Researcher Database

Ken-ichiro Murata
Institute of Low Temperature Science Frontier Ice and Snow Science
Assistant Professor

Researcher Profile and Settings

Affiliation

  • Institute of Low Temperature Science Frontier Ice and Snow Science

Job Title

  • Assistant Professor

Research funding number

  • 60646272

ORCID ID

J-Global ID

Research Interests

  • Ice   Optical Microscopy   Surface Melting   Crystal Growth   濡れ   相転移ダイナミクス   

Research Areas

  • Nanotechnology/Materials / Thin-film surfaces and interfaces
  • Nanotechnology/Materials / Crystal engineering
  • Natural sciences / Bio-, chemical, and soft-matter physics

Academic & Professional Experience

  • 2013 東京大学 生産技術研究所 特任助教

Association Memberships

  • JAPANESE ASSOCIATION FOR CRYSTAL GROWTH   THE PHYSICAL SOCIETY OF JAPAN   

Research Activities

Published Papers

  • Takako Igarashi, Masato Hoshi, Koichi Nakamura, Takeshi Kaharu, Ken-ichiro Murata
    The Journal of Physical Chemistry C 2020/02/20 [Refereed][Not invited]
  • Ken Nagashima, Josée Maurais, Ken-ichiro Murata, Yoshinori Furukawa, Patrick Ayotte, Gen Sazaki
    Crystals 10 (2) 72 - 72 2073-4352 2020/01 [Refereed][Not invited]
  • Ken-ichiro Murata, Hajime Tanaka
    Proceedings of the National Academy of Sciences Proceedings of the National Academy of Sciences 116 (15) 7176 - 7185 2019/04/09 [Refereed][Not invited]
  • Yoshinori Furukawa, Ken Nagashima, Shunichi Nakatsubo, Salvador Zepeda, Ken-ichiro Murata, Gen Sazaki
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377 (2146) 20180393 - 20180393 1364-503X 2019/04 [Refereed][Not invited]
  • Jialu Chen, Ken Nagashima, Ken-ichiro Murata, Gen Sazaki
    Crystal Growth & Design American Chemical Society ({ACS}) 2019/01/02 [Refereed][Not invited]
  • Ken-ichiro Murata, Ken Nagashima, Gen Sazaki
    Physical Review Letters American Physical Society ({APS}) 122 (2) 0031-9007 2019/01 [Refereed][Not invited]
  • Ken-ichiro Murata, Ken Nagashima, Gen Sazaki
    Physical Review Materials American Physical Society ({APS}) 2 (9) 2475-9953 2018/09/10 [Refereed][Not invited]
  • Ken Nagashima, Gen Sazaki, Tetsuya Hama, Ken-ichiro Murata, Yoshinori Furukawa
    Crystal Growth & Design American Chemical Society ({ACS}) 2018/07/05 [Refereed][Not invited]
  • Masahiro Inomata, Ken-ichiro Murata, Harutoshi Asakawa, Ken Nagashima, Shunichi Nakatsubo, Yoshinori Furukawa, Gen Sazaki
    Crystal Growth & Design American Chemical Society ({ACS}) 18 (2) 786 - 793 1528-7483 2018/01/04 [Refereed][Not invited]
  • Why is the Surface of Ice Wet?
    Ken-ichiro Murata
    日本物理学会誌 72 (9) 669 - 674 2017/09 [Refereed][Invited]
  • Shogo Tachibana, Akira Kouchi, Tetsuya Hama, Yasuhiro Oba, Laurette Piani, Iyo Sugawara, Yukiko Endo, Hiroshi Hidaka, Yuki Kimura, Ken-ichiro Murata, Hisayoshi Yurimoto, Naoki Watanabe
    Science Advances American Association for the Advancement of Science ({AAAS}) 3 (9) eaao2538  2017/09 [Refereed][Not invited]
  • Yoshinori Furukawa, Ken Nagashima, Shun-ichi Nakatsubo, Izumi Yoshizaki, Haruka Tamaru, Taro Shimaoka, Takehiko Sone, Etsuro Yokoyama, Salvador Zepeda, Takanori Terasawa, Harutoshi Asakawa, Ken-ichiro Murata, Gen Sazaki
    Scientific Reports Springer Nature 7 43157 - 43157 2017/03/06 [Refereed][Not invited]
  • Ken-ichiro Murata, Hajime Tanaka
    Science Advances American Association for the Advancement of Science ({AAAS}) 3 (2) e1602209  2017/02 [Refereed][Not invited]
  • Ken-ichiro Murata, Harutoshi Asakawa, Ken Nagashima, Yoshinori Furukawa, Gen Sazaki
    Proceedings of the National Academy of Sciences Proceedings of the National Academy of Sciences 113 (44) E6741 - E6748 2016/10 [Refereed][Not invited]
  • Gen Sazaki, Ken Nagashima, Ken-ichiro Murata, Yoshinori Furukawa
    Progress in Crystal Growth and Characterization of Materials Elsevier {BV} 62 (2) 408 - 412 2016/06 [Refereed][Not invited]
  • Ken Nagashima, Gen Sazaki, Tetsuya Hama, Harutoshi Asakawa, Ken-ichiro Murata, Yoshinori Furukawa
    Crystal Growth & Design American Chemical Society ({ACS}) 16 (4) 2225 - 2230 2016/04/06 [Refereed][Not invited]
  • Ken-ichiro Murata, Hajime Tanaka
    Proceedings of the National Academy of Sciences 112 (19) 5956 - 5961 0027-8424 2015/04 [Refereed][Not invited]
  • Ken-ichiro Murata, Harutoshi Asakawa, Ken Nagashima, Yoshinori Furukawa, Gen Sazaki
    Physical Review Letters American Physical Society ({APS}) 115 (25) 2015 [Refereed][Not invited]
  • Ken-ichiro Murata, Harutoshi Asakawa, Ken Nagashima, Yoshinori Furukawa, Gen Sazaki
    Physical Review Letters American Physical Society ({APS}) 115 (25) 2015 [Refereed][Not invited]
  • Ken-ichiro Murata, Hajime Tanaka
    Nature Communications Springer Nature 4 2013/11 [Refereed][Not invited]
  • Ken-Ichiro Murata, Hajime Tanaka
    AIP Conference Proceedings 1518 284 - 287 0094-243X 2013 [Refereed][Not invited]
     
    Contrary to the conventional wisdom that there exists only one unique liquid state for any material, there are growing experimental and numerical evidence for the existence of more than two liquid states in a single component substance. The transition between them is called liquid-liquid transition (LLT). LLT has attracted considerable attention because of its counterintuitive nature and its importance in the fundamental understanding of the liquid state. However, the physical nature of the transition has remained elusive. Particularly for water, the possible existence of LLT has special implications not only on its fundamental understanding, but also on a link of various thermodynamic and transport anomalies with critical anomaly associated with LLT. In this paper, we show experimental indications for a LLT in aqueous solutions of glycerol. We demonstrated that LLT proceeds through two types of kinetics characteristic of the first order transition: nucleation-growth (NG) and spinodal-decomposition (SD) type transformation. We also reveal that local tetrahedral ordering of water molecules play a key role, which is suggestive of the presence of LLT in pure water. © 2013 American Institute of Physics.
  • Christian L. Klix, Ken-Ichiro Murata, Hajime Tanaka, Stephen R. Williams, Alex Malins, C. Patrick Royall
    Scientific Reports 3 (1) 2045-2322 2013 [Refereed][Not invited]
     
    Colloidal clusters are an unusual state of matter where tunable interactions enable a sufficient reduction in their degrees of freedom that their energy landscapes can become tractable - they form a playground for statistical mechanics and promise unprecedented control of structure on the submicron lengthscale. We study colloidal clusters in a system where a short-ranged polymer-induced attraction drives clustering, while a weak, long-ranged electrostatic repulsion prevents extensive aggregation. We compare experimental yields of cluster structures with theory which assumes simple addition of competing isotropic interactions between the colloids. Here we show that for clusters of size 4 ≤ m ≤ 7, the yield of minimum energy clusters is much less than expected. We attribute this to an anisotropic self-organized surface charge distribution which leads to unexpected kinetic trapping. We introduce a model for the coupling between counterions and binding sites on the colloid surface with which we interpret our findings.
  • Ken-ichiro Murata, Hajime Tanaka
    NATURE MATERIALS Springer Nature 11 (5) 436 - 443 1476-1122 2012/05 [Refereed][Not invited]
     
    The existence of more than two liquid states in a single-component substance and the ensuing liquid-liquid transitions (LLTs) has attracted considerable attention because of its counterintuitive nature and its importance in the fundamental understanding of the liquid state. Here we report direct experimental evidence for a genuine (isocompositional) LLT without macroscopic phase separation in an aqueous solution of glycerol. We show that liquid I transforms into liquid II by way of two types of kinetics: nucleation and growth, and spinodal decomposition. Although liquid II is metastable against crystallization, we could access both its static and dynamical properties experimentally. We find that liquids I and II differ in density, refractive index, structure, hydrogen bonding state, glass transition temperature and fragility, and that the transition between the two liquids is mainly driven by the local structuring of water rather than of glycerol, suggesting a link to a plausible LLT in pure water.
  • Ken-ichiro Murata, Hajime Tanaka
    NATURE COMMUNICATIONS Springer Nature 1 (2) 1  2041-1723 2010/05 [Refereed][Not invited]
     
    Even a single-component liquid may have more than two liquid states. The transition between them is called a 'liquid-liquid transition' (LLT). Such LLTs have recently attracted considerable attention mainly because of the fundamental interest in the physical origin of this counter-intuitive phenomenon. In this study, we report the first observation of wetting effects on LLT for a molecular liquid, triphenyl phosphite. We find a transition from partial to complete wetting for nucleation-growth-type LLT when approaching the spinodal temperature of LLT. Some features unique to LLT are also revealed, reflecting for example the non-conserved nature of its order parameter. We also find that the wetting behaviour is not induced by dispersion forces, but by weak hydrogen bonding to a solid substrate, implying its important role in the LLT itself. Using wetting effects may open a new possibility to control kinetics and spatial patterns of nucleation-growth-type LLT.
  • Rei Kurita, Ken-ichiro Murata, Hajime Tanaka
    NATURE MATERIALS Springer Nature 7 (8) 647 - 652 1476-1122 2008/08 [Refereed][Not invited]
     
    Matter in its liquid state is convenient for processing and controlling chemical reactions, owing to its fluidity. Recently much evidence has been accumulated for the existence of a liquid-liquid transition (LLT) in single-component liquids. Here, we report that we can control, by the LLT of a molecular liquid, triphenyl phosphite (TPP), the fluidity and miscibility of its mixture with another molecular liquid. For a mixture of TPP with toluene or aniline, we find that both liquid I and II mix well and liquid II remains in a 'liquid' state, in contrast to pure TPP, where liquid II is a non-ergodic amorphous state. This is the first example of a 'true' LLT in a molecular liquid. Furthermore, we find demixing induced by the LLT for a mixture of TPP with diethyl ether or ethanol. These findings will open a new phase of research towards various applications of the LLT.
  • Hajime Tanaka, Rei Kurita, Ken-ichiro Murata
    COMPLEX SYSTEMS-BOOK 1 982 24 - 33 0094-243X 2008 [Refereed][Not invited]
     
    Recently it was revealed that even a single-component liquid can have more than two liquid states. The transition between these liquid states is called "liquid-liquid transition". This phenomenon has attracted a considerable attention because of its counter-intuitive character and the fundamental importance for our understanding of the liquid state of matter. The connection between the liquid-liquid transition and polyamorphism is also an interesting issue. In many cases, liquid-liquid transitions exist in a region which is difficult to access experimentally. Because of this experimental difficulty, the physical nature and kinetics of the transition remains elusive. However, a recent finding of liquid-liquid transition in molecular liquids opens up a possibility to study the kinetics in detail. Here we report the first detailed comparison between experiments and a phenomenological theory for the liquid-liquid transition of a molecular liquid, triphenyl phosphite. Both nucleation-growth-type and spinodal-decomposition-type liquid-liquid transformation are remarkably well reproduced by a two-order-parameter model of liquid that regards the liquid-liquid transition as the cooperative formation of locally favored structures. This may shed new light on the nature and the dynamics of the liquid-liquid transition. We also show evidence that this second order parameter controls the fragility of the liquid. We also discuss a possibility of controlling liquid-liquid transition by spatial confinement. Remaining open questions on the nature of the transition are also discussed.
  • Ken-ichiro Murata, Rei Kurita, Hajime Tanaka, Michio Tokuyama, Irwin Oppenheim, Hideya Nishiyama
    AIP 2008 [Refereed][Not invited]
  • K Murata, A Hanawa, R Nozaki
    JOURNAL OF APPLIED PHYSICS 98 (8) 084107  0021-8979 2005/10 [Refereed][Not invited]
     
    A test method to evaluate the complex permittivity of materials with thin configuration (thickness of 50-300 mu m) is presented. We evaluate the complex permittivity of materials with various mechanical and electrical characteristics (films, powders, and liquids) at frequencies from 100 MHz to 20 GHz and at temperatures from 293 to 353 K using an experimental method presented in this paper. We have developed a fixture having a circular parallel-plate capacitor which is suitable for the measurement of materials with thin configuration. Our method is based on theoretical consideration of wave propagation in the capacitor, which is associated with multiple reflections along the diameter of the sample. The consideration of time delay in the sample section makes it possible to evaluate the permittivity of high dielectric constant materials in the frequency range up to 20 GHz. In addition, some examples for the measurements show that the resolution with tan delta is as low as 0.001. Our method is powerful to understand the relation between dielectric properties and the microscopic dynamics of dielectric materials, because of the broadband measurement, and finally can be applied for various areas both in fundamental researches and practical applications. (c) 2005 American Institute of Physics.

MISC

Awards & Honors

  • 2020/03 The Physical Society of Japan Young Scientist Award of the Physical Society of Japan
     Elucidating the mechanism of surface melting of ice crystals 
    受賞者: Ken-ichiro Murata, Institute of Low Temperature Science, Hokkaido University
  • 2017/11 The Japanese Association for Crystal Growth The 15th JACG Young Researcher Award
     Elucidating the Thermodynamic Origin of Surface Melting on Ice Crystals 
    受賞者: Ken-ichiro Murata

Research Grants & Projects

  • 結晶-融液界面における階層的動力学
    文部科学省:科学研究費補助金 (若手研究(A))
    Date (from‐to) : 2016/04 -2019/03 
    Author : 村田憲一郎
  • 粉粒体における相転移ダイナミクスと非線形レオロジーの競合
    文部科学省:科学研究費補助金 (若手研究(B))
    Date (from‐to) : 2013/04 -2015/03 
    Author : 村田憲一郎

Educational Activities

Teaching Experience

  • Advanced Course in Phase Transition of Planetary Materials
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 理学院
    キーワード : 氷結晶,雪結晶,結晶成長.相転移,ダイナミクス


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