Materiais de alta absorção óptica são importantes em diversas áreas, incluindo as células solares. [Imagem: Jianfeng Huang et al. – 10.1038/nnano.2015.228]
Do muito branco ao muito preto
Uma equipe da Universidade Rei Abdulla, na Arábia Saudita, desenvolveu o material mais preto já criado pelo homem.
Curiosamente, eles foram buscar inspiração em um besouro quase perfeitamente branco – tanto que ele já inspirou a criação de papéis e tintas mais brancos.
Os pesquisadores observaram que as escamas do besouroCyphochilus formam um cristal fotônico, uma estrutura que reflete a luz de forma muito eficiente. Eles então inverteram a estrutura e usaram a ideia de captação de energia caótica para criar um material extremamente preto.
Para inverter o que acontece na carapaça do besouro, Jianfeng Huang e seus colegas usaram nanotubos de carbono. O elemento básico do material é uma partícula formada por um nanotubo apoiado em uma esfera de apenas 30 nanômetros de diâmetro.
Preto quase perfeito
O material resultante absorve entre 98 e 99% de toda a luz incidente na faixa de comprimentos de onda de 400 a 1.400 nanômetros – o olho humano consegue captar a luz entre 390 e 700 nanômetros.
Para comparação, isto significa que o novo material absorve 26% mais luz do que qualquer outro material conhecido.
O que é mais interessante para aplicações práticas é que essa absorção funciona para todos os ângulos de incidência e para qualquer polarização da luz.
Preto perfeito
A equipe destaca que, embora seja impossível criar um preto perfeito, capaz de absorver toda a energia que incidir sobre ele, passos nesse sentido são importantes porque esses materiais podem ajudar na criação de dispositivos melhores ou mais eficientes, de coletores solares a interconexões ópticas. (Inovação Tecnológica)
Bibliografia:
Harnessing structural darkness in the visible and infrared wavelengths for a new source of light
Jianfeng Huang, Changxu Liu, Yihan Zhu, Silvia Masala, Erkki Alarousu, Yu Han, Andrea Fratalocchi
Nature Nanotechnology
Vol.: Published online
DOI: 10.1038/nnano.2015.228
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