Faculty of Environment and Information Sciences, Division of Artificial Environment and Information


Associate Professor

Research Fields, Keywords

surfactant, molecular self-assembly, micro emulsion, gel, emulsion, solubilization, complex fluid, washing, cosmetics

Graduating School 【 display / non-display


    Yokohama National University   Faculty of Engineering   Division of Material Science and Chemical Engineering   Graduated

Graduate School 【 display / non-display


    Yokohama National University  Graduate School, Division of Engineering  Doctor Course  Unfinished course

Degree 【 display / non-display

  • Doctor of Engineering -  Yokohama National University

Academic Society Affiliations 【 display / non-display


    Chemical Society of Japan


    Japan Oil Chemist's Society


    The Society of Chemical Engineers


    American Chemical Society

Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display

  • Organic and hybrid materials

  • Functional solid state chemistry


Books 【 display / non-display

  • Encyclopedia of Biocolloid and Biointerface Science

    Hiroyuki Ohshima et al. (Part: Joint Work )

    Wiley  2016.09 ISBN: 978-1-118-542


  • Foam Engineering

    Lok Kumar Shrestha, Kenji Aramaki (Part: Joint Work )

    Wiley  2012 ISBN: 9780470660805

  • Encyclopedia of Surface and Colloid Science

    Kenji Aramaki, Anil Kumar, Hironobu Kunieda (Part: Joint Work )

    Marcel Dokker, New York  2001 ISBN: 0-8247-0796-6

Papers 【 display / non-display

  • Demonstration of Novel Charge-Free Reverse Wormlike Micelle System

    Kenji Aramaki, Kaoru Ooishi, Misaki Fujii, Katsuhiko Ariga, Lok Kumar Shrestha

    Langmuir ( American Chemical Society )  34 ( 29 )   8670 - 8677   2018.07  [Refereed]

    Joint Work

     View Summary

    We demonstrate a novel charge-free reverse wormlike micelle (RWLM) consisting of a ternary mixture of nonionic amphiphilic block copolymer, fatty acid alkyl ester oil and water under ambient conditions. Nonionic amphiphile tetra-[poly(oxyethylene)-poly(oxybutylene)] pentaerythrityl ether (TEBPE) self-assembled into spheroid type micelles in nonaqueous media isopropyl myristate (IPM) with viscosity comparable to that of IPM. Addition of water increases viscosity only slightly up to a certain concentration of water and then drastically demonstrating the sphere-to-wormlike micelle transition as confirmed by small-angle X-ray scattering (SAXS). Further increase in water decreases the viscosity after attaining a maximum value. Zero-shear viscosity (eta-0) of 10 wt% TEBPE/IPM system reached maximum at 2.6 wt% water and ca. 56 Pa·s, which is ~5 fold higher than of water. Dynamic rheological measurements on the highly viscous solutions confirmed viscoelastic behavior and could be described by the Maxwell model. Conductivity, measured in presence of conductive probe, 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4])) was found to be higher for viscous samples compared to the non-viscous samples suggesting the static percolation caused by the RWLM formation. Decrease in eta-0 and conductivity beyond a maximum suggests the shortening of reverse micelles. A similar behavior has been observed in other fatty acid alkyl ester oils of different alkyl chain length. Note that most of the RWLM systems previously reported are based on phosphatidylcholine (PC).

    Web of Science DOI PubMed

  • Cholesterol-Induced Formation of Liquid Ordered Phase-like Structure in Non-Phospholipid Systems

    Yoshikazu Konno, Akio Yoshimura, Noboru Naito, Kenji Aramaki

    Journal of Oleo Science ( Japan Oil Chemists' Society )  67 ( 4 )   419 - 426   2018.04  [Refereed]

    Joint Work

    Web of Science DOI PubMed

  • Rheological properties of wormlike micellar gels formed by novel bio-based isosorbide surfactants

    Miho Kamada, Christel Pierlot, Valérie Molinier, Jean-Marie Aubry, Kenji Aramaki

    Colloids Surf. A ( Elsevier )  536   82 - 87   2018.01  [Refereed]

    Joint Work

    Web of Science DOI

  • Emulsion-Based Gels with Thermally Switchable Transparency

    Kenji Aramaki, Kazuki Masuda, Ryosuke Horie, Carlos Rodríguez-Abreu

    Colloids and Surfaces A ( Elsevier )  533   302 - 307   2017.11  [Refereed]

    Joint Work

    Web of Science DOI

  • Gelling Lamellar Phases of the Binary System Water - Didodecyldimethylammonium Bromide with an Organogelator

    Sachi Koitani, Sonja Dieterich, Natalie Preisig, Kenji Aramaki, Cosima Stubenrauch

    Langmuir ( AMER CHEMICAL SOC )  33 ( 43 )   12171   2017.10

    Joint Work

    Web of Science DOI PubMed

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Review Papers 【 display / non-display

  • Wormlike Micellar Formation by Using Surfactant Derived From Renewable Resources

    Accounts of Materials&Surface Research     2018.10  [Refereed]  [Invited]

    Introduction and explanation (others)   Joint Work

     View Summary

    Shape of surfactant micelles may change to spherical, rod-like, or wormlike micelle depending on the surfactant concentration in the aqueous solution and the hydrophilic-lipophilic balance. Wormlike micelles entangle like polymer chains and increase the viscosity of the solution. Solution viscosity may reach up to 10 million times the viscosity of water. In addition, such a thickened solution becomes a non-Newtonian viscoelastic body exhibiting thixotropy and a Maxwell-type relaxation behavior having a single relaxation time like a polymer solution. Unlike polymer, wormlike micelles, which are supramolecular assembly systems, has self-repairing ability against chain breaking due to mechanical disturbance by mechanical force, heat, light, etc. Because of these characteristics, wormlike micelles are used for viscosity control in detergents (e.g. shampoo) and cement as well as fluid transport by drag reduction (DR) effect. Petroleum-based surfactants are conventionally used in these applications, but the use of surfactants derived from renewable resources (bio-based surfactant) is demanded from the viewpoint of appeal to consumers as well as environmental problems. In this review, some examples of wormlike micelle formation from our studies are briefly described. Bio-based surfactants used are commercially-available ones such as acyl glutamate, sucrose fatty acid ester, polyoxyethylene cholesteryl ether in addition to a newly developed surfactant, isosorbide-based surfactant.

  • Liquid Crystal-Based Emulsions:Progress and Prospects

    Md.Mydul Alam, Kenji Aramaki

    J. Oleo Sci,   63   97 - 108   2014.04  [Refereed]  [Invited]

    Introduction and explanation (bulletin of university, research institution)   Joint Work

Grant-in-Aid for Scientific Research 【 display / non-display

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2018.04  -  2021.03