Hokkaido University · 재료과학
Seiichi Watanabe 교수의 연구실은 나노소재의 합성 및 물성 제어를 중심으로, 고에너지 플라즈마 공정을 활용한 흑색 TiO₂ 나노입자 개발과 레이저 유도 나노조직 형성 메커니즘을 연구하고 있습니다. 특히 태양열 변환에 최적화된 나노소재의 설계 및 표면 반응 메커니즘을 해석함으로써 에너지 효율 향상을 목표로 하고 있으며, 전자현미경 기반의 실시간 나노구조 관찰 기술을 적극 활용하고 있습니다. 이는 나노소재의 기계적·화학적 특성 제어에 기여하는 기초 연구입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Black TiO2 nanoparticles (b-TiO2) with superior solar–thermal water evaporation performance are prepared using a one-step solution plasma process (SPP) in ambient conditions. It is found that radicals that are generated during SPP play a critical role in b-TiO2 formation by comparing several water–alcohol electrolyte environments for the SPP synthesis. Our results show that the radical-induced formation of a black TiO2–x layer on the Ti electrode is necessary for b-TiO2 formation, which was igno
An in situ observation of the formation of a laser-irradiation-induced nanodot array on a Si surface was performed using a pulsed-laser-equipped high-voltage electron microscope (laser-HVEM). Under multiple nanosecond (ns) pulsed laser irradiation shots, atomic clusters were first formed and distributed on the surface in order to grow them epitaxially into protruded dots with diameters of ten nanometers or less. This is followed by their diffusion induced by successive laser shots to cannibalize
Electron microscopic studies have been made of austenite partially transformed from prior martensitic structure in the temperature range between Ac1and Ac3.It has been found that each acicular austenite grain which has been formed from ferrite laths with same orientation has same crystallographic orientation and the austenite has the KURDJUMOV-SACHS orientation relationship with the ferrite. The both lath boundary and cementite play an important role in the formation of acicular austenite grains
