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

Job Title


Research Fields, Keywords

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

Related SDGs


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

Campus Career 【 display / non-display

  • 2020.04

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Artificial Environment and Information   Professor  

  • 2007.04

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Artificial Environment and Information   Associate Professor  

  • 2005.10

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Artificial Environment and Information   Associate Professor  

  • 2001.04

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Artificial Environment and Information   Research Associate  

  • 1999.04

    Duty   Yokohama National UniversitySchool of Engineering   Research Associate  

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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

  • Cation Effect on the Binary and Ternary Phase Behaviors of Double-Tailed Methanesulfonate Amphiphiles

    Ontiveros Jesus F., Hong Bing, Aramaki Kenji, Pierlot Christel, Aubry Jean-Marie, Nardello-Rataj Ve … Show more authors


    Joint Work

    Web of Science DOI

  • Effect of Adding Lecithin and Nonionic Surfactant on alpha-Gels Based on a Cationic Surfactant-Fatty Alcohol Mixture

    Aramaki Kenji, Matsuura Yuka, Kawahara Katsuki, Matsutomo Daisuke, Konno Yoshikazu

    JOURNAL OF OLEO SCIENCE ( 公益社団法人 日本油化学会 )  70 ( 1 )   67 - 76   2021  [Refereed]

    Joint Work

     View Summary

    <p>α-Gels are often used as base materials for cosmetics and hair conditioners. α-Gel-based commercial products typically contain many types of additives, such as polymers, electrolytes, oily components, and other surfactants, in addition to the three basic components. However, few systematic studies have been conducted on the effect of such additives on α-gels. In this study, we chose surfactant as an example to initiate the effect of such additives on the structure and rheological properties of α-gel samples formulated using cetyl alcohol (C<sub>16</sub>OH) and cetyltrimethylammonium chloride (CTAC). Optical microscopy analysis demonstrated that the size of the vesicles in the α-gel samples in this study was decreased via the addition of hydrogenated soybean lecithin (HSL) and penta(oxyethylene) cetyl ether (C<sub>16</sub>EO<sub>5</sub>), a nonionic surfactant, to them. Rheological measurements revealed that at high C<sub>16</sub>OH/CTAC ratios, the viscosity and yield stress of the α-gel samples decreased owing to the addition of surfactants to them. Conversely, at low C<sub>16</sub>OH/CTAC ratios, the opposite tendency was observed. Small-angle X-ray scattering analysis indicated that for the α-gel samples with high C<sub>16</sub>OH/CTAC ratios, the addition of HSL or C<sub>16</sub>EO<sub>5</sub> to them decreased the interlayer spacing of their lamellar bilayer stack, which led to the changes in the rheological properties of the α-gel samples.</p>

    Web of Science DOI CiNii

  • Coacervation in cationic polyelectrolyte solutions with anionic amino acid surfactants

    Kenji Aramaki, Yasutaka Shiozaki, Shuhei Kosono, Naoaki Ikeda

    Journal of Oleo Science ( 公益社団法人 日本油化学会 )    2020.09  [Refereed]

    Joint Work

  • Formulation of Bicelles Based on Lecithin-Nonionic Surfactant Mixtures

    Kenji Aramaki, Keita Adachi, Miho Maeda, Jitendra Mata, Junko Kamimoto-Kuroki, Daisuke Tsukamoto, Y … Show more authors

    Materials   13   3066   2020.07  [Refereed]  [Invited]

    Joint Work

     View Summary

    Bicelles have been intensively studied for use as drug delivery carriers and in biological studies, but their preparation with low-cost materials and via a simple process would allow their use for other purposes as well. Herein, bicelles were prepared through a semi-spontaneous method using a mixture of hydrogenated soybean lecithin (SL) and a nonionic surfactant, polyoxyethylene cholesteryl ether (ChEO10), and then we investigated the effect of composition and temperature on the structure of bicelles, which is important to design tailored systems. As the fraction of ChEO10 (XC) was increased, a bimodal particle size distribution with a small particle size of several tens of nanometers and a large particle size of several hundred nanometers was obtained, and only small particles were observed when XC ≥ 0.6, suggesting the formation of significant structure transition (liposomes to bicelles). The small-angle neutron scattering (SANS) spectrum for these particles fitted a core-shell bicelle model, providing further evidence of bicelle formation. A transition from a monomodal to a bimodal size distribution occurred as the temperature was increased, with this transition taking place at lower temperatures when higher SL-ChEO10 concentrations were used. SANS showed that this temperature-dependent size change was reversible, suggesting the SL-ChEO10 bicelles were stable against temperature, hence making them suitable for several applications.


  • Hydrogelation with a water-insoluble organogelator - surfactant mediated gelation (SMG)

    Kenji Aramaki, Sachi Koitani, Eriko Takimoto, Masashi Kondo, Cosima Stubenrauch

    Soft Matter   15 ( 43 )   8896 - 8904   2019.11  [Refereed]

    Joint Work

    Web of Science DOI

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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 

Past of Collaboration and Commissioned Research 【 display / non-display

  • Improvement of mechanical strength of wormlike micellar gel by cellurose nanofiber

    Offer organization: Chalmers University of Technology   International Cooperative Research  

    Project Year: 2018.04  -  2019.03 

  • Construction of soft matters based on orthogonal self-assembled systems

    Offer organization: University of Stuttgart   International Cooperative Research  

    Project Year: 2018.04  -  2019.03 

  • Soft materials based on new bio-based surfactants

    Offer organization: National Graduate School of Engineering Chemistry of Lille   International Cooperative Research  

    Project Year: 2017.04  -  2019.03