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Molecular imprinting of cellulose cotton fabric/silica materials with a colorimetric dithizone chelation for smartphone-based detection of Zn (II) ions in water samples / Lita Chheang in COLORATION TECHNOLOGY, Vol. 140, N° 4 (08/2024)
[article]
Titre : Molecular imprinting of cellulose cotton fabric/silica materials with a colorimetric dithizone chelation for smartphone-based detection of Zn (II) ions in water samples Type de document : texte imprimé Auteurs : Lita Chheang, Auteur ; Tongchai Sriwiriyarat, Auteur ; Sudtida Pliankarom Thanasupsin, Auteur ; Nisakorn Thongkon, Auteur Année de publication : 2024 Article en page(s) : p. 637-652 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques
Caractérisation
CotonLe coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles).
Dithizone
Eau -- Analyse
Impression moléculaire
Ions zinc
Métaux lourds
Polluants
Produits chimiques -- Détection
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
TétraéthoxysilaneIndex. décimale : 677.4 Textiles artificiels Résumé : Molecularly imprinted materials based on imprinting dithizone-Zn (II) (DTZ-Zn (II)) complexes onto cotton fabric/silica, and the Color Grab application for the OPPO A54 smartphone, were proposed and applied for the first time to detect Zn (II) ions in water samples. The proposed materials were prepared by using cotton fabrics as cellulosic materials, tetraethoxysilane as silica sources and DTZ-Zn (II) as template molecules. The initial concentration of DTZ and Zn (II), the volume of tetraethoxysilane and the reaction time were optimised to obtain the maximum adsorption of the DTZ-Zn (II) complexes in the imprinted materials. The concentration of hydrochloric acid and the extraction time were optimised to obtain the maximum Zn (II) removal. The results found that 10 mL of a solution containing DTZ (0.20 mM) and Zn (II) (0.30 mM), 25 μL of tetraethoxysilane, with 10 minutes reaction time, exhibited the strongest binding of the template complexes. Zn (II) ions were selectively removed from the materials by using 0.1 M hydrochloric acid for 10 minutes. The morphology of the prepared materials was characterised by scanning electron microscopy–energy-dispersive X-ray spectroscopy and attenuated total reflectance–Fourier Transform-infrared spectroscopy. The smartphone measurement based the cotton fabric/silica materials exhibited linear relationship between saturation (%) and Zn (II) concentrations in the range of 0.1 to 1.0 mg/L, with limit of detection of 0.02 mg/L and limit of quantification of 0.06 mg/L. The proposed method was successfully applied to determine Zn (II) in real-water samples with the % recovery ranging from 98% to 115% and an acceptable relative standard deviation of less than 6 (n = 3). Note de contenu : - EXPERIMENTAL : Chemicals and materials - Analytical instruments - Methods
- RESULTS AND DISCUSSION : Preparation of the CF/silica/DTZ for detection of Zn (II) ions - Characterisation of the imprinted materials using scanning electron microscopy–energy-dispersive X-ray spectroscopy and FTIR - Interference study - Reusability and stability of the CF/silica/DTZ - Detection of Zn (II) ions from an aqueous solution using the CF/silica/DTZ and smartphone detection - Detection of Zn (II) ions in water samplesDOI : https://doi.org/10.1111/cote.12736 En ligne : https://drive.google.com/file/d/1JE50jcLKKTln2nwGMUVe68aJvVck368h/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41324
in COLORATION TECHNOLOGY > Vol. 140, N° 4 (08/2024) . - p. 637-652[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24746 - Périodique Bibliothèque principale Documentaires Disponible Polyacrylic acid (PAA)/Zn2+ complex films fabricated on steel substrate via one-step assembly for corrosion protection / Ru Yan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)
[article]
Titre : Polyacrylic acid (PAA)/Zn2+ complex films fabricated on steel substrate via one-step assembly for corrosion protection Type de document : texte imprimé Auteurs : Ru Yan, Auteur ; Xiang Gao, Auteur ; Wei He, Auteur ; Yan Wang, Auteur ; Houyi Ma, Auteur Année de publication : 2024 Article en page(s) : p. 267-280 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique
AcierL'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.
Adhésion
Anticorrosifs
Anticorrosion
Complexation (chimie)
Ions zinc
Métaux -- Revêtements protecteurs
Revêtement de conversionIndex. décimale : 667.9 Revêtements et enduits Résumé : The eco-friendly PAA/Zn2+ conversion coatings, composed of PAA-Zn2+ complex and ZnO/Zn(OH)2, have been prepared by taking advantage of coordination-driven assembly method for suppressing steel corrosion. Because of high affinity of PAA for steel surface and various metal ions, metal ions-assisted organic molecule assembly strategy used to construct chemical conversion film on metal surface has been extended to the design and construction of polyelectrolyte–metal complex conversion coating. In this work, some film properties associated closely with film formation time containing corrosion resistance, surface microstructures, and chemical compositions were carefully investigated by using electrochemical measurements, morphologies tests, and spectra analysis and possible film-forming mechanism of PAA/Zn2+ film was proposed. The highest charge transfer resistance (Rct = 24,960 ohm cm2) was recorded for PAA/Zn2+ film based on EIS, which is about 30 times higher than that of the bare steel. And minimum corrosion current density (icorr = 1.01 × 10-7 A cm-2) was obtained for PAA/Zn2+ film from polarization curves, which is only 3.34% of that obtained from bare steel. Herein, the PAA/Zn2+ conversion coatings constructed between 30 and 60 min present outstanding corrosion resistance performance and the protection efficiencies are greater than 90%. Furthermore, PAA/Zn2+ films have a positive effect on improvement in adhesion of epoxy coating on steel surface, which can further improve corrosion resistance of whole paint system, especially for PAA/Zn2+ films fabricated for long film formation time (e.g., 30 min and 45 min). Due to environmental friendliness, strong corrosion resistance, and good adhesion performance, PAA/Zn2+ conversion coatings are expected to be an ideal substitute for the traditional chromating process. Note de contenu : - EXPERIMENTAL : Materials and chemical reagents - Chemical conversion treatment - Epoxy primer treatment - Anticorrosion performance evaluation - Surface observation and analysis
- RESULTS AND DISCUSSION : Corrosion resistance of PAA/Zn2+ conversion films - EIS tests - Polarization curves - Surface characterization - SEM and EDS analysis - Corrosion protection performance of paint system
- Table 1 : Electrochemical parameters of naked steel and steel covered by PAA/Zn2+ films determined from EIS measurements
- Table 2 : Corrosion electrochemical parameters for the naked steel and the modified steel by PAA/Zn2+ films in 3.5 wt% NaCl solutionDOI : https://doi.org/10.1007/s11998-023-00818-y En ligne : https://drive.google.com/file/d/1nO0pvQ-ysQZzdu6BQbZUTdvFu7SoQlN1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40446
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 267-280[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24443 - Périodique Bibliothèque principale Documentaires Disponible 24735 - Périodique Bibliothèque principale Documentaires Disponible Thiocarbazone-appended coumarin : An easily accessible ratiometric fluorescent chemosensor for multianalyte (Zn2+ and Cu2+) systems / Mu-Xuan Lv in COLORATION TECHNOLOGY, Vol. 138, N° 2 (04/2022)
[article]
Titre : Thiocarbazone-appended coumarin : An easily accessible ratiometric fluorescent chemosensor for multianalyte (Zn2+ and Cu2+) systems Type de document : texte imprimé Auteurs : Mu-Xuan Lv, Auteur ; Lin-Yan Bian, Auteur ; Wei-Na Wu, Auteur ; Zhi-Hong Xu, Auteur ; Yuan Wang, Auteur ; Xiao-Lei Zhao, Auteur ; Zhou-Qing Xu, Auteur ; Yun-Chang Fan, Auteur ; Ling-Ling Yan, Auteur Année de publication : 2022 Article en page(s) : p. 157-167 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques
Composés organiques -- Synthèse
Coumarine -- Composés
Fluorescence
Ions cuivre
Ions zinc
Sondes fluorescentesIndex. décimale : 667.2 Colorants et pigments Résumé : A simple thiocarbazone-appended coumarin derivative 1 with high selectivity as a ratiometric fluorescence sensor towards Cu2+ and Zn2+ in a semi-aqueous solution was synthesised and characterised. Upon the addition of Cu2+ and Zn2+, the emission of 1 solution undergoes a blue and red shift to 480 and 545 nm according to the intense blue and yellow colour under a 365-nm ultraviolet lamp, respectively. Binding was confirmed by ultraviolet-visible absorption analysis, fluorescence measurement, mass spectrometry, proton nuclear magnetic resonance, Fourier Transform-infrared spectroscopy and density functional theory calculation. The results show that 1 coordinated with Cu2+ and Zn2+ in different modes, resulting in different ratiometric fluorescence responses. The detection limits of the sensor 1 for Cu2+ and Zn2+ were 100.8 and 11.5 nM, respectively. The association constants (Ka) of Cu2+ and Zn2+ with 1 were determined to be 5.59 × 104 and 5.08 × 104 M−1, respectively. Fluorescent microscopy experiments demonstrated that probe 1 has the potential to be used to monitor Zn2+ and Cu2+ in living cells. Note de contenu : - EXPERIMENTAL : Materials and instrumentation - General ultraviolet-visible and fluorescence spectra measurements - Tynthesis of 1
- RESULTS AND DISCUSSION : Fluorescent selectivity of 1 to Cu2+/Zn2+ - Investigation of the sensing mechanism - Detection of Cu2+ and Zn2+ in water samples - Fluorescence imaging of intercellular Cu2+ and Zn2+
- Table 1 : Some coumarin-containing fluorescent probes for Cu2+ or Zn2+ in the past few years
- Table 2 : Determination of CU2+/Zn2+ in water samples (n = 3)DOI : https://doi.org/10.1111/cote.12579 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12579 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37846
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Code-barres Cote Support Localisation Section Disponibilité 23518 - Périodique Bibliothèque principale Documentaires Disponible