Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy
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 tera...
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| Format: | Article |
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MDPI AG
2021-05-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/9/3161 |
| _version_ | 1797535427390865408 |
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| author | Jaeseung Im Taewon Goo Jugyoung Kim Soobong Choi Sung Ju Hong Young-Mi Bahk |
| author_facet | Jaeseung Im Taewon Goo Jugyoung Kim Soobong Choi Sung Ju Hong Young-Mi Bahk |
| author_sort | Jaeseung Im |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T11:44:21Z |
| format | Article |
| id | doaj.art-725c12ac708f46c8ac6c7e69c0ef4cf6 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T11:44:21Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-725c12ac708f46c8ac6c7e69c0ef4cf62023-11-21T18:12:28ZengMDPI AGSensors1424-82202021-05-01219316110.3390/s21093161Detection of Microplastic in Salts Using Terahertz Time-Domain SpectroscopyJaeseung Im0Taewon Goo1Jugyoung Kim2Soobong Choi3Sung Ju Hong4Young-Mi Bahk5Department of Physics, Incheon National University, Incheon 22012, KoreaDepartment of Physics, Incheon National University, Incheon 22012, KoreaDepartment of Physics, Incheon National University, Incheon 22012, KoreaDepartment of Physics, Incheon National University, Incheon 22012, KoreaDivision of Science Education, Kangwon National University, Chuncheon 24341, KoreaDepartment of Physics, Incheon National University, Incheon 22012, KoreaWe 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.https://www.mdpi.com/1424-8220/21/9/3161microplasticterahertz time-domain spectroscopyterahertz waveseffective medium model |
| spellingShingle | Jaeseung Im Taewon Goo Jugyoung Kim Soobong Choi Sung Ju Hong Young-Mi Bahk Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy Sensors microplastic terahertz time-domain spectroscopy terahertz waves effective medium model |
| title | Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy |
| title_full | Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy |
| title_fullStr | Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy |
| title_full_unstemmed | Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy |
| title_short | Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy |
| title_sort | detection of microplastic in salts using terahertz time domain spectroscopy |
| topic | microplastic terahertz time-domain spectroscopy terahertz waves effective medium model |
| url | https://www.mdpi.com/1424-8220/21/9/3161 |
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