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When a colloidal dispersion is dried, it often forms a ring-shaped pattern (commonly known as a "coffee ring"). What we are introducing this time is a case study that investigates how the mechanism differs based on particle size. In the droplet, particles are convecting, and larger particles have stronger van der Waals forces, making them more likely to aggregate. This moderate aggregation force prevents the particles from concentrating at the edges when the droplet shrinks, making it less likely for a coffee ring to form. *For more details about the case study, please refer to the related links. Feel free to contact us for further information.*

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The photos showing the structural color of the sample were taken with a digital camera and a digital microscope (KEYENCE VHX-500). For angle dependence, two types of illumination were used. The first type (diffused light) is illumination that does not come from a specific direction, and the sample is illuminated by several ceiling lights and secondary scattering from the walls. The second type is illumination via fiber (Olympus, LG-PS2). The illumination light is directed from approximately 50 degrees tilted from the normal direction. The arrangement of silica particles in the secondary particles was evaluated using an electron microscope. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.

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This is an example of using secondary particles mixed with black particles (carbon black) to achieve a more distinct structural color while controlling the aggregation of silica colloid particles. It seems that without adding NaCl, a dull, whitish color was obtained. However, by adding a small amount of carbon black, the white light due to scattering decreased, making the structural color more clearly visible. Furthermore, when magnetic iron powder was added, the secondary particles moved and gathered in response to the magnetic field. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

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An example of creating a two-layer TiO2/BiVO4 framework with an inverse opal structure to enhance photocatalytic ability. It has been confirmed that the photocatalytic ability increased by 8.5 times and 2.2 times compared to single-layer and single-film inverse opal structures, respectively. The high periodicity of the inverse opal structure allows for light absorption and exhibits high photocatalytic activity, but it traps slow photons within a narrow wavelength range. Therefore, the usable wavelengths are limited. To overcome this, a two-layer TiO2/BiVO4 inverse opal structure with different pore sizes was created to form two photonic band gaps, enabling the capture of slow photons. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

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This is an example of creating porous palladium using nanoparticles to detect hydrogen. In the future, hydrogen will be extremely important as an energy source for decarbonization. However, due to its high combustion heat and wide explosion limits, detection measures to prevent leaks are essential. We created a porous palladium structure using polystyrene nanoparticles of various sizes as a mold and investigated its properties. The sensitivity to hydrogen greatly depends on the periodicity of the pores, with larger pore diameters being more effective. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

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Our developed "Polystyrene Nanoparticles" achieve a uniform particle size without classification. They can easily create a regular array structure. Furthermore, they are characterized by a strong negative charge on the surface, making them difficult to aggregate in water. Since they are synthesized soap-free, there are no impurities such as surfactants. They are ideal not only for structural colors but also for nanosphere lithography and molds for three-dimensional porous bodies. Expected applications for three-dimensional porous bodies include electrodes for secondary batteries and capacitors, photocatalysts, dye-sensitized solar cells, photonic crystals, and sensors. For inquiries regarding nanoparticles, please feel free to consult us. 【Features】 ■ Spherical shape with a sharp particle size distribution ■ Lineup from 50 to 300 nm ■ Easy to arrange (negative charge: sulfonic acid group for employment) ■ Free of impurities (surfactant-free manufacturing) *For more details, please refer to the catalog or feel free to contact us.

• Other polymer materials

The advent of nanoscale materials has made it possible for materials science to connect directly with biology, optics, and other fields. Photonic crystals and structural colors found in birds and insects are good examples of this. Until now, we have dealt with various materials such as semiconductors, carbon materials, metals, oxides, and polymers. In addition to these, we hope to leverage our experience in synthesizing uniformly sized "polystyrene nanoparticles" to help solve your challenges and contribute to product development. For more details, please contact us via email.

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Using arranged polystyrene nanoparticles as a mold, after filling the spaces between the particles with another material and solidifying it, removing the microparticles through methods such as firing or dissolution results in a three-dimensional void structure that is inverted from the original colloidal crystal. This is referred to as "3 Dimensionally Ordered Macroporous" (3DOM) or "inverse opal structure." **Features** - Possesses a highly ordered porous structure in three dimensions - The size of the microparticles used as a mold allows for free control over the size of the voids - Various materials can be used for the void structure - High surface area per unit volume - Low transport resistance of substances due to high porosity For more details, please contact us or download the catalog.

• Other polymer materials