Cholesteric liquid crystals as weathering indicators for marble surfaces

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National Technical University of Athens

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Title

Cholesteric liquid crystals as weathering indicators for marble surfaces (EN)

Creator

Bisbikou, K (EN)

Moropoulou, A (EN)

Koui, M (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:15:30Z

2000 (EN)

Year

2000 (EN)

Description

Cholesteric liquid crystals have been used to study the weathered surfaces of marble from the Sanctuary of Demeter in Eleusis, near Athens. Previous investigations have shown that when a cholesteric phase is spread across the surface of the stone, the pitch of the mesophase is sensitive to the topography of the surface. The wavelength of the maximum in the reflected spectrum varies therefore with the microtexture of the surface. Small samples of surface stone from the temple which had been weathered in distinctive ways, were investigated in the laboratory. There appears to be a significant correlation between the optical reflectance spectra and the surface microtopography investigated by SEM, as indicated by computer aided analysis (Digital Image Processing). The results point to the development of an effective in situ method of monitoring the weathering of marble surfaces using cholesteric liquid crystals. (EN)

Scientific field

Crystallography (EN)

Natural Sciences ▶ Chemical sciences
Crystallography (EN)

Subject

SUPPORT (EN)

OXIDE (EN)

SORPTIVE PROPERTIES (EN)

cholesteric liquid crystal (EN)

Journal

LIQUID CRYSTALS (EN)

Language

English