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Terahertz absorption characteristics of different pH value solutions

Water molecules are polar molecules, and intermolecular hydrogen bonds interact strongly with terahertz waves, which makes it very difficult to study the dynamic characteristics of biological samples in aqueous solutions by using terahertz technology. Microfluidic technology is famous for its ability to accurately control micro scale fluid, and its channel depth can reach 50 μm or even smaller. Because microfluidic technology reduces the propagation distance of terahertz wave in the fluid, it greatly reduces the absorption of water to terahertz wave. In addition, pH value also has a certain impact on biological activity. In this study, different pH values are generated by changing the concentration of hydrogen ions and hydroxyl ions in aqueous solution. THz technology and microfluidic technology are combined to explore the THz spectrum characteristics in different pH value of strong acid and alkali solution, and analyze the influence of pH value on the absorption characteristics .