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Terahertz time-domain spectroscopy of a simulated pore structure to probe particle size and porosity of porous rock * Dong Chen(董 晨) a)b) † , Bao Ri-Ma(宝日玛) b) , Zhao Kun(赵 昆) a)b)c) ‡ , Xu Chang-Hong(许长虹) b) , Jin Wu-Jun(金武军) b) , and Zhong Shou-Xian(钟寿仙) c) a

Terahertz time-domain spectroscopy (THz-TDS) is used to study the interaction between AlCl 3 and o-xylene in a temperature range from 300 K to 368 K. For comparison, the three isomers of o-, m-, and p-xylene are measured by using THz-TDS. The o-xylene carries out isomerization reaction in the presence of catalyst AlCl 3 . The absorption coefficient of the mixed reaction solution is extracted and analyzed in the frequency range from 0.2 THz to 1.4 THz. The temperature dependence of the absorption coefficient, which is influenced by both the dissolution of AlCl 3 and the production of the two other isomer resultants, is obtained, and it can indicate the process of the isomerization reaction. The results suggest that THz spectroscopy can be used to monitor the isomerization reaction and other reactions in chemical synthesis, petrochemical and biomedical fields.

Experimental researches including emulsion's stability, type identification and fluid interface detection have been carried out by terahertz technology in this paper. Stabilities of three crude oil emulsions and the demulsification process have been monitored by real-time terahertz spectroscopy. Meanwhile, O/W emulsions rather than W/O emulsions demonstrate characteristic absorption peaks at special frequency. These characteristic absorption peaks can be used to determine the concrete type of crude oil emulsions. The results will provide experimental foundation and data preparation for terahertz applications in quick quantitative evaluation and identification of crude oil emulsions.