Updated on 2023/04/04

写真a

 
OKITA Erika
 
Organization
Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology Assistant Professor
School of Engineering Department of Chemical Engineering
Title
Assistant Professor
Affiliation
Institute of Engineering

Position

  • Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology 

    Assistant Professor  2022.04 - Now

  • School of Engineering Department of Chemical Engineering 

    Assistant Professor  2022.04 - Now

Degree

  • 博士(工学) ( Doshisha University )

  • 修士(工学) ( Doshisha University )

  • 学士(工学) ( Doshisha University )

Research Areas

  • Natural Science / Biophysics, chemical physics and soft matter physics

  • Nanotechnology/Materials / Nano/micro-systems

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Biofunction and bioprocess engineering

  • Natural Science / Biophysics, chemical physics and soft matter physics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Biofunction and bioprocess engineering  / Non-equilibrium science

  • Nanotechnology/Materials / Nano/micro-systems

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Research Interests

  • Non-equilibrium science

  • autonomous motion

  • vesicle

  • ソフトマター

  • コロイド

  • アクティブマター

Research subject summary

  • 自律運動をおこなうアクティブソフトマター

Research Career

  • ミクロスケールの化学ポテンシャル勾配を利用して駆動する両親媒性分子集合体

    Individual

    2019.04 - 2022.03 

Professional Memberships

  • 紛体工学会

    2016.06 - Now   Domestic

  • 日本化学会

    2015.12 - Now   Domestic

  • 化学工学会

    2012.05 - Now   Domestic

  • THE SOCIETY OF POWDER TECHNOLOGY, JAPAN

  • THE CHEMICAL SOCIETY OF JAPAN

  • THE SOCIETY OF CHEMICAL ENGINEERS, JAPAN

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Awards

  • ポスター賞金賞

    2015.03   化学工学会第80年会  

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    Country:Japan

  • ポスター賞

    2014.12   第24回非線形反応と協同現象研究会  

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    Country:Japan

Job Career (off-campus)

  • 大阪公立大学   大学院工学研究科

    2022.04 - Now

  • Osaka Prefecture University   Graduate School of Engineering

    2020.04 - 2022.03

  • Doshisha University   Office for Research Initiatives and Development

    2017.04 - 2020.03

Papers

  • Detection of Inhomogeneity After Mixing Solutions by Analyzing the Chemical Wave Pattern in the Belousov-Zhabotinsky Reaction Reviewed

    Yasunao Okamoto, Erika Okita, Daigo Yamamoto, Satoshi Nakata, Akihisa Shioi

    Frontiers in Physics   10 ( 895824 )   2022.05

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    Publishing type:Research paper (scientific journal)  

    The correlation between BZ reaction and mixing state has been studied for decades, and the researchers are trying to apply it to chemical engineering. We observed a chemical wave pattern in the Belouzov-Zhabotinsky (BZ) reaction based on the inhomogeneity after mixing BZ and ferroin solutions with a mixing method named the rotation-and-stop method. A one-dimensional chemical wave appeared for large inhomogeneity in mixing. The frequency and wavenumber decreased with decreasing degree of inhomogeneity. In an almost perfectly mixed state, the wavenumber significantly reduced and approached the global oscillation. The degree of mixing could be efficiently determined by this reported method. Perfect mixing has never been realized in natural and biological systems. The results of this study can be applied to estimate the degree of mixing in a solution that is not being stirred after the mixing process.

    DOI: 10.3389/fphy.2022.895824

  • Mode Bifurcation on Contact Line Dynamics at Oil/Water Interface Depending on the Contact Line Length Reviewed

    Daigo Yamamoto, Jumpei Maeno, Yuki Manabe, Yasunao Okamoto, Erika Nawa-Okita, Akihisa Shioi

    Frontiers in Chemistry   9   2021.07

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    Publishing type:Research paper (scientific journal)  

    The motion of the contact line at the oil/water interface caused by chemical reactions is well known as a typical example of artificial active matter in the field of nonlinear science. When water (containing trimethylstearylammonium chloride) and nitrobenzene (containing iodide anion) phases are in contact, the regulated traveling-wave patterns appear along the inner wall of the glass container. In this study, we demonstrate a new dynamical mode of the contact line, an up-and-down motion, which becomes dominant with the decrease in the size of a glass tube, and the probability of occurrence is extremely high when the diameter of the glass tube is below 1 mm. A physicochemical model of the contact line motion that incorporates the spatiotemporal variation of the surfactant concentration on a glass surface is proposed, and its effect on the wettability of oil/water phases on the walls of the glass tubes is studied. The present model can reproduce the mode bifurcation of the dynamical motion depending on the inner diameter of the glass tubes.

    DOI: 10.3389/fchem.2021.708633

  • Energy Flux on a Micromotor Operating under Stationary Direct Current Voltage Reviewed

    Wenyu Zhang, Kohei Ohara, Yasunao Okamoto, Erika Nawa-Okita, Daigo Yamamoto, Akihisa Shioi

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   627   127197 - 127197   2021.07( ISSN:0927-7757

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.colsurfa.2021.127197

  • Horizontal spin of ratchet motor by vertical agitation Reviewed

    Toshinobu Takahashi, Erika Okita, Daigo Yamamoto, Yasunao Okamoto, Akihisa Shioi

    Scientific Reports   11 ( 11983 )   2021.06

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    Publishing type:Research paper (scientific journal)  

    <title>Abstract</title>The horizontal spin of a ratchet motor by vertical vibration is reported. A macroscopic ratchet gear is placed on a granular bed, where nearly half of the gear is penetrated in the bed. The gear and granular bed are mechanically vibrated. The gear shows a random motion or one-way spin that depend on the diameter of the granules, vibration frequency, and degree of vertical motion allowed for the gear. Even when one-way spin is observed, the spin direction depends on the abovementioned factors. Although the dependency is complicated, it is deterministic because the motion or flows of granular matter determines it. The characteristics observed in the experiments are explained by a simple model that accounts for the statistical variance in the motion of the granular matter. Extraction of systematic motion from small and non-useful motions such as mechanical agitation will be developed into energy harvest technology and may facilitate the science of a spontaneously moving system in a uniform potential field.

    DOI: 10.1038/s41598-021-91319-8

    Other URL: http://www.nature.com/articles/s41598-021-91319-8

  • Ageing Model of Rubber O-Rings Used in Gas-Insulated Substation Equipment Reviewed

    Tadao Minagawa, Yasumichi Hatanaka, Yosuke Oyanagi, Erika Okita, Masahiro Yasuda

    KAGAKU KOGAKU RONBUNSHU   47 ( 3 )   69 - 75   2021.05( ISSN:0386-216X

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1252/kakoronbunshu.47.69

  • Synchronization of chemo-mechanical oscillators Reviewed

    Masahiro Kasai, Daigo Yamamoto, Erika Nawa-Okita, Akihisa Shioi

    AIP Advances   10 ( 6 )   065007 - 065007   2020.06

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    Publishing type:Research paper (scientific journal)  

    © 2020 Author(s). The synchronization of chemically driven oscillators plays a crucial role in various biological motions. An artificial model system of these chemo-mechanical oscillators is proposed in this study. The oscillator is composed of three liquid layers (oil/water/oil), which exhibit a back and forth motion in a glass tube. This motion is caused by the chemical reaction between a water-soluble surfactant and oil-soluble anions. The frequency is unique for an individual experimental setup because it depends on the surface state of the glass sensitively. When the glass tube with the liquid oscillator is placed on a plate with mechanical vibration, the frequencies of the oscillator and mechanical vibration become similar within a certain frequency range of mechanical vibration. When two or more glass tubes are placed in a boat floating on a water surface, all frequencies agree with each other by the joggling motion of the boat. The entrainment into the external vibration and mutual synchronization on the boat are explained by a simple mathematical model. The proposed chemo-mechanical oscillator may be used as a primitive model system for studying the interplay of macroscopic motion and molecular scale processes that control chemically driven motion.

    DOI: 10.1063/5.0006387

  • A Molecular Assembly Machine Working under a Quasi-Steady State pH Gradient Reviewed

    Erika Nawa-Okita, Yuki Nakao, Daigo Yamamoto, Akihisa Shioi

    Bulletin of the Chemical Society of Japan   93 ( 4 )   604 - 610   2020.04( ISSN:0009-2673

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)  

    © 2020 The Chemical Society of Japan. Biological functions are maintained by various types of molecular motors driven at several pico-newtons, where the driving force is obtained from a chemical potential difference within the microscale. Here, we show in detail artificial vesicles that generate mechanical work from a local pH gradient. This study demonstrates that they can be regarded as a molecular assembly machine. We have previously reported that the vesicles are composed of oleate and oleic acid and exhibit rhythmic shape changes. This cyclic motion involves both rotation of the entire vesicle and its inside-out inversion, which constitute relaxation and excitation processes, respectively, that sustain the cycle. These motions were observed under a quasi-steady state pH gradient, and the driving force of rotation was determined to be of the order of 10-210-1 pN, which is consistent with the membrane elasticity driving the deformation (vesicle inversion).

    DOI: 10.1246/bcsj.20190348

  • The Behavior of BZ Reaction in Small Space with Liquid Marble Reviewed

    Yasunao Okamoto, Jun’ya Tanoue, Erika Nawa-Okita, Daigo Yamamoto, Syuji Fujii, Taisuke Maki, Kazuhiro Mae, Akihisa Shioi

    Journal of the Society of Powder Technology, Japan   57 ( 2 )   74 - 79   2020.02( ISSN:0386-6157

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    Publishing type:Research paper (scientific journal)  

    © 2020 Society of Powder Technology. All rights reserved. Belousov-Zhabotinsky (BZ) reaction is a typical example of chemical oscillation. For an application of BZ reaction to engineering, the downsizing of reaction field will be needed. We focus on liquid marble (LM) to solve this subject. LM is a stable sphere liquid covered with hydrophobic microparticles. We observed BZ reaction in LM to investigate the reaction property in small space. We succeeded in observing chemical oscillation for a long time in LM. During the observation, no bubble was produced although carbon dioxide is contained as reaction products. We found that LM tends to exhibit regular oscillation mode with a decrease in droplet size. In addition, the period of BZ reaction changes with the size. This can be explained from the effect of oxygen and the amount of particles covering a droplet. As a result, the oscillation period can be controlled by the droplet size and the amount of particles.

    DOI: 10.4164/sptj.57.74

  • Ionic Tuning of Droplet Motion on Water Surface Reviewed

    Yudai Mikuchi, Hirofumi Yamashita, Daigo Yamamoto, Erika Nawa-Okita, Akihisa Shioi

    Frontiers in Chemistry   7   788 - 788   2019.11

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    Herein, the oscillation of an oil droplet on the surface of water is studied. The droplet contains an anionic surfactant that can react with the cations present in water. The oscillation starts after a random motion, and the oscillation pattern apparently depends on the cation species in the water phase. However, a common pattern is included. The cation species only affects the amplitude and frequency and sometimes perturbs the regular pattern owing to the instability at the oil/water interface. This common pattern is explained by a simple model that incorporates the surfactant transport from the droplet to the surrounding water surface. The dependency of the amplitude and frequency on cation species is expressed quantitatively by a single parameter, the product of the amplitude and square of frequency. This parameter depends on the cationic species and can be understood in terms of the spreading coefficient. The simple model successfully explains this dependency.

    DOI: 10.3389/fchem.2019.00788

    PubMed

  • Autonomous Movement System Induced by Synergy between pH Oscillation and a pH-Responsive Oil Droplet Reviewed

    Okamoto Yasunao, Sasaki Yoko, Nawa-Okita Erika, Yamamoto Daigo, Shioi Akihisa

    LANGMUIR   35 ( 44 )   14266 - 14271   2019.11( ISSN:0743-7463

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    Publishing type:Research paper (scientific journal)  

    © 2019 American Chemical Society. A sustainable droplet motion that is driven by pH oscillation was obtained. The pH oscillation is only of a single pulse in a batch reactor. However, it shows continuous oscillation around the moving droplet, as the motion itself controls the diffusion flux in an asymmetric manner. Various types of motions that are spontaneous in nature may be obtained by a single-pulse oscillation coupled with mass transport.

    DOI: 10.1021/acs.langmuir.9b02072

    PubMed

  • Dynthesis og Gold Nanoparticles with Liesegang Phenomenon Invited Reviewed

    Kento Obayashi, Riho Kayama, Miwako Toda, Erika Okita(Nawa, Daigo Yamamoto, Akihisa Shioi

    JOURNAL OF the Society of Powder Technology   56 ( 4 )   187 - 193   2019.04( ISSN:0386-6157

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    Publishing type:Research paper (scientific journal)  

    © 2019 Society of Powder Technology. All rights reserved. Liesegang phenomenon has been extensively studied experimentally and theoretically in the field of nonlinear science. However, there are few studies for its applications due to the high nonlinearity. The particles produced with the Liesegang phenomenon have been limited to microparticles of sparingly soluble salt for many years. In this study, in anticipation of more engineering application of this phenomenon, gold nanoparticles are synthesized by diffusing gold ions into a gel containing a reductant. At that time, we investigate the influence of diffusion conditions on particle formation. As a result, we found that the size of resultant particles depends on the gel position. Furthermore, we construct mathematical model expressing ion diffusion and particle growth based on Ostwald ripening to discuss the particle formation mechanism.

    DOI: 10.4164/sptj.56.187

  • Self-Organized Micro-Spiral of Single-Walled Carbon Nanotubes Reviewed

    Keisuke Mae, Hidetoshi Toyama, Erika Nawa-Okita, Daigo Yamamoto, Yong-Jun Chen, Kenichi Yoshikawa, Fumiyuki Toshimitsu, Naotoshi Nakashima, Kazunari Matsuda, Akihisa Shioi

    Scientific Reports 雑誌 Nature research   7   2017.07

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    Kind of work:Joint Work  

  • Self-Propelled Vesicles Induced by the Mixing of Two Polymeric Aqueous Solutions through a Vesicle Membrane Far from Equilibrium Reviewed

    Takahiko Ban, Takashi Fukuyama, Shouta Makino, Erika Nawa, Yuichiro Nagatsu

    Langmuir 雑誌 ACS Publications   32 ( 11 )   2574 - 2581   2016.03

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    Kind of work:Joint Work  

  • pH変化感知性の自律運動を示すオレイン酸系ベシクルに関する研究 Reviewed

    名和愛利香

    同志社大学学位論文   2016.03

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    Kind of work:Single Work  

  • Reversible transformation of an acid/soap vesicle by glucose oxidation Reviewed

    Erika Nawa, Daichi Sakashita, Kentaro Owaki, Daigo Yamamoto, Akihisa Shioi

    Colloid and Interface Science Communications 雑誌 Elsevier   8   10 - 13   2016.01

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    Kind of work:Joint Work  

  • Chemotactic Amoeboid-Like Shape Change of a Vesicle under a pH Gradient Reviewed

    Erika Nawa, Daigo Yamamoto, Akihisa Shioi

    Bulletin of the Chemical Society of Japan 雑誌 日本化学会   88 ( 11 )   1536 - 1544   2015.11

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    Kind of work:Joint Work  

  • Rhythmic shape change of a vesicle under a pH gradient Reviewed

    Erika Nawa, Yasuyoshi Nishigaki, Daigo Yamamoto, Akihisa Shioi

    Soft Matter 雑誌 The Royal Society of Chemistry   9 ( 32 )   7832 - 7842   2013.06

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    Kind of work:Joint Work  

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Books and Other Publications

  • WSPC Book Series in Unconventional Computing: Vol. 2 | Unconventional Computing, Arts, Philosophy

    ( Role: Joint author ,  Chap.31 (pp. 501-509)Designing Microchemical Systems Like Living Matters Induced by Interfacial Phenomena)

    2022.10  ( ISBN:9789811257148

  • 撹拌技術とスケールアップ、シミュレーションの活用

    技術情報協会( Role: Contributor ,  第2章 第17節 懸濁重合,乳化重合の連続プロセスと高分子微粒子の作製)

    技術情報協会  2021.11  ( ISBN:9784861048647

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    Total pages:532p  

    CiNii Books

  • Chemoresponsive Materials: Stimulation by Chemical and Biological Signals

    Daigo Yamamoto, Erika Nawa, Akihisa Shioi( Role: Joint author)

    The Royal Society of Chemistry (RSC Publishing)  2015.07 

MISC

  • 粉体層の物理振動による物体の指向的運動や自己組織化

    名和愛利香

    ホソカワ粉体工学振興財団年報   27   2020.05

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Presentations

  • Biomimetic motions of acid/soap vesicles under pH gradients Invited

    Erika OKITA

    Pacifichem 2021  2021.12 

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    Presentation type:Oral presentation (invited, special)  

  • 非線形同期を利用した吸脱着過程と巨視的運動状態の相互作用に関する研究 Domestic conference

    塩井章久, 笠井柾宏, 山本大吾, 沖田愛利香, 岡本泰直

    化学工学会 第86年会  2021.03 

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    Presentation type:Poster presentation  

  • pH勾配を感知して自律運動をおこなうオレイン酸系ベシクルの運動メカニズム Invited Domestic conference

    沖田愛利香

    第19回反好会講演会   2020.09 

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    Presentation type:Oral presentation (invited, special)  

  • Driving force of vesicle with autonomous motion under a quasi-steady state pH gradient International conference

    Erika Nawa, Yuki Nakao, Daigo Yamamoto, Akihisa Shioi

    OKINAWA COLLOIDS 2019  2019.11 

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    Presentation type:Oral presentation (general)  

  • Acid/soap vesicle working under a quasi-steady state pH gradient International conference

    Erika Nawa, Yuki Nakao, Daigo Yamamoto, Akihisa Shioi

    18th Asian Pacific Confederation of Chemical Engineering Congress (APCChE 2019)  2019.09 

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    Presentation type:Oral presentation (general)  

  • 粉体層の加振を利用して指向的運動をおこなう歯車 Invited

    名和愛利香

    APPIE第69回若手のつどい  2019.08 

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    Presentation type:Oral presentation (invited, special)  

  • 自己組織化した分子集合体の指向的運動によるエネルギー変換 Domestic conference

    名和愛利香, 中尾友紀, 山本大吾, 塩井章久

    粉体工学会2019年度春期研究発表会  2019.05 

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    Presentation type:Oral presentation (general)  

  • 非線形同期を利用した吸脱着過程と巨視的運動状態の相互作用に関する研究

    塩井章久, 笠井柾宏, 山本大吾, 沖田愛利香, 岡本泰直

    化学工学会 第86年会 

  • pH勾配を感知して自律運動をおこなうオレイン酸系ベシクルの運動メカニズム

    沖田愛利香

    第19回反好会講演会 

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Outline of collaborative research (seeds)

  • ベシクルを用いたアクティブソフトマター

Charge of on-campus class subject

  • Laboratory: Chemical Engineering II

    2021   Practical Training  

  • Laboratory Chemistry

    2021   Practical Training  

Charge of off-campus class subject

  • 化学工学実験

    Institution:Osaka Prefecture University

  • 化学実験

    Institution:Osaka Prefecture University

  • 化学システム工学実験

    Institution:Doshisha University