Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy
| Autor: | Jugyoung Kim, Taewon Goo, Young-Mi Bahk, Sung Ju Hong, Soo Bong Choi, Jaeseung Im |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Terahertz radiation TP1-1185 02 engineering and technology Dielectric 010501 environmental sciences 01 natural sciences Biochemistry Analytical Chemistry Transmittance Electrical and Electronic Engineering Spectroscopy Terahertz time-domain spectroscopy Instrumentation 0105 earth and related environmental sciences business.industry Chemical technology Communication 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Attenuation coefficient Optoelectronics effective medium model High-density polyethylene terahertz waves 0210 nano-technology business Refractive index microplastic terahertz time-domain spectroscopy |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 21, Iss 3161, p 3161 (2021) |
| ISSN: | 1424-8220 |
| Popis: | We report on a prototypical study of the detection of microplastic embedded in table salts by using terahertz time-domain spectroscopy. In the experiment, high-density polyethylene (HDPE) of sizes from 150 to 400 μm are used as a representative microplastic and mixed with table salts. Analyzing terahertz transmittance with an effective medium model, we extract various optical properties such as refractive index, absorption coefficient, and real/imaginary parts of the dielectric constant of the mixture. Consequently, the optical properties exhibit volume-ratio-dependence in 0.1–0.5 THz regimes. Especially, the refractive index and the real part of the dielectric constant possess monotonic frequency dependence, meaning that the quantities can be relevant indicators for the detection of the microplastic in terms of practical applications. Our work proves that terahertz time-domain spectroscopy can pave a way to recognize microplastic mixed with salts and be expanded for detecting various micro-sized particles. |
| Databáze: | OpenAIRE |
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