Abstract
Magnetic fluid is a new functional material with both liquid fluidity and solid magnetism, which has important application value in medicine, biology, and so on. In this study, terahertz technology and microfluidic technology were combined to investigate the terahertz transmission characteristics of a magnetic fluid in different magnetic fields and different electric fields. In the external magnetic field, the intensity of the terahertz spectrum increased with an increase in the magnetic field intensity, and the response to the magnetic field in different directions was different. Under the applied electric field, the intensity of the terahertz spectrum decreased with an increase in the electric field intensity. This method is convenient for studying the terahertz characteristics of magnetic fluid and provides technical support for in-depth studies of magnetic fluid.
Highlights
International Journal of Optics its low reagent consumption, fast detection speed, and easy operation
Some magnetic fluid with a concentration of 35% was injected into the THz microfluidic chip to form a 50 μm magnetic fluid film, which was placed into the terahertz time domain spectroscopy (THz-TDS) system
In this study, we converted the two electromagnets perpendicular to the THz wave, i.e., the magnetic field direction was perpendicular to the THz transmission direction, and we found that the time domain and frequency domain spectrum of THz waves did not produce significant changes
Summary
International Journal of Optics its low reagent consumption, fast detection speed, and easy operation. En, the sample of the magnetic fluid was injected into the chip through the liquid inlet and left standing for 24 h. To detect the transmittance of the THz microfluidics chip made of quartz glass, the chip without the sample was first placed into the optical path and detected by the THz-TDS system. It did not react with the microfluidic chip. Microfluidic chips made of quartz glass are cheaper than those made of COC, and this opens up new avenues for the detection of many organic liquids that react with COC
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