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A tunable controlled-release urea fertilizer coated with a biodegradable polyurethane-nanoclay composite layer / Kannika Sitthisuwannakul in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
[article]
Titre : A tunable controlled-release urea fertilizer coated with a biodegradable polyurethane-nanoclay composite layer Type de document : texte imprimé Auteurs : Kannika Sitthisuwannakul, Auteur ; Kanittha Kamonchaivanich, Auteur ; Thanakorn Wirunmongkol, Auteur ; Pennapa Muthitamongkol, Auteur ; Wiyong Kangwansupamonkon, Auteur Année de publication : 2023 Article en page(s) : p. 635-646 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Argile
Biodégradation
Caractérisation
Coefficient de diffusionUn coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick.
Engrais organiques
Nanoparticules
Polyuréthanes
Revêtements -- Propriétés chimiques
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiques
Système de libération contrôlée (technologie)
UréeIndex. décimale : 667.9 Revêtements et enduits Résumé : To minimize a loss of urea to the environment and also control a release activity, a tunable and controlled-release urea fertilizer (TCRF) was created. Composite coating layers of the TCRF were synthesized using a composite of nanoclay (B27), and a linseed oil-modified polyurethane resin (BURNOCK® UL65). The concentration of B27 nanoclay was varied from 0, 3, 5 and 10 wt% and called TCRF, TCRF-3, TCRF-5 and TCRF-10, respectively. Firstly, nanocomposite free-standing films (NFs) with 0, 0.5, 1, 3, 5 and 10 wt% of B27 were synthesized and tested to demonstrate the mechanical properties of the coating layer. When the B27 clay content increased, the Young’s modulus and yield strength were increased. On the other hand, the elongation at break was decreased. NFs were also characterized by XRD and TEM, which showed a partial exfoliated nanocomposite character. The water contact angle measurement showed that all NFs had hydrophobicity properties (87°–90° contact angle). Moreover, the microorganism degradability test showed that the NFs degraded at 37 ± 2°C and 58 ± 2°C in manure, a common agriculture media. The study on coated urea fertilizers found that the thickness of all TCRFs layers is around 52–54 μm. The nitrogen release profiles of the TCRF at 60°C in water as a predictive analytic model were investigated using an elemental analyzer that is a pathway analysis method to understand the release profiles of the TCRFs. All release profiles fitted well with the sigmoidal model, which was suitable for a common plant growth. The profiles gave diffusion coefficients (D) in the range of 49–69 μm2 h−1 and presented an inverse trend to the yield strength of the NFs. The investigation demonstrated that B27 played an important role in tuning the strength of the coating layers that affected the urea release to the plants and the environment. Note de contenu : - MATERIALS AND METHODS : Chemicals - Nanocomposite free-standing films (NFS) preparation - Biodegradability analysis of the NF - Tunable controlled-release urea fertilizer (TCRF) preparation - Characterizations - Nitrogen release test and kinetic study of TCRF
- RESULTS AND DISCUSSION : Swelling performance and the characteristics of the nanoclays - Chemical and physical properties of the NF - Biodegradable ability - Nitrogen release mechanism
- Table 1 : Mechanical properties and contact angles of NF nanocomposite films
- Table 2 : The percentages of biodegradation via the conversion yield of carbon in the sample to carbon dioxide according to the ASTM 5338–98 test method
- Table 3 : Kinetic parameters and diffusion coefficients of various types of TCRFDOI : https://doi.org/10.1007/s11998-022-00688-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00688-w.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39308
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Code-barres Cote Support Localisation Section Disponibilité 24056 - Périodique Bibliothèque principale Documentaires Disponible Ultrasonic nebulization-assisted layer-by-layer assembly for spray coating of multilayered, multicomponent, bioactive nanostructures / Skylar S. Stewart-Clark in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)
[article]
Titre : Ultrasonic nebulization-assisted layer-by-layer assembly for spray coating of multilayered, multicomponent, bioactive nanostructures Type de document : texte imprimé Auteurs : Skylar S. Stewart-Clark, Auteur ; Yuri M. Lvov, Auteur ; David K. Mills, Auteur Année de publication : 2011 Article en page(s) : p. 275-281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Assemblages (technologie)
Dexaméthasone
Dioxyde de titane
Nanoparticules
Pulvérisation cathodique
Revêtements multicouchesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, we describe a new technique for creating dense, stable, nanolayer coatings on solid substrates using ultrasonic nebulization. Nebulization-assisted layer-by-layer assembly (LbL) is a modification to the well-characterized LbL assembly method. The conventional method of producing electrostatically assembled multilayer films through sequential substrate dipping was compared to the nebulization method, and the resultant film characteristics were investigated. Varied coatings can be generated according to the alterations in deposition parameters, with the most influential being nebulizer distance and time. In addition to employment of polyelectrolytes (PEs), the nebulization method has been extrapolated to generate assemblies containing nanoparticles and a model drug, dexamethasone. It is shown that in comparison with conventional LbL, similar bilayers’ layering thicknesses can be achieved within a much smaller timeframe. Furthermore, PEs and more complex protein and nanoparticle assemblies can be incorporated to influence the surface topography and functionality. The potential to expeditiously assemble multicomponent films has far-reaching implications in many focus areas. Note de contenu : - MATERIALS AND METHODS : Preparation of PE, nanoparticle, protein, and drug solutions - Fabrication of multilayered substrates - Materials characterization.
- RESULTS AND DISCUSSION : LbL netulized thin films functionalized with TiO2 and DEX (surface charge monitoring by ζ-potential - QCM studies - AFM study of film assembly.DOI : 10.1007/s11998-010-9304-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9304-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11429
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Code-barres Cote Support Localisation Section Disponibilité 012999 - Périodique Bibliothèque principale Documentaires Disponible Ultrasonication for better pigment dispersion / Ashwani Upadhyay in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)
[article]
Titre : Ultrasonication for better pigment dispersion Type de document : texte imprimé Auteurs : Ashwani Upadhyay, Auteur ; Shaifali Tyagi, Auteur Année de publication : 2017 Article en page(s) : p. 71-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cavitation
Dioxyde de titane
Dispersions et suspensions
Nanoparticules
Noir de carbone
Pigments
Polymères
Revêtements:Peinture
UltrasonsIndex. décimale : 667.2 Colorants et pigments Résumé : In paint industries one of the biggest challenges in the manufacturing process is to disperse nanoparticles into the vehicle, only the wel I separated nanoparticles can lead to unique new properties of the composite I ike a simultaneous improvement of toughness and stiffness already at very low filler contents. These particles are held together by attraction forces of various physical and chemical nature, including Van der Waals forces and liquid surface tension. This effect is stronger for higher viscosity liquids, such as polymers or resins. Different technologies are commonly used for the dispersing of powders into liquids. This includes high pressure homogenizers, agitator bead mills, impinging jet mills and rotor-stator-mixers. Another possibility is the dispersion by the help of ultrasonic waves. When sonicating liquids the sound waves that propagate into the liquid media result in alternating high-pressure and low-pressure cycles. This applies mechanical stress on the attracting electrostatic forces. Such jets press liquid at high pressure between the particles and separate them from each other. This review article discusses the use of ultrasonic waves in pigment dispersion, mechanism, and its application in paint industries. Note de contenu : - ULTRASONIC
- ULTRASONIC CAVITATIONS : Type of cavitations - Collapse of transient cavities
- ULTRASONIC DISPERSION EQUIPMENTS : Specifications : Lab ultrasonifictors instruments - The QS1 system - Titanium probes - The QS4 system - Titanium probes - Working - Factors affecting ultrasonication - Amplitude - Vapor pressure - Temperature - Viscosity and concentration - Power and intensity vs. energy - Surface tension - Air and gas content
- DEMONSTRATION OF ULTRASONIC MILLING AND DISPERSING EFFECTS BY MEANS OF SPECIFIC MATERIAL EXAMPLES : Titanium dioxide - Dispersion of nonmaterial's in polymers - Ultrasonic dispersion as compared to normal dispersion has following featuresEn ligne : https://drive.google.com/file/d/1AZbzkH87HvkQ15xmlsrYYQwsEH3elD51/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28980
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Code-barres Cote Support Localisation Section Disponibilité 19145 - Périodique Bibliothèque principale Documentaires Disponible Uniform silver nanoparticles coating using dual regime spray deposition system for superhydrophilic and antifogging applications / Maxym V. Rukosuyev in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)
[article]
Titre : Uniform silver nanoparticles coating using dual regime spray deposition system for superhydrophilic and antifogging applications Type de document : texte imprimé Auteurs : Maxym V. Rukosuyev, Auteur ; Ahmad Esmaeilirad, Auteur ; Syed A. Baqar, Auteur ; Martin B. G. Jun, Auteur Année de publication : 2017 Article en page(s) : p. 347-354 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argent
Dépôt par pulvérisation
Hydrophilie
Nanoparticules
Revêtements anti-buée:Peinture anti-buéeIndex. décimale : 667.9 Revêtements et enduits Résumé : Antifogging and/or superhydrophilic properties of coatings are widely exploited both in a laboratory environment and in industrial applications. Material choice for the production of the coatings is of vital importance for the final coating properties. Silver nanoparticles have been known to have antibacterial and fungicidal properties, which make them extremely useful in biomedical applications. Production of coatings that combine superhydrophilic and the unique properties of silver nanoparticles can be beneficial in numerous applications. Dual regime spray coating system allows for the production of a thin, uniformly distributed nanoparticle coating through droplet impact velocity and gas flow control. Silver nanoparticles of ~15 nm average diameter were synthesized and coated onto the glass substrate, which produced the top layer with strong superhydrophilic/antifogging properties with water contact angles of close to 6°. In addition, coated surfaces exhibited an increase in light transmission of ~0.7% in the 500–700 nm range. Note de contenu : - MATERIALS
- DUAL REGIME SPRAY SYSTEM FOR COATING
- RESULTS : Coating characterization - Superhydrophilic propertiesDOI : 10.1007/s11998-016-9852-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9852-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28150
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Code-barres Cote Support Localisation Section Disponibilité 18781 - Périodique Bibliothèque principale Documentaires Disponible Unsaturated polyester-nanoclay nanocomposite coatings for effective corrosion protection of steel / Fekri Laatar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)
[article]
Titre : Unsaturated polyester-nanoclay nanocomposite coatings for effective corrosion protection of steel Type de document : texte imprimé Auteurs : Fekri Laatar, Auteur ; Manuvel Jayan, Auteur ; Predeep Padmanabhan, Auteur ; Mohamed Ramzi Ben Romdhane, Auteur ; Ezzeddine Srasra, Auteur Année de publication : 2018 Article en page(s) : p. 293-301 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable
Anticorrosifs
Anticorrosion
Métaux -- Revêtements protecteurs
Montmorillonite
Nanoparticules
Polyesters insaturésLes résines de polyesters insaturés (UP) sont obtenues par polycondensation
d’un ou de plusieurs diacides avec un ou plusieurs glycols, l’un, au moins, des constituants contenant une double liaison éthylénique susceptible de réagir ultérieurement sur un composé vinylique, acrylique ou allylique.
Par le terme résine polyester, on désigne en fait la dissolution du prépolymère polyester insaturé dans un solvant copolymérisable, le plus utilisé étant le styrène. C’est sous cette forme liquide que les résines polyesters sont livrées aux transformateurs.
Après addition de différents adjuvants, charges et renforts, divers procédés de transformation provoquent, sous l’action d’un système catalytique approprié, la copolymérisation finale de la résine en un objet thermodurcissable.
Les polyesters insaturés sont d’un usage relativement ancien (1950), essentiellement
dans le bâtiment (moulage au contact). Ils ont connu un renouveau important à partir de 1980, en particulier au niveau des formulations et de la fiabilité des procédés grâce au développement de technologies industrielles de moulage par injection et par compression dans l’industrie automobile.
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polymeric composites are widely used to control the corrosion of metal surfaces. Various types of polymer nanocomposites provide better corrosion protection than the neat resins. This paper aims at reviewing some of the protective properties of Tunisian clay (montmorillonite-MMT)/unsaturated polyester (UP/MMT) in 3.5% NaCl. The spin coating technique is applied on metals deposited on a stainless steel surface. The samples are characterized with XRD, TEM and SEM methods. The corrosion performance was estimated by using open circuit potential, polarization measurements and electrochemical impedance spectroscopy. The UP/OMMT nanocomposites showed the best corrosion protection performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of unsaturated polyester based nanocomposites - Characterization of nanocomposite - Corrosion studies
- RESULTS AND DISCUSSION : X-ray diffraction analysis - TEM study - Corrosion study - SEM studyDOI : 10.1007/s11998-017-9977-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9977-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30283
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