Terahertz absorption characteristics of potassium salt solution in electric field based on microfluidic chip

The vibrational and rotational energy levels of many biomolecules are in the terahertz band, so terahertz technology can be used to detect biomolecules. In addition, because the photon energy of terahertz wave is low and will not destroy biological samples in the detection process, terahertz technology has a very wide application prospect in the future research fields such as biochemical detection and information communication. As we all know, most biomolecules need to be in liquid environment to give full play to their biological activity. However, the hydrogen bond in aqueous solution will produce strong absorption in terahertz band. In addition, water molecules are polar molecules, and terahertz wave has strong resonance absorption to polar molecules, which makes it very difficult to detect active biomolecules in liquid environment by terahertz technology. Therefore, many research teams combine terahertz spectroscopy with microfluidic technology to reduce the impact of various factors on biomolecular detection. In this study, the THz microfluidic chip was prepared with cycloolefin copolymer (COC). The five potassium salt solutions in a constant electric field at different times were studied, which provided a basis for further strengthening the application of THz technology in biochemistry. What’s more, the electrolyte solution contains a large number of anions and cations, which will move under the action of electric field. And it provides technical support for the study of the dynamic characteristics of electrolyte solution by terahertz technology.