کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6599026 | 1423883 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
One-step synthesis of near-infrared reflective brown pigments based on iron-doped lanthanum aluminate, LaAl1-xFexO3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The paper explores the perspective of using an urea and glycine fuel mixture in order to obtain brown, heat reflective iron-doped lanthanum aluminate LaAl1-xFexO3 (xâ¯=â¯0, 0.25, 0.5, 0.75) pigments, directly from the combustion reaction. The exothermic redox reactions were characterized by high combustion temperatures, ranging between 1712â¯Â°C (xâ¯=â¯0) and 1017â¯Â°C (xâ¯=â¯0.75), which facilitated the formation of perovskite solid solutions within a very short period of time, no further annealing needed. The crystallite size, specific surface area, colour and total solar reflectance of the pigments depend on the substitution degree of Al3+ by Fe3+. The increase of Fe3+ content resulted in lower combustion temperature, shorter reaction time and increased gases release rate, which are reflected in the linear decrease of crystallite size from 57â¯nm (xâ¯=â¯0) to 22â¯nm (xâ¯=â¯0.75), as well as the linear increase of specific surface area from 3.0 (xâ¯=â¯0) to 15.6â¯m2/g (xâ¯=â¯0.75). The brown hue was enhanced by the increase of the chromophore content. The total solar reflectance of the pigments decreased from 87.5% to 42.7% as the Fe3+ content, x, increased from 0 to 0.75. At the same time, the total solar reflectance values of the coatings prepared using the obtained pigments decreased from 85.3% to 35.8% as the Fe3+ content, x, increased from 0 to 0.75.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 152, May 2018, Pages 105-111
Journal: Dyes and Pigments - Volume 152, May 2018, Pages 105-111
نویسندگان
Robert IanoÅ, Eliza Muntean, Radu LazÄu, Roxana BÄbuÈÄ, Elena-Alina MoacÄ, Cornelia PÄcurariu, Anamaria Dabici, Iosif Hulka,