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Assessment of moisture protective properties of wood coatings by a portable NMR sensor / Payam Pourmand in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
[article]
Titre : Assessment of moisture protective properties of wood coatings by a portable NMR sensor Type de document : texte imprimé Auteurs : Payam Pourmand, Auteur ; Lin Wang, Auteur ; Sergey V. Dvinskikh, Auteur Année de publication : 2011 Article en page(s) : p. 649-654 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Tags : 'Revêtement bois' Bois Durabilité 'Résonance magnétique nucléaire' 'Aimant portatif permanent' Index. décimale : 667.9 Revêtements et enduits Résumé : We have evaluated the potential of nuclear magnetic resonance (NMR) spectroscopy based on small portable magnets for in situ assessment of moisture protective properties of wood coatings. Low field 1H NMR with a unilateral permanent magnet was used to monitor and map the local moisture content (MC) of wood specimens uncoated or coated with various types of commercial paint systems. The MC beneath a coating layer was measured with a penetration depth up to 5 mm and with a depth resolution of 0.2 mm. The method is quick, noninvasive, simple to perform, and does not require removing wooden parts from the structure. Note de contenu : EXPERIMENTAL : Materials - NMR measurements
RESULTS AND DISCUSSION : Moisture content calibration - Moisture content profilesDOI : 10.1007/s11998-011-9348-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9348-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12241
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 649-654[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13360 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and characterisation of benzothiazole-based solid-state fluorescent azo dyes / Ganapati S. Shankarling in COLORATION TECHNOLOGY, Vol. 126, N° 6 (2010)
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Titre : Synthesis and characterisation of benzothiazole-based solid-state fluorescent azo dyes Type de document : texte imprimé Auteurs : Ganapati S. Shankarling, Auteur ; Rajkumar N. Rajule, Auteur ; Yogesh A. Sonawane, Auteur ; Prakhar P. Kasture, Auteur Année de publication : 2010 Article en page(s) : p. 348-352 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Benzothiazoles
Caractérisation
Chimie analytique
Chimie textile
Colorants
Colorants -- Synthèse
Fibres polyesters
Solubilité
Solvants organiques
Teinture -- Fibres textilesTags : 'Teintures azotées fluorescentes à semi-conducteur' 'Solvant organique' Colorant Caractérisation Solubilité 'Coefficient d'extinction molaire' Dichlorométhane Chloroforme Diméthylformamide Tétrahydrofurane 'Sulfoxyde diméthylique' Polyester 'Teinture de dispersion' Thermogravimétrie 'Résonance magnétique proton' 'Spectrométrie masse' Stabilité thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : Novel solid-state fluorescent azo dyes containing a 2-[4-(dimethylamino)phenyl]benzo[d]thiazol-6-amine as the electron donor group were synthesised. These dyes showed a molar extinction coefficient in the range of 20 000–30 000 l/mol/cm. These compounds were characterised by strong solid-state fluorescence under long ultraviolet light (365 nm). Absorption and fluorescence spectra revealed that electron coupling originating from broad π-electron delocalisation and the keto–enol form is responsible for the large Stokes shift. These dyes were readily soluble in common solvents such as dichloromethane, chloroform, dimethyl formamide, tetrahydrofuran and dimethyl sulphoxide and were characterised by means of elemental analysis, proton nuclear magnetic resonance and mass spectrometry. Thermogravimetric analysis of solid-state fluorescent dyes show thermal stability up to 270 °C and can therefore be used for polymer application. The coloristic properties of these dyes were evaluated on polyester by the disperse dyeing method. DOI : 10.1111/j.1478-4408.2010.00268.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00268.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10246
in COLORATION TECHNOLOGY > Vol. 126, N° 6 (2010) . - p. 348-352[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012590 - Périodique Bibliothèque principale Documentaires Disponible Use of associating polymers as multifunctional thickeners : studies of Their structure in aqueous solutions via nmr, qels, fluorescence, And rheology measurements / Katsunori Yoshida in IFSCC MAGAZINE, Vol. 10, N° 1 (01-02/2007)
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Titre : Use of associating polymers as multifunctional thickeners : studies of Their structure in aqueous solutions via nmr, qels, fluorescence, And rheology measurements Type de document : texte imprimé Auteurs : Katsunori Yoshida, Auteur ; Ayano Nakaruma, Auteur ; Yuki Nakajima, Auteur ; Tadao Fukuhara, Auteur ; Haruhiko Inoue, Auteur ; Isamu Kaneda, Auteur Année de publication : 2007 Article en page(s) : p. 35-39 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Epaississant Viscosité 'Polymère associé' 'Résonance magnétique nuclaire (RMN)Qels Fluorescence Rhéologie Index. décimale : 668.5 Parfums et cosmétiques Résumé : The solution properties of an associating polymer were studied by NMR, quasi-elastic light scattering (QELS), fluorescence, and rheology measurements. An associative thickening (AT) polymer was designed having a nonionic poly(ethylene oxide) backbone with long alkyl chains at both ends to achieve high viscosity even at relatively high salt concentrations and over a wide pH range. This study focuses on the associative state of the polymer in aqueous solutions at various polymer concentrations. In a fluorescence probe study using pyrene a spectral change in the I3/I1 ratio was observed for pyrene at a polymer concentration (Cp) of 3 x 10-4%, indicating an apparent critical concentration (cmc) of the amphiphilic polymer. The viscosity, self-diffusion coefficient (Dsel), and hydrodynamic size (Rh) distribution measurements at various Cp all suggest that there is a second transition at Cp≅ 0.4%. Although we observed the discontinuity in viscosity, Dsel, and Rh at Cp≅ 0.4%, no changes in the relaxation times (T1 and T2) were recognized for either the alkyl chain or the ethylene oxide moiety of the polymer at C p= 0.1–1%. These data suggest that there are no structural changes or phase transitions at Cp≅ 0.4%, but that intermicellar networks are presumably formed by bridging of the end alkyl groups of the polymer, which is driven by hydrophobic forces. Because the polymer forms networks by hydrophobic interaction and the polymer itself is nonionic, the viscosity of the polymer solution was influenced very little by either the addition of salt or a pH change, as would be expected. The dynamic viscoelastic study revealed that the polymer solution exhibits a single mode Maxwell type relaxation behavior with a terminal relaxation time of about 0.61 s, which imparts a unique flow appearance to the polymer solutions. The time course measurements of the dynamic elastic modulus of the stratum corneum revealed that the polymer has excellent potential for skin softening. It was concluded that the associative thickening polymer not only is a useful thickener with a salt and pH tolerance but also has beneficial skincare effects. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10427
in IFSCC MAGAZINE > Vol. 10, N° 1 (01-02/2007) . - p. 35-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007646 - Périodique Bibliothèque principale Documentaires Disponible