Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings
Developing strategies for the green synthesis of novel materials, such as pigments for protection from solar radiation, is a fundamental research subject in material science to mitigate the heat island effect. Within this perspective, the current study reports on the synthesis of blue pigments of Zn...
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MDPI AG
2023-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/4/1696 |
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| author | Julia de Oliveira Primo Dienifer F. L. Horsth Nayara Balaba Polona Umek Fauze J. Anaissi Carla Bittencourt |
| author_facet | Julia de Oliveira Primo Dienifer F. L. Horsth Nayara Balaba Polona Umek Fauze J. Anaissi Carla Bittencourt |
| author_sort | Julia de Oliveira Primo |
| collection | DOAJ |
| description | Developing strategies for the green synthesis of novel materials, such as pigments for protection from solar radiation, is a fundamental research subject in material science to mitigate the heat island effect. Within this perspective, the current study reports on the synthesis of blue pigments of ZnAl<sub>2</sub>O<sub>4</sub>:M (M = Co<sup>2+</sup> and Co<sup>2+</sup>/Nd<sup>3+</sup>) using recycled metallic aluminum (discarded can seal) with reflective properties of Near-infrared radiation. The pigments were characterized by XRD, SEM, XPS, UV-Vis, NIR diffuse reflectance spectroscopy, and CIE-1976 L*a*b* color measurements. The wettability of the coatings containing the synthesized pigments was also evaluated. The structural characterization showed that the pigments present the Gahnite crystalline phase. Colorimetric measurements obtained by the CIEL*a*b* method show values correlated to blue pigments attributed to Co<sup>2+</sup> ions in tetrahedral sites. The pigments exhibit high near-infrared solar reflectance (with R% ≥ 60%), with an enhancement of nearly 20% for the pigment-containing neodymium when applied in white paint, indicating that the prepared compounds have the potential to be energy-saving color pigments for coatings. |
| first_indexed | 2024-03-11T08:29:34Z |
| format | Article |
| id | doaj.art-973621b7b2644f7c972c1589add12498 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T08:29:34Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-973621b7b2644f7c972c1589add124982023-11-16T21:53:16ZengMDPI AGMaterials1996-19442023-02-01164169610.3390/ma16041696Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool CoatingsJulia de Oliveira Primo0Dienifer F. L. Horsth1Nayara Balaba2Polona Umek3Fauze J. Anaissi4Carla Bittencourt5Chemistry Department, Universidade Estadual do Centro-Oeste, Guarapuava 85040-200, BrazilChemistry Department, Universidade Estadual do Centro-Oeste, Guarapuava 85040-200, BrazilChemistry Department, Universidade Estadual do Centro-Oeste, Guarapuava 85040-200, BrazilSolid State Physics Department, Jožef Stefan Institute, 1000 Ljubljana, SloveniaChemistry Department, Universidade Estadual do Centro-Oeste, Guarapuava 85040-200, BrazilChimie des Interactions Plasma-Surface (ChIPS), Research Institute for Materials Science and Engineering, University of Mons, 7000 Mons, BelgiumDeveloping strategies for the green synthesis of novel materials, such as pigments for protection from solar radiation, is a fundamental research subject in material science to mitigate the heat island effect. Within this perspective, the current study reports on the synthesis of blue pigments of ZnAl<sub>2</sub>O<sub>4</sub>:M (M = Co<sup>2+</sup> and Co<sup>2+</sup>/Nd<sup>3+</sup>) using recycled metallic aluminum (discarded can seal) with reflective properties of Near-infrared radiation. The pigments were characterized by XRD, SEM, XPS, UV-Vis, NIR diffuse reflectance spectroscopy, and CIE-1976 L*a*b* color measurements. The wettability of the coatings containing the synthesized pigments was also evaluated. The structural characterization showed that the pigments present the Gahnite crystalline phase. Colorimetric measurements obtained by the CIEL*a*b* method show values correlated to blue pigments attributed to Co<sup>2+</sup> ions in tetrahedral sites. The pigments exhibit high near-infrared solar reflectance (with R% ≥ 60%), with an enhancement of nearly 20% for the pigment-containing neodymium when applied in white paint, indicating that the prepared compounds have the potential to be energy-saving color pigments for coatings.https://www.mdpi.com/1996-1944/16/4/1696recycled metallic aluminumnear-infrared reflectioncircular economyneodymiumcobalt |
| spellingShingle | Julia de Oliveira Primo Dienifer F. L. Horsth Nayara Balaba Polona Umek Fauze J. Anaissi Carla Bittencourt Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings Materials recycled metallic aluminum near-infrared reflection circular economy neodymium cobalt |
| title | Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings |
| title_full | Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings |
| title_fullStr | Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings |
| title_full_unstemmed | Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings |
| title_short | Synthesis of Blue Gahnite (ZnAl<sub>2</sub>O<sub>4</sub>:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings |
| title_sort | synthesis of blue gahnite znal sub 2 sub o sub 4 sub co nd a cost effective method for producing solar reflective pigments for cool coatings |
| topic | recycled metallic aluminum near-infrared reflection circular economy neodymium cobalt |
| url | https://www.mdpi.com/1996-1944/16/4/1696 |
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