北海道大学 · 材料科学
Tajima教授の研究室は、光デバイスとバイオマテリアルの融合を柱とした先端的で応用指向の研究を展開しています。光スイッチング技術では、偏光を分離して高速かつ高効率に動作する全光スイッチの開発を進め、皮相的非線形性の遅れに依存しない超高速スイッチングを実現。一方で、細菌性セルロースを改質したナノセルロース材料の表面制御や、生体高分子の合成反応系を用いたバイオプラスチックの設計にも取り組んでおり、環境に配慮した次世代材料の創出を目指しています。
Figures are computed from collected data and may differ slightly.
We propose a polarization-discriminating Mach-Zehnder (PDMZ) all-optical switch. The switching speed of this PDMZ all-optical switch is not limited by the slow relaxation time of highly efficient incoherent nonlinearities. We demonstrate a squarelike modulation characteristic, which is necessary in most switching applications, at a switching speed (on-off time) of 40 ps. We also demonstrate ultrafast switching at a detector limited speed of ∼8 ps.
Surface modification of nanofibrillated bacterial cellulose (NFBC) with methyltrimethoxysilane was performed in water to hydrophobize its surface. A series of cellulose samples with different degrees of molar substitution of methyltrimethoxysilane was prepared by changing the NFBC:methyltrimethoxysilane ratio in the preparation. Detailed structural characterization of these samples, including their degrees of molar substitution and crystallinity, was conducted by X-ray diffraction, Fourier-trans
In our previous paper, we synthesized poly-3-hydroxybutyrate [P(3HB)] by using the water-organic-solvent two-phase reaction system (TPRS), in which (R)-3-hydroxybutyrylCoA [(R)-3HBCoA] was continuously supplied to PHA synthase by the ester exchange reaction between CoA and thiophenol in thiophenyl (R)-3HB [(R)-3HBTP]. By applying TPRS to the screening, we found a lactate- (LA-) polymerizing enzyme from PHA synthases. The enzyme was an engineered PHA synthase, which stereoselectively copolymerize
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