AI Article Synopsis
- The study focused on the vibrational density of states of sodium carboxymethyl starch (CM-starch) using terahertz time-domain spectroscopy, revealing a broad peak around 3 THz.
- A boson peak (BP) was identified at 1.16 THz at low temperatures, which disappeared at higher temperatures due to the presence of an excess wing, but its frequency remained stable across temperatures.
- The findings suggested a slight decrease in BP frequency for polymer glasses compared to monomer glasses, and indicated the presence of fractons with an estimated fractal dimension of 2.33 based on the absorption coefficient's power law behavior.
Article Abstract
We investigated the vibrational density of states of sodium carboxymethyl starch (CM-starch) by terahertz (THz) time-domain spectroscopy. The CM-starch showed a broad peak at ∼3 THz. The structure of the peak was similar to those corresponding to glucose-based polymer glasses possessing hydrogen bonds. The boson peak (BP) appeared at 1.16 THz at the lowest temperature and disappeared because of the existence of excess wing at higher temperatures. However, based on our novel BP frequency determination method using the inflection point of the extinction coefficient, the BP frequency showed almost no dependence on temperature. Further, the chain length dependence of the BP frequency of the glucose-based glasses showed that the BP frequency of the polymer glass was slightly lower than that of the monomer glass. The power law behaviour of the absorption coefficient suggested the existence of fractons, and the fractal dimension was estimated to be 2.33.
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| http://dx.doi.org/10.1016/j.saa.2021.120414 | DOI Listing |
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