Hashimoto Hideki, Kiyohara Jun, Isozaki Arisa, Arakawa Yuya, Fujii Tatsuo, Takada Jun, Inada Hirofumi, Takaishi Taigo, Asoh Hidetaka
Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan.
Kyoto Municipal Institute of Industrial Technology and Culture, 91 Chudojiawatacho Kyoto, Shimogyo-ku, Kyoto 600-8815, Japan.
ACS Omega. 2020 Feb 21;5(8):4330-4337. doi: 10.1021/acsomega.9b04297. eCollection 2020 Mar 3.
Inspired by a bacteriogenic, iron-based oxide material and a traditional Japanese red pigment, a bright yellowish-red pigment was prepared by heating an Al-containing iron oxyhydroxide precursor. The obtained red pigment had a unique porous disk-like structure, comprising Al-substituted hematite particles and crystalline alumina nanoparticles. Although these disk-like structures loosely gathered to form an aggregate in powder, they can be easily dispersed into a single, disk-like structure by simple ultrasonic irradiation. The powder exhibited a bright yellowish-red color and high thermostability, making it attractive as a coloring material for various industrial products needing a bright-red color, high weather resistance, and durability. Quantitative color measurements revealed extremely high *, *, and * values that are much greater than those of commercially available hematite. The thermostability test showed that even after exposure to high temperatures, the pigment retained the red color, indicating its high thermostability. The unique microstructure should be strongly related to the bright yellowish-red color and the high thermostability of the developed red pigment.
受一种细菌源铁基氧化物材料和一种传统日本红色颜料的启发，通过加热含铝的羟基氧化铁前驱体制备了一种亮黄红色颜料。所获得的红色颜料具有独特的多孔盘状结构，由铝取代的赤铁矿颗粒和结晶氧化铝纳米颗粒组成。尽管这些盘状结构在粉末中松散聚集形成聚集体，但通过简单的超声辐照，它们可以很容易地分散成单个的盘状结构。该粉末呈现出亮黄红色且具有高热稳定性，使其作为一种用于需要亮红色、高耐候性和耐久性的各种工业产品的着色材料具有吸引力。定量颜色测量显示出极高的*、和值，远高于市售赤铁矿的相应值。热稳定性测试表明，即使在高温下暴露后，该颜料仍保留红色，表明其具有高热稳定性。独特的微观结构应该与所开发红色颜料的亮黄红色和高热稳定性密切相关。
