{"id":6108,"date":"2015-09-06T05:51:23","date_gmt":"2015-09-06T05:51:23","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=6108"},"modified":"2015-09-06T05:51:23","modified_gmt":"2015-09-06T05:51:23","slug":"metallic-gels-produce-tunable-light-emission","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/metallic-gels-produce-tunable-light-emission\/","title":{"rendered":"Metallic gels produce tunable light emission"},"content":{"rendered":"

New family of luminescent materials could find broad uses in chemical and biological detectors<\/strong><\/em><\/span><\/p>\n

\"Luminescent<\/a>
Luminescent materials produced by the MIT team are shown under ultraviolet light, emitting different colors of light that can be modified by their environmental conditions. These light-emitting beads were made by materials science and engineering students Caroline Liu and Rebecca Gallivan.
Photo: Tara Fadenrecht<\/figcaption><\/figure>\n

CAMBRIDGE, Mass.<\/strong>–Researchers at MIT have developed a family of materials that can emit light of precisely controlled colors \u2014 even pure white light \u2014 and whose output can be tuned to respond to a wide variety of external conditions. The materials could find a variety of uses in detecting chemical and biological compounds, or mechanical and thermal conditions.<\/span><\/p>\n

\n

[pullquote]Holten-Andersen\u2019s own research has examined a particular kind of crosslinking in the threads mussels use to anchor themselves to rocks, called metal-coordination bonds.[\/pullquote]<\/p>\n

The material, a metallic polymer gel made using rare-earth elements, is described in a paper in the\u00a0Journal of the American Chemical Society<\/em>by assistant professor of materials science and engineering Niels Holten-Andersen, postdoc Pangkuan Chen, and graduate students Qiaochu Li and Scott Grindy.<\/span><\/p>\n

The material, a light-emitting lanthanide metallogel, can be chemically tuned to emit light in response to chemical, mechanical, or thermal stimuli \u2014 potentially providing a visible output to indicate the presence of a particular substance or condition.<\/span><\/p>\n

The new material is an example of work with biologically inspired materials, Holten-Andersen explains. \u201cMy niche is biomimetics \u2014 using nature\u2019s tricks to design bio-inspired polymers,\u201d he says. There are an amazing variety of \u201creally funky\u201d organisms in the oceans, he says, adding: \u201cWe\u2019ve barely scratched the surface of trying to understand how they\u2019re put together, from a chemical and mechanical standpoint.\u201d<\/span><\/p>\n

Studying such natural materials, evolved over millions of years to adapt to challenging environmental conditions, \u201callows us as engineers to derive design principles\u201d that can be applied to other kinds of materials, he adds.<\/span><\/p>\n

Holten-Andersen\u2019s own research has examined a particular kind of crosslinking in the threads mussels use to anchor themselves to rocks, called metal-coordination bonds. These bonds, he adds, also play an important role in many biological functions, such as binding oxygen to hemoglobin in red blood cells.<\/span><\/p>\n

He emphasizes that the idea is not to copy nature, but to understand and apply some of the underlying principles of natural materials; in some cases, these principles can be applied in materials that are simpler in structure and easier to produce than their natural counterparts.<\/span><\/p>\n

In this case, the use of a metal from the lanthanide group, also known as rare-earth elements, combined with a widely used polymer called polyethylene glycol, or PEG, results in a material that produces tunable, multicolored light emissions. The light emission can then reflect very subtle changes in the environment, providing a color-coded output that reveals details of those conditions.<\/span><\/p>\n

\u201cIt\u2019s super-sensitive to external parameters,\u201d Holten-Andersen says. \u201cWhatever you do will change the bond dynamics, which will change the color.\u201d<\/span><\/p>\n

So, for example, the materials could be engineered to detect specific pollutants, toxins, or pathogens, with the results instantly visible just through color emission.<\/span><\/p>\n

The materials can also detect mechanical changes, and could be used to detect stresses in mechanical systems, Holten-Andersen says. For example, it\u2019s difficult to measure forces in fluids, he says, but this approach could provide a sensitive means of doing so.<\/span><\/p>\n

The material can be made in a gel, a thin film, or a coating that could be applied to structures, potentially indicating the development of a failure before it happens.<\/span><\/p>\n

Metal-coordination bonds in polymers have been the subject of other work by Holten-Andersen: In a separate paper he published Aug. 31 in the journal Nature Materials, he reported making polymers with tunable mechanical properties, including stiffness. These materials are naturally self-assembling and self-healing, he says, and could be useful as energy-absorbing materials or in biological implants that need to be able to absorb impacts without breaking, he says.<\/span><\/p>\n

This work was supported by the MIT Energy Initiative and the MIT Sea Grant via the Doherty Professorship in Ocean Utilization.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Researchers at MIT have developed a family of materials that can emit light of precisely controlled colors \u2014 even pure white light \u2014 and whose output can be tuned to respond to a wide variety of external conditions. <\/p>\n","protected":false},"author":6,"featured_media":6109,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-6108","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",600,400,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",600,400,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",540,360,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",95,63,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",639,426,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",96,64,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/09\/MIT-Luminescent-1_0.jpg",150,100,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/6108","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=6108"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/6108\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/6109"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=6108"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=6108"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=6108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}