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

被引：8

作者：

Zhong, Junlan ^{[1
]}

Nakagawa, Shin ^{[1
]}

Kaczmarska, Karolina ^{[2
]}

Terao, Wakana ^{[1
]}

Grabowska, Beata ^{[2
]}

Fujii, Yasuhiro ^{[3
]}

Koreeda, Akitoshi ^{[3
]}

Kohara, Shinji ^{[4
]}

Tanimoto, Hisanori ^{[1
]}

Tokoro, Hiroko ^{[1
]}

Ohkoshi, Shin-Ichi ^{[5
]}

Ko, Jae-Hyeon ^{[6
]}

Duan, Yu ^{[1
]}

Mori, Tatsuya ^{[1
]}

机构：

[1] Univ Tsukuba, Dept Mat Sci, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan

[2] AGH Univ Sci & Technol, Fac Foundry Engn, Reymonta 23, PL-30059 Krakow, Poland

[3] Ritsumeikan Univ, Dept Phys Sci, 1-1-1 Noji Higashi, Kusatsu, Shiga 5258577, Japan

[4] Natl Inst Mat Sci, Res Ctr Adv Measurement & Characterizat, Quantum Beam Field, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[5] Univ Tokyo, Sch Sci, Dept Chem, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[6] Hallym Univ, Sch Nano Convergence Technol, 1 Hallymdaehakgil, Chunchon 24252, Gangwondo, South Korea

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2022年 / 266卷

关键词：

Terahertz time-domain spectroscopy; Boson peak; Carboxymethyl starch; Fractal dynamics; Hydrogen bonding; Molecular dynamics; BOSON PEAK; THERMAL-CONDUCTIVITY; DYNAMICS; RAMAN; POLYMORPHISM; REFINEMENT; SPECTRA; GLUCOSE;

D O I：

10.1016/j.saa.2021.120414

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

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. (c) 2021 Elsevier B.V. All rights reserved.

引用

页数：8

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