Nagoya University · 공학
이 교수의 연구실은 페로브스카이트 산화물 나노입자, 특히 PbTiO₃와 BaTiO₃의 나노스케일에서의 상전이 및 표면 구조적 비정상성에 중점을 두고 있다. 입자 크기의 영향으로 인한 페로일렉트릭 전이 온도의 감소, 표면 릴랙세이션, 임계 크기 이하에서의 페로일렉트릭 상태 불안정성 등 나노물성의 원자적 메커니즘을 규명하고자 한다. 또한 나노소재의 고비율 구조 제작 기술과 생물학적 응용, 예를 들어 대장암에서의 MCAK 발현과 간세포암의 간줄기세포 기원 가설 등 다학제적 연구도 진행 중이다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
We report a size effect on the ferroelectric phase transition in ${\mathrm{PbTiO}}_{3}$ ultrafine particles. The samples were synthesized by an alkoxide method. The size was determined by x-ray analysis with the aid of Scherrer's equation. When the particle size is less than 50 nm, the transition temperature ${T}_{c}$, determined by Raman scattering, decreases from its bulk value (500 \ifmmode^\circ\else\textdegree\fi{}C) as the size decreases. The temperature ${T}_{c}$ is described by an empiri
Lattice relaxation on the surface of ${\mathrm{PbTiO}}_{3}$ and ${\mathrm{BaTiO}}_{3}$ is investigated under the assumption that the spurious lattice expansion in perovskite nanocrystals is caused by the surface relaxation. By comparing the observed peak position and full width at half maximum with those of the calculated x-ray diffraction patterns from a cubic lattice containing surface relaxation, the maximum relaxation on the surface of ${\mathrm{PbTiO}}_{3}$ is found to be 0.035 nm, and 0.01
In this review, we discuss the progress of emerging dry processes for nanoscale fabrication of high-aspect-ratio features, including emerging design technology for manufacturability. Experts in the fields of plasma processing have contributed to addressing the increasingly challenging demands of nanoscale deposition and etching technologies for high-aspect-ratio features. The discussion of our atomic-scale understanding of physicochemical reactions involving ion bombardment and neutral transport
Mitotic centromere-associated kinesin (MCAK) is a microtubule depolymerase that is essential for proper kinetochore-microtubule attachment during spindle formation. Overexpression of MCAK has been correlated with aggressive forms of carcinoma, resulting in poor prognosis of colorectal cancer. The purpose of this study was to quantify MCAK expression in malignant and benign colorectal tissues and to determine if MCAK expression levels correlate with clinicopathologic factors and prognosis in colo
The finite size effect on the phase transition in PbTiO 3 fine particles is described. Very small crystals with an average diameter of 14.2 nm were obtained by lowering the calcination temperature to 400° C. Raman scattering measurements of such fine particles were carried out to study the dependence of the phase transition temperature on the particle size. The X-ray diffraction pattern was also measured to study the tetragonality, c / a ratio. The results strongly suggest the presence of a crit
Recent evidence suggests that some cancers may originate from cancer stem cells, which may derive from carcinogenesis of normal stem cells. A hepatic progenitor cell population, which gives rise to hepatocytes and cholangiocytes, has been suggested in humans, though whether these cells can give rise to malignant tumors has not been confirmed. We report here a case of an alpha-fetoprotein (AFP)-producing intrahepatic cholangiocarcinoma (ICC) in an 81-year-old woman with chronic hepatitis C viral
In this review, we discuss the progress of emerging dry processes for nanoscale fabrication. Experts in the fields of plasma processing have contributed to addressing the increasingly challenging demands in achieving atomic-level control of material selectivity and physicochemical reactions involving ion bombardment. The discussion encompasses major challenges shared across the plasma science and technology community. Focus is placed on advances in the development of fabrication technologies for
