J. Phys. IV France 125 (2005) 691-695
Photothermal characterization of thermally treated shells of Strombus GigasA. Hernández-Ayala1, P. Quintana1, J.J. Alvarado-Gil1 and D. Aldana2
1 Applied Physics Department, Cinvestav-Unidad Mérida, Mexico
2 Departamento de Recursos del Mar, Cinvestav-Unidad Mérida, Carretera Antigua a Progreso km. 6, Mérida Yucatán, Mexico 97310, Mexico
The thermal properties of the marine shells of the mollusk Strombus gigas are studied using photoacoustic techniques. In order to generate changes in the layered structure of the shells, they were thermally treated in the range from ambient temperature up to 400ºC. Our results show that the thermal diffusivity and conductivity have a maximum at 200ºC due to the degradation of the organic matrix. At higher temperatures the thermal diffusivity and conductivity decrease due to the calcium carbonate structural phase transition from aragonite to calcite.
© EDP Sciences 2005