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Frontiers of Optoelectronics

Front. Optoelectron.    2017, Vol. 10 Issue (2) : 132-137     DOI: 10.1007/s12200-017-0681-0
RESEARCH ARTICLE |
Characterization of the cooling process of solid n-alkanes via terahertz spectroscopy
Chen JIANG, Honglei ZHAN, Kun ZHAO(), Cheng FU
Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
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Abstract

The terahertz (THz) time-domain spectroscopy technique was used to characterize the cooling process of solid n-alkanes. The THz waveforms of n-octadecane, n-nonadecane, n-eicosane, n-heneicosane, n-docosane, and n-pentacosane were obtained with the cooling time using the aforementioned noncontact optical method. The peak values of the THz signal were found to be related to the cooling temperature of n-alkanes. The THz wave was sensitive to the size and structure of particles in the liquid; therefore, the crystallization process of n-alkanes was monitored. An empirical equation based on signal attenuation was proposed to quantitatively distinguish the content change of structural order in the samples. Results present a new noncontact optical approach for characterizing wax crystallization via THz time-domain spectroscopy.

Keywords solid n-alkanes      terahertz (THz) time-domain spectroscopy      cooling process     
Corresponding Authors: Kun ZHAO   
Just Accepted Date: 24 February 2017   Online First Date: 17 March 2017    Issue Date: 05 July 2017
 Cite this article:   
Chen JIANG,Honglei ZHAN,Kun ZHAO, et al. Characterization of the cooling process of solid n-alkanes via terahertz spectroscopy[J]. Front. Optoelectron., 2017, 10(2): 132-137.
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http://journal.hep.com.cn/foe/EN/10.1007/s12200-017-0681-0
http://journal.hep.com.cn/foe/EN/Y2017/V10/I2/132
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Chen JIANG
Honglei ZHAN
Kun ZHAO
Cheng FU
Fig.1  Diagram of the THz-TDS setup with a sample cell
Fig.2  THz waveforms of cooling time in the samples: (a) n-octadecane C18, (b) n-nonadecane C19, (c) n-eicosane C20, (d) n-heneicosane C21, (e) n-docosane C22, and (f) n-pentaccosane C25. (g) Peak value (EP) with the cooling time of the six samples
Fig.3  Temperature variation in the different cooling times of the six samples
Fig.4  Peak value (EP) with the temperature of the six samples. Melting point is 28.18°C, 31.9°C, 36.8°C, 39°C, 44.4°C, and 53.3°C for C18H38, C19H40, C20H42, C21H44, C22H46, and C25H52, respectively
Fig.5  Temperature-governed signal attenuation for the six samples
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