A cyanine-based dual-modal probe for fluorimetric detection of mercury ion and colorimetric sensing of pH / Yanjie Li in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 427-439 Titre : A cyanine-based dual-modal probe for fluorimetric detection of mercury ion and colorimetric sensing of pH Type de document : texte imprimé Auteurs : Yanjie Li, Auteur ; Youguo Qi, Auteur ; Zhenxiang Xu, Auteur ; Yanxi Song, Auteur ; Hongqi Li, Auteur ; Jian Zhang, Auteur ; Junjie Tang, Auteur ; Jun Zhou, Auteur Année de publication : 2022 Article en page(s) : p. 427-439 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Colorimétrie Cyanines Les cyanines sont le nom non systématique d'une famille de marqueurs synthétiques appartenant au groupe des polyméthines. Les cyanines ont de nombreuses utilisations comme marqueurs fluorescents, particulièrement en imagerie biomédicale. Selon la structure, elles couvrent un spectre allant de l'IR à l'UV. Ions mercure pH Produits chimiques -- Détection Sondes fluorescentes Index. décimale : 535.6 Couleur Résumé : A fluorescent probe derived from cyanine-rhodanine conjugate was developed for dual detection of mercury (Hg2+) ion and pH. Addition of Hg2+ ion to the weakly fluorescent probe solution in dimethyl sulphoxide/water (DMSO/H2O, 7:3, v/v) induced discernible colour change and fluorescence enhancement while other metal cations including Li+, Na+, K+, Ag+, Cu2+, Fe2+, Zn2+, Co2+, Ni2+, Mn2+, Sr2+, Ca2+, Mg2+, Al3+, Cr3+ and Fe3+ did not cause obvious change in colour and fluorescence emission. The detection limit of the probe toward Hg2+ ion is 1.61 × 10−7 M. The probe also exhibited remarkable pH-responsive effect. It acts as a dual chromogenic and spectroscopic probe for determining different pH scales over a wide range of pH 1.0–14.0: bright yellow with maximum wavelength (λmax) 416 nm for pH 1.0–2.0, orange with λmax 470 nm for pH 3.0–9.0, and pale yellow with λmax below 400 nm for pH 10.0–14.0. Plausible sensing mechanisms of the probe toward Hg2+ ion and pH have been proposed. Note de contenu : - EXPERIMENTAL : Materials and instruments - Synthesis of probe CY - Measurements of absorption and fluorescence spectra - RESULTS AND DISCUSSION : Preparation of probe CY - Sensing of mercury ions by probe CY - Sensing of pH by probe CY - Table 1 : Performance comparison of fluorescent probes for the detection of mercury (Hg2+) ion - Table 2 : Application of probe CY to determination of mercury (Hg2+) ion concentrations in different water samples DOI : https://doi.org/10.1111/cote.12603 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12603 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37895 [article]

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Preparation and characterization of polyacrylate composite and its application in superhydrophobic coating based on silicone-modified ZnO / Changpo Ma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 415-433 Titre : Preparation and characterization of polyacrylate composite and its application in superhydrophobic coating based on silicone-modified ZnO Type de document : texte imprimé Auteurs : Changpo Ma, Auteur ; Yongzan Li, Auteur ; Jian Zhang, Auteur ; Feng Ning, Auteur ; Minxia Kang, Auteur ; Hui Li, Auteur ; Zumin Qiu, Auteur Année de publication : 2021 Article en page(s) : p. 415-433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Emulsions Hydrophobie Nanoparticules Oxyde de zinc Polyacrylates Revêtements organiques Rugosité Silicones Les 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). Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, a kind of silicone containing double bond and hydrogen bond has been synthesized via telomerization. In order to disperse and incorporate ZnO into the polymer matrix, ZnO was modified with silicone. Finally, ZnO/polyacrylate and silicone/polyacrylate composites were prepared using modified ZnO and silicone. The present study reports synthesis and characterization of ZnO/polyacrylate and silicone/polyacrylate nanocomposites by in situ emulsion polymerization. The effects of ZnO and silicone on the morphological structure and thermal properties of composites were systematically studied. The composites were characterized using FTIR, XRD, SEM, TEM, TGA, particle size analysis, UV, and WCA. It could be seen that the thermal degradation temperature of the composites increased significantly with the addition of ZnO and silicone. SEM analysis showed that the films were evenly distributed with the surface-modified ZnO nanoparticles. Then, the modified ZnO/polyacrylate superhydrophobic composite coating was prepared using modified ZnO and silicone/polyacrylate emulsion. The coating has excellent self-cleaning and oil–water separation properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of a silicone containing double bond and hydrosilane bond - Preparation of silicone-modified ZnO nanoparticles - Preparation of ZnO/polyacrylate nanocomposite emulsion - Preparation of silicone/polyacrylate nanocomposite emulsion - Preparation of modified ZnO/polyacrylate superhydrophobic composite coating - Characterization - RESULTS AND DISCUSSION : FTIR analysis - XRD analysis - SEM analysis - TEM analysis - TG analysis - Particle size distribution - UV resistance - Water contact angle and water absorption - APPLICATION OF MODIFIED ZNO/POLYACRYLATE SUPERHYDROPHOBIC COMPOSITE COATING : The microstructure of the coating - Stability of superhydrophobic coating - Application of superhydrophobic coating - Scheme 1 : Preparation of a silicone containing double bond and hydrosilane bond - Scheme 2 : Preparation of silicone-modified ZnO nanoparticles - Scheme 3 : Preparation of ZnO/polyacrylate nanocomposite emulsion - Scheme 4 : Preparation process of superhydrophobic coating - Table 1 : General recipe for preparation of ZnO/polyacrylate nanocomposite emulsion - Table 2 : General recipe for preparation of silicone/polyacrylate nanocomposite emulsion - Table 3 : Thermogravimetric parameters of polyacrylate - Table 4 : The GPC of polyacrylate - Table 5 : Roughness parameters of samples DOI : https://doi.org/10.1007/s11998-020-00411-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00411-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35604 [article]

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