Aramaki Takumi, Isoda Miki, Harata Akira
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga, Fukuoka, 816-8580, Japan.
Anal Sci. 2025 Apr 10. doi: 10.1007/s44211-025-00756-2.
Near-infrared excitation photothermal radiometric image identification is demonstrated as a rapid analysis tool for visualizing different types of microplastics (MPs). The excitation wavelengths used for four types of plastic materials, polyethylene terephthalate, polystyrene, polyvinyl chloride, and polypropylene, were 1662 nm, 1681 nm, 1716 nm, and 1725 nm, respectively, in the near-infrared region. After irradiating for 20 s with a specified wavelength, a photothermal radiometric image was recorded with a commercially available thermal camera. Each of the four types of MPs in a 2 mm square and with a 1 mm thickness was successfully visualized. A simple thermal diffusion analysis predicts a time-dependent increase in the temperature rise of each of the plastic materials having their own specific physical properties.
近红外激发光热辐射图像识别被证明是一种用于可视化不同类型微塑料（MPs）的快速分析工具。在近红外区域，用于四种塑料材料（聚对苯二甲酸乙二酯、聚苯乙烯、聚氯乙烯和聚丙烯）的激发波长分别为1662纳米、1681纳米、1716纳米和1725纳米。用指定波长照射20秒后，用市售热像仪记录光热辐射图像。成功可视化了边长为2毫米、厚度为1毫米的四种MPs中的每一种。简单的热扩散分析预测，具有各自特定物理性质的每种塑料材料的温度上升随时间增加。
