Keeping cool: Enhanced optical reflection and radiative heat dissipation in Saharan silver ants

• Autores: Norman Nan Shi, Chia-Cheng Tsai, Fernando Camino
• Localización: Science, ISSN 0036-8075, Vol. 349, Nº 6245, 2015, págs. 298-301
• Idioma: inglés
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• Resumen

  • Saharan silver ants, Cataglyphis bombycina, forage under extreme temperature conditions in the African desert. We show that the ants’ conspicuous silvery appearance is created by a dense array of triangular hairs with two thermoregulatory effects. They enhance not only the reflectivity of the ant’s body surface in the visible and near-infrared range of the spectrum, where solar radiation culminates, but also the emissivity of the ant in the mid-infrared. The latter effect enables the animals to efficiently dissipate heat back to the surroundings via blackbody radiation under full daylight conditions. This biological solution for a thermoregulatory problem may lead to the development of biomimetic coatings for passive radiative cooling of objects.