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The mechanochemical fabrication of the composites between carbon fibers (CFs) and nylon-6 (N6) was investigated using a milling process. By the milling, defected surfaces were generated on CFs to obtain the homogeneous length with preserving the cylindrical shape of CF. Fourier transform infrared spectra revealed that the band intensities due to CO, C–N and O–H bondings increased with the milling. The band position of C–N was shifted to a higher wavenumber, while that of CO did not change, implying that the main chain of N6 was dissociated at the C–N neighboring the CO bonds by the force, and subsequently, new bonds between the N atoms of the activated N6 and the C atoms on CFs would be formed. Therefore, the efficient fabrication of the CF/N6 composite fibers with the interfacial bondings was achieved using the mechanochemical reaction.

This paper deals with a minor metal free, plate-type thermoelectric power generator, comprising an Fe plate with an Al layer. The dimensions of the power generator were reduced significantly compared with the previously reported power generator without decreasing the thermoelectromotive force, which was measured in the open circuit condition. A multi-layered thermoelectric power generator was fabricated by stacking up to five layers of these small thermoelectric plates. Stacking the thermoelectric plates in this way was found to be effective not only for increasing the thermoelectromotive force but also the efficiency for power generation, which was measured in the closed circuit condition. In this study, the maximum power was generated when the number of stacked thermoelectric plates was 4, and the value was 0.22 µW at a temperature difference of 40 K. From the maximum power, the power density was determined to be 7.3 W m−3.

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