Objective
Background During their lifetime glass objects may have experienced different environmental conditions (in soil, water, polluted or humid air etc.). The corrosion process changes the surface structure of sensitive glasses. Based on leaching processes a water-rich gel layer with microcracks, covered by a crust of corrosion products and dirt is built up. The actual preservation state of a particular glass object reflects all its history and influences its future behaviour. Any effective conservation concept for glass objects has to be based on the knowledge about its actual corrosion state. Recognized methods for the analysis of corroded glass, like SEM-EDX or XPS are destructive, as they require embedding in a polymer to prepare cross-sections or sputtering to obtain depth-profiles. Operating in vacuum alters the water-containing gel-layer which is to be examined. Computerized X-ray Tomography (CT) is an imaging technique first developed for medical radiology. The only application of CT in the cultural heritage domain dealt with stone deterioration. Detecting the corrosion state of glass objects is feasible, in principle, by visualizing the porous structure and the water-content of the corroded layer. However, the existing equipment has to be improved and adapted for this purpose.
Objectives The aim of this project is to introduce micro- computerized X-ray Tomography (mCT) as a new non- destructive tool for glass conservation. As a result, the main objectives are: - to adapt/improve mCT equipment to analyse glass objects; - to use model glasses to calibrate mCT analysis; - to detect the state of corrosion of glass objects by mCT; - to demonstrate the potential of mCT for the improvement of restoration/conservation techniques for sensitive glasses.
Work programme In order to achieve these objectives, model glasses simulating corrosion phenomena of originals will be prepared and characterized by all available destructive methods, such as SEM-EDX or XPS. Based on these data the parameters for the new non-destructive mCT-equipment will be calibrated. Special emphasis will be given to optimize mCT to detect the layered structure of corroded original glass (archaeological objects or medieval window glass). The effectiveness of cleaning sensitive glasses with lasers will be monitored to demonstrate the potential of mCT for the evaluation of restoration/conservation measures on glass objects.
State of progress The project has just started.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- humanities history and archaeology history
- engineering and technology materials engineering amorphous solids inorganic amorphous solids
- natural sciences chemical sciences polymer sciences
- medical and health sciences clinical medicine radiology
- natural sciences physical sciences optics laser physics
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Coordinator
97877 WERTHEIM
Germany
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