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Antimicrobial surface coating as a pathway to curb resistance : preparation, mode of action and future perspective / Vincent Ngunjiri Mwangi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)
[article]
Titre : Antimicrobial surface coating as a pathway to curb resistance : preparation, mode of action and future perspective Type de document : texte imprimé Auteurs : Vincent Ngunjiri Mwangi, Auteur ; Edwin Shigwenya Madivoli, Auteur ; Mourine Kangogo, Auteur ; Sammy Indire Wanakai, Auteur ; Walyambillah Waudo, Auteur ; Dennis Mwanza Nzilu, Auteur Année de publication : 2024 Article en page(s) : p. 799-810 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine
Antimicrobiens
Argent
Chaux
Inhibition microbienne
Nanoparticules
Oxyde de cérium
Oxyde de cuivre
Oxyde de magnésiumL'oxyde de magnésium, communément appelé magnésie, a pour formule MgO et se présente sous la forme de poudre blanche très fortement basique absorbant l'eau et le dioxyde de carbone présents dans l'atmosphère.
STRUCTURE : L'oxyde de magnésium est un cristal ionique. L'oxyde de magnésium a une structure comparable à celle du chlorure de sodium7. Cela se traduit par
Un réseau d'anion oxygène formant une structure de type cubique à faces centrées
Un réseau de cation magnésium occupant l'ensemble des sites octaèdriques.
L'oxyde de magnésium est un matériau modèle des cristaux ioniques car la faible électronégativité du magnésium, et la forte électronégativité de l’oxygène font que la structure de l’oxyde de magnésium peut s’expliquer quasi uniquement grâce à des interactions entre des particules ponctuelles chargées 10.
La surface de l'oxyde de magnésium la plus stable dans le vide est obtenue en réalisant une coupe selon le plan cristallographique (100). Les particules d'oxyde de magnésium produites par combustion du magnésium métallique présentent d'ailleurs une forme cubique révélatrice de la présence de ces plans. Néanmoins, en présence d'eau, la surface de l'oxyde de magnésium est couverte d'ions hydroxyles qui stabilisent les plans (111)
PRODUCTION : La majeure partie de l'oxyde de magnésium est actuellement obtenue soit à partir de carbonate de magnésium MgCO3 qui constitue certains minéraux tels que la magnésite, soit à partir de chlorure de magnésium que l'on extrait de l'eau de mer ou de saumures souterraines.
Oxyde de titane
Oxyde de zinc
Oxydes métalliques
Résistances aux antibiotiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Antimicrobial resistance has proven to be an existential threat that endangers the health of human beings. The ease of accessing conventional antibiotics, and their unlimited and unregulated use and often misuse is seen to be a contributing factor to the rise in the resistance of microbes toward medications. The overuse of these medications in the agricultural sector also adds to the rising burden of antibiotic resistance. In line with efforts to counter the threat of antimicrobial resistance and the menace of hospital acquired infections developing antimicrobial surface coatings that can eliminate microbes that get deposited on those coatings is essential. This review aims to bring an understanding of antimicrobial resistance mechanisms, the preparation and mode of action and the future perspective of the antimicrobial surface coatings. Note de contenu : - ANTIBIOTIC RESISTANCE MECHANISMS
- NANOPARTICLES AS ANTIMICROBIAL SURFACE COATINGS : Silver nanoparticles - Titanium oxide nanoparticles - Zinc oxide nanoparticles - Copper oxide nanoparticles - Magnesium oxide nanoparticles - Calcium oxide nanoparticles - Cerium oxide nanoparticles - Aluminum oxide nanoparticles - Bimetallic oxide nanoparticles
- Table 1 Antimicrobial metal nanoparticles, microorganisms they inhibit and zones of inhibitionDOI : https://doi.org/10.1007/s11998-023-00879-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00879-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41060
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Code-barres Cote Support Localisation Section Disponibilité 24737 - Périodique Bibliothèque principale Documentaires Disponible 24688 - Périodique Bibliothèque principale Documentaires Disponible Characteristics, antibacterial activity, and antibiofilm performance of a polysiloxane coating filled with organically modified Cu2O / Phi Hung Dao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
[article]
Titre : Characteristics, antibacterial activity, and antibiofilm performance of a polysiloxane coating filled with organically modified Cu2O Type de document : texte imprimé Auteurs : Phi Hung Dao, Auteur ; Anh Hiep Nguyen, Auteur ; Thanh Thuy Tran, Auteur ; Thuy Chinh Nguyen, Auteur ; Thi Thu Trang Nguyen, Auteur ; Xuan Thai Nguyen, Auteur ; Thi Mai Tran, Auteur ; An Quan Vo, Auteur ; Huu Nghi Do, Auteur ; Minh Quan Pham, Auteur ; Ngoc Nhiem Dao, Auteur ; Ngoc Tan Nguyen, Auteur ; Hoang Nghia Trinh, Auteur ; Hoang Thai, Auteur Année de publication : 2023 Article en page(s) : p. 1949-1961 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Biofilms
Eau de mer
Inhibition microbienne
Nanoparticules
Oxyde de cuivre
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements antisalissures:Peinture antisalissures
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Test d'immersionIndex. décimale : 667.9 Revêtements et enduits Résumé : The effects of Cu2O nanoparticles (Cu2O NPs) modified with 3-(trimethoxysilyl)propyl methacrylate (TMSPM) (m-Cu2O NPs) on the properties of a polysiloxane (PS) coating were investigated. The organic surface modifications improved the antimicrobial activity of the Cu2O NPs and their dispersion in a PS matrix. Due to the broad dispersion of the m-Cu2O NPs, the PS/m-Cu2O coating exhibited better mechanical properties and better thermal stability than unmodified Cu2O (u-Cu2O) coatings. The onset temperature of PS/m-Cu2O was 24 °C higher than that of the neat PS coating and 11 °C higher than that of the PS/u-Cu2O coating. The PS/m-Cu2O coating exhibited high antibacterial activity for sulfate-reducing bacterial strains, but the PS/m-Cu2O coating showed slight bacterial inhibition of Pseudomonas stutzeri B27 bacteria (which were isolated under seawater at Phu Quoc Island, Kien Giang Province, Vietnam). Biofilm inhibition by the PS coatings with and without the m-Cu2O NPs was also tested with a natural seawater immersion test. After a 60-day test, the biofilm formed on the PS coating surface was ten times thicker than that on the PS/m-Cu2O coating. Fourier transform infrared spectroscopy (FTIR) data and the surface properties of the coating indicated that immersion in natural seawater insignificantly affected the functional groups of the coating but had a substantial influence on the smoothness of the coating, which made the surface of the coating more hydrophilic. These results suggested that the PS/m-Cu2O could be used as an antifouling coating for the marine industry. Note de contenu : - EXPERIMENTAL : Materials - Surface modification of Cu2O nanoparticles - Preparation of polysiloxane coatings containing m-Cu2O NPs - Preparation of antifouling paint coatings for biofilm resistance by immersion in natural seawater - Immersion of the investigated coatings in natural seawater - Analyses
- RESULTS AND DISCUSSION : Effect of organically modified Cu2O NPs on the mechanical properties of the polysiloxane coatings - Thermal behaviors of polysiloxane coatings containing Cu2O NPs - Morphologies of the polysiloxane coatings containing m-Cu2O NPs - Antibacterial activities of polysiloxane coatings containing m-Cu2O NPs - Investigation of biofilm inhibition by the polysiloxane coatings containing m-Cu2O NPs with immersion in natural seawater in the laboratory
- Table 1 : Characteristics and qualities of the seawater at the testing site
- Table 2 : Physicomechanical properties of the PS/Cu2O NP coatings
- Table 3 : Antimicrobial activities of u-Cu2O NPs and m-Cu2O NPs
- Table 4 : Antibacterial activities of the PS coatings for Pseudomonas stutzeri B27 bacteria
- Table 5 : Antibacterial activities of the PS coatings for sulfate-reducing bacteriaDOI : https://doi.org/10.1007/s11998-023-00789-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00789-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40173
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Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible Development of an epoxy-based self-intumescent fire protective coating containing an appropriate mass ratio of APP and Cu2O / Chengshou Zhao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
[article]
Titre : Development of an epoxy-based self-intumescent fire protective coating containing an appropriate mass ratio of APP and Cu2O Type de document : texte imprimé Auteurs : Chengshou Zhao, Auteur ; Yisong Jiang, Auteur ; Wang Fu, Auteur ; Zhuangyuan Liu, Auteur ; Siyuan Liu, Auteur ; Huaqiao Peng, Auteur ; Nima Esmaeili, Auteur Année de publication : 2024 Article en page(s) : p. 547-558 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Caractérisation
Epoxydes
Formulation (Génie chimique)
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Métaux -- Revêtements protecteurs
Oxyde de cuivre
Polyphosphate d'ammoniumIndex. décimale : 667.9 Revêtements et enduits Résumé : A novel epoxy-based self-intumescent fire protective coating has been developed by formulating a combination of ammonium polyphosphate (APP) and copper (I) oxide (Cu2O) in epoxy resin (EP). The effects of various combinations on fire protective performance for steel plate were evaluated using a lab-scale simulated big panel test. Formulations with different mass ratios of APP to Cu2O ranging from 10:0 to 2:8 exhibit good fire protective performance for steel plate. While the final equilibrium backside temperature of un-protected steel plate reached 529 °C, it did not exceed 282 °C for the protected plates with 2 mm thick coatings, which is much lower than the failure temperature of steel (ca. 500 °C). The lowest final equilibrium backside temperature of coated steel plate was 234.5 °C for the optimal formulation (EP/24APP/16Cu2O) with an APP/Cu2O mass ratio of 6/4 in EP. Interestingly, the limiting oxygen index (LOI) value (46.8%) for the optimized formulation (EP/24APP/16Cu2O) is not the highest, being lower than those of (EP/40APP/0Cu2O) and (EP/32APP/8Cu2O) formulations. The fire behavior of the optimized formulation (EP/24APP/16Cu2O) and control EP was compared using the cone calorimetry. The main fire hazard parameters such as peak heat release rate, total smoke production and peak CO production for EP/24APP/16Cu2O are reduced by 80.0%, 59.5% and 75.0%, respectively, relative to those for EP. This indicates that the EP/24APP/16Cu2O formulation provides significantly better fire safety than does control EP alone. A possible mode of action for the combination of APP/Cu2O in terms of the expansion ratio and heat insulation degree of the formed intumescent char layer may be proposed. Thus, this work contributed a reference for developing intumescent fire protective coating with high fire safety. Note de contenu : - EXPERIMENTAL : Materials - Coating preparation - Characterization
- RESULTS AND DISCUSSION : Fire protection - Flame retardance - Combustion performance - Possible fire protective action mode
- Table 1 : Formulations of different coatings
- Table 2 : Cone calorimeter parameters of EP and EP/24APP/16Cu2ODOI : https://doi.org/10.1007/s11998-023-00837-9 En ligne : https://drive.google.com/file/d/1ima9p-v-zHkpIR2kHCr_ft89fzeZ3UFm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40776
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Code-barres Cote Support Localisation Section Disponibilité 24736 - Périodique Bibliothèque principale Documentaires Disponible Laser diffraction measurements of pigment size distributions of coatings and mill bases: implications of dilution medium and dispersion process parameters / Shicong Luo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)
[article]
Titre : Laser diffraction measurements of pigment size distributions of coatings and mill bases: implications of dilution medium and dispersion process parameters Type de document : texte imprimé Auteurs : Shicong Luo, Auteur ; Claus Erik Weinell, Auteur ; Søren Kiil, Auteur Année de publication : 2023 Article en page(s) : p. 899-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Broyeurs à billes
Dioxyde de titane
Dispersions et suspensions
Formulation (Génie chimique)
Granulométrie laser
Microscopie
Oxyde de cuivre
Pigments
Polyacryliques
Qualité -- ContrôleIndex. décimale : 667.9 Revêtements et enduits Résumé : Coating properties, such as gloss, rheology, and exterior durability, are strongly affected by the particle size distribution (PSD) of pigment agglomerates. Consequently, moving from the industrial practice of a maximum agglomerate size evaluation after dispersion (i.e., grindometer readings) to an accurate measurement of the entire PSD, holds a promising potential for quality control, product optimization, and research. The aim of the present work was to develop an analysis procedure, based on laser diffraction, for PSD measurements of coatings. In the experiments, acrylic-based TiO2 or Cu2O predispersions (i.e., mill bases), with variations in the composition and dispersion parameters, were investigated. Results show that the laser diffraction measurements are influenced by the so-called obscuration value of the diluted sample, the equipment-input refractive index values, and the shape assumption for the pigment agglomerates. Furthermore, the unavoidable sample dilution, prior to a measurement, strongly affects the stability of primary particles and agglomerates. When using a mixture of the pertinent binder and solvent, as opposed to the pure solvent only, and taking rheology issues into consideration, solvent shock was avoided and reliable PSDs could be obtained. The new analytical procedure was used on selected dispersions with variations in coating formulations and equipment operational parameters and allowed for precise detections of the developments in PSDs and volume-moment mean diameters. In summary, the principle of laser diffraction, with proper control of the measurement conditions, was demonstrated to be a reliable technique for PSD evaluation of coatings and predispersions. Note de contenu : - EXPERIMENTAL : Raw materials - Predispersion systems investigated - Dispersion instruments - Laser diffraction particle size analyzer - Scanning electron microscope (SEM) - Digital microscope - Fineness of grind gauge
- RESULTS AND DISCUSSION : Pigment size measurements with digital microscopy - Pigment size measurements with electron microscopy - Sensitivity analysis of the user-supplied parameters for the laser diffraction method - Particle shape - Comparison between grind gauge and laser diffraction - PSD measurements of TiO2 - Absence of reagglomeration - Effects on the PSD results of formulation and operational parameters - PSD results of Cu2O obtained using the laser diffraction method
- Table 1 : Overview of particle size measuring techniques
- Table 2 : Details of pigments used in the experiments
- Table 3 : Formulation details of predispersions
- Table 4 : Recommended parameters for the laboratory scale high-speed disk disperser
- Table 5 : Selected (present investigation) and recommended parameter values for the lab-scale, high-speed bead mill
- Table 6 : Details of beads used in the lab-scale, high-speed bead mill
- Table 7 : Equivalent spherical diameter of pigment powders, measured using STEM and subsequent image analysis supported by a python code
- Table 8 : Volume-moment mean diameter of TiO2-HS1 sample for four obscuration valuesDOI : https://doi.org/10.1007/s11998-022-00742-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00742-7.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39436
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Code-barres Cote Support Localisation Section Disponibilité 24069 - Périodique Bibliothèque principale Documentaires Disponible Modifying of UHMWPE fishing nets with layer-by-layer deposition method for antifouling properties / Gülsah Ekin kartal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
[article]
Titre : Modifying of UHMWPE fishing nets with layer-by-layer deposition method for antifouling properties Type de document : texte imprimé Auteurs : Gülsah Ekin kartal, Auteur ; Ayse Merih Sarusik, Auteur Année de publication : 2021 Article en page(s) : p. 163-171 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Borate de zinc
Caractérisation
Cationisation
Couches minces multicouches
Filets de pêche
Formation de film
Nanoparticules
Oxyde de cuivre
Oxyde de zinc
Polyéthylène à ultra haut poids moléculaire
Polyéthylèneimine
Revêtement monocouche
Revêtements antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : The nanoparticles-based, multilayer, nanocomposite films ZnO, Cu2O, zinc borate, and Econea® were fabricated on cationized ultra-high molecular weight polyethylene (UHMWPE) fishing nets using a layer-by-layer molecular self-assembly technique. For the cationic surface charge, the UHMWPE fishing nets were pretreated with polyethyleneimine using the dip-coating method. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to examine the nano-ZnO, Cu2O, zinc borate, and Econea® multilayer films deposited on the fishing nets. The fishing nets were placed in a fish farm located in the Aegean Sea for 6 months. The nano-Econea® films exhibited excellent antifouling activity against microorganisms. To evaluate the effect of the process on antifouling properties, physical tests of the nets were conducted before and after the nanoparticle treatment. The strength of the nets and fouling organisms were examined after the field study. Note de contenu : - EXPERIMENTAL : Materials - Cationization process - Nano-multilayer film formation - Characterization
- RESULTS AND DISCUSSION : Characterization - Fieldwork - Macro-organisms analysis - Solidity of nets - Strength and weight analysis
- Table 1 : Percentage of elemental contents of fishing nets deposited with 16-multilayer nanomaterial films
- Table 2 : Solidity of biofouled fishing nets
- Table 3 : Weighting results of fishing nets deposited with 16-multilayer nanomaterial films before and after the field
- Table 4 : Strength and elongation values of fishing nets deposited with 16-multilayer nanomaterial filmsDOI : https://doi.org/10.1007/s11998-020-00392-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00392-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35360
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Code-barres Cote Support Localisation Section Disponibilité 22605 - Périodique Bibliothèque principale Documentaires Disponible Study mechanical properties for polymer composite reinforced by carbon fibers and coppe oxide particles (CuO) used in make prosthetic limb in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 34, N° 1 (02/2024)
PermalinkThe future of anti-fouling coatings / Marco Heuer in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2022)
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