Research Papers

Optimum Multilayer-Graphene-Montmorillonite Composites From Sugar for Thermosolar Coatings Formulations

[+] Author and Article Information
Bàrbara Micó-Vicent

Colour and Vision Group,
University of Alicante,
Carretera de San Vicent,
Alacant 03690, Spain;
Departamento de Estadística e Investigación
Operativas Aplicadas y Calidad,
Universitat Politècnica de València (UPV),
Plaza Ferrandiz y Carbonell 1,
Alcoy 03801, Alicante, Spain
e-mail: barbara.mico@ua.es

María López

Abengoa Research,
Edificio Solandcenter,
Carretera A-472,
P.K. 5,85, Margen Derecha,
Sanlúcar la Mayor 41800, Seville, Spain
e-mail: maria.herraiz@abengoa.com

Azucena Bello

Abengoa Research,
Edificio Solandcenter,
Carretera A-472,
P.K. 5,85, Margen Derecha,
Sanlúcar la Mayor 41800, Seville, Spain
e-mail: bf.azucena@gmail.com

Noelia Martínez

Abengoa Research,
Universidad Rey Juan Carlos,
Paseo de la Castellana 43,
Madrid 28046, Spain
e-mail: noelia.martinez@abengoa.com

Francisco Martínez-Verdú

Colour and Vision Group,
University of Alicante,
Carretera de San Vicent, S/N,
Alicante 03690, Spain
e-mail: verdu@ua.es

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received September 27, 2016; final manuscript received January 9, 2017; published online February 8, 2017. Assoc. Editor: Wojciech Lipinski.

J. Sol. Energy Eng 139(3), 031005 (Feb 08, 2017) (7 pages) Paper No: SOL-16-1428; doi: 10.1115/1.4035757 History: Received September 27, 2016; Revised January 09, 2017

Solar thermal coatings are designed to achieve the highest incident solar flux into the receiver of a tower solar plant. These materials are subjected to extreme working conditions of temperature and solar concentrated radiation. Much effort is being made to develop a durable and high absorptive coating that can provide an excellent solar to heat conversion efficiency. Complex deposition techniques (PVD, CVD, electrodeposition, etc.) are developed and tested to achieve solar selectivity. High solar absorptance paints are an alternative technique, that is, easy to apply and implement in the field. In paint, pigments are the compound that provides high absorptance values, whose stability impacts the durability of optical properties. The search for new selective solar pigments for solar receivers is a promising route to improve the efficiency of this technology. In this work, novel nanocomposites were synthesized from low-cost organic materials such as table sugar. Promising results were obtained when intercalated and calcined in the laminar structure of montmorillonite, a type of smectite clay. The pigments were tested in a paint format on metallic coupons at different temperatures to obtain absorptivities above 96% of absorptance after 24 h at 700  °C. Further experiments are still needed to obtain optimum conditions to maximize the coating's absorptivity and durability at high temperature.

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Grahic Jump Location
Fig. 1

Initial coating samples prepared from the synthesized pigments

Grahic Jump Location
Fig. 2

Means plot for absorbance response (Abs%) with the sugar levels; (1) 2:1, (2) 1:1, and (3) 0.5:1 (left), and with the modifier levels: (1) CPB, (2) POSS, and (3) CPB and POSS together (right)

Grahic Jump Location
Fig. 3

Composite material designed as ideal black pigment production scheme with the selected raw materials

Grahic Jump Location
Fig. 4

Interactions plot for initial absorptivity response (left), after 24 h at 600 °C (center) and after 24 h at 700 °C (right). Sugar concentration ratios; (1) 2:1, (2) 1:1, and (3) 0.5:1. Modifier levels: (1) CPB, (2) POSS, and (3) CPB and POSS together.

Grahic Jump Location
Fig. 5

Interactions plot for adhesion response after 24 h at 600 °C (left) and after 24 h at 700 °C (right). Sugar levels; (1) 2:1, (2) 1:1, and (3) 0.5:1. Modifier levels: (1) CPB, (2) POSS, and (3) CPB and POSS together.

Grahic Jump Location
Fig. 6

TEM images for C1_6 (left) and C1_8 (right) samples

Grahic Jump Location
Fig. 7

X-ray diffraction pattern of GMC samples at different synthesis conditions and original montmorillonite (M), and calcined montmorillonite (M_T800)

Grahic Jump Location
Fig. 8

Raman shift for the same sugar–nanoclay content in the synthesis process MAz (1:1)




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