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Investigation of the vibrational density of states of sodium carboxymethyl starch glass via terahertz time-domain spectroscopy.
Zhong, Junlan; Nakagawa, Shin; Kaczmarska, Karolina; Terao, Wakana; Grabowska, Beata; Fujii, Yasuhiro; Koreeda, Akitoshi; Kohara, Shinji; Tanimoto, Hisanori; Tokoro, Hiroko; Ohkoshi, Shin-Ichi; Ko, Jae-Hyeon; Duan, Yu; Mori, Tatsuya.
Affiliation
  • Zhong J; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
  • Nakagawa S; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
  • Kaczmarska K; AGH - University of Science and Technology, Faculty of Foundry Engineering, Reymonta 23, 30 059 Krakow, Poland.
  • Terao W; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
  • Grabowska B; AGH - University of Science and Technology, Faculty of Foundry Engineering, Reymonta 23, 30 059 Krakow, Poland.
  • Fujii Y; Department of Physical Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan.
  • Koreeda A; Department of Physical Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan.
  • Kohara S; Quantum Beam Field, Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
  • Tanimoto H; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
  • Tokoro H; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
  • Ohkoshi SI; Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
  • Ko JH; School of Nano Convergence Technology, Hallym University, 1 Hallymdaehakgil, Chuncheon, Gangwondo 24252, Republic of Korea.
  • Duan Y; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
  • Mori T; Department of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan. Electronic address: mori@ims.tsukuba.ac.jp.
Spectrochim Acta A Mol Biomol Spectrosc ; 266: 120414, 2022 Feb 05.
Article in En | MEDLINE | ID: mdl-34619511
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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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Terahertz Spectroscopy Language: En Journal: Spectrochim Acta A Mol Biomol Spectrosc Journal subject: BIOLOGIA MOLECULAR Year: 2022 Document type: Article Affiliation country: Japan
Fulltext
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Terahertz Spectroscopy Language: En Journal: Spectrochim Acta A Mol Biomol Spectrosc Journal subject: BIOLOGIA MOLECULAR Year: 2022 Document type: Article Affiliation country: Japan