Effect of ammonium salt on hydrogen bond based on terahertz microfluidic chip

Qinghao Meng; Jing Ding; Qingjun Li; Bo Su; Cunlin Zhang

doi:10.1117/12.2602489

9 October 2021 Effect of ammonium salt on hydrogen bond based on terahertz microfluidic chip

Qinghao Meng, Jing Ding, Qingjun Li, Bo Su, Cunlin Zhang

Proceedings Volume 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII; 119060Y (2021) https://doi.org/10.1117/12.2602489
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

In recent years, with the continuous development of terahertz detection technology, the use of terahertz spectroscopy to study chemical samples has become one of the indispensable means in the field of biochemistry. However, the biological activity of most biomolecules can only be expressed in water solution, while water as polar molecules has strong absorption properties of THz wave. Therefore, it is difficult to study the activity of biological samples in water solution by using terahertz technology. In this study, a sandwich terahertz microfluidic chip with high transmission to terahertz wave was designed. The detection area of THz microfluidic chip is COC material, which is colorless and transparent, has no obvious absorption peak in THz frequency range, and has high THz wave transmission. The THz transmission of 2 mm thick COC can reach more than 90%. A valveless micropump was designed on the chip surface to realize automatic injection. The terahertz transmission spectra of distilled water, 0.9 mol/L NH₄Cl, (NH₄)₂SO₄, (NH₄)₂CO₃ and CH₃COONH₄ were measured by combining the chip with terahertz technology in the frequency range of 0.1–0.7 THz. The experimental results show that at the same concentration, the THz spectra of different ammonium salt solutions are obviously different and the spectral intensity is lower than that of distilled water, which indicates that the hydration process of ions has an effect on the hydrogen bond between water molecules, and is reflected in the terahertz transmission spectrum.

Citation Download Citation

Qinghao Meng, Jing Ding, Qingjun Li, Bo Su, and Cunlin Zhang "Effect of ammonium salt on hydrogen bond based on terahertz microfluidic chip", Proc. SPIE 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII, 119060Y (9 October 2021); https://doi.org/10.1117/12.2602489

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