N.J.Suematsu

1. Brigitta Dúzs, Gábor Holló, Hiroyuki Kitahata, Elliott Ginder, Nobuhiko J. Suematsu, István Lagzi & István Szalai
   Appearance and suppression of Turing patterns under a periodically forced feed
   Commun. Chem. 6, 3 (2023).
   Publication date: January 03, 2023.
   DOI: https://doi.org/10.1038/s42004-022-00800-6

   Abstract

   Turing instability is a general and straightforward mechanism of pattern formation in reaction–diffusion systems, and its relevance has been demonstrated in different biological phenomena. Still, there are many open questions, especially on the robustness of the Turing mechanism. Robust patterns must survive some variation in the environmental conditions. Experiments on pattern formation using chemical systems have shown many reaction–diffusion patterns and serve as relatively simple test tools to study general aspects of these phenomena. Here, we present a study of sinusoidal variation of the input feed concentrations on chemical Turing patterns. Our experimental, numerical and theoretical analysis demonstrates that patterns may appear even at significant amplitude variation of the input feed concentrations. Furthermore, using time-dependent feeding opens a way to control pattern formation. The patterns settled at constant feed may disappear, or new patterns may appear from a homogeneous steady state due to the periodic forcing.

   

2. Tadayoshi Aoyama, Shoki Yamada, Nobuhiko J. Suematsu, Masaru Takeuchi, and Yasuhisa Hasegawa
   Visual Sensing System to Investigate Self-Propelled Motion and Internal Color of Multiple Aqueous Droplets
   Sensors 22, 6309 (2022).
   Publication date: August 22, 2022.
   DOI: https://doi.org/10.3390/s22166309

   Abstract

   This study proposes a visual sensing system to investigate the self-propelled motions of droplets. In the visual sensing of self-propelled droplets, large field-of-view and high-resolution images are both required to investigate the behaviors of multiple droplets as well as chemical reactions in the droplets. Therefore, we developed a view-expansive microscope system using a color camera head to investigate these chemical reactions; in the system, we implemented an image processing algorithm to detect the behaviors of droplets over a large field of view. We conducted motion tracking and color identification experiments on the self-propelled droplets to verify the effectiveness of the proposed system. The experimental results demonstrate that the proposed system is able to detect the location and color of each self-propelled droplet in a large-area image.

   

3. Nobuhiko J. Suematsu and Satoshi Nakata
   Instability of the Homogeneous Distribution of Chemical Waves in the Belousov–Zhabotinsky Reaction
   Materials 14, 6177 (2021).
   Publication date: August 7, 2021.
   DOI: https://doi.org/10.3390/ma14206177

   Abstract

   Chemical traveling waves play an important role in biological functions, such as the propagation of action potential and signal transduction in the nervous system. Such chemical waves are also observed in inanimate systems and are used to clarify their fundamental properties. In this study, chemical waves were generated with equivalent spacing on an excitable medium of the Belousov–Zhabotinsky reaction. The homogeneous distribution of the waves was unstable and low- and high-density regions were observed. In order to understand the fundamental mechanism of the observations, numerical calculations were performed using a mathematical model, the modified Oregonator model, including photosensitive terms. However, the homogeneous distribution of the traveling waves was stable over time in the numerical results. These results indicate that further modification of the model is required to reproduce our experimental observations and to discover the fundamental mechanism for the destabilization of the homogeneous-distributed chemical traveling waves.

   

4. Nobuhiko J. Suematsu, Junpei Iwamoto, Yuya Ishii, and Akira Yamamoto
   Dendrite Pattern Formation of Sodium Chloride Crystal
   Materials 14, 4434 (2021).
   Publication date: August 7, 2021.
   DOI: https://doi.org/10.3390/ma14164434

   Abstract

   A variety of crystal structures is found in nature, not only equilibrium structures reflecting molecular structures, but also non-equilibrium structures which depend on the physicochemical conditions occurring during the crystal growth. In this paper, we focus on the dendrite structure of sodium chloride (NaCl) formed by the simple evaporation of an aqueous NaCl solution. The characteristics of the growth structures were measured as a function of the initial concentration of NaCl. In addition, the crystal growth process was measured using optical microscopy. As a result, the growth rate was not constant but was found to oscillate over time and synchronize with the wetting of the crystal. Our observations indicate that dendrite structures are more easily generated at higher initial concentrations. The detailed mechanism for dendrite pattern formation is still under investigation.

   

5. Nobuhiko J. Suematsu, Yoshihito Mori, Takashi Amemiya, and Satoshi Nakata
   Spontaneous Mode Switching of Self-Propelled Droplet Motion Induced by a Clock Reaction in the Belousov−Zhabotinsky Medium
   J. Phys. Chem. Lett. 12, 7526−7530 (2021).
   Publication date: August 4, 2021.
   DOI: https://doi.org/10.1021/acs.jpclett.1c02079

   Abstract

   Interfacial chemical dynamics on a droplet generate various self-propelled motions. For example, ballistic and random motions arise depending on the physicochemical conditions inside the droplet and its environment. In this study, we focus on the relationship between oxidant concentrations in an aqueous droplet and its mode of self-propelled motion in an oil phase including surfactant. We demonstrated that the chemical conditions inside self-propelled aqueous droplets were changed systematically, indicating that random motion appeared at higher concentrations of oxidants, which were H2SO4 and BrO3–, and ballistic motion at lower concentrations. In addition, spontaneous mode switching from ballistic to random motion was successfully demonstrated by adding malonic acid, wherein the initially observed reduced state of the aqueous solution suddenly changed to the oxidized state. Although we only observed one-time transition and have not yet succeeded to realize alternation between ballistic (reduced state) and random motion (oxidized state), such spontaneous transitions are fundamental steps in realizing artificial cells and understanding the fundamental mechanisms of life-like behavior, such as bacterial chemotaxis originating from periodical run-and-tumble motion.

   

6. Masakazu Kuze, Mari Horisaka, Nobuhiko J. Suematsu, Takashi Amemiya, Oliver Steinbock, and Satoshi Nakata
   Switching between Two Oscillatory States Depending on the Electrical Potential
   J. Phys. Chem. B 125, 3638−3643 (2021).
   Publication date: April 2, 2021.
   DOI: https://doi.org/10.1021/acs.jpcb.0c11019

   Abstract

   Various spatiotemporal patterns were created on the surface or in the body of cation-exchange resin beads which were loaded with the catalyst of the Belousov–Zhabotinsky (BZ) reaction. Either global oscillations (GO) or traveling waves (TW) and the switching between them were observed in the previous papers, but it was not clear how chemicals contribute to the reaction inside/around the BZ bead. In this paper, we scanned the electrical potential, E, from +1 to −1 V (negative scan) and then turned from −1 to +1 V (positive scan) to control the switching between GO and TW. We found that the electrical switching potential from TW to GO, E_TG, and from GO to TW, E_GT, depended on the scanning direction of E and the diameter of the bead, d. The present study suggests that the electrode-induced increase of the inhibitor, Br^–, and the activator, HBrO₂, around the BZ bead plays an important role in determining E_TG and E_GT.

   

7. Gábor Holló,Nobuhiko J. Suematsu, Elliott Ginder, and Istvan Lágzi
   Electric field assisted motion of a mercury droplet
   Scientific Reports 11, 2753 (2021).
   Publication date: February 2, 2021.
   DOI: https://doi.org/10.1038/s41598-020-80375-1

   Abstract

   Field-assisted self-assembly, motion, and manipulation of droplets have gained much attention in the past decades. We exhibit an electric field manipulation of the motion of a liquid metal (mercury) droplet submerged in a conductive liquid medium (a solution of sulfuric acid). A mercury droplet moves toward the cathode and its path selection is always given by the steepest descent of the local electric field potential. Utilizing this unique behavior, we present several examples of droplet motions, including maze solving, electro-levitation, and motion on a diverted path between parallel electrodes by controlling the conductivity of the medium. We also present an experimental demonstration of Fermat's principle in a non-optical system, namely a mercury droplet moving along a refracted path between electrodes in a domain having two different conductivities.

   

8. Takahiro Tanabe, Takuto Ogasawara, and Nobuhiko J. Suematsu
   Effect of a product on spontaneous droplet motion driven by a chemical reaction of surfactant
   Phys. Rev. E 102, 023102 (2020).
   Publication date: August 3, 2020.
   DOI: 10.1103/PhysRevE.102.023102

   Abstract

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9. Chao Zhou,Nobuhiko J. Suematsu, Yixin Peng, Qizhang Wang, Xi Chen, Yongxiang Gao, and Wei Wang
   Coordinating an Ensemble of Chemical Micromotors via Spontaneous Synchronization
   ACS Nano 14, 5360-5370 (2020).
   Publication date: April 9, 2020
   DOI: https://doi.org/10.1021/acsnano.9b08421

   Abstract

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10. Nobuhiko J. Suematsu, Kazumi Saikusa, and Shunsuke Izumi
    Interfacial Dynamics in the Spontaneous Motion of an Aqueous Droplet
    Langmuir 35, 11601 (2019).
    Publication date: August 9, 2019
    DOI: https://doi.org/10.1021/acs.langmuir.9b01866

    Abstract

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11. Yui Matsuda, Kota Ikeda, Yumihiko S. Ikura, Hiraku Nishimori, and Nobuhiko J. Suematsu
    Dynamical Quorum Sensing in Non-Living Active Matter
    J. Phys. Soc. Jpn. 88, 093002 (2019). Editor's Choice
    Publication Date: August 6, 2019
    DOI: 10.7566/JPSJ.88.093002

    Abstract

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12. Masakazu Kuze, Mari Horisaka, Nobuhiko J. Suematsu, Takashi Amemiya, Oliver Steinbock, and Satoshi Nakata
    Chemical Wave Propagation in the Belousov?Zhabotinsky Reaction Controlled by Electrical Potential
    J. Phys. Chem. A 123, 4853-4857 (2019).
    Publicatino Date: May 16, 2019
    DOI: https://doi.org/10.1021/acs.jpca.9b02636

    Abstract

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13. Satoshi Nakata, Yasutaka Irie, and Nobuhiko J. Suematsu
    Self-Propelled Motion of a Coumarin Disk Characteristically Changed in Couple with Hydrolysis on an Aqueous Phase
    J. Phys. Chem. B 123, 4311-4317 (2019).
    Publication Date: April 22, 2019.
    DOI: https://doi.org/10.1021/acs.jpcb.8b11534

    Abstract

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14. Yuki Koyano, Nobuhiko J. Suematsu, and Hiroyuki Kitahata
    Rotational motion of a camphor disk in a circular region
    Phys. Rev. E 99, 022211 (2019).
    Publication Date: Feb. 19, 2019.
    DOI: https://doi.org/10.1103/PhysRevE.99.022211

    Abstract

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15. Kota Ohno, Nobuhiko J. Suematsu, and Toshiyuki Ogawa
    Competition between global feedback and diffusion in coupled Belousov-Zhabotinsky oscillators
    Phys. Rev. E 99, 012208 (2019).
    Publication Date: Jan. 10, 2019.
    DOI: https://doi.org/10.1103/PhysRevE.99.012208

    Abstract

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16. Ryoichi Tenno, You Gunjima, Miyu Yoshii, Hiroyuki Kitahata, Jerzy Gorecki, Nobuhiko J. Suematsu, Satoshi Nakata
    Period of Oscillatory Motion of a Camphor Boat Determined by the Dissolution and Diffusion of Camphor Molecules
    J. Phys. Chem. B 122, 2610-2615 (2018).
    Publication Date: Feb. 6, 2018.
    DOI: 10.1021/acs.jpcb.7b11903

    Abstract

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17. Hiraku Nishimori, Nobuhiko J. Suematsu, Satoshi Nakata
    Collective Behavior of Camphor Floats Migrating on the Water Surface
    J. Phys. Soc. Jpn. 86, 101012 (2017).
    Accepted: Jul. 20, 2017.
    DOI: 10.7566/JPSJ.86.101012

    Abstract

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18. Akiko Nakamasu, Nobuhiko J. Suematsu, Seisuke Kimura
    Asymmetries in leaf branch are associated with differential speeds along growth axes: A theoretical prediction
    Dev. Dynamics 246, 981-991 (2017).
    Accepted: Aug. 9, 2017

    Abstract

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19. Jerzy Gorecki, Hiroyuki Kitahata, Nobuhiko J. Suematsu, Yuki Koyano, Paulina Skrobanska, Marian Gryciuk, Maciej Malecki, Takahiro Tanabe, HiroyaYamamotod, and Satoshi Nakata
    Unidirectional motion of a camphor disk on water forced by interactions between surface camphor concentration and dynamically changing boundaries
    Phys. Chem. Chem. Phys. 19, 18767 (2017).
    Accepted: June 26, 2017.
    DOI: 10.1039/C7CP03252H

    Abstract

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20. Satoshi Nakata, Mio Nomura, Hiroya Yamamoto, Shunsuke Izumi, Nobuhiko J. Suematsu, Yumihiko Ikura, and Takashi Amemiya
    Periodic Oscillatory Motion of a Self-Propelled Motor Driven by Decomposition of H2O2 by Catalase
    Angew. Chem. Int. Ed. 56, 861-864 (2017).
    Accepted: Nob. 30, 2016.

    Abstract

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21. Takuma Ogawa, Erika Shoji, Nobuhiko J. Suematsu, Hiraku Nishimori, Shunsuke Izumi, Akinori Awazu, Makoto Iima
    The Flux of Euglena gracilis Cells Depends on the Gradient of Light Intensity PLoS ONE 11, e0168114 (2016).
    Accepted: Nob. 27, 2016.

    Abstract

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22. Nobuhiko J. Suematsu, Yoshihito Mori, Takashi Amemiya, and Satoshi Nakata
    Oscillation of Speed of a Self-Propelled Belousov－Zhabotinsky Droplet
    J. Phys. Chem. Lett. 7, 3424-3428 (2016).
    Accepted: Aug. 17, 2016. Published: Aug. 17, 2016.
    Doi: 10.1021/acs.jpclett.6b01539

    Abstract

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23. Satoshi Nakata, Hiroya Yamamoto, Yuki Koyano, Osamu Yamanaka, Yutaka Sumino, Nobuhiko J. Suematsu, Hiroyuki Kitahata, Paulina Skrobanska, and Jerzy Gorecki
    Selection of the Rotation Direction for a Camphor Disk Resulting from Chiral Asymmetry of a Water Chamber
    J. Phys. Chem. B 120, 9166-9172 (2016).
    Published: Aug. 8, 2016.
    Doi: 10.1021/acs.jpcb.6b05427

    Abstract

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24. Yui Matsuda, Nobuhiko J. Suematsu, Hiroyuki Kitahata, Yumihiko S. Ikura, Satoshi Nakata
    Acceleration or deceleration of self-motion by the Marangoni effect
    Chem. Phys. Lett 654, 92-96 (2016).
    Accepted: 3 May 2016. Available online: 7 May 2016.

    Abstract

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25. Tomohiro Sasaki, Nobuhiko J. Suematsu, Tatsunari Sakurai, and Hiroyuki Kitahata
    Spontaneous Recurrence of Deposition and Dissolution of a Solid Layer on a Solution Surface
    J. Phys. Chem. B 119, 9970-9974 (2015).
    Accepted: 1 Jul 2015. Published: 1 July 2015.
    Doi: 10.1021/acs.jpcb.5b03413

    Abstract

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26. Satoshi Nakata, Miyu Yoshii, Yui Matsuda, and Nobuhiko J. Suematsu
    Characteristic oscillatory motion of a camphor boat sensitive to physicochemical environment
    Choas 25, 064610 (2015).
    Accepted: 15 May 2015.
    Published: 29 May 2015.
    Doi: 10.1063/1.4921818

    Abstract

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27. Nobuhiko J. Suematsu, Kurina Tateno, Satoshi Nakata, Hiraku Nishimori
    Synchronized Intermittent Motion Induced by the Interaction between Camphor Disks
    J. Phys. Soc. Jpn. 84, 034802 (2015).
    Accepted: 21 January 2015.
    Published: 27 February 2015.
    Doi: 10.7566/JPSJ.84.034802

    Abstract

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28. Akiko Nakamasu, Hokuto Nakayama, Naomi Nakayama, Nobuhiko J. Suematsu, Seisuke Kimura
    A developmental model for branching morphogenesis of lake cress compound leaf
    PLOS ONE 9, e111615 (2014).
    Available online: 6 November 2014.
    Doi: 10.1371/journal.pone.0111615

    Abstract

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29. Mayuko Iwamoto, Nobuhiko J. Suematsu, and Daishin Ueyama
    "Spontaneous Formation of Unidirectional Path"
    Chem. Phys. Lett. 616-617, 248-253 (2014).
    Available online: 31 October 2014.
    Doi: 10.1016/j.cplett.2014.10.010

    Abstract

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30. Nobuhiko J. Suematsu, Tomohiro Sasaki, Satoshi Nakata, and Hiroyuki Kitahata
    "Quantitative Estimation of the Parameters for Self-Motion Driven by Difference in Surface Tension"
    Langmuir 30, 8101-8108 (2014).
    Published: June 16, 2014.
    Doi: 10.1021/la501628d

    Abstract

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31. Yui Matsuda, Miyu Yoshii, Nobuhiko J. Suematsu, Shunsuke Izumi, and Satoshi Nakata
    "Self-propelled motor driven by a glucose engine"
    Chem. Lett. 43, 453-455 (2014).
    Accepted: December 05, 2013.
    Doi: 10.1246/cl.131082

    Abstract

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32. Shu-ichi Kinoshita, Mayuko Iwamoto, Keita Tateishi, Nobuhiko J. Suematsu, and Daishin Ueyama
    "Mechanism of spiral formation in heterogeneous discretized excitable media"
    hys. Rev. E 87, 062815 (2013). - Accepted Thursday Jun 6, 2013.

    Abstract

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33. ric Heisler, Nobuhiko J. Suematsu, Akinori Awazu, and Hiraku Nishimori
    "Collective Motion and Phase Transitions of Symmetric Camphor Boats"
    J. Phys. Soc. Jpn. 81, 074605 (2012). - Accepted Tuseday May 1, 2012.

    Abstract

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34. Eric Heisler, Nobuhiko J. Suematsu, Akinori Awazu, and Hiraku Nishimori
    "Swarming of self-propelled camphor boats"
    Phys. Rev. E 85, 055201(R) (2012).- Accepted Thursday Apr 26, 2012.

    Abstract

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35. Yui Matsuda, Nobuhiko J. Suematsu, and Satoshi Nakata
    "Photo-sensitive self-motion of a BQ disk"
    Phys. Chem. Chem. Phys. 14, 5988-5991 (2012).

    Abstract

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36. Yumihiko S. Ikura, Ryoichi Tenno, Hiroyuki Kitahata, Nobuhiko J. Suematsu, and Satoshi Nakata
    "Suppression and regeneration of camphor-driven Marangoni flow with the addition of sodium dodecyl sulfate"
    J. Phys. Chem. B 116, 992-996 (2012).

    Abstract

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37. Nobuhiko J. Suematsu, Taisuke Sato, Ikuko N. Motoike, Kenji Kasima, and Satoshi Nakata
    "Density Wave Propagation of a Wave Train in a Closed Excitable Medium"
    Phys. Rev. E 84, 046203 (2011).

    Abstract

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38. Satoshi Nakata, Mariko Matsushita, Taisuke Sato, Nobuhiko J. Suematsu, Hiroyuki Kitahata, Takashi Amemiya, and Yoshihito Mori
    "Photoexcitaed Chemical Wave in the Ruthenium-Catalyzed Belousov-Zhabotinsky Reaction"
    J. Phys. Chem. A 115, 7406-7412 (2011).

    Abstract

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39. Nobuhiko J. Suematsu, Akinori Awazu, Shuhei Noda, Shunsuke Izumi, Satoshi Nakata, and Hiraku Nishimori
    "Localized bioconvection of Euglena caused by phototaxis in the lateral direction"
    J. Phys. Soc. Jpn. 80, 064003 (2011).

    Abstract

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40. Nobuhiko J. Suematsu, Yumi Miyahara, Yui Matsuda, and Satoshi Nakata
    "Self-Motion of a Benzoquinone Disk Coupled with a Redox Reaction"
    J. Phys. Chem. C 114, 13340 (2010).

    Abstract

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41. Nobuhiko J. Suematsu, Akinori Awazu, Satoshi Nakata, and Hiraku Nishimori
    "Collective behaviour of inanimate boats"
    Phys. Rev. E 81, 056210 (2010).

    Abstract

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42. Nobuhiko J. Suematsu, Yumihiko Ikura, Masaharu Nagayama, Hiroyuki Kitahata, Nao Kawagishi, Mai Murakami, and Satoshi Nakata
    "Mode-switching of the self-motion of a camphor boat depending on the diffusion distance of camphor molecules"
    J. Phys. Chem. C 114, 9876-9882 (2010).

    Abstract

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43. Keita Iida, Nobuhiko J. Suematsu, Yumi Miyahara, Hiroyuki Kitahata, Masaharu Nagayama, and Satoshi Nakata
    "Experimental and theoretical studies on the self-motion of a phenanthroline disk coupled with complex formation"
    Phys. Chem. Chem. Phys. 12, 1557-1563 (2010).

    Abstract

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44. Satoshi Nakata, Nao Kawagishi, Mai Murakami, Nobuhiko J. Suematsu, and Motohiko Nakamura
    "Intermittent motion of a camphor float depending on the nature of the float surface on water"
    Colloid Surface A 349, 74-77 (2009).

    Abstract

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45. Nobuhiko J. Suematsu, Satoshi Nishimura, and Tomohiko Yamaguchi
    "Release and Transfer of Polystyrene Deweting Pattern by Hydration Froce"
    Langmuir 24, 2960-2962 (2008).

    Abstract

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46. Nobuhiko J. Suematsu, Yumi Ogawa, Yasuhiko Yamamoto, Tomohiko Yamaguchi
    "Dewetting self-assembly of nanoparticles into hexagonal array of nanorings"
    J. Colloid Interface Sci. 310, 648-652 (2007).

    Abstract

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47. Hitoshi Mahara, Nobuhiko J. Suematsu, Tomohiko Yamaguchi, Kunishige Ohgane, Yasumasa Nishiura, Masatsugu Shimomura
    "Three-variable reversible Gray-Scott model"
    J. Chem. Phys. 121, 8968-8972 (2004).

    Abstract

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48. Tomohiko Yamaguchi, Nobuhiko J. Suematsu, Hitoshi Mahara,
    "Self-Organization of Hierarchy",
    ACS Symposium Series 869, 16-27 (2004).

    Abstract

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1. Nobuhiko J. Suematsu
   "Collective Behaviour of Self-propelled Objects on a Water Surface"
   Self-organized Motion : Physicochemical Design based on Nonlinear Dynamics
   Eds. S. Nakata, V. Pimienta, I. Lagzi, H. Kitahata, N. J. Suematsu, Chap. 9, 204-225 (2018).

   

2. Nobuhiko J. Suematsu and Satoshi Nakata
   "Evolution of Self-Propelled Objects: From the Viewpoint of Nonlinear Science"
   Chemistry - A European Journal 24, 6308-6324 (2018).

   

3. Nobuhiko J. Suematsu, Yoshihito Mori, Takashi Amemiya, and Satoshi Nakata
   "Nonlinear Behavior of a Self-Propelled Droplet Coupled with a Chemical Oscillatory Reaction"
   Conplexity and Synergetics (2018).

   

4. Satoshi Nakata, Masaharu Nagayama, Hiroyuki Kitahata, Nobuhiko J. Suematsu, and Takeshi Hasegawa
   "Physicochemical design and analysis of self-propelled objects that are characteristically sensitive to environments"
   Phys. Chem. Chem. Phys. 17, 10326-10338 (2015).
   Published: March 24 (2015).
   Doi: 10.1039/C5CP00541H

   

5. Nobuhiko J. Suematsu and Satoshi Nakata
   "Self-Propelled Object Response to Environment"
   Current Phys. Chem. 5, 21 - 28 (2015).
   Accepted: January 27, 2015.
   Dio: 10.2174/187794680599915043012404

   

6. Nobuhiko J. Suematsu
   "Localized Ordered Pattern in a Hybrid System of Hydrodynamics and Collective Motion"
   J. Phys. Soc. Jpn. News and Comments 11, 06 (2014).
   Published: April 28, 2014.
   Doi: 10.7566/JPSJNC.11.06

   

1. ICMMA 2019 International Conference on "Spatio-temporal patterns on various levels of the hierarchy of life" ('19.12.09-12)
   "Self-Propelled Droplets with Internal Chemical States"
2. Okinawa Colloids 2019（'19.11.02-08）
   "Spontaneous Droplet Motion Driven by an Interfacial Chemical Reaction of Surfactants"
3. Active Matter 2018 @ Fukui Institute for Fundamental Chemistry, Kyoto Univ. ('18.01.19-20)
   "Self-Propelled Objects from Viewpoint of Nonlinear Science"
4. Symposium "Complexity and Synergetics" ('15.7.8-11)
   Self-propelled motion coupled with chemical reaction
5. EMN Meeting on Droplets ('15.5.8-11)
   Self-Propelled Droplet Response to Internal Chemical Conditions
6. MIMS/CMMA Two Days ReaDiLab Workshop ('13.07.24)
   Self-Propelled Particles Driven by Chemical Energy
7. Meiji One day ReaDiLab meeting ('12.11.29)
   Bioconvection Pattern Generated by Collective Behavior of Microorganisms
8. Lecture on Global COE Program, Meiji University "Advanced Mathematical Sciences II" ('10.10.25)
   Spatio-temporal pattern of fluid and its application to construct a hierarchic structure
9. Lecture on Global COE Program, Meiji University "Advanced Mathematical Sciences I" ('10.09.15)
   Collective behavior of micro-organisms induced by phototaxis
10. MAS seminar @ Meiji Univ., Poster (pdf) ('09.11.18)
    Localized Bioconvection of Euglena Caused by Phototaxis in the Lateral Direction

Oral presentation

1. Mini-Symposium on Fundamental Mechanism for Generation and Breakdown of Spiral Pattern ('18.03.19)
   "Spiral Pattern Formation in Chemical and Physical Systems"
2. Symposium of bilateral project between JSPS and PAN (Polish Academy of Sciences, Poland) (2017.3.3) ＠ Hiroshima University (A018 room)
   "Mode-Switching of Self-Propelled Motion of BZ Droplet"
3. "Mini-symposium on cooperative phenomena innonequilibrium systems" @ 千葉大学 ('16.3.04)
   Spatiotemporal Pattern Formed by Self-Propelled Particles
4. "An Interdisciplinary Workshop between Nonlinear Science and the Study of Time" @ Yamaguchi University ('16.3.26)
   Rhythmic Behavior Induced by Interaction between Self-Propelled Particles
5. Pacifichem2015 - Self-organization in Chemistry (#165) - @ Hawaii ('15.12.17-18)
   Oscillatory motion of self-propelled Belousov-Zhabotinsky droplet
6. Japanese-Hungarian Conference on Applied Mathematics and Nonlinear Dynamics @ Budapest, Hungary ('13.12.12)
   Collective motion of camphor boats
7. Gordon Research Conference (Cobey Univ., USA) ('12.07.15-20)
   Localized Bioconvection of Photosynthetic Microorganisms
   

1. Gordon Research Conference Oscillations and Dynamic Instabilities in Chemical Systems ('18.07.08-14)
   "Chemotactic Behavior of a Self-Propelled Disk Mimicking Bacterial Chemotaxis"
2. Symposium on Nonlinear Sciences ~ The History for 30 Years and Vision for The Future ('16.09.27)
   Nonlinear Behavior of Self-Propelled Droplet
3. Symposium on Nonlinear Sciences ~ The History for 30 Years and Vision for The Future ('16.09.27)
   Nonlinear Behavior of Self-Propelled Droplet
4. ICMMA 2014 'Crowd Dynamics' ('15.01.11)
   Synchronized Intermittent Motion Induced by the Collection of Camphor Disks
5. Gordon Research Conference - Oscillations & Dynamic Instabilities in Chemical Systems @ Spain ('14.7.14-18)
   Mode Switching of Self-Propelled Droplet Coupled with Oscillatory Belousov-Zhabotinsky Reactionion
6. Gordon Research Conference (Cobey Univ., USA) ('12.07.15-20)
   Localized bioconvection originated from intercellular interaction through light field
7. Collective Dynamics and Pattern Formation in Active Matter Systems ('11.09.12)
   Collective behavior of camphor boats on a annular water channel
8. 9^th iCeMS International Symposium "Mesoscale Control and Engineering of Self-Organized and Excitable Systems in Biology and Chemistry" ('10.12.02)
   Density Wave Propagation of a Wave Train
9. Gordon Research Conference 2010: Oscillations & Dynamic Instabilities in Chemical Systems ('10.07.4-9)
   Localized Bioconvection Generated by Schooling Behavior of Phototactic Micro-organisms

1. National Geographic