Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3
The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science...
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Faculty of Science, Chiang Mai University
2020
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th-cmuir.6653943832-698842020-10-08T08:36:16Z Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 Nuchjarin Sangwong Mantana Suwan Sitthisuntorn Supothina cobalt ferrite NIR-reflective pigment cool pigment black pigment solid-state reaction The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so. Near-infrared (NIR) reflectance of cobalt ferrite (CoFe2O4) black pigment has been significantly enhanced by doping with Al2O3, MgO and CaO&MgO derived from dolomite. The CoFe2O4 pigment was synthesized by a conventional solid-state reaction of Co3O4 and Fe2O3 at 1100 oC. Various amounts of dopants including Al2O3, MgO and dolomite which yielded MgO&CaO upon calcination were added into starting raw materials to investigate doping effect. Substitutions of Al3+ for Fe3+, and Mg2+ and/or Ca2+ for Co2+ in the CoFe2O4 structure were manipulated to find an optimum condition that yielded high NIR reflectivity while its black color hue was maintained. Crystal structure, particle morphology and properties of the synthesized pigments were characterized by an XRD, SEM, UV-Vis-NIR spectrophotometer and CIE 1976 L*a*b* colorimetric method. The pure CoFe2O4 black pigment exhibited color lightness L* and NIR reflectance of 19.59 and 19.5%, respectively. The incorporation of the MgO and Al2O3 dopants resulted in a significant increase of the NIR reflectance to 47.6%. Similarly, a significantly enhanced NIR reflectance of 39.8% was obtained at the optimum doping content of Al2O3 and MgO&CaO derived from dolomite. The synthesized pigments exhibited high NIR reflectance that was comparable to the commercial reflective black pigments. Doping the CoFe2O4 with an inexpensive dolomite mineral not only enhanced its NIR reflectance but would also reduce the synthesis cost. 2020-10-08T08:36:16Z 2020-10-08T08:36:16Z 2020 Chiang Mai Journal of Science 47,4 (Special Issue II : July 2020), p.686-699 2465-3845 https://epg.science.cmu.ac.th/ejournal/dl.php?journal_id=11098 http://cmuir.cmu.ac.th/jspui/handle/6653943832/69884 Eng Faculty of Science, Chiang Mai University |
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cobalt ferrite NIR-reflective pigment cool pigment black pigment solid-state reaction Nuchjarin Sangwong Mantana Suwan Sitthisuntorn Supothina Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 |
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The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so. |
author |
Nuchjarin Sangwong Mantana Suwan Sitthisuntorn Supothina |
author_facet |
Nuchjarin Sangwong Mantana Suwan Sitthisuntorn Supothina |
author_sort |
Nuchjarin Sangwong |
title |
Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 |
title_short |
Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 |
title_full |
Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 |
title_fullStr |
Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 |
title_full_unstemmed |
Synthesis and Optical Band Gap Study of NIR-Reflective CoFe2O4 Black Pigments Doped with MgO, CaO and Al2O3 |
title_sort |
synthesis and optical band gap study of nir-reflective cofe2o4 black pigments doped with mgo, cao and al2o3 |
publisher |
Faculty of Science, Chiang Mai University |
publishDate |
2020 |
url |
https://epg.science.cmu.ac.th/ejournal/dl.php?journal_id=11098 http://cmuir.cmu.ac.th/jspui/handle/6653943832/69884 |
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1681752801439383552 |