Creation of non-chromium composite compounds with excellent heat shielding properties

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15326
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: Kurume National College of Technology
• Principal Investigator: Obukuro Yuki 久留米工業高等専門学校, 材料システム工学科, 助教 (80804004)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 鉄系複合酸化物 / 顔料 / 遮熱 / 多核金属錯体 / 異種元素添加 / 近赤外線反射

Outline of Final Research Achievements

Iron-based complex oxide is expected as a near-infrared (NIR) reflective pigment. In order to improve the NIR reflectivity of pigments, it is necessary to control the chromogenic properties of oxides and prepare pigment particles with a well-formed particle size. Samples containing various third component elements were prepared and their particle size, morphology, color, and NIR reflection characteristics were evaluated. It was clarified that the addition of La suppressed crystallite growth of ZnFe2O4 and the micronization enhances its NIR reflection characteristics. TEM observations suggest that the added La exists at the interface of ZnFe2O4 particles and suppresses crystallite growth, affecting the microstructure of the particles and the light reflection properties on the particle surface.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

ヒートアイランド現象の緩和のため、近赤外線反射性能の優れた遮熱材料の開発が求められている。本研究では、資源量が豊富で環境負荷の小さい鉄系複合酸化物を母材として活用し、ありふれた元素の組み合わせで、顔料の光学的挙動や粒子形態の制御を目指している点に社会的意義がある。また、異種元素の添加効果の解明は材料科学の観点から非常に重要であり、学術的にも意義がある。