Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 93 , Issue 10
Showing 1-5 articles out of 5 articles from the selected issue
Original Research Paper
Original Technical Paper
  • Ayane SAWADA, Momoka SANO, Yoshimune NONOMURA
    2020 Volume 93 Issue 10 Pages 309-314
    Published: October 20, 2020
    Released: October 27, 2020

    Brushes are used in various make-up processes. However, there are few reports on quantitative analysis of movement and mechanical stimuli in the make-up process, and factors that control the usability of the make-up tool. In this study, we developed a system consisting of a high-speed camera and a mechanical evaluation device to evaluate motion and vertical/friction forces when a subject draws a line on a nail-tip with a brush. Here, we analyzed the relationship between movement and finish when 20 subjects drew a line using a commercially available nail enamel on a tip. The mechanical data suggest that the adjustment of the strength of the force and the angle of the brush, and the stable application process in which the vertical force gradually increases are important for drawing a straight line with uniform width. The present findings are useful to show the controlling factors of make-up cosmetics.

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  • Miyuki MIYAKE, Masatoshi KURIOKA
    2020 Volume 93 Issue 10 Pages 315-320
    Published: October 20, 2020
    Released: October 27, 2020

    Nanoemulsions of a lipophilic vitamin A (VA) have a therapeutic effect on corneal damage. The nanoemulsion with a triblock-type polymer surfactant F127 (EOPO) showed superior efficacy. To understand the mechanism of the efficacy of EOPO nanoemulsions, we studied their inner structure and their interaction to corneal epithelial cell. It was found that they had a partially exposed vitamin core interface and interacted with lipid bilayer by their hydrophobicity. Accordingly, EOPO nanoemulsions induced the endocytic morphological changes on giant unilamellar vesicles (GUVs) and the plasma membrane of corneal epithelial cell, and promoted the membrane permeability and the efficacy of VA.

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Serial Lecture
  • -Nanomechanical Properties Analysis on Soft Materials-
    Ken NAKAJIMA, Kei SEKINE, Kaede MOGI, Makiko ITO, Xiaobin LIANG
    2020 Volume 93 Issue 10 Pages 321-328
    Published: October 20, 2020
    Released: October 27, 2020

    Nanomechanical analysis based on atomic force microscopy was reviewed together with the brief introduction of contact mechanics, especially JKR two-point method, necessary for the analysis. Thermoplastic vulcanizate (TPV) consisting of PP/EPDM was investigated as a model specimen for this analysis. The PP region was not pure PP region but the region contained EPDM to some extent and thereby the local mechanical response was softer than that of pure PP. In the latter half of this manuscript, Greenwood theory was reviewed by anticipating the future possibility to utilize it as the tool to extract viscoelastic properties from AFM force-distance curve.

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Serial Lecture
  • Satoshi INOUE, Kaori FUKUDA, Naoki TSUKAHARA, Yoichi AYA
    2020 Volume 93 Issue 10 Pages 329-334
    Published: October 20, 2020
    Released: October 27, 2020

    Pigments such as titanium oxide in water-based paints are dispersed in emulsion resin that acts as a binder. It is assumed that not only the dispersant added to disperse the pigment but also the surfactant on the surface of emulsion resin affects the paint performance.

    Few reports have however examined the pigment dispersion in actual paint systems.

    In this report, we explain the impact of different surfactants used for emulsion resin synthesis on titanium oxide dispersibility and coating film performance, such as weathering resistance, and the improvement method for dispersibility.

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