Kyushu University Academic Staff Educational and Research Activities Database
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Daisuke Kawaguchi Last modified date:2021.06.23

Other Organization

 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Country of degree conferring institution (Overseas)
Field of Specialization
Physical Chemistry of Polymers
Total Priod of education and research career in the foreign country
Research Interests
  • Aggregation States, Molecular Motion and Functions of Functional Polymer Thin Films
    keyword : Polymers, Devices, Surfaces, Interfaces, Thin films
Academic Activities
1. Yudai Ogata, Tatsuki Abe, Shigeki Yonemori, Norifumi L. Yamada, Daisuke Kawaguchi, Keiji Tanaka, Impact of the Solid Interface on Proton Conductivity in Nafion Thin Films, Langmuir, 10.1021/acs.langmuir.8b03396, 34, 50, 15483-15489, 2018.12, Proton conductivity of polyelectrolytes in the interfacial region with a solid is key to the performance of polyelectrolyte-based fuel cells. The proton conductivity of Nafion thin films was examined as a function of the thickness along both directions, normal and parallel to the interface. Neutron reflectivity measurements revealed that a water-containing multilamellar structure was formed at the substrate interface. The presence of the interfacial layer, or the two-dimensional proton-conductive pathway, suppressed and enhanced the out-of-plane and in-plane proton conductivities, respectively. The method of proton conductivity in the interfacial region differed from that in the bulk, namely, the Grotthuss mechanism. Using laminated films, we conclude by showing that the proton conductivity in the Nafion thin film changes on the basis of the interface-to-volume ratio. This knowledge will be helpful for the design of devices containing polyelectrolytes with solid materials..
Membership in Academic Society
  • The Society of Polymer Science, Japan
  • The Society of Rheology, Japan
  • The Adhesion Society of Japan
  • The Japanese Society for Neutron Science
  • The Chemical Society of Japan
  • American Physical Society
  • Materials Research Society