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Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Techniques de l'ingénieur appliqués à la métallurgie. Applications. Divers, Engineering techniques in metallurgy. Applications. Other aspects, Applications, Industrie automobile, Automotive engineering, Adhérence, Adhesion, Adherencia, Adhaesion, Application, Aplicación, Anwendung, Force adhérence, Adhesive strength, Fuerza adherencia, Haftfestigkeit, Industrie automobile, Automobile industry, Industria automóvil, Autoindustrie, Industrie aéronautique, Aeronautic industry, Industria aeronáutica, Luftfahrtindustrie, Morphologie, Morphology, Morfología, Plasma, Projection plasma, Plasma spraying, Proyección plasma, Plasmaspritzen, Projection à chaud, Hot spraying, Proyección en caliente, Spritzen, Revêtement conducteur, Conductive coating, Revestimiento conductor, Résistance mécanique, Strength, Resistencia mecánica, Festigkeit, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Adhesion testing, aircraft, atmospheric plasma spray (APS), automotive, copper, and electrically conductive coatings

Metallization of Carbon Fiber-Reinforced Polymer (CFRP) composites aggrandized their application to aircraft, automobile, and wind power industries. Recently, the metallization of CFRP surface using thermal spray technique, especially the cold spray, a solid state deposition technique, is a topic of research. However, a direct cold spray deposition on the CFRP substrate often imposes severe erosion on the surface owing to the high-impact energy of the sprayed particles. This urges the requirement of an interlayer on the CFRP surface. In the present study, the effect of surface treatment on the interlayer adhesion strength is evaluated. The CFRP samples were initially treated mechanically, chemically, and thermally and then an interlayer was developed by atmospheric plasma spray system. The quality of the coating is highly dependent on the splat taxonomy; therefore the present work also devoted to study the splat formation behavior using the splat-collection experiments, where the molten Cu particles impinged on the treated CFRP substrates. These results were correlated with the coating adhesion strength. The coating adhesion strength was measured by pull-out test. The results showed that the surface treatment, particularly the chemical treatment, was fairly successful in improving the adhesion strength.

Biochemistry, molecular biology, biophysics, Biochimie, biologie moléculaire, biophysique, Analytical chemistry, Chimie analytique, Pharmacology drugs, Pharmacologie, galénique, Pollution, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie analytique, Analytical chemistry, Méthodes chromatographiques et méthodes physiques associées à la chromatographie, Chromatographic methods and physical methods associated with chromatography, Méthodes chromatographiques en phase gazeuse, Gas chromatographic methods, Autres méthodes chromatographiques, Other chromatographic methods, Adsorbant, Adsorbent, Adsorbente, Analyse chimique, Chemical analysis, Análisis químico, Application, Aplicación, Article synthèse, Review, Artículo síntesis, Caractérisation, Characterization, Caracterización, Chromatographie HPLC, HPLC chromatography, Cromatografía HPLC, Chromatographie phase gazeuse, Gas chromatography, Cromatografía fase gaseosa, Chromatographie phase inverse, Reversed phase chromatography, Cromatografía fase inversa, Chromatographie échange ion, Ion exchange chromatography, Cromatografía cambio iónico, Diamant, Diamond, Diamante, Matériau composite, Composite material, Material compuesto, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Microscopie électronique transmission, Transmission electron microscopy, Microscopía electrónica transmisión, Morphologie, Morphology, Morfología, Phase stationnaire, Stationary phase, Fase estacionaria, Structure surface, Surface structure, Estructura superficie, Traitement surface, Surface treatment, Tratamiento superficie, Chromatographie HILIC, Hydrophilic Interaction Liquid chromatography, Adsorbents, Chromatography, Composites, and Detonation nanodiamond

The idea of using diamond and diamond containing materials in separation sciences has attracted a strong interest in the past decade. The combination of a unique range of properties, such as chemical inertness, mechanical, thermal and hydrolytic stability, excellent thermal conductivity with minimal thermal expansion and intriguing adsorption properties makes diamond a promising material for use in various modes of chromatography. This review summarises the recent research on the preparation of diamond and diamond based stationary phases, their properties and chromatographic performance. Special attention is devoted to the dominant retention mechanisms evident for particular diamond containing phases, and their subsequent applicability to various modes of chromatography, including chromatography carried out under conditions of high temperature and pressure.

Ecology, Ecologie, Environment, Environnement, Pollution, Sciences exactes et technologie, Exact sciences and technology, Terre, ocean, espace, Earth, ocean, space, Sciences de la terre, Earth sciences, Minéralogie, Mineralogy, Silicates, Phyllosilicate, sheet silicates, Filosilicato, Roche métaignée, metaigneous rocks, Roca metaígnea, Roche métamorphique, metamorphic rocks, Roca metamórfica, Serpentine, serpentine, Serpentina, Silicate, silicates, Silicato, Acide carbonique, Carbonic acid, Carbónico ácido, Acide chlorhydrique, hydrochloric acid, Acide minéral, inorganic acids, Acido inorgánico, Acide organique, organic acids, Acido orgánico, Acide oxalique, Oxalic acid, Oxálico ácido, Altération matériau, Material weathering, Alteración materiales, Amiante, asbestos, Amianto, Charge superficielle, Surface charge, Carga superficial, Chimie surface, Surface chemistry, Chrysotile, chrysotile, Crisotilo, Composition surface, Surface composition, Diacide carboxylique, Dicarboxylic acid, Diácido carboxílico, Diffraction RX, X-ray diffraction, Difracción RX, Etude comparative, Comparative study, Estudio comparativo, Microscopie électronique balayage, scanning electron microscopy, Microscopie émission champ, Field emission microscopy, Microscopía emisión campo, Morphologie, morphology, Morfología, Propriété surface, surface properties, Propiedad superficie, Serpentinite, serpentinite, Serpentinidad, Spectrométrie SIMS, Secondary ion mass spectrometry, Espectrometría SIMS, Spectrométrie masse ICP, ICP mass spectroscopy, Spectrométrie masse temps vol, Time of flight mass spectroscopy, Structure surface, Surface structure, Estructura superficie, Sédiment, sediments, Sedimento, Traitement chimique, Chemical treatment, Tratamiento químico, Traitement surface, Surface treatment, Tratamiento superficie, Imagerie spectrométrie masse, Imaging mass spectrometry, Matière en suspension, Suspended materials, Sólidos suspendidos, Serpentinitic sediments, electron microscopy, surface chemistry, surface composition, and weathering

Chrysotile asbestos is considered an environmental health hazard. It is postulated that the surface of chrysotile, with its inherent positive charge and chemical content of trace transition metals within the mineral is a causative factor of the concern. Weathering may reduce the negative health effects of chrysotile asbestos, by alteration of the outer brucite layer of the chrysotile. To assess the changes in the surface properties of chrysotile asbestos by simulated weathering, chrysotile was treated with oxalic, hydrochloric, and carbonic acids. Naturally occurring chrysotile, from a mine site and serpentinitic stream sediments from the Sumas River were analyzed and compared. Oxalic acid, a chelating acid, was the most effective at extracting the majority of the trace elements present in the chrysotile, reducing their positive surface charge and producing visible changes at the surface of the fibers as shown by Field Emission Scanning Electron Microsopy (FESEM). Carbonic acid had little effect on the surface properties. Stream environments had minor detectable effects on the surface properties on the chrysotile stream sediments.

Metallurgy, welding, Métallurgie, soudage, Condensed state physics, Physique de l'état condensé, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Généralités, General, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Dépôt de métaux et d'alliages, Metallic coatings, Acier haute résistance, High strength steel, Acero alta resistencia, Hochfester Stahl, Microscopie électronique transmission, Transmission electron microscopy, Microscopía electrónica transmisión, Transmissionselektronenmikroskopie, Morphologie, Morphology, Morfología, Résistance mécanique, Strength, Resistencia mecánica, Festigkeit, Spectrométrie photoélectron, Photoelectron spectrometry, Espectrometría fotoelectrón, ESCA Spektrometrie, Structure cristalline, Crystalline structure, Estructura cristalina, Kristallstruktur, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Zingage immersion, Hot dip galvanizing, Galvanización con cinc sumergido, Feuerverzinken, Amorphous oxides, Crystalline oxides, Steel, Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS)

Annealing of advanced high-strength steel (AHSS) grades often results in surfaces being fully covered by oxides due to alloying elements which diffuse to the steel surface during annealing and which are oxidized there by residual oxygen from the furnace atmosphere. However, these surface oxides tend to significantly hamper the hot-dip galvanizability and are therefore repeatedly under investigation with respect to their morphology and chemical composition for an optimization of the overall galvanizing performance. In the present work two different kinds of AHSS grades are analysed in detail by scanning electron microscopy as well as by X-ray photoelectron spectroscopy and transmission electron microscopy to characterize the formed surface oxides, clearly revealing that it is not only the chemical composition of the oxides influencing their morphology and structure: the oxidation potential of the annealing atmosphere is found to have a significant impact on the surface oxide characteristics, namely the degree of crystallinity, as well. Consequently, these findings can be used to improve the galvanizability of a steel grade by changing the surface oxide morphology.

Crystallography, Cristallographie cristallogenèse, Nanotechnologies, nanostructures, nanoobjects, Nanotechnologies, nanostructures, nanoobjets, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Etat condense: structure, proprietes mecaniques et thermiques, Condensed matter: structure, mechanical and thermal properties, Structure des liquides et des solides; cristallographie, Structure of solids and liquids; crystallography, Nanomatériaux : agrégats, nanoparticules, nanotubes et nanocristaux, Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals, Surfaces et interfaces; couches minces et trichites (structure et propriétés non électroniques), Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties), Structures de basse dimensionnalité (superréseaux, puits quantiques, multicouches): structure et propriétés non électroniques, Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties, Domaines interdisciplinaires: science des materiaux; rheologie, Cross-disciplinary physics: materials science; rheology, Science des matériaux, Materials science, Nanomatériaux et nanostructures : fabrication et caractèrisation, Nanoscale materials and structures: fabrication and characterization, Matériaux nanocristallins, Nanocrystalline materials, Sciences appliquees, Applied sciences, Electrotechnique. Electroenergetique, Electrical engineering. Electrical power engineering, Electroénergétique, Electrical power engineering, Conversion directe et accumulation d'énergie, Direct energy conversion and energy accumulation, Conversion électrochimique: piles et accumulateurs électrochimiques, piles à combustibles, Electrochemical conversion: primary and secondary batteries, fuel cells, Article synthèse, Review, Artículo síntesis, Carbone, Carbon, Carbono, Catalyseur sur support, Supported catalyst, Catalizador sobre soporte, Composition surface, Surface composition, Cristallinité, Crystallinity, Cristalinidad, Electrode carbone, Carbon electrode, Electrodo carbono, Electrode poreuse, Porous electrode, Electrodo poroso, Encapsulation, Encapsulación, Fonctionnalisation, Functionalization, Funciónalización, Graphitation, Graphitizing, Grafitización, Matériau nanoporeux, Nanoporous materials, Morphologie, Morphology, Morfología, Nanomatériau, Nanostructured materials, Nanoparticule, Nanoparticle, Nanopartícula, Nanoporosité, Nanoporosity, Nanoporosidad, Nanostructure, Nanoestructura, Pile combustible, Fuel cell, Pila combustión, Porosité, Porosity, Porosidad, Structure cristalline, Crystalline structure, Estructura cristalina, Structure surface, Surface structure, Estructura superficie, Support catalyseur, Catalyst support, Soporte catalizador, Traitement surface, Surface treatment, Tratamiento superficie, Transformation phase, Phase transformation, Transformación fase, 8107B, Graphitization, Heteroatom, Nanoporous carbon, and Surface modification

The ideal catalyst support toward development of high-performance electrodes for fuel cells should possess advantageous structural and chemical features concerning accessibility to framework surfaces and electrochemical stability of conducting frameworks. In order to satisfy these requirements for the design of fuel cells by using nanoporous carbon electrodes, a great deal of efforts has been devoted to the functionalization of nanoporous carbon electrodes. In this review, the recent developments of nanoporous carbon materials synthesis are summarized with introduction of their potentials in fuel cells. The focuses are placed on precise controls of porosity, crystallinity, and morphology, combined with the designs of surface structure, framework composition, and encapsulation of metal and metal oxide nanoparticles. Finally, some perspectives are provided for future developments and directions of the synthesis and functionalization of nanoporous carbon materials for fuel cell design.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Conductivité électrique, Electrical conductivity, Conductividad eléctrica, Dérivé du triazole, Triazole derivatives, Triazol derivado, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Graphène, Graphene, Matériau composite, Composite material, Material compuesto, Modification chimique, Chemical modification, Modificación química, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Polymère conducteur, Conducting polymers, Polymère conjugué, Conjugated polymer, Polímero conjugado, Polyélectrolyte, Polyelectrolyte, Polielectrolito, Propriété thermique, Thermal properties, Propiedad térmica, Propriété électrique, Electrical properties, Propiedad eléctrica, Préparation, Preparation, Preparación, Stabilité thermique, Thermal stability, Estabilidad térmica, Styrènesulfonate polymère, Styrenesulfonate polymer, Estireno sulfonato polímero, Thiophène dérivé polymère, Thiophene derivative polymer, Tiofeno derivado polímero, Traitement surface, Surface treatment, Tratamiento superficie, Ethylènedioxythiophène polymère, Graphène oxyde, Réaction click, A. Nano composites, A. Polymer―matrix composites (PMCs), B. Electrical properties, and D. Photoelectron spectroscopy (XPS)

The well dispersed graphene in poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) composites was achieved by chemical modification via click chemistry under mild condition in order to improve the electrical conductivity of polymer. Graphene sheets were prepared from natural graphite flake by a modified Hummers method followed by reducing with hydrazine. Graphene and PEDOT:PSS were functionalized with alkyne and azide, respectively followed by reacting via click chemistry at room temperature for 48 h using copper sulfate as catalyst. The successful functionalization and click reaction between terminal alkyne groups (―C≡C) on graphene sheets and terminal azide groups (—N3) of PED-OT:PSS were confirmed by Fourier Transform Infrared (FTIR), Raman and X-ray photoelectron (XPS) spectroscopy. The preliminary test to check the dissimilar dispersibility between graphene oxide and alkyne-modified graphene oxide in mixed water/hexane solvent was performed. Thermogravimetric analysis result exhibited the composites having excellent thermal stabilities due to the incorporation of graphene in PEDOT:PSS; however, clicked composites showed slightly lower thermal stabilities than unclicked ones as a result of cleavages of amide linkages and remaining oxygen-containing functionalities. It was also found that the surface morphologies observed by scanning electron microscope of clicked composites were smoother than those of unclicked composites because of the enhancement of interfacial interaction between graphene sheets and PEDOT:PSS matrix, resulting in a decrease in graphene agglomeration and, in turn, an increase in electrical conductivity.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Acrylate copolymère, Acrylate copolymer, Acrilato copolímero, Composé allylique, Allylic compound, Compuesto alílico, Copolymère réticulé, Crosslinked copolymer, Copolímero reticulado, Effet concentration, Concentration effect, Efecto concentración, Effet mémoire forme, Shape memory effect, Efecto memoria forma, Etude expérimentale, Experimental study, Estudio experimental, Limite élasticité, Yield strength, Límite elasticidad, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Polymérisation photochimique, Photopolymerization, Polimerización fotoquímica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Prépolymère, Prepolymer, Prepolímero, Rayonnement UV, Ultraviolet radiation, Radiación ultravioleta, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Uréthanne copolymère, Urethane copolymer, Uretano copolímero, Uréthanne polymère, Polyurethane, Uretano polímero, Graphène oxyde, UV cure, graphene oxide, hybrids, polyurethanes, and shape memory

Graphene oxide modified chemically with allyl isocyanate (iGO) was incorporated in various amounts into acrylate-terminated polyurethane (PU) via UV curing. The effects of this incorporation on the morphological, mechanical, dynamic mechanical, thermal and shape memory properties of the resulting hybrids were examined. The iGO nanoparticles incorporated into the PU chains acted as both multifunctional crosslinks and reinforcing fillers, and the effects were most pronounced at low iGO contents (0.5 and 1.0 wt%). Consequently, the glassy and rubbery state moduli, yield strength, glass transition temperature, shape fixity and shape recovery ratios were increased on adding up to 1 wt% iGO. At higher iGO loadings, the values of most of these properties decreased due to aggregation and the auto-inhibition of allyl compounds.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Copolymère séquencé, Block copolymer, Copolímero secuencia, Cristallinité, Crystallinity, Cristalinidad, Cristallisation isotherme, Isothermal crystallization, Cristalización isotérmica, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Interaction intermoléculaire, Intermolecular interaction, Interacción intermolecular, Lactone copolymère, Lactone copolymer, Lactona copolímero, Lactone polymère, Lactone polymer, Lactona polímero, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Point quantique, Quantum dot, Punto cuántico, Polymère optiquement actif, Optically active polymer, Polímero ópticamente activo, Préparation, Preparation, Preparación, Styrène copolymère, Styrene copolymer, Estireno copolímero, Séléniure de cadmium, Cadmium selenides, Séparation phase, Phase separation, Separación fase, Traitement surface, Surface treatment, Tratamiento superficie, Lactide copolymère, Lactide polymère, Stéréocomplexe, block copolymer, chirality, hybrid materials, nanoparticle, and quantum dot

A new nanoparticle/block copolymer (NP/BCP) hybrid material combining the unique properties of BCP poly(styrene)-b-poly(D-lactide) (PS-b-PDLA) and inorganic NP quantum dots CdSe was developed. A systematic study on the microphase separation of a series of PS-b-PDLAs by small-angle X-ray scattering showed that the degree of order of the separated microdomains depended on the initial state of the BCP and the measurement temperature and can be improved through isothermal crystallization of PDLA, thermal annealing and shear field etc. Incorporating a small amount of NPs into the BCP matrix can improve the mobility of the polymer chains and thus promote self-assembly of the BCP, which leads to hierarchically ordered structures. Excess NPs, however, cannot be completely incorporated into the PDLA domains, resulting in the phase transformation of the BCP, destruction of the ordered structure and even macroscopic phase separation due to the aggregation of NPs. An important observation is that stereocomplexation between PDLA and poly(L-lactide) could provide a driving force to promote microphase separation of the BCP. The strategy presented in the current work has potential applications for developing highly ordered NP/BCP hybrid materials.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Acrylique acide polymère, Acrylic acid polymer, Acrílico ácido polímero, Agent accrochage, Coupling agent, Agente enganche, Alumine, Alumina, Alúmina, Céramique oxyde, Oxide ceramics, Cerámica óxido, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau hybride, Hybrid material, Material híbrido, Morphologie, Morphology, Morfología, Polymérisation radicalaire, Free radical polymerization, Polimerización radicalar, Polyélectrolyte, Polyelectrolyte, Polielectrolito, Procédé sol gel, Sol gel process, Procedimiento sol gel, Propriété chimique, Chemical properties, Propiedad química, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Silane organique, Organic silane, Silano orgánico, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, Tratamiento superficie, A. Hybrid, B. Surface properties, and E. Surface treatments

Hybrid inorganic-organic materials are promising systems for a variety of applications due to their extraordinary properties from the combination of different building blocks. In this work, we present the synthesis and characterization of a hybrid material based on poly[acrylic acid] (PAA), 3-(trimethoxysilyl)propyl methacrylate (TMPM), and aluminum oxide (Al2O3). The synthesis was carried out using a two-step process: first, a polymerization via radical initiation, and subsequently, a sol-gel process. The hybrids were prepared by keeping constant the amount of acrylic acid and aluminum oxide precursor but changing the amount of TMPM. The physical and chemical properties of the hybrids were investigated using infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N2 absorption (SBET), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results indicate that all of the materials were simultaneous interpenetrating networks (SIPNs) and that the morphologies and the properties depend on the amount of TMPM used. All materials showed good thermal stability, and the surface area of the composite decreased as more TMPM was incorporated in the network.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Dépôt de métaux et d'alliages, Metallic coatings, Aluminium alliage, Aluminium alloy, Aluminio aleación, Aluminiumlegierung, Composite matrice métallique, Metal matrix composite, Compuesto matriz metalico, Céramique sans oxyde, Non oxide ceramics, Cerámica sin óxido, Etude expérimentale, Experimental study, Estudio experimental, Experimentelle Untersuchung, Laser, Láser, Matériau composite, Composite material, Material compuesto, Verbundwerkstoff, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Dispersionsgehaerteter Werkstoff, Matériau revêtement, Coating material, Material revestimiento, Morphologie, Morphology, Morfología, Nickel alliage, Nickel alloy, Níquel aleación, Nickellegierung, Nitrure de silicium, Silicon nitride, Silicio nitruro, Siliciumnitrid, Propriété mécanique, Mechanical properties, Propiedad mecánica, Préparation, Preparation, Preparación, Vorbereitung, Résistance usure, Wear resistance, Resistencia al desgaste, Verschleissfestigkeit, Titane alliage, Titanium alloy, Titanio aleación, Titanlegierung, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Tribologie, Tribology, Tribología, A. Intermetallics, A. Metal-matrix composites (MMCs), B. Wear, and D. Surface analysis

Si3N4-Ni60 is firstly used to improve the wear resistance of a TA7 (Ti-5Al-2.5Sn) titanium alloy surface by mean of a laser alloying (LA) technique. The synthesis of the hard composite coating on a TA7 titanium alloy by LA of Ni60-Si3N4 pre-placed powders was investigated by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and high resolution transmission electron microscope (HRTEM). Experimental results indicated that a number of the interdendritic lamellar eutectics, nanoscale ceramics (NC) and the amorphous phases were produced in such LA coating. The production of NC led the free energy to enhance, which increased the density of point defect, leading to the formation of hypersaturated state of point defect, causing lattice distortions. Compared with a TA7 alloy substrate, an improvement of the wear resistance was obtained for such LA composite coating.

Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Dépôt de matériaux non métalliques, Nonmetallic coatings, Corrosion, Action des agents de corrosion, Corrosion environments, Ablation, Ablación, Corrosion haute température, High temperature corrosion, Corrosión alta temperatura, Hochtemperaturkorrosion, Céramique, Ceramic materials, Cerámica, Keramik, Haute température, High temperature, Alta temperatura, Hochtemperatur, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Rasterelektronenmikroskopie, Morphologie, Morphology, Morfología, Mécanisme, Mechanism, Mecanismo, Oxydation, Oxidation, Oxidación, Revêtement non métallique, Non metal coating, Revestimiento no metálico, Nichtmetallischer Ueberzug, Température, Temperature, Temperatura, Temperatur, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, B. SEM, B. XRD, C. High temperature corrosion, and C. Oxidation

A dense SiC-Si coating with average thickness of 580 μm was prepared on graphite by pack cementation. The surface morphology evolution and ablation mechanism of the coating at about 1780 °C were investigated by oxy-acetylene flame. After applying SiC-Si coating, the ablation surface temperature dropped about 300 °C. The ablation products SiO2 presented high viscosity and provided good protection in the early-to-middle stage of the ablation. The mechanical denudation gradually became severe with the ablation time increasing. Finally, the convection between the gases formed in the subsurface and the ablative gases turned out to be the primary ablation barrier.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Electronique, Electronics, Electronique des semiconducteurs. Microélectronique. Optoélectronique. Dispositifs à l'état solide, Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices, Fabrication microélectronique (technologie des matériaux et des surfaces), Microelectronic fabrication (materials and surfaces technology), Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Domaines d'application, Application fields, Adhésif, Adhesive, Adhesivo, Argent, Silver, Plata, Conductivité thermique, Thermal conductivity, Conductividad térmica, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fabrication microélectronique, Microelectronic fabrication, Fabricación microeléctrica, Iode, Iodine, Iodo, Matériau composite, Composite material, Material compuesto, Microparticule, Microparticle, Micropartícula, Morphologie, Morphology, Morfología, Particule métallique, Metal particle, Partícula metálica, Particule sphérique, Spherical particle, Partícula esférica, Propriété thermique, Thermal properties, Propiedad térmica, Traitement chimique, Chemical treatment, Tratamiento químico, Traitement surface, Surface treatment, Tratamiento superficie, Adhésif conducteur, A. Polymer―matrix composites (PMCs), B. Thermal properties, and D. Scanning electron microscopy (SEM)

Heat dissipation is a critical issue in many areas such as the high-performance electronic devices. The present work gives a detailed investigation regarding a simple and efficient surface modification method, which can remarkably improve the thermal conductivity of the isotropically thermally conductive adhesives (TCAs). Herein we demonstrate that the thermal conductivity of TCAs based on micron-sized silver fillers can be improved to near eightfold merely through simple surface chemistry treatment of the fillers, without changing the conventional epoxy resin (adhesive) processing conditions. Experimental results show that the thermal conductivity of a TCA sample with iodine modified silver fillers (85 wt%, size 1-2 μm. near-spherical particles) achieved 13.5 Wm-1 K-1 when cured at 150 °C. Compared to the unmodified silver-based TCAs, only 1.7 Wm-1 K-1 was achieved when cured in the same condition. This work suggests that through modulating the filler interface of a TCA, the thermal conductivity of a TCA can be drastically improved. These TCAs with superior isotropic thermal conductivity may find many heat dissipation applications e.g. surface mounted devices (SMDs) and high power (printed circuit) motherboards.

Biochemistry, molecular biology, biophysics, Biochimie, biologie moléculaire, biophysique, Analytical chemistry, Chimie analytique, Pharmacology drugs, Pharmacologie, galénique, Pollution, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie analytique, Analytical chemistry, Méthodes chromatographiques et méthodes physiques associées à la chromatographie, Chromatographic methods and physical methods associated with chromatography, Autres méthodes chromatographiques, Other chromatographic methods, Mécanique fluide, Fluid mechanics, Mecánica flúido, Chromatographie phase liquide, Liquid chromatography, Cromatografía fase líquida, Effet paroi, Wall effect, Efecto pared, Efficacité plateau, Plate efficiency, Eficacia plato, Hauteur équivalente plateau théorique, Height equivalent to a theoretical plate, Altura equivalente plato téorico, Microappareillage, Microequipment, Microequipo, Microfluidique, Microfluidics, Microfluidic, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Microstructure, Microestructura, Miniaturisation, Miniaturization, Miniaturización, Morphologie, Morphology, Morfología, Résolution pic, Peak resolution, Resolución cresta, Structure surface, Surface structure, Estructura superficie, Système sur puce, System on a chip, Sistema sobre pastilla, Traitement surface, Surface treatment, Tratamiento superficie, Chip chromatography, Etching limitations, Pillar array column, Radially elongated pillars, and Sidewall effect

An important bottleneck of pillar array columns designed for liquid chromatography is that small deviations of the target 'magical distance' at the sidewall region leads to detrimental sidewall effects, due to local differences of linear velocities at the sidewall region versus other locations in the pillar bed. In the present study, we demonstrate that a lateral elongation of the pillar significantly increases the tolerance for offsets of the magical distance. By shifting the sidewall distance 600 nm for 2 pillar aspect ratio (AR) designs (AR = 3 and 9), only minor sidewall effects on the measured plate heights could be observed for the AR = 9 columns, while the plate height was roughly doubled when using the wrong versus the correct sidewall distance for the AR = 3 columns. Technologically, this constitutes a huge advantage because small deviations (order of 100 nm) between the set and the finally achieved value for the inter-pillar distance are very common using mid-UV lithography based etching processes.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Constituants de formulation, Compounding ingredients, Ignifugeants, retardateurs de flamme et réducteurs de fumée, Fireproof agents, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Additif, Additive, Aditivo, Agent accrochage, Coupling agent, Agente enganche, Dimension particule, Particle size, Dimensión partícula, Ethylène haute densité polymère, High density ethylene polymer, Etileno alta densidad polímero, Etude expérimentale, Experimental study, Estudio experimental, Hydroxyde de magnésium, Magnesium hydroxide, Magnesio hidróxido, Inflammabilité, Flammability, Inflamabilidad, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Oléfine polymère, Olefin polymer, Olefina polímero, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Retardateur flamme, Flame retardant, Retardador llama, Silane organique, Organic silane, Silano orgánico, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, and Tratamiento superficie

The modification of magnesium hydroxide (MH) with triethoxy vinyl silane (TVS) was carried out via three different methods and the results are discussed with respect to their effect on the flame retardant and the tensile properties of high density polyethylene (HDPE) nanocomposites. Via a xylene suspension of MH and TVS, via a water suspension of MH and TVS, and via powder mixing of MH and TVS. It was found that in all three cases, Si—O—Mg bonds formed on the MH particles surface. Also, this silane modification induced a certain level of particle agglomeration, but without modifying their morphology or particle size. It was also found that the flame retardant properties of the HDPE nanocomposites did not improve because of the use of silane modified MH. During the flame retardant tests, all nanocomposites passed the UL-94-HB, but it was observed that the flame permanence time was longer when using modified MH. The tensile properties were negatively affected by the addition of unmodified MH; the nanocomposites became hard and brittle, with reduced flexibility. This negative effect was diminished when using silane modified MH.

Civil engineering, Génie civil, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Dépôt de matériaux non métalliques, Nonmetallic coatings, Corrosion, Action des agents de corrosion, Corrosion environments, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Cinétique, Kinetics, Cinética, Kinetik, Corrosion, Corrosión, Korrosion, Délaminage, Delamination, Delaminación, Schichtabloesung, Morphologie, Morphology, Morfología, Oxyde de zinc, Zinc oxide, Zinc óxido, Zinkoxid, Polymère, Polymer, Polímero, Revêtement non métallique, Non metal coating, Revestimiento no metálico, and Nichtmetallischer Ueberzug

Industrially prepared materials surfaces often possess complex morphologies and topographies. Using rough model interfaces, the effect of the surface morphology on the delamination of a polymer coating from zinc surfaces is investigated in this work. Zinc oxide particles of different shapes with characteristic dimensions ∼1μm were deposited on zinc surfaces to serve as model corrosion products with well-defined morphologies. Surfaces with spherical, rod-shaped, and twin-plate-shaped zinc oxide particles were prepared and characterized by scanning electron microscopy (SEM) as well as X-ray diffraction (XRD). The surfaces were subsequently coated with poly(vinyl butyral) (PVB) as a model for a weakly bound polymer coating. Scanning Kelvin probe (SKP) measurements were carried out in humid air to study the delamination kinetics. Results were compared to PVB on zinc. While delamination is fastest on zinc without zinc oxide particles, the delamination rate on the particle-covered surfaces strongly depends on the particle morphology. Delamination rate increases in the order sphere < rod < twin-plate, with differences by one order of magnitude between fastest and slowest.The differences in delamination rate can be understood based on the surface energies of the terminating surfaces of the particles, and the resulting differences in stability under conditions of zinc oxide dissolution.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Sciences biologiques et medicales, Biological and medical sciences, Sciences biologiques fondamentales et appliquees. Psychologie, Fundamental and applied biological sciences. Psychology, Industries agroalimentaires, Food industries, Généralités, General aspects, Manutention, stockage, conditionnement, transport, Handling, storage, packaging, transport, Amidon, Starch, Almidón, Argile organique, Organic clay, Arcilla orgánica, Biodégradabilité, Biodegradability, Biodegradabilidad, Composé de l'ammonium quaternaire, Quaternary ammonium compound, Amonio cuaternario compuesto, Effet concentration, Concentration effect, Efecto concentración, Emballage, Packaging, Empaque, Etude expérimentale, Experimental study, Estudio experimental, Indice oxygène, Oxygen index, Indice oxígeno, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Oside polymère, Oside polymer, Osido polímero, Perméabilité gaz, Gas permeability, Permeabilidad gas, Produit alimentaire, Foodstuff, Producto alimenticio, Propriété biologique, Biological properties, Propiedad biológica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété transport, Transport properties, Propiedad transporte, Traitement surface, Surface treatment, and Tratamiento superficie

Starch/clay bionanocomposites were prepared by incorporation of varying concentrations of nanoclay (Cloisite® 30B) through solution blending. The chemical interaction of starch with clay was evidenced from ultraviolet-visible (UV-visible) and fourier transform infrared spectroscopy. The material was also characterized through X-ray diffraction, transmission electron microscopy, and scanning electron microscopy study. The bionanocomposites were found to be more thermally stable as revealed from thermogravimetric analysis. The fire retardancy of the bionanocomposites was investigated from limiting oxygen index measurement. The result showed improvement of this property with increase in clay loading. From the measurement of oxygen permeabilities, it was found that the oxygen barrier property of starch/clay (10%) was improved by more than three times compared to virgin starch. The biodegradability of the material combined with the above mentioned properties could make it applicable as food packaging material.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Acide stéarique, Stearic acid, Esteárico ácido, Carbonate de calcium, Calcium carbonate, Calcio carbonato, Degré dispersion, Dispersion degree, Grado dispersión, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Lactique acide polymère, Lactic acid polymer, Láctico ácido polímero, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Module conservation, Storage modulus, Módulo conservación, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété rhéologique, Rheological properties, Propiedad reológica, Propriété thermique, Thermal properties, Propiedad térmica, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, Tratamiento superficie, A. Particle-reinforcement, A. Polymer―matrix composites (PMCs), D. Electron microscopy, and D. Thermal analysis

The effect of nano-calcium carbonate on chain linked poly(lactic acid) was investigated. In order to improve inorganic nanofillers/polymer compatibility CaCO3 nanoparticle surface was treated by stearic acid. The nanocomposites were prepared by means of solution blending and further studied by using dynamic mechanical analysis, fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. Morphological analysis performed on nanocomposites fractured surfaces has revealed that the CaCO3 modification induces homogeneous and fine dispersion of nanoparticles into polymer as well as strong interfacial adhesion between the two phases. An increase in the Tg and storage modulus of the resulting nanocomposites was observed with the increase of calcium carbonate ratio. Thermogravimetric results showed a lower degradation temperature with the increase of calciium carbonate ration in the polymer matrix.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Argile organique, Organic clay, Arcilla orgánica, Caoutchouc thermoplastique, Thermoplastic rubber, Caucho termoplástico, Caprolactone polymère, Polycaprolactone, Caprolactona polímero, Esteruréthanne polymère, Esterurethane polymer, Esteruretano polímero, Etude expérimentale, Experimental study, Estudio experimental, Lactone polymère, Lactone polymer, Lactona polímero, Matériau composite, Composite material, Material compuesto, Montmorillonite, Montmorilonita, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Perméabilité vapeur eau, Steam permeability, Permeabilidad vapor agua, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Polymère greffé, Graft polymers, Polymérisation ouverture cycle, Ring opening polymerization, Polimerización abertura ciclo, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété transport, Transport properties, Propiedad transporte, Relation structure propriété, Property structure relationship, Relación estructura propiedad, Traitement surface, Surface treatment, Tratamiento superficie, Uréthanne élastomère, Polyurethane elastomer, Uretano elastómero, Mélangeage état fondu, A. Nanoclays, A. Nanocomposites, A. Polymers, B. Thermomechanical properties, and B. Transport properties

The lamellar structure of montmorillonite (MMT) clays exhibits an interesting potential to improve the barrier properties of thermoplastic polyurethanes (TPU). However direct melt blending of an ester-based TPU and functional organoclays, despite showing good filler dispersion, did not allowed for improving neither barrier properties (i.e., sorption and diffusion to water vapor) not mechanical performances with respect to the unfilled TPU. Therefore, two alternative strategies involving poly(ε-caprolactone) (PCL)/ organoclay masterbatches were explored to investigate the possibility to prepare materials with improved mechanical and barrier properties. In the first strategy, a PCL/organoclay masterbatch with high inorganic content was obtained by melt-blending (coined free PCL masterbatch), whereas in the second strategy PCL-grafted organoclay nanohybrids, also with high inorganic content were synthesized by in situ intercalative grafting/ring-opening polymerization of ε-caprolactone (CL). Purposely, ROP of CL was initiated from hydroxyl groups available onto the MMT surface actually organo-modified by alkylammonium cations bearing hydroxyl functions (coined nanohybrid PCL masterbatch). These highly-filled PCL masterbatches (with ca. 25 wt% in inorganics) were then added into the ester-based TPU to prepare nanoclay/polyurethane nanocomposites by melt-blending. The morphology and dispersion of the resulting materials were characterized by X-ray diffraction and transmission electron microscopy. Improved sorption and diffusion properties towards water vapor as well as mechanical properties were measured. Herein, these results are discussed as a function of both clay dispersion and matrix/organoclay interaction.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Aluminium Hydroxyde, Aluminium Hydroxides, Aluminio Hidróxido, Caoutchouc nitrile, Nitrile rubber, Caucho nitrilo, Cinétique, Kinetics, Cinética, Etude expérimentale, Experimental study, Estudio experimental, Hydroxyde double lamellaire, Layered double hydroxide, Hidróxido doble laminar, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Peroxyde organique, Organic peroxide, Peróxido orgánico, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété traction, Tensile property, Propiedad tracción, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Relation mise en oeuvre structure, Structure processing relationship, Relación puesta en marcha estructura, Soufre, Sulfur, Azufre, Stéarate, Stearate, Estearato, Traitement surface, Surface treatment, Tratamiento superficie, Vulcanisat, Vulcanizate, Vulcanizado, Vulcanisation, Vulcanization, Vulcanización, Zinc Hydroxyde, Zinc Hydroxides, Zinc Hidróxido, Sulfur vulcanization, and Zinc oxide

The aim of this investigation is to highlight the potentials of layered double hydroxides (LDH) and to serve as a replacement for zinc oxide and stearic acid from the basic rubber formulation. This will eventually result in about a 10× significant reduction of Zn2+ ion concentration in the final compound. The unique advantage of stearate ion-modified LDH is the delivery of zinc ions to accelerate and stearate ions to activate the vulcanization process. Furthermore, it can also reinforce the rubber matrix by virtue of its layered structure as nanofiller.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Appareillage et mise en oeuvre, Machinery and processing, Matières plastiques, Plastics, Revêtement, métallisation, coloration, Coating, metallization, dyeing, Antifongique, Antifungal agent, Antifúngico, Argent Nitrate, Silver Nitrates, Plata Nitrato, Argent, Silver, Plata, Cyclène copolymère, Cycloalkene copolymer, Cicleno copolímero, Dépôt chimique, Chemical deposition, Depósito químico, Emballage matière plastique, Plastic bag packaging, Empaque material plástico, Ethylène basse densité linéaire polymère, Linear low density ethylene polymer, Etileno baja densidad lineal polimero, Etude expérimentale, Experimental study, Estudio experimental, Fongicidie, Fungicidal effect, Efecto fungicido, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Mélange polymère, Polymer blends, Nanoparticule, Nanoparticle, Nanopartícula, Oléfine copolymère, Olefin copolymer, Olefina copolímero, Oléfine polymère, Olefin polymer, Olefina polímero, Particule métallique, Metal particle, Partícula metálica, Perméabilité vapeur eau, Steam permeability, Permeabilidad vapor agua, Propriété biologique, Biological properties, Propiedad biológica, Propriété transport, Transport properties, Propiedad transporte, Relation mise en oeuvre structure, Structure processing relationship, Relación puesta en marcha estructura, Relation structure propriété, Property structure relationship, Relación estructura propiedad, Réaction sonochimique, Sonochemical reaction, Reacción sonoquímica, Réduction chimique, Chemical reduction, Reducción química, Traitement surface, Surface treatment, and Tratamiento superficie

Silver nanoparticles were deposited on the surface of an extruded film of linear low density polyethylene/cyclo olefin copolymer (LLDPE/COC) blend by an ultrasound-assisted method. A series of LLDPE/COC/silver nanocomposites, containing 0.02, 0.05, 0.08 and 0.1 mol/L of AgNO3 were prepared and characterized. The effect of ultrasound method on the silver deposition on the film surface was characterized as well as the effect of silver nanoparticles on their fungicidal characteristics. The silver action and biocide effect of the films were enhanced significantly as the silver content increased from 0.02 to 0.08 mol/L of AgNO3 and after that no significant enhancement was observed. From the UV-Vis analysis and transmission electron microscopic observations, the particle shape, size and size distribution were determined. Films of LLDPE/COC blends with silver deposition exhibited a noticeable increase in water vapor barrier properties with the increase in the concentration of AgNO3 and demonstrated good fungicidal activity, specifically against fungus Aspergillius niger. The observed results could be applied in the design of industrial films for packaging.