamento.

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Houget, V., J. Ambroise e J. Pera. "Propriétés mécaniques de composites ciment-fibres organiques". Materials and Structures 28, n. 4 (maggio 1995): 220–29. http://dx.doi.org/10.1007/bf02473252.

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Juarez, Cesar, Gerardo Fajardo e Pedro Valdez. "Caractérisation microstructurale des fibres naturelles pour des matériaux composites à base de ciment". Canadian Journal of Civil Engineering 36, n. 3 (marzo 2009): 449–62. http://dx.doi.org/10.1139/l09-009.

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Le comportement mécanique des bétons renforcés de fibres naturelles dépend principalement de l’adhérence entre la fibre et la matrice de ciment. Cette adhérence a aussi une certaine influence sur le type d’endommagement de ces matériaux. Cette recherche a été menée sur des fibres naturelles de lecheguilla (Agave lecheguilla). Des essais chimiques, physiques et mécaniques tels que la détermination de la composition chimique, la morphologie, la porosité, l’absorption d’eau et les résistances à la traction et à la flexion ont été réalisés en utilisant ces fibres naturelles. Des observations à l’interface fibre–matrice de ciment ont aussi été effectuées à l’aide du stéréoscope pour évaluer l’effet du milieu alcalin et de différents rapports eau/ciment (E/C) sur la performance de mortier fibré. On a constaté que la résistance mécanique à la traction et à la flexion du matériau composite augmente, d’une part, avec l’augmentation de la longueur et, d’autre part, avec la diminution du volume de fibres utilisé. Le principal type de défaillance observée est l’arrachement des fibres. De plus, l’adhérence entre les fibres et la matrice de ciment est modifiée par les changements volumétriques et l’absorption d’eau relativement élevée. Néanmoins, cette adhérence peut être substantiellement améliorée en faisant un traitement superficiel des fibres à l’aide de solutions chimiques, comme le xylène, et en utilisant des faibles rapports E/C.

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Bilba, Ketty, e Marie-Ange Arsène. "Etude de matériaux composites fibres de dictame/ciment". Revue des composites et des matériaux avancés 17, n. 3 (21 dicembre 2007): 327–50. http://dx.doi.org/10.3166/rcma.17.327-350.

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Serifou, Mamery Adama, Obre Sery Paul Jolissaint, Bleh Raoul Kouassi e Emeruwa Edjikémé. "Analyse physico-mécanique d’un composite paille de riz/ciment". Matériaux & Techniques 108, n. 2 (2020): 208. http://dx.doi.org/10.1051/mattech/2020024.

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En raison des nombreux avantages qu’offrent les fibres végétales, elles sont de plus en plus utilisées pour la production de matériaux composites notamment dans le domaine de la construction. Le riz est la céréale la plus consommée dans le monde pour l’alimentation humaine. Sa production engendre des quantités importantes de paille qui sont peu ou pas valorisées d’où le besoin d’en faire un renfort dans les matériaux cimentaires. À travers cette étude, des composites de pailles de riz (PDR) / ciment ont été élaborés avec différentes teneurs en paille. Des essais mécaniques et physiques ont été réalisés à différents âges pour en évaluer les performances. Il en ressort que l’incorporation de 1 à 5 % de PDR induit une réduction des propriétés physiques et mécaniques des composites et provoquent un retard de prise du ciment. Cela a pour cause la grande absorption d’eau des pailles et leur faible adhésion avec la matrice cimentaire. Par ailleurs on assiste à l’allègement des composites grâce à l’introduction d’air occlus. Cette étude constitue la première étape de toute une série. Elle a permis de comprendre le comportement des PDR vis-à-vis du ciment. Les perspectives visent l’optimisation des propriétés mécaniques et physiques du matériau à travers l’incorporation de granulats.

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Puiatti, Daniel, Michel Lino, Pierre Cochet e Stéphane Bonelli. "Barrages en Sol Cimenté : présentation du nouveau Bulletin 195 de la CIGB". Revue Française de Géotechnique, n. 178 (2024): 9. http://dx.doi.org/10.1051/geotech/2024012.

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Dans le Bulletin 195 Barrages en Sol Cimenté, récemment publié par la Commission Internationale des Grands Barrages (CIGB), le terme « Sol Cimenté » désigne tout sol lié, que ce soit suite à un traitement à la chaux, au ciment, ou à la chaux en association avec le ciment, le cas échéant avec addition de composants pouzzolaniques. Le bulletin fait aussi mention des liants hydrauliques routiers. En Europe, où ces produits sont normalisés et contrôlés, ils peuvent avantageusement remplacer les ciments. Le traitement des sols est une technique ancienne et éprouvée qui a connu au cours des soixante dernières années un développement spectaculaire, en particulier dans le domaine des infrastructures de transport. Des exemples d’applications existent également dans le domaine des ouvrages hydrauliques, ce qui a conduit la CIGB à publier le Bulletin 54, Sol-ciment pour barrages en remblai (1986), consacré à l’utilisation de matériaux granulaires traités au ciment pour la protection des talus amont des barrages en terre. Depuis les années 1980, la technique a considérablement évolué grâce aux progrès de la technologie d’une part, et à une utilisation plus rationnelle de la chaux aérienne calcique d’autre part. En outre, d’importants programmes de recherche et des retours d’expériences positifs ont permis de mieux explorer et caractériser les performances des sols traités et d’en tirer un meilleur profit. Le nouveau Bulletin 195 couvre l’utilisation des sols cimentés dans la réalisation d’ouvrages hydrauliques. S’il s’appuie sur le Bulletin 54 exclusivement consacré au ciment, il le complète avec l’utilisation de la chaux aérienne calcique, permettant ainsi d’élargir le champ d’application de la technique au traitement des sols limono-argileux. S’agissant de la valorisation de matériaux naturels, donc non élaborés, il insiste particulièrement sur l’importance des études préalables : reconnaissance des gisements et études en laboratoire. Profitant de l’expérience acquise dans les infrastructures de transport, il étend largement l’utilisation des sols traités à d’autres applications que les protections de talus amont, notamment aux barrages homogènes de hauteur moyenne (jusqu’à 30 m de haut), aux barrages zonés et aux digues. Il fournit des recommandations utiles pour la conception, la construction et la réparation des barrages et des digues faisant usage de sols cimentés.

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Chadfeau, Calypso, Sayed Hashim Mohseni, Safiullah Omary, Vincent Steiner, Essia Belhaj, Christophe Fond e Françoise Feugeas. "Influence d’un bioadjuvant sur l’adhésion du ciment sur parois coffrantes et évaluation de l’effet de la rugosité des parois coffrantes". Matériaux & Techniques 108, n. 3 (2020): 301. http://dx.doi.org/10.1051/mattech/2020031.

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L’objectif de ce travail est de comprendre comment l’adhésion entre le ciment et le coffrage est influencée par la morphologie de la surface du coffrage et l’ajout d’un bioadjuvant. L’ancrage mécanique de la pâte cimentaire est en effet lié à la rugosité de surface du coffrage. Une procédure de caractérisation morphologique des surfaces en contact, coffrage et ciment, est développée par microscopie interférométrique. Elle permet de retenir une échelle d’observation pour laquelle les valeurs des paramètres d’états de surface Sa, Sq, Sdr, Vvc et Vvv, sont représentatifs de la morphologie de surface. Trois états de surface de coffrage différents sont obtenus par polissage et sont caractérisés à l’échelle d’observation. Les paramètres de surfaces sont corrélés avec les performances au décoffrage pour ces trois états de surface. L’action d’un bioadjuvant sur les phénomènes d’adhésion tant au niveau des efforts de décoffrage que de la qualité de parement est évaluée pour trois taux d’incorporation de bioadjuvant. Les résultats mettent en évidence qu’un degré de polissage spécifique combiné à l’utilisation d’un taux de bioadjuvant minimum dans la pâte cimentaire permettent d’atteindre des performances au décoffrage équivalentes à celles obtenues avec un agent décoffrant classique.

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Rippe, MP, R. Amaral, FS Oliveira, PF Cesar, R. Scotti, LF Valandro e MA Bottino. "Evaluation of Tensile Retention of Y-TZP Crowns Cemented on Resin Composite Cores: Effect of the Cement and Y-TZP Surface Conditioning". Operative Dentistry 40, n. 1 (1 gennaio 2015): E1—E10. http://dx.doi.org/10.2341/13-310-l.

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SUMMARY This study evaluated the effect of the cement type (adhesive resin, self-adhesive, glass ionomer, and zinc phosphate) on the retention of crowns made of yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP). Therefore, 108 freshly extracted molars were embedded in acrylic resin, perpendicular to their long axis, and prepared for full crowns: the crown preparations were removed and reconstructed using composite resin plus fiber posts with dimensions identical to the prepared dentin. The preparations were impressed using addition silicone, and Y-TZP copings were produced, which presented a special setup for the tensile testing. Cementation was performed with two adhesive resin cements (Multilink Automix, Ivoclar-Vivadent; RelyX ARC, 3M ESPE, St Paul, MN, USA), one self-adhesive resin cement (RelyX U100, 3M ESPE), one glass ionomer based cement (RelyX Luting, 3M ESPE), and one zinc phosphate cement (Cimento de Zinco, SS White, Rio de Janeiro, Brazil). For the resin cement groups, the inner surfaces of the crowns were subjected to three surface treatments: cleaning with isopropyl alcohol, tribochemical silica coating, or application of a thin low-fusing glass porcelain layer plus silanization. After 24 hours, all groups were subjected to thermocycling (6000 cycles) and included in a special device for tensile testing in a universal testing machine to test the retention of the infrastructure. After testing, the failure modes of all samples were analyzed under a stereomicroscope. The Kruskal-Wallis test showed that the surface treatment and cement type (α=0.05) affected the tensile retention results. The Multilink cement presented the highest tensile retention values, but that result was not statistically different from RelyX ARC. The surface treatment was statistically relevant only for the Multilink cement. The cement choice was shown to be more important than the crown surface treatment for cementation of a Y-TZP crown to a composite resin substrate.

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Patouillard, Sébastien, Lucile Saussaye, Alain Le Kouby e Loïc Gervais. "Écrans d’étanchéité dans les levées de la Loire : retour d’expérience sur 10 ans de « deep soil mixing »". Revue Française de Géotechnique, n. 178 (2024): 8. http://dx.doi.org/10.1051/geotech/2024011.

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En 2013, la DREAL Centre-Val de Loire a présenté les différentes techniques de renforcement des levées de Loire utilisées depuis la seconde moitié du XX siècle, ainsi que les perspectives attendues de chantiers expérimentaux d’écrans étanches en corps de digues. Ces chantiers ont permis la comparaison de plusieurs techniques de « soil mixing » (2012–2013). En 2019, un premier bilan de ce suivi expérimental à 5 ans ainsi que le retour d’expérience de plusieurs chantiers d’écrans étanches sur les levées de Loire ont été communiqués et présentés. Ces chantiers ont conduit à faire évoluer les approches de conception et de réalisation en exploitant la connaissance des sols (de la digue et de ses fondations) et de la nappe alluviale circulant dans les couches perméables du sous-sol. Depuis lors, les renforcements de digues conduits sur la Loire avec cette technique se sont poursuivis et représentent plus de 32 km. Dans le cadre de travaux de recherche sur la thématique « Vulnérabilité des digues au changement climatique des digues de Loire », un écran a été instrumenté à Montlouis-sur-Loire, en Indre-et-Loire, lors de sa réalisation. L’objet du présent article est de présenter un état des connaissances sur la base des résultats à 10 ans du suivi expérimental (pérennité, rendement, contraintes de mise en œuvre et moyens de contrôle) et de compléter le retour d’expérience sur les chantiers de plus grande ampleur qui ont permis d’adapter la technique (liant ciment ou chaux-ciment, apport en eau, critères de malaxage). L’article présente les conditions dans lesquelles la technique est adaptée mais aussi pointe les limites de son application (types de sols, profondeur, dimension du chantier). Il décrit l’instrumentation à Montlouis-sur-Loire de la levée de Tours Loire amont permettant de mesurer la température et la teneur en eau volumique du matériau sol-ciment en insistant sur deux points : la validation de la méthode d’exécution au moment de la réalisation de l’écran et le choix d’une procédure de suivi pour vérifier la pérennité de ses caractéristiques mécaniques et hydrauliques. L’instrumentation est complétée par 2 piézomètres et une station météorologique. De plus, pour le suivi à long terme, des matériaux ont été prélevés pour tester leur perméabilité. Un carottage dans l’écran a également été effectué 2 ans après sa réalisation et soumis aux mêmes types d’essais.

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Bachiorrini, A., e M. Murat. "Evolution microstructurale des composites du systeme ciment alumineux-granulat calcaire. I. Mode de propagation de la fissure". Cement and Concrete Research 17, n. 2 (marzo 1987): 242–48. http://dx.doi.org/10.1016/0008-8846(87)90107-4.

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Gladunova, O. I., Yu E. Fedorova, O. V. Astashkina e A. A. Lysenko. "Composites with Hydrophobic Surfaces". Fibre Chemistry 47, n. 4 (novembre 2015): 317–19. http://dx.doi.org/10.1007/s10692-016-9686-5.

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Bachiorrini, A., e M. Murat. "Evolution microstructurale des composites du systeme ciment alumineux-granulat calcaire. II. Influence sur la porosite et les resistances mecaniques". Cement and Concrete Research 17, n. 3 (maggio 1987): 397–403. http://dx.doi.org/10.1016/0008-8846(87)90003-2.

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KOUTOUS, Ahmed, Guillaume LACOMBE e Ali HAMMANI. "Les « notfias » du Maroc : une technique ancestrale de collecte et stockage des eaux pluviales". Techniques Sciences Méthodes 7-8 (21 agosto 2023): 87–95. http://dx.doi.org/10.36904/tsm/202307087.

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Exposées au problème de la rareté de l’eau, les populations des régions arides et semi-arides ont développé des techniques traditionnelles de collecte et de stockage des eaux pluviales pour diverses utilisations en périodes sèches. Au Maroc, les réservoirs traditionnels connus sous le nom de « notfia » figurent parmi les techniques les plus fréquemment rencontrées. Leur usage est exclusivement domestique. L’irrégularité croissante des précipitations en partie liée au changement climatique incite à repenser ce type d’aménagement et à l’améliorer dans une perspective d’utilisation pour l’irrigation des cultures. La plupart des travaux de recherche réalisés sur ce sujet se limitent généralement à une description de leur fonctionnement hydraulique. Cet article a pour originalité de s’intéresser à la conception structurelle et aux procédés de construction de ces « notfias » en vue d’étudier la possibilité de leur usage en irrigation. L’état de l’art qui a été réalisé dans ce but révèle une tendance au remplacement des matériaux locaux et des techniques de constructions durables par des procédés de construction en béton conventionnel de ciment et en béton armé. En plus de son impact négatif sur l’environnement, l’utilisation de ciment n’est pas toujours économiquement rentable par rapport aux techniques traditionnelles. Cet article propose, comme perspectives de recherche, de valoriser les méthodes anciennes de construction de ces ouvrages, généralement moins onéreuses et plus durables, tout en adaptant leur conception, notamment les propriétés de l’impluvium (surface, pente, texture) et du réservoir (capacité de stockage, possibilité de vidange gravitaire sans coût énergétique) pour un usage agricole. Le potentiel et les limites de valorisation agricole de l’eau stockée devraient également être explorés (surfaces et cultures irrigables en fonction de l’eau disponible et de sa variabilité interannuelle et saisonnière).

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French, M. A., e G. Pritchard. "The fracture surfaces of hybrid fibre composites". Composites Science and Technology 47, n. 3 (gennaio 1993): 217–23. http://dx.doi.org/10.1016/0266-3538(93)90030-k.

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Kuang, Da, Liye Xu, Lei Liu, Wenbin Hu e Yating Wu. "Graphene–nickel composites". Applied Surface Science 273 (maggio 2013): 484–90. http://dx.doi.org/10.1016/j.apsusc.2013.02.066.

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Luo, S. Y., e Y. S. Liao. "Observations on Fracture Surfaces of Sintered Diamond Composites". Key Engineering Materials 108-110 (luglio 1995): 449–50. http://dx.doi.org/10.4028/www.scientific.net/kem.108-110.449.

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Nosonovsky, Michael, Vahid Hejazi, Aniedi E. Nyong e Pradeep K. Rohatgi. "Metal Matrix Composites for Sustainable Lotus-Effect Surfaces". Langmuir 27, n. 23 (6 dicembre 2011): 14419–24. http://dx.doi.org/10.1021/la201656y.

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Lees, W. A. "Bonding of composites: large structures and unprepared surfaces". Construction and Building Materials 5, n. 4 (dicembre 1991): 177–87. http://dx.doi.org/10.1016/0950-0618(91)90046-n.

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Friedrich, K., R. Reinicke e Z. Zhang. "Wear of polymer composites". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 216, n. 6 (1 giugno 2002): 415–26. http://dx.doi.org/10.1243/135065002762355334.

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The use of polymers and polymer composites in various tribological situations has become state of the art. Nevertheless, new developments are still under way to explore new fields of application for these materials and to tailor their properties for more extreme loading conditions. Some of these developments can be followed when searching through the 56 references given at the end of this review. The present overview describes, in particular, some of the authors' approaches in designing polymeric composites in order to operate under low friction and low wear against steel counterparts. Special emphasis is focused on thermoplastics and thermosets reinforced with special fillers (including nanoparticles). An attempt is made to predict their wear properties and to carry out systematic parameters studies by the use of artificial neural networks. Further information will be given on the fibre orientation dependence of wear of continuous carbon fibre-polymer matrix composites, and on attempts to predict their load-bearing capacity and related wear mechanisms by the use of finite elements. In addition, some new steps towards the development of functionally graded tribomaterials are illustrated.

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Friedrich, Klaus, e Jens Schuster. "Polymer Matrix Composites". Tribology International 29, n. 1 (febbraio 1996): 91. http://dx.doi.org/10.1016/0301-679x(96)90013-4.

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Bokobza, Liliane. "Elastomeric composites. I. Silicone composites". Journal of Applied Polymer Science 93, n. 5 (2004): 2095–104. http://dx.doi.org/10.1002/app.20684.

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Karapanagiotis, Ioannis, e Panagiotis Manoudis. "Superhydrophobic surfaces". Journal of the Mechanical Behaviour of Materials 21, n. 1-2 (1 novembre 2012): 21–32. http://dx.doi.org/10.1515/jmbm-2012-0022.

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AbstractSuperhydrophobicity – also known as water repellency – has recently attracted considerable attention because of its numerous potential applications. However, the fundamental concepts and equations describing the wettability of superhydrophobic surfaces have been known since the 1940s. These concepts are reviewed and discussed in the present feature article in light of the recent developments. Furthermore, the potential use of water-repellent siloxane-nanoparticle composites for surface protection and consolidation of stones and mortars used in outdoor objects of cultural heritage is investigated. Finally, it is shown that the wettability of the composite surfaces can be predicted by the Cassie-Baxter equation.

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Tarodiya, Rahul, e Avi Levy. "Erosion of polymers and polymer composites surfaces by particles". Advanced Powder Technology 32, n. 8 (agosto 2021): 3149–59. http://dx.doi.org/10.1016/j.apt.2021.07.005.

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Salman, K. D., e Z. M. Razlan. "Polyamide Nanofibers Reinforced Titanium Nanoparticles Composites for hydrophobic surfaces". IOP Conference Series: Materials Science and Engineering 429 (9 novembre 2018): 012003. http://dx.doi.org/10.1088/1757-899x/429/1/012003.

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Syromyatnikova, A., M. Safonova e A. Fedotov. "A research of the working surfaces of abrasive composites". World Journal of Engineering 9, n. 2 (giugno 2012): 147–50. http://dx.doi.org/10.1260/1708-5284.9.2.147.

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Chou, C.-T., U. Gaur e B. Miller. "Evaluation of Fracture Surfaces in Carbon Fiber/Epoxy Composites". Journal of Adhesion 40, n. 2-4 (maggio 1993): 245–56. http://dx.doi.org/10.1080/00218469308031287.

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Rout, J., M. Misra, A. K. Mohanty, S. K. Nayak e S. S. Tripathy. "SEM Observations of the Fractured Surfaces of Coir Composites". Journal of Reinforced Plastics and Composites 22, n. 12 (agosto 2003): 1083–100. http://dx.doi.org/10.1177/0731684403027377.

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Sgriccia, N., M. C. Hawley e M. Misra. "Characterization of natural fiber surfaces and natural fiber composites". Composites Part A: Applied Science and Manufacturing 39, n. 10 (ottobre 2008): 1632–37. http://dx.doi.org/10.1016/j.compositesa.2008.07.007.

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Azizi, Reza, Christian F. Niordson e Brian Nyvang Legarth. "Size-effects on yield surfaces for micro reinforced composites". International Journal of Plasticity 27, n. 11 (novembre 2011): 1817–32. http://dx.doi.org/10.1016/j.ijplas.2011.05.006.

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31

Song, Hyon Min, Peide D. Ye e Albena Ivanisevic. "Elastomeric Nanoparticle Composites Covalently Bound to Al2O3/GaAs Surfaces". Langmuir 23, n. 18 (agosto 2007): 9472–80. http://dx.doi.org/10.1021/la700979r.

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32

Vidholdová, Zuzana, Ján Iždinský, Ladislav Reinprecht e Jana Krokošová. "Activity of Bacteria and Moulds on Surfaces of Commercial Wooden Composites". Materials Science Forum 818 (maggio 2015): 190–93. http://dx.doi.org/10.4028/www.scientific.net/msf.818.190.

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Abstract (sommario):

Bacteria and mould exposures are reported to be associated with allergies, respiratory symptoms and asthma. Wood products with antimicrobial surface would reduce the risk of spreading microbial infections especially in healthcare facilities and public buildings. In future is perspective of their use.In this study, twenty five wooden composites commercially produced in Slovakia having different surfaces were tested both against moulds – microscopic fungiAspergillus nigerandPenicilliumspp., and also against bacteriaEscherichia coliandStaphylococcus aureus. These organisms are commonly applied as test microbes in laboratory experiments. On the basis of bacteria and mould’s growth on the surfaces of used wooden composites, the tested surfaces have been divided to three groups: (1) wooden composites with high resistant surface, (2) wooden composites with medium resistance surface, (3) and wooden composites with not resistant surface.

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Xiao, Peng, e Zhi Kang Fan. "Vacuum Breakdown Behavior of CuWCr Composites". Materials Science Forum 569 (gennaio 2008): 125–28. http://dx.doi.org/10.4028/www.scientific.net/msf.569.125.

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The Cu20W70Cr10 composites were fabricated by two methods which are the conventional powder metallurgy, and mechanical alloying to prepare WCr compound powders, followed by sintering and infiltration. The erosion behavior of CuWCr composites under breakdown was investigated. The surfaces of the composites before and after erosion and the mechanism of arc erosion were studied by scanning electron microscopy. The results show that the CuWCr composites prepared by mechanical alloying have superfine microstructure, uniform composition and high density, thus result in good characteristics of diffusing arcs and arc eroding endurance. Arc erosion zones are dispersive and uniform on the surfaces with some flat eroding pits. The Cu20W70Cr10 composites have excellent electrical properties such as high breakdown voltage, low chopping current and long arc life.

34

Chang, Shou-Yi, Chia-Jung Hsu, Cher-Hao Hsu e Su-Jien Lin. "Investigation on the arc erosion behavior of new silver matrix composites: Part I. Reinforced by particles". Journal of Materials Research 18, n. 4 (aprile 2003): 804–16. http://dx.doi.org/10.1557/jmr.2003.0111.

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Static-gap, single-spark tests were used to investigate the arc erosion behavior of newly developed silicon carbide and alumina particle reinforced silver matrix composites (SiCp/Ag, Al2O3p/Ag). Craters and hills exist on the surfaces of eroded silver matrix composites, and their depths and sizes decrease as the particle content increases and the particle size decreases. Obvious melting, flow, severe splash of molten silver, and the segregation of particles are present on the surfaces of eroded composites containing low volume percents of large particles. Easier silver flow results in smooth surfaces and reduces the total surface areas of the eroded composites containing large particles. The flow and splash of silver decreased with increasing particle content and decreasing particle size, exhibiting a better erosion resistance to single-spark tests. The static-gap, single-spark erosion behavior of silver matrix composites is dominated by the flow and splash of molten composites. A high viscosity of the liquids provides the composites a good arc erosion resistance.

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Evon, Philippe. "Special Issue “Natural Fiber Based Composites”". Coatings 11, n. 9 (27 agosto 2021): 1031. http://dx.doi.org/10.3390/coatings11091031.

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Guicciardi, Stefano, Laura Silvestroni, Cesare Melandri, Diletta Sciti e Giuseppe Pezzotti. "Nanoindentation characterisation of HfC-based composites". International Journal of Surface Science and Engineering 1, n. 2/3 (2007): 198. http://dx.doi.org/10.1504/ijsurfse.2007.015025.

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37

Belo, Samuel, Francisca Sousa-Cardoso, Rita Teixeira-Santos, Luciana C. Gomes, Rita Vieira, Jelmer Sjollema, Olívia S. G. P. Soares e Filipe J. Mergulhão. "Production and Characterization of Graphene Oxide Surfaces against Uropathogens". Coatings 13, n. 8 (28 luglio 2023): 1324. http://dx.doi.org/10.3390/coatings13081324.

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Graphene and its functionalized derivatives have been increasingly applied in the biomedical field, particularly in the production of antimicrobial and anti-adhesive surfaces. This study aimed to evaluate the performance of graphene oxide (GO)/polydimethylsiloxane (PDMS) composites against Staphylococcus aureus and Pseudomonas aeruginosa biofilms. GO/PDMS composites containing different GO loadings (1, 3, and 5 wt.%) were synthesized and characterized regarding their morphology, roughness, and hydrophobicity, and tested for their ability to inhibit biofilm formation under conditions that mimic urinary tract environments. Biofilm formation was assessed by determining the number of total and culturable cells. Additionally, the antibacterial mechanisms of action of GO were investigated for the tested uropathogens. Results indicated that the surfaces containing GO had greater roughness and increased hydrophobicity than PDMS. Biofilm analysis showed that the 1 wt.% GO/PDMS composite was the most effective in reducing S. aureus biofilm formation. In opposition, P. aeruginosa biofilms were not inhibited by any of the synthesized composites. Furthermore, 1% (w/v) GO increased the membrane permeability, metabolic activity, and endogenous reactive oxygen species (ROS) synthesis in S. aureus. Altogether, these results suggest that GO/PDMS composites are promising materials for application in urinary catheters, although further investigation is required.

38

Di, Ming Wei, e Yang Liu. "Stability and Ageing of Plasma Treated Wood/Polyethylene Composites Surfaces". Advanced Materials Research 150-151 (ottobre 2010): 829–33. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.829.

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Wood/Polyethylene (PE) composites were modified by air glow discharge plasma. The modified composites surface were characterized by contact angle measurements, attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that the surface wettability was improved, -OH, C-O and C=O bond were introduced on the surface, the oxygen element content increased and the shear bonding strength increased after plasma treatment. However, in the period of aging, the modified surface was unstable and exhibited a hydrophobic recovery, meanwhile the oxygen-containing functional groups reduced, O/C ratio increased and the shear bonding strength decreased gradually.

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Calame, Jeffrey, e Morag Garven. "Dielectric permittivity simulations of layered composites with rough interfacial surfaces". IEEE Transactions on Dielectrics and Electrical Insulation 14, n. 2 (aprile 2007): 287–95. http://dx.doi.org/10.1109/tdei.2007.344605.

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40

Cao, Zheng, Yanchao Hu, Ying Lu, Yinglin Xiong, An Zhou, Cheng Zhang, Dun Wu e Chunlin Liu. "Laser-induced blackening on surfaces of thermoplastic polyurethane/BiOCl composites". Polymer Degradation and Stability 141 (luglio 2017): 33–40. http://dx.doi.org/10.1016/j.polymdegradstab.2017.05.004.

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41

Miguez Suarez, João Carlos, Fernanda M. B. Coutinho e Thaís H. Sydenstricker. "SEM studies of tensile fracture surfaces of polypropylene—sawdust composites". Polymer Testing 22, n. 7 (ottobre 2003): 819–24. http://dx.doi.org/10.1016/s0142-9418(03)00017-5.

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42

Gadalla, A. M., e N. F. Petrofes. "SURFACES OF ADVANCED CERAMIC COMPOSITES FORMED BY ELECTRICAL DISCHARGE MACHINING". Materials and Manufacturing Processes 5, n. 2 (gennaio 1990): 253–71. http://dx.doi.org/10.1080/10426919008953246.

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43

Dinu, Cerasela Zoica, Guangyu Zhu, Shyam Sundhar Bale, Gaurav Anand, Philippa J. Reeder, Karl Sanford, Gregg Whited, Ravi S. Kane e Jonathan S. Dordick. "Enzyme-Based Nanoscale Composites for Use as Active Decontamination Surfaces". Advanced Functional Materials 20, n. 3 (8 febbraio 2010): 392–98. http://dx.doi.org/10.1002/adfm.200901388.

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44

Watazu, Akira, Kay Teraoka, Hirofumi Kido, Kenzo Morinaga, Kae Okamatsu, Yoshiyuki Nagashima, Masaro Matsuura e Naobumi Saito. "Formation of Titanium Oxide/Titanium/Plastic Composites". Key Engineering Materials 361-363 (novembre 2007): 487–90. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.487.

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Abstract (sommario):

Titanium oxide/ titanium/ plastic composite implants were formed by coating commercially pure titanium thin films on the surfaces of plastic cylinders by DC magnetron sputtering method. The composite is uniformly formed and the surface of the composite implant is smooth. The implants in rat tibias were not broken and the films on the surfaces of the samples did not decompose. The samples with bone were able to cut by diamond knife and observations between bone and titanium oxide on titanium by TEM succeeded. Therefore, the composite is useful for implants or observations the interactions between titanium oxide and bone in detail.

45

Абразумов, В. В., e Б. Л. Спирин. "Features of mechanical processing of wood composites". Informacionno-technologicheskij vestnik, n. 2(28) (17 giugno 2021): 148–55. http://dx.doi.org/10.21499/2409-1650-2021-28-2-148-155.

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В работе рассмотрены особенности резания древесных композиционных материалов в сравнении с обработкой металлических сплавов. Рассмотрены вопросы влияния режимов резания на температуру передней и задней поверхностей инструмента при цилиндрическом фрезеровании цементно-стружечных плит. Представлены графические зависимости распределения температур на контактных поверхностях резца. The paper considers the features of cutting wood composite materials in comparison with the processing of metal alloys. The questions of the influence of cutting modes on the temperature of the front and back surfaces of the tool during cylindrical milling of cement-chipboard are considered. Graphical dependences of the temperature distribution on the contact surfaces of the cutter are presented.

46

Wang, Da Zhen, Pei Feng Feng e Ling You. "Effect of Reinforcements on the Ultraprecision Performance of SiC Reinforced Aluminium Matrix Composites". Advanced Materials Research 154-155 (ottobre 2010): 1342–47. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1342.

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The experiments on ultraprecision turning of SiC reinforced aluminium composites have been done by using polycrystalloid diamond (PCD) tool with the three-dimensional cutting forces measured with a Kistler dynamometer, the quality of the machined surfaces was examined under Atom Force Microscope (AFM) and Scanning Electron Microscope (SEM) and the roughness of the machined surfaces was measured with roughometer of Talysurf-6. The experimental results show that the quality of the machined surfaces of SiC reinforced aluminium composites is predominantly controlled by the deformation mechanisms of SiC reinforcements, and the quality of the machined surfaces is better when reinforcements deform in the form of direct cutoff than in the form of pullout. The higher the volume fraction of SiC reinforcements, the worse the quality of the machined surfaces and the greater the amplitude of vibration and the average value of the cutting forces. On the same condition of volume fraction and cutting, the quality of the machined surfaces of SiC whiskers reinforced aluminium matrix composites is better than that of SiC particles reinforced aluminium matrix composites.

47

Jyothi, Ms A. Lalitha, Stanley Ebenezer Nitla, Yakobu Gaddepalli, Prabhash K, Veerendra G e Durga Prasad M. "Hydrophobic Coating on Metal Matrix Composites". International Journal for Research in Applied Science and Engineering Technology 12, n. 5 (31 maggio 2024): 5260–67. http://dx.doi.org/10.22214/ijraset.2024.62802.

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Abstract: The combination of traditional aluminum metal matrix composites (MMCs) with innovative reinforcement materials offers promising avenues for enhancing material properties and expanding application domains. In this study, aluminum matrix composites reinforced with ZrB2 (zirconium diboride) particles were fabricated using a stir casting technique. The addition of ZrB2 to the aluminum matrix aimed to improve mechanical strength, wear resistance, and thermal stability. Following fabrication, the resulting composite specimens were subjected to a surface modification process involving the application of a superhydrophobic coating. The superhydrophobic coating, characterized by its extreme water repellency and self-cleaning properties, was applied to the surface of the aluminum-ZrB2 composites using a spray-coating method. The coating material consisted of a hydrophobic compound integrated with nanostructured particles, engineered to achieve a hierarchical surface morphology that mimics natural superhydrophobic surfaces. The coated specimens were evaluated for their water repellency, contact angle measurements, and durability under various environmental conditions. The results of this study demonstrated that the combination of aluminum metal matrix composites with ZrB2 reinforcement, coupled with the application of a superhydrophobic coating, yielded surfaces with exceptional water-repellent properties. The coated composites exhibited high contact angles and low water adhesion, indicative of their superhydrophobic nature. Furthermore, the durability tests revealed the robustness of the coating against mechanical abrasion and environmental exposure. Overall, the integration of aluminum-ZrB2 composites with a superhydrophobic coating holds significant promise for applications requiring water-resistant surfaces, suchas aerospace components, marine structures, and outdoor equipment. This researchcontributes to advancing the development of multifunctional materials with tailoredsurface properties, paving the way for improved performance and longevity in diverse engineering applications

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Dikova, Tsanka, Jordan Maximov, Vladimir Todorov, Georgi Georgiev e Vladimir Panov. "Optimization of Photopolymerization Process of Dental Composites". Processes 9, n. 5 (28 aprile 2021): 779. http://dx.doi.org/10.3390/pr9050779.

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The aim of this paper is to perform optimization of photopolymerization process of dental composites in order to obtain maximum hardness. Samples (5 mm diameter; 2, 3 and 4 mm thickness) were made of Universal Composite (UC), Bulk fill Composite (BC) and Flowable Composite (FC). Light curing of specimens was performed with 600, 1000 and 1500 mW/cm2 light intensity and an irradiation time of 20, 40 and 60 s. Vickers microhardness on the top and bottom surfaces of samples was measured. Optimization was carried out via regression analysis using QStatLab software. Photopolymerization process parameters were calculated using a specially designed MatLab software-based algorithm. For all composites, regression models for hardness on top and bottom surfaces of composite layer were established. Layer thickness as well as hardness on top and bottom surfaces of each composite was calculated for 21 curing modes varying with light intensity and irradiation time. It was established that photopolymerization guidelines only of FC manufacturer guarantee the required hardness, while recommended regimes for UC and BC did not satisfy this requirement. Tables, containing recommended light curing regimes, were developed for three composite types, guaranteeing high hardness of composite restoration. They were designed to facilitate work of dentists in dental offices.

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Thiagarajan, C., R. Sivaramakrishnan e S. Somasundaram3. "Cylindrical grinding of Al/SiC metal matrix composites". Material Science Research India 7, n. 2 (8 febbraio 2010): 425–33. http://dx.doi.org/10.13005/msri/070212.

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This paper deals with an experimental study on the grindability of Al/SiC metal matrix composites in cylindrical grinding. Machining of metal matrix composites (MMCs) is an area to be focused and finishing processes such as grinding to obtain a good surface finish and damage-free surfaces are crucial for the application of these materials. Nevertheless, grinding of MMCs has received little attention so far, thereby a detailed study on that has been carried out. In the present work, experiments are carried out to study the effect of grinding parameters; wheel velocity, work piece velocity, feed and depth of cut and SiC volume fraction percentage on the responses; grinding force, surface roughness and grinding temperature. Surface integrity of the ground surfaces is assessed using a scanning electron microscope (SEM). There are no cracks and defects found on the cylindrical ground surfaces at high wheel and work piece velocities, low feed and depth of cut.

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Gun’ko, V. M., V. M. Bogatyrov, O. I. Oranska, L. I. Borysenko, J. Skubiszewska-Zięba, A. Książek e R. Leboda. "Structural features of ZnxOy/nanosilica composites". Applied Surface Science 276 (luglio 2013): 802–9. http://dx.doi.org/10.1016/j.apsusc.2013.04.002.

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