Aerosol Synthesis and Optical Characterization of Co-Doped MgTiO3 Blue Pigments with High NIR Reflectance

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-05-21 DOI:10.1021/acs.inorgchem.5c0077210.1021/acs.inorgchem.5c00772

Jinhee Yun, Dea Hoon Jeong and Kyeong Youl Jung*,

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Abstract

Near-infrared (NIR) reflective pigments are considered as energy-efficient cooling materials to mitigate the urban heat island (UHI) effect and reduce energy consumption. In this study, a novel blue pigment based on Mg_1–xCo_xTiO₃ with high NIR reflectance was synthesized by spray pyrolysis, and its crystallographic and optical properties were investigated by varying the Co content and the calcination temperature. X-ray diffractometer (XRD) and TEM analyses revealed that the prepared Mg_1–xCo_xTiO₃ pigments possessed an impurity-free ilmenite crystal structure and a dense spherical shape with a uniform distribution of Co. The intense blue color is due to the ⁴T_1g (F) → ⁴T_1g (P) transition of Co²⁺ in the octahedral ligand field. The optimal Co content and calcination temperature for obtaining the highest NIR reflectance with excellent blue characteristics were determined to be 20% (x = 0.2) and 800 °C, respectively. As a result, the Mg_0.8Co_0.2TiO₃ blue pigment (L* = 59.8, a* = −1.23, b* = −36.8) shows a high NIR solar reflectance of 78.9%, which is 34% higher than that of CoAl₂O₄. The color difference (ΔE*) values before and after immersed in acid/alkaline solution are less than 1.0, indicating that Mg_0.8Co_0.2TiO₃ exhibits excellent chemical stability. The temperature rise test under NIR irradiation demonstrated that the synthesized Mg_0.8Co_0.2TiO₃ blue pigment exhibited improved heat shielding performance compared to that of CoAl₂O₄. Therefore, Mg_0.8Co_0.2TiO₃ could be used as a promising cool blue pigment for sustainable solutions to alleviate heat accumulation due to sunlight.

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高近红外反射率共掺杂MgTiO3蓝色颜料的气溶胶合成及光学表征

近红外（NIR）反射颜料被认为是一种节能的冷却材料，可以缓解城市热岛效应，降低能源消耗。本文采用喷雾热解法合成了一种新型的具有高近红外反射率的Mg1-xCoxTiO3蓝色颜料，并通过改变Co含量和煅烧温度对其晶体学和光学性能进行了研究。x射线衍射仪（XRD）和透射电镜（TEM）分析表明，制备的Mg1-xCoxTiO3颜料具有不含杂质的钛铁矿晶体结构和致密的球形结构，Co分布均匀。由于Co2+在八面体配体场中发生4T1g (F)→4T1g (P)转变而呈现出浓烈的蓝色。获得最佳近红外反射率的最佳Co含量为20% (x = 0.2)，最佳焙烧温度为800℃。结果表明，Mg0.8Co0.2TiO3蓝颜料（L* = 59.8, a* = - 1.23, b* = - 36.8）的近红外太阳反射率高达78.9%，比CoAl2O4高出34%。在酸/碱溶液中浸泡前后的色差（ΔE*）值均小于1.0，说明Mg0.8Co0.2TiO3具有优异的化学稳定性。近红外辐射下的温升测试表明，合成的Mg0.8Co0.2TiO3蓝色颜料与CoAl2O4相比，具有更好的热屏蔽性能。因此，Mg0.8Co0.2TiO3可以作为一种有前途的冷蓝色颜料，用于可持续解决方案，以减轻阳光引起的热量积累。

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来源期刊

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.