Fluoride detection with a colorimetric and fluorescent dual-mode chemosensor / Chanwoo Song in COLORATION TECHNOLOGY, Vol. 139, N° 4 (08/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 4 (08/2023) . - p. 395-406 Titre : Fluoride detection with a colorimetric and fluorescent dual-mode chemosensor Type de document : texte imprimé Auteurs : Chanwoo Song, Auteur ; Dongkyun Gil, Auteur ; Jae Jun Lee, Auteur ; Sumin Jung, Auteur ; Cheal Kim, Auteur Année de publication : 2023 Article en page(s) : p. 395-406 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques Colorimétrie Composés organiques -- Synthèse Fluorures Produits chimiques -- Détection Index. décimale : 543 Chimie analytique : réactifs, préparations, instruments, méthodes Résumé : We designed a colorimetric and fluorescent dual-mode chemosensor ADM ((E)-2-(((2-amino-4,5-dichlorophenyl)imino)methyl)-6-methoxyphenol) for detecting fluoride (F−). The sensor ADM can detect F− by colour and fluorescence changes. The colour change is from colourless to yellow, and the fluorescence change is a yellow turn-on. With the results of Job plot and electrospray ionisation mass spectrometry, the reaction of F− and ADM turned out to be a 1:1 binding. The detection limits for F− of ADM were 5.00 μM in ultraviolet–visible and 4.16 μM in fluorescence. The detecting process of F− by ADM was demonstrated by ultraviolet–visible and fluorescent titrations, electrospray ionisation mass spectrometry, proton nuclear magnetic resonance titration and theoretical calculations. Note de contenu : - EXPERIMENTAL : General information - Synthesis of sensor ADM - UV–vis and fluorescent titrations - Job plot - 1H NMR titration - UV–vis and fluorescent competition experiments - Density-functional theory and time-dependent density-functional theory calculations RESULTS AND DISCUSSION : Spectroscopic studies of ADM with F− - Quantum calculations - Table 1 : Examples of colorimetric and fluorescent chemosensors for detecting F− DOI : https://doi.org/10.1111/cote.12664 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12664 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39678 [article]

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Investigating the correlation between the curing behavior and properties of acrylic powder coatings / Da Eun Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1039-1052 Titre : Investigating the correlation between the curing behavior and properties of acrylic powder coatings Type de document : texte imprimé Auteurs : Da Eun Lee, Auteur ; Jae Jun Lee, Auteur ; Han-Jung Cho, Auteur ; Jin Seok Lee, Auteur Année de publication : 2023 Article en page(s) : p. 1039-1052 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Calorimétrie Essais (technologie) Polyacryliques Réticulation (polymérisation) Revêtements organiques Revêtements poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic powder coatings are environmentally friendly, solvent-free solid coatings with excellent durability and corrosion resistance that protect substrates from corrosive environments. The curing behavior of acrylic powder coatings affects the coating film properties. In this study, a catalyst was used to control the curing conversion rate, and the curing characteristics and physical properties were compared for coatings with and without the catalyst. Differential scanning calorimetry and an isoconversional method were used to obtain activation energies, and the conversion rate under different isothermal conditions was computed. Notably, complete curing could not be achieved without the catalyst; however, the catalyst-containing coating was entirely cured. With sufficient curing established, the addition of the catalyst was found to increase the adhesion, impact resistance, and corrosion resistance. However, the recoatability was reduced owing to a lack of unreacted monomers on the surface of the catalyst-containing coating film, as verified by Fourier-transform infrared spectroscopy. In general, the addition of a catalyst to acrylic powder coatings enabled complete curing and enhanced most physical properties, offering an improved formulation for applications across high-corrosion environments. Note de contenu : - EXPERIMENTAL METHODS : Sample preparation - Differential scanning calorimetry measurements - Property evaluation - RESULTS AND DISCUSSION : Curing characteristics of acrylic powder coating - Property test results - Table 1 : Composition and content of acrylic powder coating - Table 2 : Adhesion grades - Table 3 : Activation energies, curing times, and glass transition temperatures for various degrees of conversion - Table 4 : Kinetic parameters in the autocatalytic model Property test results - Table 5 Property testing results DOI : https://doi.org/10.1007/s11998-022-00722-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00722-x.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39446 [article]

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A rhodamine B-based colorimetric chemosensor for sensitive and selective detection of Cu2+ : Test strip analysis and density functional theory / Jae Sung Heo in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 4-15 Titre : A rhodamine B-based colorimetric chemosensor for sensitive and selective detection of Cu2+ : Test strip analysis and density functional theory Type de document : texte imprimé Auteurs : Jae Sung Heo, Auteur ; Dongkyun Gil, Auteur ; Jae Jun Lee, Auteur ; Cheal Kim, Auteur Année de publication : 2023 Article en page(s) : p. 4-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Capteurs chimiques Colorimétrie Ions cuivre Rhodamine Index. décimale : 535.6 Couleur Résumé : We designed a rhodamine B-based colorimetric chemosensor BHSO ((Z)-3′,6′-bis(diethylamino)-2-(2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)ethyl)spiro[isoindoline-1,9′-xanthen]-3-one) for detecting Cu2+. In the presence of Cu2+, BHSO caused a colour variation from colourless to bright orange. The limit of detection for Cu2+ towards BHSO was 0.73 μM. The binding of BHSO to Cu2+ was analysed as a 1:1 ratio through a Job plot and electrospray ionisation mass spectrometry. BHSO can detect readily Cu2+ with a test strip by colorimetric variation. The detecting process of Cu2+ by BHSO was represented by ultraviolet-visible titration, electrospray ionisation mass spectrometry, proton nuclear magnetic resonance titration, Job plot and density functional theory calculations. Note de contenu : - EXPERIMENTAL : Materials and equipment - Synthesis of ABSO - Synthesis of BHSO - UV-vis titration of BHSO with Cu2+ - Job plot - 1H NMR titration - Inhibition test - Test strip - Calculations for BHSO and BHSO-Cu2+ - RESULTS AND DISCUSSION : Spectroscopic test of BHSO with Cu2+ - Theoretical calculation - Table 1 : Examples of colorimetric chemosensors for detecting Cu2+ based on rhodamine B derivatives that are linked by ethylenediamine DOI : https://doi.org/10.1111/cote.12633 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12633 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39201 [article]

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