A5020725398- Solidification and crystal growth phenomena
- nanoparticles nucleation surface interactions
- Advanced Semiconductor Detectors and Materials
- Chalcogenide Semiconductor Thin Films
- Planetary Science and Exploration
- Crystallization and Solubility Studies
- Semiconductor Quantum Structures and Devices
- Silicon and Solar Cell Technologies
- Field-Flow Fractionation Techniques
- Metallurgical Processes and Thermodynamics
- Advanced Thermoelectric Materials and Devices
- Magnetic and Electromagnetic Effects
- Spaceflight effects on biology
- Spacecraft and Cryogenic Technologies
- Enzyme Structure and Function
- Calibration and Measurement Techniques
- Semiconductor materials and interfaces
- Astro and Planetary Science
- Spacecraft Design and Technology
- Freezing and Crystallization Processes
- Rocket and propulsion systems research
- Material Dynamics and Properties
- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Astrophysics and Star Formation Studies
Japan Aerospace Exploration Agency
2016-2025
Institute of Space and Astronautical Science
2015-2024
The Graduate University for Advanced Studies, SOKENDAI
2007-2024
Hokkaido University
2023
Shizuoka University
2010-2020
International Society of Automation
2018
National Sagamihara Hospital
2016
Advanced Engineering Services (Japan)
2015
Shizuoka Institute of Science and Technology
2010
Osaka University
2010
In this study, we proposed a moved-view analysis, method for obtaining the Soret coefficient S T by analyzing interference fringe change during field-of-view movement in steady state. This analysis was designed to solve problem that sign of concentration gradient could also be reversed if plot distribution only slightly shifted owing narrow field view. The data obtained from experiment conducted measure at International Space Station were analyzed using analysis. For linearity induced effect...
The abundant forms in which the major elements universe exist have been determined from numerous astronomical observations and meteoritic analyses. Iron (Fe) is an exception, that only depletion of gaseous Fe has detected interstellar medium, suggesting condensed into a solid, possibly astronomically invisible metal. To determine primary form Fe, we replicated formation grains ejecta evolved stars by means microgravity experiments. We found sticking probability for extremely small; several...
In x Ga1-x Sb is an important material that has tunable properties in the infrared (IR) region and suitable for IR-device applications. Since quality of crystals relies on growth conditions, process alloy semiconductors can be examined better under microgravity (μG) conditions where convection suppressed.To investigate dissolution via a sandwiched structure GaSb(seed)/InSb/GaSb(feed) normal μG conditions.In were grown at International Space Station (ISS) similar experiment was conducted...
Abstract The growth of high-quality InGaSb crystals by Vertical Gradient Freezing (VGF) under microgravity was numerically simulated. Machine learning tools were used to optimize the conditions. study focuses on controlling interface shape which directly affects quality and homogeneity grown crystals. Initially, Bayesian optimization utilized search for most favorable conditions that promote a desirable flatter shape. Afterward, reinforcement model developed. system subjected lower...
Temperature dependence of interdiffusion coefficient In–Sn was measured by a capillary method under static magnetic field. The obtained diffusion data agreed well with in microgravity environment at lower temperature range. application field could be good substitute for accurate measurement coefficients substitution utilization the environment.
Abstract Microgravity crystal growth experiment for the of In 0.11 Ga 0.89 Sb was performed at Chinese recoverable satellite through space program SJ-10. This is aimed to understand melt formation and kinetics x 1− solid solution with higher indium composition, because their segregation coefficient than crystals lower compositions. The target composition uniformity were achieved rate under microgravity, whereas in not normal gravity. dissolution affected mainly by steady state equilibrium...
Abstract The reproducibility of biomacromolecular crystallization (tetragonal and orthorhombic lysozyme crystals) was studied by monitoring the evolution protein concentration during process using Mach‐Zehnder interferometer. It found that formation both tetragonal crystals exhibited poor reproducibility. When occurred under isothermal conditions, in solution varied differently different experiments identical conditions (for types crystals). Moreover, case (under either or thermal gradient...
Alumina (Al2O3) is believed to be the first major condensate form in gas outflow from oxygen-rich evolved stars because of refractoriness and that α-Al2O3 (corundum, most stable polymorph) a potential origin 13 μm feature appears close stars. However, no one has directly reproduced experimentally, it remained as noteworthy unidentified infrared band. Here, we report nucleation experiments on Al2O3 nanoparticles monitored by specially designed spectrometer microgravity environment sounding...
InGaSb ternary alloys were grown from GaSb (111)A and B faces (Ga Sb faces) under microgravity conditions on board the International Space Station by a vertical gradient freezing method. The dissolution process of Ga orientation-dependent growth properties analysed. GaSb(111)B was greater than that (111)A, which found remaining undissolved seed feed crystals. higher face explained based number atoms at face, its bonding with next atomic layer. interface shape almost flat in both cases....
Thermoelectric power generators require semiconductor materials with controlled phonon and free charge carrier transport properties. This could be achieved by changing their molecular lattice dynamics through introducing/controlling structural imperfections (defects engineering). The such as point defects compositional segregations in a multicomponent alloy are observed experimentally, impact on electron properties was explained. thermoelectric of III-V ternary InGaSb improved the presence...
The volume-averaging continuum technique has been utilized to obtain numerical predictions for the transport phenomena occurring during dissolution process of GaSb into InSb melt in a sandwich system. Dissolution and subsequent growth this system are achieved by application temperature gradient. developed model was first verified two test cases [(i) fluid/solid conjugate heat transfer (ii) solidification binary system]. code then simulate GaSb/InSb/GaSb present results show that provides...
The present work is concerned with the real time in situ visualization of crystallization processes inside strongly supercooled silicate melts using optical projection technique. experiments are carried out for forsterite composition under container-less conditions. Starting material heated above its liquidus temperature (2169 K) a high power CO2 laser and initiated following rapid cooling. Three different values supercooling (ΔT≈320, 400, 500 K, calculated respect to as reference)...
On the thermodynamic condition for forming a metastable phase from undercooled melt in containerless state, we had proposed criterion that crystals will preferentially form if they have smaller entropy of fusion than equilibrium (Kuribayashi et al., Mater. Sci. Eng., A 449–451, 675 (2007)). This is being applied to materials exhibit faceted interface, such as semiconductors and oxides. However, no experimental data support this been obtained. From point, used an aerodynamic levitator tool...