Details of a Researcher

Chiba, Ayano

写真a

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

Position: Assistant Professor/Senior Assistant Professor

Related Websites

http://www.phys.keio.ac.jp/faculty/ayano/ayano.html

External Links

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Career 【 Display / hide 】

2003.04

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2003.11

Kyoto university, Department of physics, JSPS Fellow
2003.12

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2005.08

Kyoto university, Department of engineerig, JSPS Fellow
2005.09

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2007.03

Keio university, Instructor
2007.02

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2008.03

Rutherford Appleton Laboratory, Visiting Scientist
2007.04

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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

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Academic Degrees 【 Display / hide 】

PhD, Kyoto University, Coursework, 2003.11

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Research Areas 【 Display / hide 】

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

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Research Keywords 【 Display / hide 】

Liquids
Polymer
Disordered Systems
Molecular absorption
Phase Transition

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Books 【 Display / hide 】

Hyperordered Structures in Materials -- Disorder in Order and Order within Disorder

Springer, 2023.10, Page： 456

Scope: Section 6 "Dynamics", Contact page： pp. 139-158 , Accepted
- Access to Document (DOI)

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Papers 【 Display / hide 】

In Situ X-Ray and Infrared Measurements of Alkane Absorption and Desorption Processes of Isotactic Poly(4-Methyl-1-Pentene) Film

Hiromi Murashige, Yusuke Hiejima, Yusuke Sanada, Ayano Chiba

Macromolecular Symposia （Macromolecular Symposia) 408 （ 1 ） 2200090-1 - 2200090-5 2023.04

Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted, ISSN 10221360

　View Summary

Small molecules are absorbed selectively in the amorphous regions in semicrystalline polymers, except for some specific polymeric systems forming host-guest cocrystals such as syndiotactic polystyrene. The crystalline density of isotactic poly(4-methyl-1-pentene) (P4MP1) is substantially lower than those of analogs, and it is even slightly lower than the amorphous density. This study is investigated the absorption/desorption behaviors of short alkanes in P4MP1 in situ, and found that the alkanes are mainly absorbed in its amorphous region. Infrared spectroscopy measurements reveal that the P4MP1 film with low crystallinity absorbs higher amount of decane than the high crystallinity film does. Also it is found by small-angle X-ray scattering (SAXS) that, when hexane is dropped onto the P4MP1 as-cast film, a lamellar long-spacing peak appears at 0.16 nm−1 which disappears with the spontaneous desorption of hexane. Because the pristine P4MP1 films give no obvious SAXS peak due to the close density of crystalline and amorphous regions, the appearance of the SAXS peak indicates that an X-ray contrast is obtained by the preferential absorption to amorphous region. The disappearance of the peak is thus reasonably understood by the loss of the contrast due to desorption.
- Access to Document (DOI)
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.
- Access to Document (DOI)
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 2021.10

Accepted, 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.
- Access to Document (DOI)
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.
- Access to Document (DOI)
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.
- Access to Document (DOI)

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

Development of entropy-driven liquid separation method

Chiba, Ayano

学事振興資金研究成果実績報告書（慶應義塾大学) 2019
Absorption of molecules into interstitial space of polymer crystals driven by entropic force

Chiba, Ayano

科学研究費補助金研究成果報告書 2018
Search of pressure-induced liquid-liquid transitions in polymers

Chiba, Ayano

科学研究費補助金研究成果報告書 2015
Small- and wide-angle scattering measurement of suppression of Peielrs distortion in liquids

Chiba, Ayano

科学研究費補助金研究成果報告書 2010

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Reviews, Commentaries, etc. 【 Display / hide 】

高分子P4MP1フィルムの長鎖アルカン優先的吸蔵現象

千葉文野

有機結晶部会ニュースレター 53 7 - 8 2022.12

Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Last author, Corresponding author

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Presentations 【 Display / hide 】

Change in Lamellar Structure of P4MP1 Films due to Solvent Absorption

Hiromi Murashige, Yusuke Hiejima, Ayano Chiba

International conference on complex orders in condensed matter: aperiodic order, local order, electronic order, hidden order (VVF Les rives du lac, Evian, France) ,

2023.09
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Oral presentation (general)
Small Angle Neutron Scattering Reveals Length Selectivity of Alkanes Absorbed in P4MP1 Films

Hirhomi Murashige, Ayano Chiba, Rintaro Inoue, Ken Morishima, Yusuke Hiejima

The 7th International Soft Matter Conference (ISMC2023) (Osaka International Convention Center, Osaka, Japan) ,

2023.09
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Poster presentation
Alkane Absorption into Polymer P4MP1 and Carbon Nanotubes measured by Neutron Diffraction

Ayano Chiba

Mini-Symposium on Liquids (MSL2023) (The 50th Anniversary Hall, Okawaya Univ., Tshushima-naka 1-1-1 Okayama 700-8530) ,

2023.06
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Poster presentation
Observation of the Length Selective Alkane Absorption in P4MP1 Films in the Small-Angle Scattering Region

Hiromi Murashige, Ayano Chiba

788. WE-Heraeus-Seminar, "Beyond Imperfections: New Structure-Property Relationships in Ceramics and Glasses" (Physikzentrum Bad Honnef, Hauptstraße 5, 53604 Bad Honnef) ,

2023.05
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Oral presentation (general)
小角X線散乱で評価する高分子P4MP1膜の溶媒吸蔵と結晶化度の変化

村重博美、比江嶋祐介、千葉文野

第40回高分子学会千葉地域活動若手セミナー (東京理科大学　野田キャンパス　７号館６階　（千葉県野田市山崎2641）) ,

2023.03
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Poster presentation, 高分子学会関東支部　千葉地域活動若手会

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

液相分離と気相分離：ナノ細孔による選択的分子吸着の研究

2023.04

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2026.03

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, Coinvestigator(s)
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

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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

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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

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2020.11

The Sumitomo Foundation, Grant for Basic Science Research Projects, Research grant, 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
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Other, Single

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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
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Other, Single
他大学一般公開講演

CHIBA AYANO

2013.10
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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
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Other, Single
TV出演

CHIBA AYANO

2012.12
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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