Tokyo Institute of Technology · 재료과학
모리카와 준코 교수의 연구실은 열역학적 성질, 특히 열확산도와 열전도도의 나노스케일 측정을 핵심으로 하며, 고해상도 온도파 분석(TWA) 및 적외선 영상, 마이크로센서 기반 기법을 활용해 투명·연성 고분자 필름, 결정, 생체재료 등 다양한 물질의 열적 특성을 정밀하게 분석합니다. 특히 나노구조 표면, 레이저 구조화된 영역, 생물막 등에서의 열전달 메커니즘과 이질성에 기인한 열성질 변화를 규명하는 데 초점을 맞추고 있습니다. 연구는 열전도성과 기계적·광학적 성질 간의 상관관계를 탐구하며, 응용 분야로는 고집적 전자소자, 고성능 광학소재, 생체모방 재료 등이 포함됩니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The heat transport properties of aromatic polyimide thin films have become more important in the use for the electric insulation in the microelectronic devices with highly integrated circuits. The various kinds of measuring methods have been applied to obtain the anisotropic thermal conductivity and thermal diffusivity of thin films, however, if the specimens are soft and transparent, the conventional methodology requires highly advanced technology in preparing the specimens for the measurement
Thermal diffusivity and thermal conductivity of single crystals of Nd3+ doped GdVO4, YVO4, LuVO4, and Y3Al5O12 are precisely measured over a wide range of doping concentration from 0.5to15at.% by temperature wave analysis. Thermal diffusivity serves as the most sensitive parameter to detect the effect of doping on thermal properties, where Nd3+ doped GdVO4 exhibits a decrease in thermal diffusivity (it has changed about 20% in their values in the c axis) but an increase in heat capacity (only 1.
Temperature diffusivity of laser micro-structured regions in sapphire is determined by a temperature wave method with a lateral resolution reduced to ~10 microm using a directly sputtered micro-sensor and heater. A record high reduction of the temperature diffusivity of sapphire by 12% from its (1.26+/-0.02) x 10(-5)m(2)/s in-bulk value inside the femtosecond laser-structured volumes is determined; in a BK7 glass (~4.8x10(-7) m(2)/s), a 2% decrease of the thermal diffusivity has been observed. O
Inter-related mechanical, thermal, and optical macroscopic properties of biomaterials are defined at the nanoscale by their constituent structures and patterns, which underpin complex functions of an entire bio-object. Here, the temperature diffusivity of a cicada (Cyclochila australasiae) wing with nanotextured surfaces was measured using two complementary techniques: a direct contact method and IR imaging. The 4-6-μm-thick wing section was shown to have a thermal diffusivity of α⊥ = (0.71 ± 0.
The high-order harmonics of temperature wave were detected in a thin film by inputting a square pulse train with a variable duty factor to generate temperature modulation. In Fourier analysis, the harmonics were observed up to the 42 th order and the mathematical rule was experimentally confirmed. This principle was applied to a technique called “Fourier transform thermal analysis,” which made it possible to determine simultaneously thermal diffusivity and heat capacity per unit volume as a func
Hyperspectral imaging is now augmented by separation of the birefringence, dichroism and orientation function at the same wavelength and pixel by combining Malus and Beer–Lambert laws.
Domestic (<i>Bombyx mori</i>) and wild (<i>Antheraea pernyi</i>) silk fibers were characterised over a wide spectral range from THz 8 cm -1 ( λ = 1.25 mm, f = 0.24 THz) to deep-UV 50 × 10 3 cm - 1 ( λ = 200 nm, f = 1500 THz) wavelengths or over a 12.6 octave frequency range. Spectral features at β-sheet, α-coil and amorphous fibroin were analysed at different spectral ranges. Single fiber cross sections at mid-IR were used to determine spatial distribution of different silk constituents and reve
Grid polarisers 3D-printed out of commercial acrilic resin were tested for the polariser function and showed spectral regions where the dichroic ratio D-R > 1 and < 1 implying importance of molecular and/or stress induced anisotropy. Metal-coated 3D-printed THz optical elements can find a range of applications in intensity and polarization control of IR-THz beams. The used 3D printing method allows for fabrication of an arbitrary high aspect ratio grid polarisers. Polarization analysis of
A non-contact determination of thermal diffusivity and spatial distribution of temperature on tens-of-micrometers scale is demonstrated by thermal imaging. Temperature localization and a heat flow have been in situ monitored with ∼ 10 ms temporal resolution in Kapton polymer films structured by femtosecond laser pulses. The structured regions can localize temperature and create strong thermal gradients of few degrees over tens-of-micrometers (∼ 0.1 K/μm). This is used to induce an anisotropy in
E-beam exposure unzips beta-sheets in crystalline domains of silk fibroin and makes it water-soluble, enabling its usage as an aqueous-based electron beam lithography resist.
