Information Transforming Soft Matter Research Unit

Principal Investigator

PI Name Daigo Miyajima
Degree Ph.D.
Title Unit Leader
Brief Resume
2013 Ph. D., University of Tokyo
2013 Postdoctoral Researcher, RIKEN Center for Emergent Matter Scienc
2014 Special Postdoctoral Researcher, RIKEN Center for Emergent Matter Science
2017 Senior Research Scientist, RIKEN Center for Emergent Matter Science
2018 Unit Leader, Information Transforming Soft Matter Research Unit, Cross-Divisional Materials Research Program, RIKEN Center for Emergent Matter Science (-present)


Our unit challenges to develop novel organic materials based on basic concepts of synthetic organic and supramolecular chemistries. In particular, we are mainly trying to selectively syn-thesize kinetic products by controlling self-assemblies of molecules.

Research Fields

Chemistry, Materials Science


Molecular design
Two-dimensional materials
Polymer synthesis


Actuator driven by fluctuations in environmental humidity

We have developed a film that curls up and straightens out autonomously when exposed to tiny, barely measurable changes in ambient humidity. When irradiated with ultraviolet light, which causes changes in the film’s ability to absorb and desorb water, it can even “jump” into the air. In the same way that a mechanical watch takes advantage of the natural movements of the wrist to gain energy, this film takes tiny fluctuations in the ambient humidity and transforms them into mechanical energy. This type of device will be useful for creating a sustainable society.


Photos and schematic illustration of jumping of the film with photo-irradiation


Daigo Miyajima

Unit Leader daigo.miyajima[at] R

Ryotaro Ibuka

Research Scientist

Barun Dhara

Postdoctoral Researcher

Hiroyuki Inuzuka

Technical Staff I

Toshie Wakamatsu

Research Part-time Worker I

Yuko Hamada

Research Part-time Worker I

Tsuneaki Sakurai

Visiting Scientist


  1. K. V. Rao, D. Miyajima, A. Nihonyanagi, and T. Aida

    Thermally bisignate supramolecular polymerization

    Nat. Chem. 9, 1133 (2017)
  2. H. Arazoe, D. Miyajima, K. Akaike, F. Araoka, E. Sato, T. Hikima, M. Kawamoto, and T. Aida

    An autonomous actuator driven by fluctuations in ambient humidity

    Nat. Mater. 15, 1084 (2016)
  3. J. Kang, D. Miyajima, T. Mori, Y. Inoue, Y. Itoh, and T. Aida

    A rational strategy for the realization of chain-growth supramolecular polymerization

    Science 347, 646 (2015)
  4. J. Kang, D. Miyajima, Y. Itoh, T. Mori, H. Tanaka, M. Yamauchi, Y. Inoue, S. Harada, and T. Aida

    C5-Symmetric Chiral Corannulenes: Desymmetrization of Bowl Inversion Equilibrium via “Intramolecular” Hydrogen-Bonding Network

    J. Am. Chem. Soc. 136, 10640 (2014)



2-1 Hirosawa, Wako, Saitama 351-0198 Japan