Terahertz Dynamics of Carboxymethyl Starch

POSTER

Abstract

We performed terahertz time-domain spectroscopy on microwave-treated sodium carboxymethyl starch (CM-Starch), to detect the boson peak and fracton. Starch is a natural polymer formed by polymerization of a number of D-glucose molecules by glycosidic linkage and CM-Starch is produced by carboxymethylating the starch. The obtained spectral shape of boson peak plot α(ν)/ν2 of the CM-Starch, where α(ν) is the absorption coefficient, is different from vitreous glucose. It suggests the existence of the fracton in the CM-Starch.

*This work was partially supported by JSPS KAKENHI Grants No. 17K14318, No. 18H04476 and No. 26287067, and the Asahi Glass Foundation.

Presenters

  • Leona Motoji

    • Division of Materials Science, University of Tsukuba

Authors

  • Wakana Terao

    • Division of Materials Science, University of Tsukuba

  • Leona Motoji

    • Division of Materials Science, University of Tsukuba

  • Tatsuya Mori

    • Division of Materials Science, University of Tsukuba

  • Karolina Kaczmarska

    • Faculty of Foundry Engineering, AGH University of Science and Technology

  • Beata Grabowska

    • Faculty of Foundry Engineering, AGH University of Science and Technology

  • Yasuhiro Fujii

    • Department of Physical Sciences, Ritsumeikan University

  • Akitoshi Koreeda

    • Department of Physical Sciences, Ritsumeikan University

  • Mikitoshi Kabeya

    • Division of Materials Science, University of Tsukuba

  • Jae-Hyon Ko

    • Department of Physics, Hallym University

  • Seiji Kojima

    • Division of Materials Science, University of Tsukuba