Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


LAST UPDATE 2021/05/18

  • 研究者氏名
    Researcher Name

    粕谷素洋 Motohiro KASUYA
    助教 Assistant Professor
  • 所属
    Professional Affiliation

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    プロセスシステム工学研究部門 ハイブリッドナノ粒子プロセス研究分野
    Division of Process and System Engineering, Hybrid Nano-particle
  • 研究キーワード
    Research Keywords

    Resonance shear measurement (RSM)
    Confined liquid
    Electrochemical surface forces apparatus (EC-SFA)
    SFA fluorescence spectroscopy
Research Subject
Development of the novel methods based on surface forces apparatus for the characterization of the confined liquid.

研究の背景 Background


Liquids confined in nanospaces exhibit different properties from those of bulk liquids due to liquid structuring induced by restriction of their molecular motion in nanospaces and by their interactions with solid surfaces. Evaluation of their properties is important in many research fields such as nanofunctional materials, and tribology

研究の目標 Outcome


To improve the performance of the nano-functional materials, we evaluate the properties of the confined liquid by the novel methods based on the surface forces apparatus (SFA). Resonance shear measurement(RSM) reveals nano- rheological and tribological properties of the liquid. Electrochemical SFA provides the surface potential, charge density, and ion adsorption on the electrode. SFA fluorescence spectroscopy provides the viscosity and pH of the confined liquid. We also perform a fluorescence spectrum and lifetime measurement system for a confined liquid film which can regulate the film thickness D using the twin-path SFA3),4). Using this system, we evaluated viscosity3) and pH4) of a confined liquid from spectra and lifetimes of fluorescence probes in the liquid.

研究図Research Figure

Fig.1. Resonance peak amplitude under various normal pressures on thin films of water between silica surfaces. Inset: Plots of surface separation (D) as a function of P. Fig.2. Force-distance profiles between the surfaces of the ferrocene (Fc0) or ferrocenium (Fc+) modified electrode in 1 mM aqueous electrolyte solution. Fig.3. Viscosity of glycerol confined between mica surfaces, evaluated from the fluorescence lifetime of probe molecule, Cy1.

文献 / Publications

Langmuir, 30, 7093 (2014). J. Phys. Chem. C, 117, 20738 (2013). Chem. Lett., 41, 1282 (2012). Chem. Lett., 40, 776 (2011).
Chem. Lett., 40, 674 (2011). Phys. Chem. Chem. Phys., 12, 4066 (2010).