Programmable thermal emissivity structures based on bioinspired self-shape materials

Programmable thermal emissivity structures based on the bioinspired self-shape anisotropic materials were developed at macro-scale and further studied theoretically at smaller scale. We study a novel concept, incorporating materials that are capable of transforming their shape via microstructural re...

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Bibliographic Details
Published in:Scientific reports 2015-12, Vol.5 (1), p.17682-17682, Article 17682
Main Authors: Athanasopoulos, N., Siakavellas, N. J.
Format: Article
Language:English
Subjects:
639/166/984
639/301/1023/1025
639/301/54/989
Arrays
Emissivity
Genetic transformation
Geometry
Heat
Humanities and Social Sciences
Low temperature
Microelectromechanical systems
multidisciplinary
Radiation
Science
Self
Temperature effects
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Summary:Programmable thermal emissivity structures based on the bioinspired self-shape anisotropic materials were developed at macro-scale and further studied theoretically at smaller scale. We study a novel concept, incorporating materials that are capable of transforming their shape via microstructural rearrangements under temperature stimuli, while avoiding the use of exotic shape memory materials or complex micro-mechanisms. Thus, programmed thermal emissivity behaviour of a surface is achievable. The self-shape structure reacts according to the temperature of the surrounding environment or the radiative heat flux. A surface which incorporates self-shape structures can be designed to quickly absorb radiative heat energy at low temperature levels, but is simultaneously capable of passively controlling its maximum temperature in order to prevent overheating. It resembles a “game” of colours, where two or more materials coexist with different values of thermal emissivity/ absorptivity/ reflectivity. The transformation of the structure conceals or reveals one of the materials, creating a surface with programmable – and therefore, variable- effective thermal emissivity. Variable thermal emissivity surfaces may be developed with a total hemispherical emissivity ratio (εEff_H/εEff_L) equal to 28.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep17682