An amphiphilic liquid-crystalline diblock copolymer, P40A37, exhibiting nano-scaled phase separation (NSPS) after annealing, was first used to record holographic gratings. Upon irradiation of two coherent laser beams,...
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An amphiphilic liquid-crystalline diblock copolymer, P40A37, exhibiting nano-scaled phase separation (NSPS) after annealing, was first used to record holographic gratings. Upon irradiation of two coherent laser beams, both a refractive-index grating (RIG) and a surface-relief grating (SRG) were formed in the polymer film. The SRG can be greatly enhanced by the NSPS process without the writing beams, accompanying with the greatly increase of the first-order diffraction efficiency. In the phase images of atomic force microscope (AFM), the nano-scaled phase domain was observed in the valley of SRG, with PEO cylinder about 10 nm dispersed in the ocean of LC mesogens, whereas no obvious phase domain was observed in the peak of SRG. A plausible grating structure before and after the NSPS process was proposed. The amphiphilic liquid-crystalline diblock copolymer can be adopted to write and read information securely by two processes.
In this paper, we propose product-type iterative methods with restart for avoiding breakdown. The residual vectors of product-type iterative methods are denoted as the product of a polynomial and the residual vector o...
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Ce0.8Gd0.2O1.9 (CGO) - MFe2O4 (M=divalent cation) is a composite-type oxygen-ionic and electronic mixed conductor. Dense nanocrysalline CGO-CoFe2O4 thin films with a thickness of approximately 1 µm were prepared ...
Ce0.8Gd0.2O1.9 (CGO) - MFe2O4 (M=divalent cation) is a composite-type oxygen-ionic and electronic mixed conductor. Dense nanocrysalline CGO-CoFe2O4 thin films with a thickness of approximately 1 µm were prepared on CGO porous substrates by a chemical solution spin-coating method. The oxygen permeable flux of the thin film was investigated in temperature range of 700°C–800°C without physical leak of N2 gas. The permeable flux depends on the measuring time, when the measuring temperature was kept at 750°C before increasing to 800°C. This fact suggests that the O2 permeable properties were affected by a slight change of the film morphology and the crystallinity.
Front Cover: Novel amphiphilic diblock and triblock LC copolymers with well‐defined structures were prepared by ATRP. The low content AZO in the triblock copolymer can be used as a photo‐trigger to regulate the non...
Front Cover: Novel amphiphilic diblock and triblock LC copolymers with well‐defined structures were prepared by ATRP. The low content AZO in the triblock copolymer can be used as a photo‐trigger to regulate the non‐AZO mesogens and change the PEO domains formed in microphase separation. Further details can be found in the Communication by H. Yu, A. Shishido, T. Ikeda, * and T. Iyoda on page 1594.
In order to develop non-platinum cathode catalysts for polymer electrolyte fuel cells （PEFCs）, transition metal oxides such as zirconium oxides, ZrO were examined and their electro-catalytic activity of the oxygen r...
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In order to develop non-platinum cathode catalysts for polymer electrolyte fuel cells （PEFCs）, transition metal oxides such as zirconium oxides, ZrO were examined and their electro-catalytic activity of the oxygen reduction reaction （ORR） and the stability in the acidic medium were evaluated. The electro-catalytic activity of the sputtered ZrO catalyst for ORR was measured by the electrochemical methods and its solubility in the acidic medium was measured by ICP analysis. The saturated solubility of the sputtered ZrO was 3.2×10 g-Zr dm'3 （0.32 ppm） in 1 mol dm HSO at 70℃. This shows that ZrO has high stability in acidic medium. The oxygen reduction current of ZrO was observed below 0.85V, which indicates a clear catalytic activity of ZrO for the ORR. The electro-catalytic activity of ZrO for ORR was affected by the sputtering conditions and was enhanced by Au.
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