A New Non-Destructive Method to Differentiate In Situ Marble from Gypsum and CaC0₃ from Inversion of Gypsum; Use of Liquid Crystals

Th. Skoulikidis Department of Materials Science and Engineering, Faculty of Chemical Engineering, National Technical University of Athens, Athens, 157 73, Greece

M. Koui Department of Materials Science and Engineering, Faculty of Chemical Engineering, National Technical University of Athens, Athens, 157 73, Greece

A. Kostoudi Department of Materials Science and Engineering, Faculty of Chemical Engineering, National Technical University of Athens, Athens, 157 73, Greece; Nat. Techn. Univ. of Athens., Experimental Collaboration with P. Vrettas, Senior Chem. Eng. Stud

Abstract

Based on our previous work, with which it was proved that the reflected light (wave length) from cholesteric liquid crystals also depends on the adsorption properties of the surface of their supports, we used them to differentiate gypsum from marble and CaCO₃ (from inversion of gypsum) with success. This is interesting for the study of the preservation and restoration of ancient monuments or new buildings. Thus, a new non-destructive method to be used in situ has resulted.

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A New Non-Destructive Method to Differentiate In Situ Marble from Gypsum and CaC0₃ from Inversion of Gypsum; Use of Liquid Crystals

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A New Non-Destructive Method to Differentiate In Situ Marble from Gypsum and CaC03 from Inversion of Gypsum; Use of Liquid Crystals

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A New Non-Destructive Method to Differentiate In Situ Marble from Gypsum and CaC0₃ from Inversion of Gypsum; Use of Liquid Crystals