Abstract
Sodium carboxymethyl cellulose is a type of macromolecular chemical substance that is widely used in the industry for food thickening. In this study, terahertz and microfluidic technologies were combined, and a microfluidic chip with a channel depth of 50 μm was fabricated to carry samples. The terahertz characteristics of the sodium carboxymethyl cellulose colloid were studied at different concentrations and applied electric fields. The obtained results showed that different concentrations of sodium carboxymethyl cellulose have different time-domain spectra; with an increase in concentration, the terahertz transmittance of sodium carboxymethyl cellulose decreased. Under the applied electric field treatment, the longer the electric field acting time is, the higher the terahertz transmission intensity is. This approach is a safe and reliable new method for the determination of sodium carboxymethyl cellulose concentration, which provides technical support for the in-depth study of sodium carboxymethyl cellulose.
Highlights
Terahertz (THz) is the electromagnetic radiation in the frequency range of 0.1–10 THz and the wavelength range of 30 μm–3 mm. e THz region is between the infrared and microwave regions, and it has not been fully exploited
Because the THz wavelength is long and the energy is low, it does not ionize the sample and can be used for nondestructive testing of materials; the use of THz waves for material testing has the advantages of safety and reliability. e characteristic vibration modes of many chemical reagents and biological macromolecules and sugars happen to be in the THz range [1,2,3,4,5,6,7]. is characteristic provides a reliable basis for the study of some macromolecules using THz technology
Sun [14] studied the influence of hydrophobic and hydrophilic groups on the water structure by Raman spectroscopy, and the obtained results showed that adding hydrophilic groups affected hydrogen bonds in water
Summary
Terahertz (THz) is the electromagnetic radiation in the frequency range of 0.1–10 THz and the wavelength range of 30 μm–3 mm. e THz region is between the infrared and microwave regions, and it has not been fully exploited. Wu et al [2] studied the characteristics of four electrolyte solutions (i.e., KCl, KBr, MgCl2, and CaCl2) in the range of 0.1–1.0 THz using THz technology. It is relatively difficult to study the THz transmission spectrum of liquid samples owing to the strong absorption of THz radiation by water. E obtained results showed that the absorption coefficient of water monotonically increases with an increase in frequency in the frequency range from 0.2 to 1 THz. Leclerc et al [8] explored a direct and fast method to manufacture a microfluidic chip system using a polystyrene plate and computer micromachining technology. Microfluidic and THz technologies were combined to explore different concentrations of the CMC-Na colloid, and the feasibility of the method was confirmed. The THz absorption characteristics of CMC-Na were tested under the applied electric field treatment
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