{"id":94028,"date":"2013-01-18T13:03:11","date_gmt":"2013-01-18T15:03:11","guid":{"rendered":"http:\/\/revistapesquisa.fapesp.br\/?p=94028"},"modified":"2013-01-18T13:03:11","modified_gmt":"2013-01-18T15:03:11","slug":"ask-the-researchers-10","status":"publish","type":"post","link":"https:\/\/revistapesquisa.fapesp.br\/en\/ask-the-researchers-10\/","title":{"rendered":"Ask the researchers"},"content":{"rendered":"

\"\"lo.tangelini \/ Creative Commons<\/span><\/strong>What differentiates the colors is the wavelength of the light, which in the visible spectrum of the human eye varies between 400 nanometers (blue\/violet) and 700 nanometers (dark red).\u00a0 One nanometer corresponds to one millionth of a millimeter.\u00a0 Objects like drops of steam or soap bubbles that measure a fraction of 1 millimeter spread the light that falls on them.\u00a0 That is why clouds in the sky and the foam on beer are white.\u00a0 Structures that are much smaller than the wavelength of visible light, measuring 1 nanometer or less, such as simple molecules, spread very little light.\u00a0 They can also absorb light:\u00a0 beer is yellow although its foam is white because the molecules that the beer consists of take away the other colors and allow the center of the spectrum, the yellow, to pass through.\u00a0 On the scale comparable to wavelength, the particles cause interference with the light if they are arranged in an organized, regular pattern, like the slats of\u00a0 window blinds, for example.\u00a0 This effect gives rise to the multicolored appearance of the recorded side of a CD, whose grooves are this size, and the iridescence of butterfly wings or peacock feathers that are covered by nanometer-sized fibers separated by spaces of similar dimension.\u00a0 This arrangement is essential so that nanostructures are able to cause interference with light.<\/p>\n

Specialist consulted
\nLuiz Nunes de Oliveira<\/strong>, S\u00e3o Carlos Institute of Physics, USP<\/p>\n

Send your questions to wikirevistapesquisa@fapesp.br<\/a>, via Facebook or to Twitter @PesquisaFapesp<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"Do nanometric scale structures cause the perception of color?","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[170],"tags":[],"coauthors":[93],"class_list":["post-94028","post","type-post","status-publish","format-standard","hentry","category-wiki-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/94028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/comments?post=94028"}],"version-history":[{"count":0,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/94028\/revisions"}],"wp:attachment":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media?parent=94028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/categories?post=94028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/tags?post=94028"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/coauthors?post=94028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}