Investigation of the vibrational density of states of sodium carboxymethyl starch glass via terahertz time-domain spectroscopy

Zhong, Junlan; Nakagawa, Shoichi; Kaczmarska, K.; Terao, Wakana; Grabowska, B.; Fujii, Yasuhiro; Koreeda, Akitoshi; Kohara, Shinji; Tanimoto, H.; Tokoro, Hiroko; Ohkoshi, Shin‐ichi; Ko, Jae‐Hyeon; Duan, Yu; Mori, Tatsuya

doi:10.1016/j.saa.2021.120414

Cited by 6 publications

(2 citation statements)

References 48 publications

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“…Moreover, the absorption coefficient of the THz spectrum is determined by the extinction coefficient (see eq S5 for details), as shown in the following equation: where μ is the permeability of the material. The value of the real part of the complex dielectric function is much larger than the value of imaginary parts . Therefore, the extinction coefficient is mainly determined by the value of the imaginary part.…”

Section: Resultsmentioning

confidence: 99%

“…The value of the real part of the complex dielectric function is much larger than the value of imaginary parts. 40 Therefore, the extinction coefficient is mainly determined by the value of the imaginary part. In conclusion, we believe that THz absorption spectroscopy is as capable of estimating crystallinity as the imaginary part of the complex dielectric function.…”

Section: Correlation Between the Terahertz Spectrum And Crystallinity...mentioning

confidence: 99%

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Study of Crystallinity and Conformation of Poly(lactic acid) by Terahertz Spectroscopy

et al. 2022

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During crystallization, conformational changes are often accompanied by the formation of interactions. Terahertz (THz) spectroscopy exhibits strong responses to the crystalline poly(lactic acid) (PLA). Therefore, we estimate the relative crystallinity and investigate the effect of conformational transition on the vibration of PLA by THz spectroscopy. By comparing with the results of X-ray diffraction (XRD) and differential scanning calorimetry (DSC), the validity of THz spectroscopy to calculate crystallinity is verified. Furthermore, the peak intensity of PLA at 2.01 THz increases with crystallinity. Combined with Fourier transform infrared spectroscopy (FTIR), the vibrational intensity of PLA at 2.01 THz is highly correlated with the contribution of gt conformation, showing a linear relationship. In addition, the vibrational peak of PLA also reflects the interchain interactions. We believe that the increase in peak intensity with increasing crystallinity originates from the effect of the dipole−dipole interactions between the carbonyl groups. Our study demonstrates the ability of THz spectroscopy to estimate the crystallinity of PLA, and the peak at 2.01 THz shows conformational and interaction sensitivities.

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Section: Resultsmentioning

confidence: 99%

Section: Correlation Between the Terahertz Spectrum And Crystallinity...mentioning

confidence: 99%

Study of Crystallinity and Conformation of Poly(lactic acid) by Terahertz Spectroscopy

et al. 2022

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Curcumin-loaded HKUST-1@ carboxymethyl starch-based composites with moisture-responsive release properties and synergistic antibacterial effect for perishable fruits

Liang

Yao

Liu

et al. 2022

International Journal of Biological Macromolecules

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Compositional dependence of the boson peak and fractal dimensionality in Calcium Aluminate glasses prepared by aerodynamic levitation and CO2-laser melting

Nasikas

Kalampounias

2022

Journal of Physics and Chemistry of Solids

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Investigation of the vibrational density of states of sodium carboxymethyl starch glass via terahertz time-domain spectroscopy

Cited by 6 publications

References 48 publications

Study of Crystallinity and Conformation of Poly(lactic acid) by Terahertz Spectroscopy

Study of Crystallinity and Conformation of Poly(lactic acid) by Terahertz Spectroscopy

Curcumin-loaded HKUST-1@ carboxymethyl starch-based composites with moisture-responsive release properties and synergistic antibacterial effect for perishable fruits

Compositional dependence of the boson peak and fractal dimensionality in Calcium Aluminate glasses prepared by aerodynamic levitation and CO2-laser melting

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