Observation of sessile droplet freezing on textured micropillar surfaces via visualization and thermography / Yuan Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 869-879 Titre : Observation of sessile droplet freezing on textured micropillar surfaces via visualization and thermography Type de document : texte imprimé Auteurs : Yuan Wang, Auteur ; Zhen-Guo Wang, Auteur Année de publication : 2019 Article en page(s) : p. 869-879 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Congélation Gouttelettes Hydrophobie Interfaces solide-liquide Mouillage (chimie des surfaces) Surfaces (Physique) Température Thermographie Topographie Index. décimale : 667.9 Revêtements et enduits Résumé : Sessile droplet freezing on textured micropillar surfaces was observed visually and thermographically. Hydrophobic surfaces with three different topographies were selected, the contact angles of water on which were 141°, 102°, and 138°. Droplet surface temperature distribution measurements from lateral view enabled quantitative evaluation of the freezing stages. According to the experiment, it was found that the surface hydrophobicity decreases with the increasing pillar distance. Only a slight increase in hydrophobicity was found with the decreasing pillar diameter. The liquid water droplet experienced five successive stages to become fully frozen. It was also confirmed that the droplet’s opaque appearance is caused by the sudden ice shell formation at the ice incipience. Besides, the solidification frontier (SF) movement inside the droplet was analyzed. The freezing rate was higher at the SF edge. Moreover, the textured surfaces with higher hydrophobicity were prone to further postpone the droplet’s freezing onset. However, surface topography showed minor impact on the droplet surface recalescence stage duration. Additionally, the droplet internal solidification stage lasted longer on samples with higher hydrophobicity. Note de contenu : - DESCRIPTION OF THE EXPERIMENT : Apparatus and methods - Textured micropillar surfaces - DATA REDUCTION AND UNCERTAINTY ANALYSIS : Wetting models - Uncertainty analysis - RESULTS AND DISCUSSION : Effect of surface topography on wettability - Interfacial behaviors during droplet freezing - Droplet surface temperatures and freezing stage classifications DOI : 10.1007/s11998-018-00163-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00163-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32598 [article]

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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]  inCOLORATION TECHNOLOGY > Vol. 138, N° 2 (04/2022) . - p. 157-167 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 fluorescentes Index. 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37846 [article]

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