Microscale Physical and Mechanical Analyses of Distemper Paint : A Case Study of Eidsborg Stave Church, Norway in Studies in conservation, Vol.68 N°1-2(2023; January-February) (2023-01-01)

Public ISBD [article]  inStudies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 54-67 Titre : Microscale Physical and Mechanical Analyses of Distemper Paint : A Case Study of Eidsborg Stave Church, Norway Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 54-67 Note générale : Article en libre accès (open access). https://www.tandfonline.com/doi/full/10.1080/00393630.2021.1925487 Langues : Anglais (eng) Catégories : Adsorption Analyse quantitative (chimie) Art -- Matériaux -- Conservation et restauration Craie Détrempe (peinture) -- Analyse Maquettes (sculpture) Microtomographie Nanoindentation Pigments -- Analyse Vapeur, Technique de la Mots-clés : Concentration pigmentaire volumique (CPV)  Sorption Dynamique de Vapeur d'eau (DVS) Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : This study focuses on the use of micro-sensitive methods – nanoindentation, dynamic water vapour sorption, and X-ray microtomography – to examine the physical properties of small volumes of artists’ materials. The novel methodology proposed in this paper was tested on laboratory-prepared chalk-based ground samples and subsequently applied to distemper paint samples taken from the polychrome walls of Eidsborg stave church. This article discusses key parameters that can be used to inform macro-sized mock-ups mimicking physical and mechanical behaviour of artistic materials, and highlights limitations of such an approach for highly heterogeneous paint systems. Dynamic water vapour sorption measurements allowed determination of the pigment volume concentration (PVC) of distemper paint from Eidsborg stave church as 95%. To the authors’ knowledge, this represents the first assessment of PVC for historic distemper paint using a non-destructive experimental technique, which can be extended to other hygroscopic samples of known composition. [article] Microscale Physical and Mechanical Analyses of Distemper Paint : A Case Study of Eidsborg Stave Church, Norway [texte imprimé] . - 2023 . - P. 54-67. Article en libre accès (open access). https://www.tandfonline.com/doi/full/10.1080/00393630.2021.1925487 Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 54-67 Catégories : Adsorption Analyse quantitative (chimie) Art -- Matériaux -- Conservation et restauration Craie Détrempe (peinture) -- Analyse Maquettes (sculpture) Microtomographie Nanoindentation Pigments -- Analyse Vapeur, Technique de la Mots-clés : Concentration pigmentaire volumique (CPV)  Sorption Dynamique de Vapeur d'eau (DVS) Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : This study focuses on the use of micro-sensitive methods – nanoindentation, dynamic water vapour sorption, and X-ray microtomography – to examine the physical properties of small volumes of artists’ materials. The novel methodology proposed in this paper was tested on laboratory-prepared chalk-based ground samples and subsequently applied to distemper paint samples taken from the polychrome walls of Eidsborg stave church. This article discusses key parameters that can be used to inform macro-sized mock-ups mimicking physical and mechanical behaviour of artistic materials, and highlights limitations of such an approach for highly heterogeneous paint systems. Dynamic water vapour sorption measurements allowed determination of the pigment volume concentration (PVC) of distemper paint from Eidsborg stave church as 95%. To the authors’ knowledge, this represents the first assessment of PVC for historic distemper paint using a non-destructive experimental technique, which can be extended to other hygroscopic samples of known composition.

The Permeability of PET by Formic and Acetic Acid Vapors in Studies in conservation, Vol.68 N°3-4(2023; April-May) (2023-04-03)

Public ISBD [article]  inStudies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 458-473 Titre : The Permeability of PET by Formic and Acetic Acid Vapors Type de document : texte imprimé Année de publication : 2023 Article en page(s) : Pages 458-473 Langues : Anglais (eng) Catégories : Acide acétique Conservation et restauration -- Appareils et matériel Encapsulation (chimie) Formique, Acide Papier -- Conservation et restauration -- Recherche Polyéthylène térephtalate -- Perméabilité Revêtement en plastique -- Perméabilité Vapeur, Technique de la Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT The permeability of biaxially oriented polyethylene terephthalate, PET, to vapors from 5%, 30%, and 100% formic acid solutions as well as the vapor from a 30% acetic acid solution was measured by gravimetric analysis in order to determine the transmission rate of the vapors through PET folders and enclosures made from Mylar™ and similar materials, and ultimately understand the microenvironment that is created inside an encapsulate. The data shows that the permeation of formic acid vapor is at least two orders of magnitude slower than the permeation of water vapor. Measurements of the permeation of 30% acetic acid vapor through PET seemed to be due to the permeation of the water only, and the permeation of the acetic acid, if it occurred, occurred too slowly to be measured. The size of the diffusing molecule determines the permeation. Since the permeability decreases as the size of the diffusing vapor molecule increases, a plot of permeability versus vapor size allows the permeability of various other vapors through PET to be predicted. Colorimetry showed that porous PET allowed ambient vapors to diffuse into the encapsulate, and the entire paper within the encapsulate was affected, not only the paper near the holes in the PET. [article] The Permeability of PET by Formic and Acetic Acid Vapors [texte imprimé] . - 2023 . - Pages 458-473. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 458-473 Catégories : Acide acétique Conservation et restauration -- Appareils et matériel Encapsulation (chimie) Formique, Acide Papier -- Conservation et restauration -- Recherche Polyéthylène térephtalate -- Perméabilité Revêtement en plastique -- Perméabilité Vapeur, Technique de la Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT The permeability of biaxially oriented polyethylene terephthalate, PET, to vapors from 5%, 30%, and 100% formic acid solutions as well as the vapor from a 30% acetic acid solution was measured by gravimetric analysis in order to determine the transmission rate of the vapors through PET folders and enclosures made from Mylar™ and similar materials, and ultimately understand the microenvironment that is created inside an encapsulate. The data shows that the permeation of formic acid vapor is at least two orders of magnitude slower than the permeation of water vapor. Measurements of the permeation of 30% acetic acid vapor through PET seemed to be due to the permeation of the water only, and the permeation of the acetic acid, if it occurred, occurred too slowly to be measured. The size of the diffusing molecule determines the permeation. Since the permeability decreases as the size of the diffusing vapor molecule increases, a plot of permeability versus vapor size allows the permeability of various other vapors through PET to be predicted. Colorimetry showed that porous PET allowed ambient vapors to diffuse into the encapsulate, and the entire paper within the encapsulate was affected, not only the paper near the holes in the PET.

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