三角帆蚌贝壳粉与其珍珠粉的微结构及其光谱学特征

Microstructure and Spectroscopic Characteristics of Shell and Pearl Powder from Hyriopsis Cumingii

采用扫描电镜(SEM)、热重分析(TG)、傅里叶变换红外光谱(FTIR)及白度测试对三角帆蚌贝壳与其养殖的珍珠研磨粉进行了对比研究。结果表明:1珍珠粉的υ2谱带较于贝壳粉的该谱带存在约1~3cm-1的蓝移,两者文石中的υ1与υ4谱带具有较好的一致性;2 SEM观察下,粉体的颗粒粒径大小与形貌特征并不能作为贝壳粉与珍珠粉区分鉴别的依据。3随煅烧温度的升高,贝壳粉与珍珠粉的白度先下降后升高,珍珠粉白度降低的速率高于贝壳粉,且煅烧后珍珠粉的白度最低值低于煅烧贝壳粉的白度最低值。

Scanning electron microscopy(SEM),thermal gravimetric(TG)analysis,Fourier transformation infrared spectra(FTIR)and whiteness test were employed to comparatively investigate the differences between shell powder and the corresponding pearl powder from bivalve shell,Hyriopsis cumingii.It was found that:1 the frequency ofυ2band of aragonite in pearl powder was greater than that in shell powder,and the blue shift ofυ2band was about 1~3cm-1.But the frequencies ofυ1 andυ4 bands of aragonite were not altered.2 based on SEM images,the particle side and morphology of shell powder and pearl powder could not be taken as the standard for discriminating shell powder and pearl powder.3 with increasing calcining temperature,the whiteness of pearl powder and shell powder gradually decreased first and then increased.The decreasing rate of pearl′s whiteness was faster than shell′s.Meanwhile,the lowest whiteness of pearl powder calcinated was lower than shell′s.