Page 12 - Shimadzu Journal vol.6 Issue1

Shimadzu Shimadzu selected the following articles for this issue. They derive from application notes related to
Selection material sciences, and utilize a variety of Instruments we produce. Cutting-edge technologies are also
included.

Selection 1 Material Science
Structural and Physical Properties of Liquid Marble
Pressure-sensitive adhesive (PSA) powder consists of particles with a soft adhesive polymer core and a hard particle shell morphology
that shows no adhesion and flows like a powder in its original form. Droplets stabilized by adsorbing solid particles on its surface are
termed as liquid marbles. Only after application of shear stress, does PSA show its adhesive nature. Adhesion is induced by rupture of
the nanoparticle coating of the powder and outflow of the inner soft polymer. We investigated the structural and adhesive properties
using a Nano Search microscope, an electron probe microanalyzer (EPMA), a microfocus X-ray CT system, and a probe tack tester.
®

Selection 2 Material Science
Preparation of Mimetic Materials of Shells and Their Properties
Since the hardness and toughness of natural nacre are determined by hierarchical microstructures with organic matters, it is of great importance
to control the microstructures of artificial free-standing CaCO3 thin films. However, because the fabrication of such films has so far been quite
limited, their mechanical properties have not been reported to a significant extent. To address this, free-standing calcite thin films were prepared
through repeated cycles of layer-by-layer deposition of vaterite precursor composite particles with organic polymers, followed by a phase
transition to calcite. The vaterite precursor composite particles were obtained by using a carboxylate-terminated poly(amidoamine)
8)
(PAMAM)-type T8-caged silsesquioxane-core dendrimer (POSS-(COOH) or an octacarboxy-terminated T8-caged silsesquioxane (POSS-(COOH) .
16)
Incubation of the vaterite composite particles in distilled water for 3 days led to complete phase transition to calcite. Calcite thin films were
obtained on a glass substrate pre-coated with a poly(diallyldimethylammonium chloride) (PDDA) layer or a multilayer of PDDA with poly(sodium
4-styrenesulfonate) (PSS) through repeated cycles of layer-by-layer deposition of the vaterite particles, followed by a phase transition to calcite.
Free-standing calcite thin films were obtained through repeated cycles of this process after PDDA and PSS were coated on the surface of the
calcite thin films. In this way, six distinct calcite thin film types were produced, with subsequent three-point bending tests revealing that all
exhibit elastic bending prior to fracture.

Selection 3 Material Science
Color Analysis of New Optical Film (MLF) with Super Multilayer Structure Based on the Incident
Angle of Light
Teijin DuPont Films Japan Limited has developed a new multilayer optical film (MLF) that has a super multilayer structure. This
structure is designed to mimic the wing of a morpho butterfly, which creates color structurally. The key characteristics of structural
coloration are that coloration varies according to the angle of view, and unlike pigments, the color does not fade because the color
is produced due to its structure. In this paper, we describe using the SolidSpec-3700DUV spectrophotometer with a variable angle
absolute reflectance attachment to perform measurements of a new multilayer optical film based on the incident angle of light.
We confirmed that changing the incident angle of light to a MLF film changes the transmittance spectrum. In addition, using the
L*a*b* color space to evaluate the transmittance spectrum, we were able to digitize the color and confirm the correlation
between the visual color changes and the numerical values.

Selection 4 Material Science
Fluorescence Measurement of Organic Electroluminescent Material
Screens, lighting, and other products that incorporate organic electroluminescent (EL) materials are being developed on a daily
basis in the electrical and electronic goods sector. Organic EL material development involves the synthesis of new substances and
verification of their optical properties using photoluminescence (PL) technique. Researching the PL allows us to find materials
that emit light with high efficiency, and we can elucidate the mechanism of its fluorescence in solution. Organic EL materials are
developed through this process to meet specific criteria that can include hue, low energy consumption, or high luminous efficiency.
In order to evaluate organic EL materials, fluorescence must be measured quickly and accurately over a wide range of wavelengths.
Introduced here are the measurements of porphyrin solution (solvent: chloroform), an organic EL material, using an RF-6000
spectrofluorophotometer, with the help of the Institute for Basic Science, Pohang University of Science and Technology (POSTECH),
South Korea.

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