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Effect of graphene coatings on the morphology of submillimeter thin copper wires after salt spray aging / Krzysztof Lis in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
[article]
Titre : Effect of graphene coatings on the morphology of submillimeter thin copper wires after salt spray aging Type de document : texte imprimé Auteurs : Krzysztof Lis, Auteur ; Krzysztof Placek, Auteur ; Spyros Diplas, Auteur ; Martin F. Sunding, Auteur ; Sandeep M. Gorantla, Auteur ; Grazyna Gryglewicz, Auteur ; Alicja Bachmatiuk, Auteur Année de publication : 2023 Article en page(s) : p. 1913-1921 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion
Cuivre
Essais de brouillard salin
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
Métaux -- Revêtements protecteurs
Morphologie (matériaux)
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Unprotected copper conductors are prone to oxidation and corrosion, especially when in contact with salt water or at high temperature. In this study, we compared commercially available coating with graphene oxide and plasma-enhanced chemical vapor deposition (PECVD) graphene coated wires in terms of antioxidation and anticorrosion protection. Samples were subjected to aging tests in a salt spray chamber. Thereafter, both the degree of coverage and surface protection were assessed by X-ray photoelectron spectroscopy measurements and scanning electron microscope images, which showed significant surface protection for both graphene coatings. Raman spectra obtained from the transferred coatings revealed their structural stability, which shows that it is possible to successfully use few atomic-layers-thick coatings to protect commercially available wires. Wire resistance tests performed at temperatures up to 320°C showed similar or better results for graphene coatings than for commercially coated wires. Additionally, images of the wires after high temperature tests showed high antioxidation protection for graphene coatings, especially for PECVD. The results of this study can be applied for further research on mechanical suitability of the coatings and wires themselves, especially after high-temperature CVD processes. Such studies may lead to novel Cu wire processing technologies. Note de contenu : - Coverage and corrosion protection
- Coating quality assessment
- Resistivity measurements
- Table 1 : Summary of samples discussed in the study
- Table 2 : Results of resistance measurements at room temperature for wires before and after the aging processDOI : https://doi.org/10.1007/s11998-023-00786-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00786-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40170
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1913-1921[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible Effect of hydrophilic or hydrophobic interactions on the self-assembly behavior and micro-morphology of a collagen mimetic peptide / Xiaomin Luo in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
[article]
Titre : Effect of hydrophilic or hydrophobic interactions on the self-assembly behavior and micro-morphology of a collagen mimetic peptide Type de document : texte imprimé Auteurs : Xiaomin Luo, Auteur ; Qianqian Huo, Auteur ; Liu Xinhua, Auteur ; Chi Zheng, Auteur ; Ying Liu, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie biomimétique
Collagène
Dynamique moléculaire
Hydrophilie
Hydrophobie
Morphologie (matériaux)
Peptides
Systèmes auto-assemblésIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Peptide self-assembles with bionic properties have been widely utilized for bioactive drugs and biomedical materials. Collagen mimetic peptide (CMP) gains more attention due to its unique advantages in biosecurity and function. Unfortunately, the self-assembly mechanism of CMP, particularly the effect of intermolecular forces on its self-assembly behavior and morphology, is still unrecognized. Herein, the hydrophilic glycidol (GCD) and hydrophobic Y-glycidyl ether oxypropyl trimethoxysilane (GLH) were grafted onto the side chains of CMP through the ring-opening reaction (GCD/CMP, GLH/CMP). Subsequently, the effects of hydrophilic and hydrophobic interactions on the self-assembly behavior and morphology of CMP were further studied. The results substantiated that the GCD/CMP and GLH/CMP self-assembly followed “nucleation-growth” mechanism, and the supererogatory hydrophilic and hydrophobic groups prolonged the nucleation and growth time of CMP self-assembly. Noted that the hydrophilic interaction had stronger driving effects than hydrophobic interaction on the self-assembly of CMP. The GCD/CMP and GLH/CMP self-assembles exhibited fibrous 3D network and microsphere morphology, respectively. Furthermore, the GLH/CMP self-assembles had better resistance to degradation. Consequently, the microtopography and degradation properties of CMP self-assembles could be controlled by the hydrophilic and hydrophobic interactions between CMP, which would further provide a way for subsequent purposeful design of biomedical materials. Note de contenu : - EXPERIMENTS : Materials - Preparation of GCD/CMP, GLH/CMP and their homologous assemblies - Structural characterization of GCD/CMP, GLH/CMP - Self-assembly kinetics of GCD/CMP and GLH/CMP assemblies - Mico-morphology analysis of GCD/CMP and GLH/CMP assemblies - Performance characterization of GCD/CMP and GLH/CMP assemblies
- RESULTS AND DISCUSSION : Preparation and structural analysis of GCD/CMP and GLH/CMP - The self-assembly behavior of CMP, GCD/CMP and GLH/CMP - Performance analysis of CMP, GCD/CMP and GLH/CMP assemblies
- Table 1 Self-assembly rates of CMP, GCD/CMP and GLH/CMPDOI : https://doi.org/10.1186/s42825-020-00054-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00054-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37476
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p.[article]Effect of nanoclay surface modifier chemical reactivity on morphology and rheological properties of PP/PA6 blend nanocomposite / G. R. Pircheraghi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 4 (08/2013)
[article]
Titre : Effect of nanoclay surface modifier chemical reactivity on morphology and rheological properties of PP/PA6 blend nanocomposite Type de document : texte imprimé Auteurs : G. R. Pircheraghi, Auteur ; Hossein Nazockdast, Auteur ; M. M. Salehi, Auteur Année de publication : 2013 Article en page(s) : p. 354-360 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Argile
Cations
DiamineUne diamine est un type de polyamine contenant exactement deux groupes amine. Les diamines sont principalement utilisées comme monomères pour synthétiser des polyamides, des polyimides et des polyurées. La principale diamine produite est le 1,6-diaminohexane, précurseur du Nylon 6-6, suivie de l'éthylènediamine1. L'hydrazine (H2NNH2) n'est en général pas considérée comme une diamine puisque ce n'est ni une amine (pas de carbone), ni une dibase.
Morphologie (matériaux)
Nanoparticules
Polyamide 6
Polypropylène
Rhéologie
Traîtements de surfaceIndex. décimale : 668.4 Plastiques, vinyles Résumé : An attempt was made to explore the role of nanoclay surface modifier chemical reactivity on the morphology and the rheological properties of a polypropylene/polyamide6 (PP/PA6 75/25) nanocomposite blend. The Na-MMT surface was modified with two types of cations; a) diamine cation (D-Clay), and b) a combination of diamine and quaternary alkylammonium cations (A-Clay) via cation exchange reaction. The „nanocomposites samples compatibilized with PP-g-MA were prepared by melt compounding in an internal mixer. The XRD patterns indicated the intercalated/exfoliated microstructure for both nanocomposite samples. The SEM results showed a significant decreases in the PA6 droplet size, from 3.2?m of the simple blend to the 0.4?m in the D-Clay containing sample. Moreover, in the sample containing A-Clay the average droplet size was found to be 1?m. The D-Clay containing sample showed the rheological properties similar to a simple blend in high frequencies with a nonterminal be„havior in low frequencies storage modulus. This was explained by locating of D-Clay layers in the interphase and hence, significantly reducing the effective interfacial tension, ?/R. In contrast, the sample containing A-Clay showed an increased complex viscosity and storage modulus within a range of frequencies, which was attributed to presence of a large amount of A-Clay layers in the PP matrix. These types of nanoclay partitioning were explained by the possibility of chemical reaction between amine group of nanoclay surface modifier and maleic group of PP-g-MA compatibilizer or in-situ formed block copolymer. Consequently, the D-Clay layers bounded with PP-g-MA is preferentially located in the interphase, while, the non reactive nanoclay layers (containing alkylammonium cations) is dispersed in the PP matrix by assistance of PP-g-MA. These findings were also evidenced by TEM micrograph of both nanocomposite samples. Note de contenu : - EXPERIMENTAL/MODELING/SIMULATION : Materials - Na-MMT surface modification - Nanocomposite preparation
- CHARACTERIZATIONDOI : 10.3139/217.2680 En ligne : https://drive.google.com/file/d/1_UVNJId8hAvNEJDYdeG9PJdPTXD622Ly/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19279
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 4 (08/2013) . - p. 354-360[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15396 - Périodique Bibliothèque principale Documentaires Disponible Effect of a novel chemical treatment on the physico-thermal properties of sugarcane nanocellulose fiber reinforced epoxy nanocomposites / H. Mohit in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 2 (05/2020)
[article]
Titre : Effect of a novel chemical treatment on the physico-thermal properties of sugarcane nanocellulose fiber reinforced epoxy nanocomposites Type de document : texte imprimé Auteurs : H. Mohit, Auteur ; V. Arul Mozhi Selvan, Auteur Année de publication : 2020 Article en page(s) : p. 211-220 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Canne à sucre et constituants
Caractérisation
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Composites à fibres -- Propriétés physiques
Composites à fibres -- Propriétés thermiques
Composites à fibres végétales
Epoxydes
Extraction (chimie)
Humidité -- Absorption:Eau -- Absorption
Morphologie (matériaux)
Nanoparticules
PorositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : In the present investigation, a novel chemical treatment was introduced for the extraction of nanocellulose fibers from sugarcane bagasse and applied as reinforcement material to enhance the physical properties and thermal stability of epoxy nanocomposites. Epoxy nanocomposites with different weight fractions were fabricated using a wet layup process followed by furnace heating to remove the residual moisture content. The influence of surface modified sugarcane nanocellulose fiber loading on morphological (transmission electron microscope) properties of epoxy nanocomposites was investigated. The porosity and water absorption increase with the increment in fiber weight fraction for both treated and untreated nanocellulose fiber-epoxy composites. Among the various treatment processes, the alkali-treated fibers reinforced epoxy composites showed better thermal stability and water absorption resistance under 10 wt.% of nanocellulose fiber reinforcement. Note de contenu : - MATERIALS AND METHODS : Sugarcane fiber extraction - Composite fabrication - Composite characterization
- RESULTS AND DISCUSSION : Effect on physical properties - Effect on thermal properties - MorphologyDOI : https://doi.org/10.3139/217.3855 En ligne : https://drive.google.com/file/d/1HXrO7u2Gs3Fktbr9HH4OQAMIY_qaXRp-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34015
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Code-barres Cote Support Localisation Section Disponibilité 21674 - Périodique Bibliothèque principale Documentaires Disponible Effect of operating parameters on the structural growth of ZnAl layered double hydroxide on AA6082 and corresponding corrosion resistance properties / Muhammad Ahsan Iqbal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
[article]
Titre : Effect of operating parameters on the structural growth of ZnAl layered double hydroxide on AA6082 and corresponding corrosion resistance properties Type de document : texte imprimé Auteurs : Muhammad Ahsan Iqbal, Auteur ; Michele Fedel, Auteur Année de publication : 2019 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages
Anticorrosifs
Anticorrosion
Composés organiques -- Synthèse
Hydroxydes doubles lamellaires
Morphologie (matériaux)
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, a series of ZnAl layered double hydroxide (ZnAl-LDH) thin films were synthesized on an AA6082 alloy by a single-step hydrothermal process at different synthesis parameters, including reaction temperature, reaction time, pH, and the relation between the LDH structural variations, and the corresponding corrosion resistance properties are briefly reported. The as-prepared synthetic coatings were characterized by scanning electron microscopy and X-ray diffraction. The corresponding corrosion properties were evaluated through potentiodynamic polarization curves and through electrochemical impedance spectra. The findings demonstrated that synthesis parameter variations impart an influential effect on the geometry of LDH, film thickness, and structural morphologies which have a significant impact on LDH corrosion resistance properties. The ZnAl-LDH corrosion resistance was found to increase with respect to extended high temperature and aging time, while the synthetic pH conditions also promoted LDH growth and film thickness, relative to lower-pH reaction conditions. The optimization results are attributed to high ZnAl-LDH corrosion resistance and act as a strong barrier film and ion-exchange surface area. The ZnAl-LDH films at 80°C-18r-6.5pH have shown much lower corrosion current density compared to bare AA6082, and a decrease of up to five orders of magnitude is observed. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ZnAl layered double hydroxide film
- CHARACTERIZATIONEn ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00227-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33022
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