摘要
应用傅里叶变换红外(FTIR)漫反射光谱首次获得海螺珠及大凤螺壳的原生表面与相应断面的光谱差异性特征,并结合扫描电子显微镜(scanning electron microscopy,SEM)、X射线衍射(X-ray diffraction,XRD)就上述差异性形成机制予以探究。结果表明:海螺珠及大凤螺壳珍珠层的原生表面与其对应的断面红外漫反射光谱存在显著的差异性,体现在:①两者原生表面生物文石的ν_(3)谱带强度与ν_(2)谱带的强度比值大于相应断面上文石对应峰位的强度比值;②两者珍珠层原生表面生物文石的ν_(2)谱带较断面上文石ν_(2)谱带峰位出现明显频移,同时原生表面上的ν_(2)谱带的半高宽小于断面上文石ν_(2)谱带的半高宽;③海螺珠与大凤螺壳珍珠层断面上的文石存在842 nm处的特征峰,但该特征峰并未见于海螺珠与大凤螺壳珍珠层的原生表面。SEM及XRD测试发现,原生表面与断面方向上文石晶体的结晶学各向异性是造成上述红外谱图及XRD衍射谱峰出现特异性的直接原因。研究工作对于认知生物矿化、海螺珠与基于大凤螺壳磨制的圆珠的检测鉴别具有较重要的指导意义。
Fourier-transform infrared(FTIR)diffuse reflectance spectroscopy was employed for the first time to characterize the spectral differences between the native surfaces and corresponding fracture planes of conch pearls and queen conch shells.These observations were further correlated with scanning electron microscopy(SEM)and X-ray diffraction(XRD)analyses to elucidate the underlying mechanisms.The results were shown that:the intensity ratio of ν_(3) to ν_(2) bands of biogenic aragonite on native surfaces significantly exceeded that of aragonite on fracture planes.The ν_(2) band of surface aragonite exhibited a notable frequency-shift compared to fractured aragonite,accompanied by reduced full-width at half-maximum(FWHM).A characteristic peak at 842 nm was identified in fracture-plane aragonite but absent on native surfaces.SEM and XRD analyses revealed that crystallographic anisotropy of aragonite crystals between surface and fracture orientations directly accounts for these spectroscopic and diffraction singularities.This work provides critical insights for understanding biomineralization processes and offers practical guidance for distinguishing conch pearls from polished queen conch shell.
作者
黄雪冰
严雪俊
陆倩芸
孔烨
高嘉依
严俊
HUANG Xuebing;YAN Xuejun;LU Qianyun;KONG Ye;GAO Jiayi;YAN Jun(Zhejiang Fangyuan Test Group Co.,Ltd,Hangzhou,Zhejiang 310013,China)
出处
《光散射学报》
北大核心
2025年第4期757-764,共8页
The Journal of Light Scattering
基金
浙江省市场监管科研项目(项目编号:ZC2023039)
浙江省公益技术研究计划(项目编号:LGG21F010003)。
关键词
海螺珠
大凤螺壳
红外漫反射光谱
择优取向
各向异性
Conch pearl
Conch shell
Diffuse FTIR spectrum
Preferential orientation
Anisotropy
