Toshio Nishi
Tohoku University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Toshio Nishi.
Physical Review Letters | 2011
Y.H. Liu; Dong Wang; Ken Nakajima; W. Zhang; Akihiko Hirata; Toshio Nishi; A. Inoue; Mingwei Chen
We report nanoscale mechanical heterogeneity of a metallic glass characterized by dynamic force microscopy. Apparent energy dissipation with a variation of ~12%, originating from nonuniform distribution of local viscoelasticity, was observed. The correlation length of the heterogeneity was measured to be ~2.5 nm, consistent with the dimension of shear transformation zones for plastic flow. This study provides the first experimental evidence on the nanoscale viscoelastic heterogeneity in metallic glasses and may fill the gap between atomic models and macroscopic glass properties.
Journal of Physics: Conference Series | 2009
Toshio Nishi; So Fujinami; Ken Nakajima; Hidekazu Sugimori; M Hatta; M Weber; Hiroshi Jinnai
We have been developing new techniques to evaluate polymer nano-alloys and nano-composites. This nanotechnology can be classified into nano-three dimensional (3D) measurement, nano-physical properties evaluation systems, and nano-spectroscopy. As for the nano-3D measurement, we developed polymer oriented energy-filtered 3D transmission electron microscopy. With this method, we can access important 3D structural and elemental information that cannot be obtainable from ordinary TEM. Nano-physical properties evaluation systems were also established by developing atomic force microscopy force-distance curve measurement. The distribution of mechanical properties such as Youngs modulus and adhesive energy was quantitatively obtained on high lateral resolution. These methods give new pieces of information unobtainable by the conventional techniques on polymer nanotechnology. Several results are shown here.
Journal of Physics: Conference Series | 2009
Haruko Saito; Masahiro Yoshinaga; Takaaki Mihara; Toshio Nishi; Hiroshi Jinnai
The time evolution of the phase separating pattern during the spinodal decomposition (SD) of a specimen was observed at the same volume of the specimen using X-ray computerized microtomography (X-ray CT). A careful examination of time-dependent three-dimensional (3D) images revealed that bridge-like domains played an important role in the phase separation dynamics. In the course of the SD, some bridge-like domains became thicker, while the others became thinner. It was found that the pressure difference across the interface, which is quantified through the mean curvature of the interface, influences such interface dynamics.
Polymer | 2010
Dong Wang; So Fujinami; Ken Nakajima; Shigeki Inukai; Hiroyuki Ueki; Akira Magario; Toru Noguchi; Morinobu Endo; Toshio Nishi
Carbon | 2010
Dong Wang; So Fujinami; Ken Nakajima; Ken-ichi Niihara; Shigeki Inukai; Hiroyuki Ueki; Akira Magario; Toru Noguchi; Morinobu Endo; Toshio Nishi
Composite Interfaces | 2009
Sae Nagai; So Fujinami; Ken Nakajima; Toshio Nishi
Polymer Physics: From Suspensions to Nanocomposites and Beyond | 2010
Ken Nakajima; Toshio Nishi
Characterization Techniques for Polymer Nanocomposites | 2012
Ken Nakajima; Dong Wang; Toshio Nishi
Journal of the Society of Rubber Industry,Japan | 2011
So Fujinami; Ken Nakajima; Toshio Nishi
Chinese Journal of Polymer Science | 2010
Chang-jiang You; Jin-guo Xu; Yi-zheng Zeng; Yao Li; De-min Jia; Toshio Nishi