Chiba, Ayano

写真a

Affiliation

Faculty of Science and Technology, Department of Physics (Yagami)

Position

Assistant Professor/Senior Assistant Professor

Related Websites

External Links

Career 【 Display / hide

  • 2003.04
    -
    2003.11

    Kyoto university, Department of physics, JSPS Fellow

  • 2003.12
    -
    2005.08

    Kyoto university, Department of engineerig, JSPS Fellow

  • 2005.09
    -
    2007.03

    Keio university, Instructor

  • 2007.02
    -
    2008.03

    Rutherford Appleton Laboratory, Visiting Scientist

  • 2007.04
    -
    2013.03

    Assistant Professor, Keio University

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Academic Background 【 Display / hide

  • 1998.03

    Kyoto University, Faculty of Science

    University, Graduated

  • 2000.03

    Kyoto University, Graduate School, Division of Natural Science, Department of Physics

    Graduate School, Completed, Master's course

  • 2003.11

    Kyoto University, Graduate School, Division of Natural Science, Department of Physics

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • PhD, Kyoto University, Coursework, 2003.11

 

Research Areas 【 Display / hide

  • Natural Science / Magnetism, superconductivity and strongly correlated systems (Physical Properties II)

Research Keywords 【 Display / hide

  • Liquids

  • Polymer

  • Disordered Systems

  • Molecular absorption

  • Phase Transition

 

Papers 【 Display / hide

  • Low energy excitation in liquid Sb and liquid Bi observed in inelastic x-ray scattering spectra

    Inui M., Kajihara Y., Hosokawa S., Chiba A., Nakajima Y., Matsuda K., Stellhorn J.R., Hagiya T., Ishikawa D., Uchiyama H., Tsutsui S., Baron A.Q.R.

    Journal of Physics Condensed Matter (Journal of Physics Condensed Matter)  33 ( 47 )  2021.11

    ISSN  09538984

     View Summary

    The dynamic structure factor S(Q, E), where Q and E are momentum and energy transfer, respectively, has been measured for liquid Sb, using inelastic x-ray scattering. A modified damped harmonic oscillator model function was applied to analyse S(Q, E) of liquid Sb and also to that of liquid Bi by Inui et al (2015 Phys. Rev. B 92, 054206). The obtained excitation energy was in fairly good agreement with that predicted by ab initio molecular dynamics simulations on these liquid semi-metals. The excitation energy of the longitudinal acoustic mode in liquid Sb and liquid Bi exhibits flat-topped Q dependence whereas the lower excitation energy below the longitudinal acoustic excitation shows Q-gap behaviour. From the viscosity estimated from the Q-gap experimentally obtained, it is inferred that the lower energy excitation arises from the transverse acoustic excitation in the liquids.

  • Longitudinal acoustic and higher-energy excitations in the liquid phase-change material Ge2Sb2Te5

    Inui M., Kajihara Y., Hosokawa S., Chiba A., Nakajima Y., Matsuda K., Tsuchiya Y., Stellhorn J.R., Hagiya T., Uchiyama H., Tsutsui S., Baron A.Q.R.

    Physical Review B (Physical Review B)  104 ( 6 )  2021.08

    ISSN  24699950

     View Summary

    The dynamic structure factor S(Q,E) of liquid Ge2Sb2Te5 has been obtained by inelastic x-ray scattering, where Q and E are momentum and energy transfer, respectively. The dispersion curve of the longitudinal acoustic excitation energy exhibits flat-topped Q dependence similarly to that in liquid GeTe and liquid Bi, where the local structure is modulated by Peierls distortion. The flat-topped energy in liquid Ge2Sb2Te5 is split into low and high energy parts arising from Sb-Te and Ge-Te correlations, respectively. Furthermore, the high energy part depends on Q like an optical mode with decreasing Q to zero, and it approaches the vibrational energy of fourfold coordinated Ge atoms with octahedral configurations. The result indicates that a majority of Ge in the liquid stays in octahedral order as predicted by first-principles molecular dynamics simulations.

  • Selective molecular absorption from low molecular weight mixed solution to a polymer p4mp1 film

    Chiba A., Akiyama R.

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu (Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu)  31 ( 2 ) 82 - 89 2021

    ISSN  0917639X

     View Summary

    Recently isotactic poly(4-methyl-1-pentene) (P4MP1) has been found to selectively absorb long-chain alkanes from alkane mixed systems. In this article, we introduce the idea of this study from the pressure-temperature phase diagram. We also show that such selective absorption characteristics can be explained from a simple model, namely Asakura-Oosawa theory, and the relationship with molecular recognition is explained.

  • Streak Patterns Observed in Small Angle X-Ray Scattering from Highly Oriented Pyrolytic Graphite (HOPG)

    Ohmasa Y., Chiba A.

    Zeitschrift fur Physikalische Chemie (Zeitschrift fur Physikalische Chemie)  235 ( 1-2 ) 37 - 57 2020

    ISSN  09429352

     View Summary

    © 2020 Walter de Gruyter GmbH, Berlin/Boston. Various forms of streak patterns are observed in small angle X-ray scattering from Highly Oriented Pyrolytic Graphite (HOPG). The streak patterns are assigned as specular reflection, double Bragg scattering, and diffuse + Bragg double scattering. These scatterings contain various information on the mesoscopic structures of the HOPG sample.

  • Confined Space Enables Spontaneous Liquid Separation by Molecular Size: Selective Absorption of Alkanes into a Polyolefin Cast Film

    Ayano Chiba, Akio Oshima,and Ryo Akiyama

    Langmuir (ACS Publications)  35 ( 52 ) 17177 - 17184 2019.11

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  0743-7463

     View Summary

    © 2019 American Chemical Society. The depletion force has been used to explain phase separation phenomena in colloidal systems. Here, we showed that depletion force can explain not only phase separation of large and small colloidal particles but also preferential absorption of larger molecules from a mixture of large and small molecules in a liquid state. When a polyolefin cast film was immersed in a mixture of long and short normal alkanes, the longer molecules were selectively absorbed into the film. This experimental result was explained from the viewpoint of depletion force. The main finding was the use of confined space to emphasize the separation tendency caused by the force. In general, the increase in entropy may serve as a driving force to mix molecules. However, if sufficiently narrow pores are present, large and small molecules are separated naturally by size as the entropy increases. This finding will lead to size exclusion chromatography of low-mass molecules, similar to gel permeation chromatography of macromolecules. In order to demonstrate the effect of depletion force, we selected and experimented with a system based on a polyolefin isotactic poly(4-methyl-1-pentene) (P4MP1) film and a normal alkane mixture and realized high molecular selectivity. The P4MP1 film we used can be prepared simply by evaporating the solvent from the solution and casting the film. On the basis of the Asakura-Oosawa theory, we concluded that spontaneous and high molecular selectivity is attributed to the depletion force provided by the small sub-nanopores with uniform size in the film.

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Papers, etc., Registered in KOARA 【 Display / hide

Presentations 【 Display / hide

  • Preferential absorption of longer alkanes for Isotactic Poly(4-methyl-1-pentene) Film

    Ayano Chiba

    Polysolvat-14 (Institut Charles Sadron, Strasbourg) , 

    2022.09

    Oral presentation (invited, special)

  • Infrared Measurements and X-Ray and Neutron Scattering Studies of the Alkane Absorption of the Isotactic Poly(4-methyl-1-pentene) Film

    Hiromi Murashige, Yusuke Hiejima, Yusuke Sanada, Yukiteru Katsumoto, Ayano Chiba

    Polysolvat-14 (Institut Charles Sadron, Strasbourg) , 

    2022.09

    Poster presentation

  • X-ray and neutron diffraction of semi-crystalline isotactic poly (4-methyl-1-pentene) with alkane absorption

    Ayano Chiba

    The 18th International Conference on Liquid and Amorphous Metals (LAM-18), 

    2022.09

    Oral presentation (general)

  • ポリ(4-メチル-1-ペンテン)膜の溶媒吸蔵に伴う構造変化の赤外分光・X 線回折 による測定

    村重博美、千葉文野

    Mini-Symposium on Liquids 2022 (MSL2022) (九州大学伊都キャンパス) , 

    2022.07

    Poster presentation

  • SWCNT 周辺における混合アルカン溶媒の凝集状態に関する研究

    伊藤大基、千葉文野

    Mini-Symposium on Liquids 2022 (MSL2022), 

    2022.07

    Poster presentation

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • 高分子フィルムに対する有機溶媒の優先透過および吸蔵現象

    2022.04
    -
    2025.03

    日本学術振興会, 科学研究費助成事業(科学研究費補助金), 基盤研究(C), Research grant, Principal investigator

  • 高分子のホストゲスト共結晶構造・共アモルファス構造の探索

    2021.09
    -
    2023.03

    日本学術振興会, 科学研究費助成事業, Ayano Chiba, 学術変革領域研究(A)公募研究, Research grant, Principal investigator

  • エントロピー駆動液体分離

    2020.04
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    2023.03

    公益財団法人 旭硝子財団, 若手継続グラント, Research grant, Principal investigator

  • Development and understanding of a new liquid separation method using pores in polymer crystals

    2019.11
    -
    2020.11

    The Sumitomo Foundation, Grant for Basic Science Research Projects, Research grant, Principal investigator

  • エントロピー駆動の物質分離法:結晶空隙を用いた低分子サイズ排除クロマトグラフィー

    2019.04
    -
    2022.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

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Works 【 Display / hide

  • 他大学セミナー講演

    千葉 文野

    愛媛大学理学部本館3階S31教室, 

    2015.12

    Other, Single

     View Details

    溶融高分子の圧力誘起構造変化: SiO2ガラスとの共通点を中心に

  • 他大学セミナー講演

    CHIBA AYANO

    首都大学東京 8号館302号室, 

    2013.11

    Other, Single

  • 他大学 一般公開講演

    CHIBA AYANO

    2013.10

    Other, Single

  • 他大学コロキウム講演

    CHIBA AYANO

    九州大学 箱崎キャンパス 物理 第3講義室, 

    2013.01

    Other, Single

  • TV出演

    CHIBA AYANO

    2012.12

    Other, Single

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Intellectual Property Rights, etc. 【 Display / hide

  • ポリオレフィン系重合体並びにそれを用いた有機化合物の吸着、吸蔵及び分離

    Date applied: 特願2020-56735  2020.03 

    Patent, Single

  • ポリオレフィン系重合体並びにそれを用いた有機化合物の吸着、吸蔵及び分離

    Date applied: 特願2019-67703  2019.03 

    Patent, Single

Awards 【 Display / hide

  • SCIENCE GRANT SHISEIDO FEMALE RESEARCHER

    2018.07, 株式会社 資生堂, 第11回資生堂 女性研究者サイエンスグラント

    Type of Award: Other

 

Courses Taught 【 Display / hide

  • VIBRATIONS AND WAVES

    2022

  • PHYSICS SEMINAR 2

    2022

  • PHYSICS LABORATORIES 2

    2022

  • PHYSICS LABORATORIES 1

    2022

  • LITERATURE OF PHYSICS

    2022

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Social Activities 【 Display / hide

  • Photon Factory News (PFニュース)編集委員会

    2012.04
    -
    2014.03
  • 新学術領域研究専門委員会(2002_中性子地球科学)

    2009.12
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    2011.03

Memberships in Academic Societies 【 Display / hide

  • 日本化学会, 

    2013.04
    -
    Present
  • 日本高圧力学会, 

    2005.11
    -
    Present
  • 高分子学会, 

    2003.12
    -
    2005.11
  • 日本放射光学会, 

    2003.10
    -
    Present
  • 日本化学会, 

    2003.10
    -
    2004.09

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Committee Experiences 【 Display / hide

  • 2020.04
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    2023.03

    日本物理学会 会誌編集委員, 日本物理学会

  • 2019.11
    -
    Present

    中性子課題審査部会/P1利用研究課題審査委員, J-PARCセンター

  • 2018.09
    -
    2020.08

    評議員、渉外幹事, 日本高圧力学会

  • 2014.04
    -
    2015.03

    領域12 運営委員(化学物理), 日本物理学会

  • 2013.04
    -
    Present

    Member, 日本化学会

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