Abstract-Sensitive characterizations of natural dolomite by terahertz time-domain spectroscopy

Sibo Hao, Haochong Huang,  Yuanyuan Ma,  Zili Zhang,  Zhiyuan Zheng,



https://www.sciencedirect.com/science/article/abs/pii/S0030401819307990

The pyrolysis and the porosity of natural dolomite are investigated by terahertz time-domain spectroscopy for primary quality control in industry. From terahertz spectra, the transformation of natural dolomite modified by calcination can be clearly differentiated. Based on such results, the thermal active dolomite is studied on adsorbing copper ions in water at first glance. Also, the terahertz maps highlight the subtle variations of the nominal porosity existing in dolomite. In particular, the refractive index and absorption coefficients evidence the variation of mineral properties within natural dolomite. Compared with traditional methods, terahertz time-domain spectroscopy is thus of great significances to gain a non-destructive and contact-free understanding of natural minerals, even in geological studies and environmental industries.

Abstract-Insights into the water status in hydrous minerals using terahertz time-domain spectroscopy

Yuanyuan Ma, Haochong Huang, Sibo Hao, Kunfeng Qiu, Hua Gao, Lu Gao, Weichong Tang, Zili Zhang, Zhiyuan Zheng


https://www.nature.com/articles/s41598-019-45739-2

The determinations of water status incorporated in hydrous minerals are of considerable significances in geoscience fields. Coincidentally, the aqueous sensitivity of terahertz radiation has motivated numerous explorations in several cross-domain applications. Terahertz time-domain spectroscopy is employed as a major probing technique coupling of traditional detecting methods to uncover the mask of water status in copper sulfate pentahydrate as well as mineral quartz in this article. Based on the quantitative identification of water status in copper sulfate pentahydrate, the water incorporated in mineral quartz is verified qualitatively. Notable differences of optical constants originating from the water content are obtained for copper sulfate pentahydrate and mineral quartz. These present works indicate that terahertz technology can be considered as a promising method to satisfy the ever-increasing requirements in hydrous mineral analyses.