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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 649-654 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 profiles DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12241 [article]

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NMR-measurements for determination of local moisture content of coated wood / Jimmy Johansson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 5 (09/2013) . - p. 601-607 Titre : NMR-measurements for determination of local moisture content of coated wood Type de document : texte imprimé Auteurs : Jimmy Johansson, Auteur ; Åsa Blom, Auteur ; Sergey V. Dvinskikh, Auteur Année de publication : 2013 Article en page(s) : p. 601-607 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Contrôle non destructif Evaluation du risque Humidité -- Mesure Imagerie par résonance magnétique Résonance magnétique nucléaire Index. décimale : 667.9 Revêtements et enduits Résumé : Local increased moisture content (MC) in wood constructions may result in different kinds of mechanical and, especially, biological degrading problems. Therefore, it is of great importance to control the MC of the material. However, there is at present no appropriate method for determining local MC in wood without destroying the product itself. Nondestructive measurements of local MC in wood is significant for the possibility of, for instance, monitoring the in situ MC in wood constructions over time, and thereby predicting potential problems. The nuclear magnetic resonance (NMR) technique has been shown to be valuable for the measurement of MC in wood. In this study, the possibility of utilizing this technique for local MC measurement in wood has been tested on wood samples exposed to water absorption for 72 h. The samples came from three different wood species treated with paint systems available on the market. In the wood samples an artificial “crack” had been created in the paint to introduce an area where the water could easily gain access to the wood. The results show the possibility of using the NMR technique for local MC measurements in wood. The measurement area, however, must be related to the properties of the material. In the case of wood, the measurement spot must be related to the early/latewood proportions. Further, a calibration of the NMR measurement must be made in relation to the expected density variations of the material. Note de contenu : - Samples for moisture profile measurements - Samples for MC calibration - NMR measurements - Experimental DOI : 10.1007/s11998-013-9484-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9484-4.pdf Format de la ressource électronique : PDf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19779 [article]

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