Masaki Hada

Tsukuba Research Center for Interdisciplinary Materials Science (TREMS), University of Tsukuba
Associate professor
A03

Research AreasUltrafast phenomena, Structural dynamics
Participating Group (2020-2021)

Structural dynamics of soft crystals filmed by table-top ultrafast electron diffraction

Keywords
Time-resolved Electron Diffraction, Soft Crystal, Femtosecond Laser, Structural Dynamics

Research Outline

Ultrafast time-resolved electron diffraction is the methodology to directly observe the structural dynamics of molecules on the femtosecond (10–15 seconds) to picosecond (10–12 seconds) timescale. The researcher has developed the ultrafast time-resolved electron diffraction setup, and will observe and understand the structural dynamics of stimuli-driven phenomena of organic crystals and liquid crystals (stimuli-responsive soft crystals), such as photo-response, thermal-response, vapor-response, or mechanical response, using the relevant setup. Especially, the researcher will focus on the structural dynamics of ill-defined molecular assembles which are difficult to be analyzed with other methodologies. The obtained results lead to the creation of new stimuli-responsive molecular assembles.

Photograph of the experimental setup of ultrafast time-resolved electron diffraction
Experimental setup of ultrafast time-resolved electron diffraction
Participating Group (2018-2019)

Photoinduced phenomena of soft crystals filmed by table-top ultrafast electron diffraction

Keywords
Time-resolved Electron Diffraction, Femtosecond Laser, Structural Dynamics, Soft Crystal

Research Outline

Ultrafast time-resolved electron diffraction is the methodology to directly observe the structural dynamics of molecules on the femtosecond (10–15 seconds) to picosecond (10–12 seconds) timescale. The researcher has developed the ultrafast time-resolved electron diffraction setup, and will observe and understand the structural dynamics of light driven phenomena of organic crystals and liquid crystals (photo-responsive soft crystals) using the setup. Especially, the researcher will focus on the structural dynamics of ill-defined molecular assembles which are difficult to be analyzed with other methodologies. The obtained results lead to the creation of new photo-responsive molecular assembles.

Experimental setup of ultrafast time-resolved electron diffraction

Publications

Academic papers/reviewed

A03-18

  1. "Liquid-like dielectric response is an origin of long polaron lifetime exceeding 10 μs in lead bromide perovskites" K. Miyata, R. Nagaoka, M. Hada, T. Tanaka, R. Mishima, T. Kuroda, S. Sueta, T. Iida, Y. Yamashita, T. Nishikawa, K. Tsuruta, Y. Hayashi, K. Onda, T. Kiwa and T. Teranishi, Journal of Chemical Physics, 2020, 152, 084704.
  2. "Ultrafast isomerization-induced cooperative motions to higher molecular orientation in smectic liquid-crystalline azobenzene molecules" M. Hada, D. Yamaguchi, T. Ishikawa, T. Sawa, K. Ishikawa, S. Koshihara, Y. Hayashi, T. Kato, Nature Communications, 2019, 10, 4159.
  3. "Selective Reduction Mechanism of Graphene Oxide Driven by the Photon Mode versus the Thermal Mode" M. Hada, K. Miyata, S. Ohmura, Y. Arashida, K. Ichiyanagi, I. Katayama, T. Suzuki, W. Chen, S. Mizote, T. Sawa, T. Yokoya, T. Seki, J. Matsuo, T. Tokunaga󠇐, C. Itoh, K. Tsuruta, R. Fukaya, S. Nozawa, S. Adachi, J. Takeda, K. Onda, S. Koshihara, Y. Hayashi, Y. Nishina, ACS Nano, 2019, 13, 10103-10112.
  4. "Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals" M. Hada, S. Saito, R. Sato, K. Miyata, Y. Hayashi, Y. Shigeta, K. Onda, J. Vis. Exp., 2018, 135, e57612.

Related Website(s)
Contact
Hada.masaki.fm@u.tsukuba.ac.jp