Synthesis of Zn-SBA-15 as a new pigment for spacecraft white thermal control coatings / Vahid Heydari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 4 (07/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 4 (07/2016) . - p. 727–733 Titre : Synthesis of Zn-SBA-15 as a new pigment for spacecraft white thermal control coatings Type de document : texte imprimé Auteurs : Vahid Heydari, Auteur ; Zaker Bahreini, Auteur ; Masoud Heidari, Auteur ; Alireza Sedrpoushan, Auteur Année de publication : 2016 Article en page(s) : p. 727–733 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Industries aérospatiales -- Matériaux Photométrie Pigments -- Synthèse Radiométrie Rayonnement solaire Revêtements:Peinture Santa Barbara Amorphous-15 Santa Barbara Amorphous-15 (SBA-15) is a highly stable mesoporous silica sieve developed by researchers at the University of California at Santa Barbara. It gets it high hydrothermal and mechanical stability from a framework of uniform hexagonal pores that feature a narrow pore-size distribution and a tunable pore diameter of 5nm to 15nm, but, most significantly, from its relatively thick walls, which range between 3.1nm and 6.4nm. SBA mesoporous silica 15 has a high internal surface area, which lends itself to various applications, including environmental adsorption and separation, advanced optics, and catalysts. (ACS Materials) Satellites artificiels Index. décimale : 667.9 Revêtements et enduits Résumé : Thermal control coatings (TCCs) help to maintain the thermal equilibrium of spacecraft at a level acceptable for vital components, usually around 20°C. This is done by either minimizing the solar absorbance or maximizing the thermal emittance. In the present study, with the aim of introducing new TCCs with enhanced optical properties, two TCCs were prepared by incorporating presynthesized pigments including SBA-15 (mesoporous material) and Zn-SBA-15 into potassium silicate binder. After application and drying, the TCC containing SBA-15 showed very low hiding power, so optical tests for this TCC were not done. The results of solar absorptance measurements revealed that the TCC containing Zn-SBA-15 was a proper reflector in the ultraviolet (UV) radiation range, making it much less susceptible to solar radiation in comparison with conventional TCCs. Also, thermal emittance tests demonstrated that the surface of this TCC had greater ability to emit heat. Furthermore, lower pigment-to-binder ratio and dry film thickness were attainable with this TCC, leading to weight reduction, improvement of mechanical properties, and lower porosity. Note de contenu : - MATERIALS AND METHODS : Materials - Equipment - Preparation of pigments - Preparation of paints - RESULTS AND DISCUSSION : X-ray diffraction - Scanning electron microscopy - Reflectometry DOI : 10.1007/s11998-015-9778-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9778-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26752 [article]

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