Synthesis, characterization and thermal performance of Fe/N co-doped MgTiO3 as a novel high near-infrared reflective pigment
Synthesis, characterization and thermal performance of Fe/N co-doped MgTiO3 as a novel high near-infrared reflective pigment
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DOI：
10.1016/j.solmat.2016.10.045
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发表时间：
2017-02
影响因子：
6.9
通讯作者：
Yang Rui;A. Han;M. Ye;Chen Xingxing;Yuan Lin
中科院分区：
文献类型：
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作者：
Yang Rui;A. Han;M. Ye;Chen Xingxing;Yuan Lin
为了获得具有高近红外反射率的无机无毒颜料冷材料，采用溶胶-凝胶法合成了Fe/N共掺杂MgTiO3（FNM）纳米粉体。由于点缺陷平衡理论，Fe/N 的替代将颜色从白色变为深红色，同时带隙从 2.11 ev 减小到 1.89 ev。氨解反应可以促进颗粒分散，增大颗粒尺寸。此外，FNM 颜料在 700–2500 nm 范围内表现出高近红外反射率 (>65%) 和近红外日光反射率 (>53.51%)。所制备的颜料（N掺杂Mg1−xFexTiO3+δ，x=0.3）与传统棕色颜料用作建筑屋顶材料后，涂层温差可分别达到2.4℃（基板内表面温度）和2.0℃（两个盒子内部温度）。此外，通过红外图像记录了涂层的表面温度分布，差值 (ΔT) 在 0–12 °C 范围内变化。按照涂料最大值（x=0.3）计算，节能年可减少二氧化碳排放1379.35吨、氮氧化物41.65吨、硫氧化物34.30吨。由于颜色范围广，化学稳定性好，满足太阳辐射能反射和冷却能需求，这些FNM材料被认为是新型彩色颜料。
To obtain cool materials as inorganic and nontoxic pigments with high near-infrared reflectance, nano-powder of Fe/N co-doped MgTiO3(FNM), were synthesized by the sol-gel method. The substitution of Fe/N changed the color from white to dark-red due to the point defect equilibrium theory, while the band gap decreased from 2.11 ev to 1.89 ev. Ammonolysis reaction can promote the particle dispersion and increase the particle size. Furthermore, the FNM pigments exhibit high NIR reflectance (>65%) and the NIR solar reflectance (>53.51%) in the range of 700–2500 nm. After the prepared pigments (N-doped Mg1−xFexTiO3+δ, x=0.3) and conventional brown pigments used as building roof materials, the temperature difference of coatings could reach 2.4 °C (the inner surface temperature of substrate plates) and 2.0 °C (the interior temperature of the two boxes), respectively. Moreover, the surface temperature distribution of the coatings was recorded by infrared images and the difference (ΔT) varied at 0–12 °C. According to the maximum value of coatings (x=0.3), energy savings would reduce annual emissions of 1379.35 t carbon dioxide, 41.65 t nitrogen oxides and 34.30 t sulfur oxides. Owing to the wide range of color and good chemical stability, which meets reflectance of solar radiation energy and cooling energy needs, these FNM materials are considered as novel color pigments.