Analysis of historical porous building materials by the NMR-MOUSE®

Sharma, Shiv Kumar; Casanova, Federico; Wache, Wieland; Segre, Anna Laura; Blümich, Bernhard

doi:10.1016/s0730-725x(03)00132-2

Cited by 78 publications

(47 citation statements)

References 7 publications

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“…1 and 2 we measured T 1 and T 2 relaxation times. T 1 was measured for obtaining the proper relaxation delay and T 2 with the hope of obtaining useful information on porosity [6][7][8]. However, these measurements, although quite noisy, show similar values in all regions and do not seem useful or informative.…”

Section: Detachment and Crumblingmentioning

confidence: 99%

Fresco paintings studied by unilateral NMR

Proietti

Capitani

Lamanna

et al. 2005

Journal of Magnetic Resonance

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Section: Detachment and Crumblingmentioning

confidence: 99%

Fresco paintings studied by unilateral NMR

Proietti

Capitani

Lamanna

et al. 2005

Journal of Magnetic Resonance

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“…This development allows easy transport of the instrumentation for in situ measurements, a very valuable advantage for plant science. Even if the magnetic field penetrating the object is rather inhomogeneous, this instrument has provided useful information in many fields of application, such as soft matter, food, biological tissue, and porous materials (Zimmer et al, 1998;Hailu et al, 2002;Sharma et al, 2003;Proietti et al, 2004Proietti et al, , 2006Proietti et al, , 2007.…”

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confidence: 99%

In Situ Investigation of Leaf Water Status by Portable Unilateral Nuclear Magnetic Resonance

et al. 2009

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A portable unilateral nuclear magnetic resonance (NMR) instrument was used to detect in field conditions the water status of leaves of herbaceous crops (Zea mays, Phaseolus vulgaris), mesophyllous trees (Populus nigra), and natural Mediterranean vegetation characterized by water-spending shrubs (Cistus incanus) and water-saving sclerophyllous trees (Quercus ilex). A good relationship was observed between NMR signal, leaf relative water content, and leaf transpiration in herbaceous leaves undergoing fast dehydration or slowly developing a drought stress. A relationship was also observed between NMR signal and water potential of Populus leaves during the development of a water stress and when leaves recovered from the stress. In the natural vegetation, the relationship between NMR signal and water status was found in Cistus, the species characterized by high transpiration rates, when measured during a drought stress period and after a rainfall. In the case of the sclerophyllous Quercus, the NMR signal, the relative water content, and the transpiration rate did not change at different leaf water status, possibly because a large amount of water is compartmentalized in cellular structures and macromolecules. The good association between NMR signal and relative water content was lost in leaves exposed for 24 h to dehydration or to an osmotic stress caused by polyethylene glycol feeding. At this time, the transverse relaxation time became longer than in leaves maintained under optimal water conditions, and two indicators of membrane damage, the ion leakage and the emission of products of membrane lipoxygenation [(Z)-3-hexenal, (Z)-3-hexenol, and (E)-2-hexenol], increased. These results taken all together give information on the physiological state of a leaf under a developing stress and show the usefulness of the NMR instrumentation for screening vegetation health and fitness in natural and cultivated conditions. It is concluded that the portable unilateral NMR instrument may be usefully employed in field conditions to monitor nondestructively the water status of plants and to assist agricultural practices, such as irrigation scheduling, to minimize stomatal closure and the consequent limitation to plant production.

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“…Non-destructive, in situ, low-field unilateral nuclear magnetic resonance (NMR) has been successfully applied to assess the condition of objects of cultural significance when sampling was not possible. To date, several studies have been undertaken in order to evaluate the porosity, the detachment of paint, and salt efflorescence in wall paintings [30][31][32]; to determine the state of degradation of paper [33][34][35][36]; the followup on consolidation treatments of porous building materials and wall paintings [36][37][38][39][40]; to study of the absorption and diffusion of water in acrylic paint films [41]; and to characterize stains on paper supports [42]. Moreover, depth profiling using the NMR MOUSE Ò has been applied in the non-invasive spatial tissue discrimination in the ancient mummies and bones [26] and, more recently, to study of the stratigraphy of ancient wall paintings and mosaics [39,40].…”

Section: Characterization and Identification Of Protein-based Bindersmentioning

confidence: 99%

In Situ Unilateral 1H-NMR Studies of the Interaction Between Lead White Pigments and Collagen-Based Binders

et al. 2011

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The lead white pigment, 2PbCO 3 ÁPb(OH) 2 , is thought to play a critical role in the degradation of paint in illuminated manuscripts. Cracking, flaking, and separation of paint films containing lead white on parchment and other works of art have been reported, and have been attributed to the interaction of the pigment with the binding media. A previous study by Fourier transform infrared spectroscopy showed lead white to induce a change in the state of hydration of protein-based binders, though the mechanism of this process is still not well understood. In this work, we apply in situ 1 H unilateral nuclear magnetic resonance (NMR) to explore the nature of the interaction between lead white and collagen-based binders while at the same time we evaluate the feasibility of applying unilateral 1 H-NMR to assess the condition of the paint in medieval-illuminated manuscripts and to follow up the effectiveness of consolidation treatments. Carr, Purcell, Meiboom, and Gill (CPMG) measurements reveal that the addition of lead white to binders derived from collagen, such as bone, rabbit skin or fish glues, increases the T 2eff relaxation constant of these binders. This effect is more pronounced at low relative humidity. The increase in T 2eff suggests that the pigment induces a change in the protein that leads

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Analysis of historical porous building materials by the NMR-MOUSE®

Cited by 78 publications

References 7 publications

Fresco paintings studied by unilateral NMR

Fresco paintings studied by unilateral NMR

In Situ Investigation of Leaf Water Status by Portable Unilateral Nuclear Magnetic Resonance

In Situ Unilateral 1H-NMR Studies of the Interaction Between Lead White Pigments and Collagen-Based Binders

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