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Fukuji Suzuki

Bio: Fukuji Suzuki is an academic researcher. The author has contributed to research in topics: Titanium oxide & Layer (electronics). The author has an hindex of 3, co-authored 7 publications receiving 186 citations.

Papers
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Patent
07 Aug 2002
TL;DR: In this article, a titanium oxide composition having high brilliant color is prepared through firing the above composition comprising a coating layer and then delaminating the fired coating layer, as a delaminated composition.
Abstract: A composition which comprises a substrate of a thin plate form and a coating layer formed on the surface thereof, characterized in that the substrate of a thin plate form has a size of 50 to 800 μm, and the coating layer has a thickness of 0.05 to 0.6 μm and contains a titanium composition in an amount of 70 to 95 wt %. A titanium oxide composition having high brilliant color is prepared through firing the above composition comprising a coating layer and then delaminating the fired coating layer, as a delaminated composition. The titanium oxide composition is novel, and is capable of producing interference colors having excellent brightness and clearness and providing clear complementary colors and thus is useful particularly as a component of a cosmetic composition.

22 citations

Journal ArticleDOI
TL;DR: In this article, a high chroma pearlescent pigment for powder foundation has been developed, and the layer structure of the pigment has been designed using computer simulation. And the feature of this design is that iron oxide having selective light absorption has been adopted as the layer material to enhance certain wavelengths of the reflected light.
Abstract: Pearlescent pigments are one of the most essential materials not only in paints, plastics, and printing inks, but also in cosmetics. Pigments with higher chroma, color purity, and brightness are in high demand all over the world. In this study we developed a high chroma pearlescent pigment for powder foundation. To produce the high chroma pearlescent pigment, we have designed the layer structure of a pearlescent pigment using computer simulation. In the simulation we have considered its layer structure, the complex refractive indices of the layers, and the thickness distribution of a mica substrate that was measured with Atomic Force Microscopy (AFM). The layer thicknesses have been optimized. The feature of this design is that iron oxide having selective light absorption has been adopted as the layer material to enhance certain wavelengths of the reflected light, which is one of the properties of high chroma. Thus, we have found that a mica substrate homogeneously coated with iron oxide which is further coated with colorless titanium dioxide has a high chroma compared to ordinary pearlescent pigments. The designed pigment has been synthesized by developing a novel manufacturing method to achieve a low roughness iron-oxide surface. We believe that this simulation is useful for designing other pearlescent pigments.

14 citations

Patent
13 Nov 2006
TL;DR: In this article, a low-valent titanium oxide-based black pearlescent powder having excellent color, and a method for easily producing the black powder was proposed, which was obtained by covering the surface of a flaky powder with lowvalent Titanium oxide.
Abstract: PROBLEM TO BE SOLVED: To provide a low-valent titanium oxide-based black pearlescent powder having excellent color, and a method for easily producing the black powder. SOLUTION: The black pearlescent powder prepared by covering the surface of a flaky powder with low-valent titanium oxide is characterized in that the low-valence titanium oxide is substantially free of nitrogen, and is represented by TiO X (X is 1.56 to 1.75). COPYRIGHT: (C)2008,JPO&INPIT

2 citations

Patent
07 Dec 2011
TL;DR: The highly iridescent titanium oxide composition is a coating composition forming a coating layer over the surface of a thin flake-shaped matrix, whose size is 50-800 μm as mentioned in this paper.
Abstract: A highly iridescent titanium oxide composition, which not only produces new and outstanding luster as well as color brightness within a recognized color range by interference colors but also retains clear complementary colors. The highly iridescent titanium oxide composition is a coating composition forming a coating layer over the surface of a thin flake-shaped matrix, whose size is 50-800 μm. The coating layer is 0.05-0.6 μm thick containing a titanium composition whose content is 70-95% by mass. This titanium oxide-contained coating layer is the highly iridescent titanium oxide composition exfoliated from the coating composition. The highly iridescent titanium oxide composition is a beneficial element, especially as a cosmetic ingredient.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: itanium dioxide (TiO2) nanoparticles (NPs) are manufactured worldwide in large quantities for use in a wide range of applications and there is an enormous lack of epidemiological data regarding TiO2 NPs in spite of its increased production and use.
Abstract: Titanium dioxide (TiO2) nanoparticles (NPs) are manufactured worldwide in large quantities for use in a wide range of applications. TiO2 NPs possess different physicochemical properties compared to their fine particle (FP) analogs, which might alter their bioactivity. Most of the literature cited here has focused on the respiratory system, showing the importance of inhalation as the primary route for TiO2 NP exposure in the workplace. TiO2 NPs may translocate to systemic organs from the lung and gastrointestinal tract (GIT) although the rate of translocation appears low. There have also been studies focusing on other potential routes of human exposure. Oral exposure mainly occurs through food products containing TiO2 NP-additives. Most dermal exposure studies, whether in vivo or in vitro, report that TiO2 NPs do not penetrate the stratum corneum (SC). In the field of nanomedicine, intravenous injection can deliver TiO2 nanoparticulate carriers directly into the human body. Upon intravenous exposure, TiO2 NPs can induce pathological lesions of the liver, spleen, kidneys, and brain. We have also shown here that most of these effects may be due to the use of very high doses of TiO2 NPs. There is also an enormous lack of epidemiological data regarding TiO2 NPs in spite of its increased production and use. However, long-term inhalation studies in rats have reported lung tumors. This review summarizes the current knowledge on the toxicology of TiO2 NPs and points out areas where further information is needed.

1,202 citations

Journal ArticleDOI
TL;DR: Data indicate that mouse microglia respond to Degussa P25 with cellular and morphological expressions of free radical formation, indicating that nanosize TiO2 could pose a risk to biological targets that are sensitive to oxidative stress damage.
Abstract: Concerns with the environmental and health risk of widely distributed, commonly used nanoparticles are increasing. Nanosize titanium dioxide (TiO2) is used in air and water remediation and in numerous products designed for direct human use and consumption. Its effectiveness in deactivating pollutants and killing microorganisms relates to photoactivation and the resulting free radical activity. This property, coupled with its multiple potential exposure routes, indicates that nanosize TiO2 could pose a risk to biological targets that are sensitive to oxidative stress damage (e.g., brain). In this study, brain microglia (BV2) were exposed to a physicochemically characterized (i.e., dispersion stability, particle size distribution, and zeta potential) nanomaterial, Degussa P25, and cellular expressions of reactive oxygen species were measured with fluorescent probes. P25's zeta potentials, measured in cell culture media and physiological buffer were -11.6 +/- 1.2 mV and -9.25 +/- 0.73 mV, respectively. P25 aggregation was rapid in both media and buffer with the hydrodynamic diameter of stable P25 aggregates ranging from 826 nm to 2368 nm depending on the concentration. The biological response of BV2 microglia to noncytotoxic (2.5-120 ppm) concentrations of P25 was a rapid (<5 min) and sustained (120 min) release of reactive oxygen species. The time course of this release suggested that P25 not only stimulated the immediate "oxidative burst" response in microglia but also interfered with mitochondrial energy production. Transmission electron microscopy indicated that small groups of nanosized particles and micron-sized aggregates were engulfed bythe microglia and sequestered as intracytoplasmic aggregates after 6 and 18 h exposure to P25 (2.5 ppm). Cell viability was maintained at all test concentrations (2.5-120 ppm) over the 18 h exposure period. These data indicate that mouse microglia respond to Degussa P25 with cellular and morphological expressions of free radical formation.

833 citations

Journal ArticleDOI
TL;DR: The evolution of nano-TiO2 production as a percentage of the total TiO2 market is projected based on material and market information along with a method that combines observations from scientific articles and patents as predictive indicators of the rate of innovative transformation.
Abstract: An upper bound is estimated for the magnitude of potential exposure to nano-TiO2 with the purpose of enabling exposure assessment and, ultimately, risk assessment. Knowledge of the existing bulk TiO2 market is combined with available nano-TiO2 production data to estimate current nano-TiO2 sources as a baseline. The evolution of nano-TiO2 production as a percentage of the total TiO2 market is then projected based on material and market information along with a method that combines observations from scientific articles and patents as predictive indicators of the rate of innovative transformation.

569 citations

Journal ArticleDOI
TL;DR: Long-term exposure of aquatic organisms to nTiO(2) may alter the growing status of these organisms at both individual and population levels, posing risks to aquatic ecosystems.

491 citations

Journal ArticleDOI
TL;DR: It is indicated that P25 stimulates ROS in BV2 microglia and is nontoxic to isolated N27 neurons, however, P25 rapidly damages neurons at low concentrations in complex brain cultures, plausibly though microglial generated ROS.
Abstract: BackgroundTitanium dioxide is a widely used nanomaterial whose photo-reactivity suggests that it could damage biological targets (e.g., brain) through oxidative stress (OS).ObjectivesBrain cultures...

426 citations