Title :
Polarization phenomena characteristic of ageing of bone
Author :
Dandurand, Jany ; Maurel, Eliane ; Lacabanne, Colette
Author_Institution :
Lab. de Phys. des Polymeres, Univ. Paul Sabatier, Toulouse, France
Abstract :
A comparative TSC study of present and prehistorical bones has shown the existence of two relaxation modes in all samples. The one around room temperature has been associated with water; the other around -150°C has been assigned to relaxations of segments of hydroxyls in apatitic tunnels. In prehistorical bones, a low temperature sub-mode can be distinguished: it has been located in paracrystalline regions. The component observed in all samples corresponds to crystalline domains. Upon ageing, the size of the crystalline domains increases as revealed by the increase of the maximum activation enthalpies
Keywords :
bioelectric phenomena; biothermics; bone; dielectric polarisation; dielectric relaxation; enthalpy; hydrogen bonds; molecular biophysics; thermally stimulated currents; -150 degC; ageing; apatitic tunnels; bone; comparative TSC study; crystalline domains; hydroxyl segments; low temperature sub-mode; maximum activation enthalpies; paracrystalline regions; polarization phenomena characteristic; prehistorical bones; present bones; relaxation modes; room temperature; water; Aging; Bones; Dielectrics; Polarization; Temperature;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578200
