Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 89 , Issue 3
Showing 1-7 articles out of 7 articles from the selected issue
Special Edition Development and Applications of Liquid Marble and Encapsulation Technologies
Materials
Review
Serial Lecture
  • Takashi OKAMOTO
    2016 Volume 89 Issue 3 Pages 93-97
    Published: March 20, 2016
    Released: June 20, 2016
    JOURNALS RESTRICTED ACCESS
    Propagation and scattering of light in a medium is one of the major topics in the study of color materials as well as in many other research fields. Several optical theories dealing with the topic have been developed so far, including geometrical optics and quantum optics. If the minimum length scale of an object of interest is much larger than the wavelength of light, we can discuss the problems of light reflection and refraction by treating the light as rays. For smaller length scales, however, there are some phenomena which cannot be described by geometrical optics. In this case, we need to treat light as scalar or vector waves. The present article presents the theoretical treatment of light phenomena in the context of wave and electromagnetic optics. The finite-difference time-domain method is introduced as a numerical method for analyzing light propagation and scattering in complex media.
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  • Kenji ARAMAKI
    2016 Volume 89 Issue 3 Pages 98-101
    Published: March 20, 2016
    Released: June 20, 2016
    JOURNALS RESTRICTED ACCESS
    Surfactant function is achieved by adsorption to interface and formation of molecular assemblies. Upon increasing surfactant concentration in water, micelles and lyotropic liquid crystals are formed. These phase transitions are generally presented in a phase diagram. The structures of lyotropic liquid crystals formed in a concentrated system are mainly determined by molecular packing of surfactant molecules. Poly(oxyethylene) alkyl ethers, which are a typical type of nonionic surfactant, show structural transitions of lyotropic liquid crystals by changing polymerization degree of the hydrophilic chain due to the change in repulsion between hydrophilic groups. Such structural transitions can be explained by the critical packing parameter. The lyotropic liquid crystals can be applied to the synthesis of mesoporous materials or drug carriers in DDS. The shape of micelles formed in a dilute system also changes depending on the repulsion between hydrophilic groups. Especially wormlike micelles that have an elongated shape like polymer chains increase viscosity of a micellar solution. Wormlike micelles can be applied to DR agents or foam boosters by this feature.
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