Waseda University · Materials Science
Professor Yoshihiko Arao's research lab specializes in advanced composite materials and nanomaterials, with a strong focus on carbon fiber-reinforced plastics (CFRP) and graphene-based nanocomposites. The lab investigates the thermal, moisture-induced, and viscoelastic behaviors of CFRP to enhance dimensional stability and mechanical performance in aerospace and structural applications. A key research direction involves developing scalable, high-yield methods for producing high-quality graphene through mechanochemical exfoliation, particularly using soluble graphite and liquid-phase exfoliation techniques. The lab also explores the fundamental mechanisms of graphene dispersion and aggregation in polymer matrices, aiming to optimize processing conditions for superior nanocomposite properties.
Figures are computed from collected data and may differ slightly.
Thermal deformation analysis was performed on a carbon fiber reinforced plastic (CFRP) mirror with sandwich structure. To obtain unexpected asymmetry of the surface sheet, we investigated the deformation of a quasi-isotropic laminate under hot and humid conditions. Despite the symmetric lay-up, quasi-isotropic laminate deforms into twisted saddle shape with time, and this deformation could be simulated by assuming ply angle misalignment. Then, the elastic moduli of honeycomb cores were calculate
Developing a mass production method for graphene is essential for practical usage of this remarkable material. Direct exfoliation of graphite in a liquid is a promising approach for production of high quality graphene. However, this technique has three huge obstacles to be solved; limitation of solvent, low yield and low quality (<i>i.e.</i>, multilayer graphene with a small size). Here, we found that soluble graphite produced by mechanochemical reaction with salts overcomes the above three draw
The moisture absorption behavior of carbon fiber-reinforced plastic (CFRP) and its effect on dimensional stability were examined. Moisture diffusivity in CFRP was determined by measuring a specimen's weight during the moisture absorption test. Three types of CFRP specimens were prepared: a unidirectionally reinforced laminate, a quasi-isotropic laminate and woven fabric. Each CFRP was processed into two geometries — a thin plate for determination of diffusivity and a rod with a square cross-sect
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