[FTIR spectroscopic study on natural aragonitic ceramics-bivalve shells of Hyriopsis cumingii].
The two shell layers, i. e. , the ligament (HCL) and the inner nacreous layers (HCN) from bivalve shells of Hyriopsis cumingii, both composed of aragonite by powder XRD analysis, w ere comparatively analyzed by FT IR spectrometry. The results show that: (1) the features of vz and v3 bands of aragonite are clearly different between the two shell layers, as the v2 band of HCN aragonite shows a 6. 5 cm(-1) blue-shift, but the vs band shows a 22. 7 cm(-1) red-shift compared to that of HCL aragonite; (2) the full width at half maximum of v1 and v3 bands of HCN aragonite is nearly doubled compared to that of HCL aragonite; (3) however, the features of v1 and v4 bands are independent on shell layers. It is suggested that the anisotropic frequency shifts of the aragonite in HCN and HCL perhaps result from the size effects of aragonite crystals.
Ding
Shi-lei
SL
College of Chemistry and Chemical Engineering, Guangxi University, Guangxi 530004, China.
Zhang
Gang-sheng
GS
D000818:Animals; D049872:Bivalvia / Q000737:chemistry*; D002119:Calcium Carbonate / Q000032:analysis*; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared
D002119:Calcium Carbonate