{"id":4968,"date":"2022-10-03T19:07:00","date_gmt":"2022-10-03T19:07:00","guid":{"rendered":"https:\/\/new.www.purdue.edu\/newsroom\/?p=4968"},"modified":"2024-07-10T19:12:49","modified_gmt":"2024-07-10T19:12:49","slug":"worlds-whitest-paint-now-thinner-than-ever-ideal-for-vehicles","status":"publish","type":"post","link":"https:\/\/www.purdue.edu\/newsroom\/2022\/Q4\/worlds-whitest-paint-now-thinner-than-ever-ideal-for-vehicles","title":{"rendered":"World\u2019s whitest paint now thinner than ever, ideal for vehicles"},"content":{"rendered":"

WEST LAFAYETTE, Ind. —<\/p> \n

The world\u2019s whitest paint \u2013 seen in this year\u2019s edition of Guinness World Records<\/em><\/a> and \u201cThe Late Show With Stephen Colbert\u201d<\/a> \u2013 keeps surfaces so cool that it could reduce the need for air conditioning. Now the Purdue University researchers who created the paint have developed a new formulation that is thinner and lighter \u2013 ideal for radiating heat away from cars, trains and airplanes.<\/p>\n<\/div>\n\n\n

\u201cI\u2019ve been contacted by everyone from spacecraft manufacturers to architects to companies that make clothes and shoes,\u201d said Xiulin Ruan<\/a>, a Purdue professor of mechanical engineering<\/a> and developer of the paint. \u201cThey mostly had two questions: Where can I buy it, and can you make it thinner?\u201d<\/p>\n\n\n\n

The original world\u2019s whitest paint<\/a> used nanoparticles of barium sulfate to reflect 98.1% of sunlight, cooling outdoor surfaces more than 4.5\u00b0C below ambient temperature. Cover your roof in that paint, and you could essentially cool your home with much less air conditioning. But there\u2019s a problem.<\/p>\n\n\n\n

\u201cTo achieve this level of radiative cooling below the ambient temperature, we had to apply a layer of paint at least 400 microns thick,\u201d Ruan said. \u201cThat\u2019s fine if you\u2019re painting a robust stationary structure, like the roof of a building. But in applications that have precise size and weight requirements, the paint needs to be thinner and lighter.\u201d<\/p>\n\n\n\n

\"A
Purdue University researchers have created a new formula for the world’s whitest paint, making it thinner and lighter. The previous iteration (left) required a layer 0.4 millimeters thick to achieve sub-ambient radiant cooling. The new formulation can achieve similar cooling with a layer just 0.15 millimeters thick. This is thin and light enough for its radiant cooling effects to be applied to vehicles like cars, trains and airplanes. (Purdue University photo\/Andrea Felicelli)<\/figcaption><\/figure>\n\n\n\n

That\u2019s why Ruan\u2019s team began experimenting with other materials, pushing the limit of materials\u2019 capability to scatter sunlight. Their latest formulation is a nanoporous paint incorporating hexagonal boron nitride as the pigment, a substance mostly used in lubricants. This new paint achieves nearly the same benchmark of solar reflectance (97.9%) with just a single 150-micron layer of paint.<\/p>\n\n\n\n

Their research has been published in Cell Reports Physical Science<\/a>.<\/p>\n\n\n\n

\u201cHexagonal boron nitride has a high refractive index, which leads to strong scattering of sunlight,\u201d said Andrea Felicelli, a Purdue PhD student in mechanical engineering who worked on the project. \u201cThe particles of this material also have a unique morphology, which we call nanoplatelets.\u201d<\/p>\n\n\n\n

Ioanna Katsamba, another PhD student in mechanical engineering at Purdue, ran computer simulations to understand if the nanoplatelet morphology offers any benefits. \u201cThe models showed us that the nanoplatelets are more effective in bouncing back the solar radiation than spherical nanoparticles used in previous cooling paints,\u201d Katsamba said.<\/p>\n\n\n\n

The paint also incorporates voids of air, which make it highly porous on a nanoscale. This lower density, together with the thinness, provides another huge benefit: reduced weight. The newer paint weighs 80% less than barium sulfate paint yet achieves nearly identical solar reflectance.<\/p>\n\n\n\n

\u201cThis light weight opens the doors to all kinds of applications,\u201d said George Chiu<\/a>, a Purdue professor of mechanical engineering and an expert in inkjet printing. \u201cNow this paint has the potential to cool the exteriors of airplanes, cars or trains. An airplane sitting on the tarmac on a hot summer day won\u2019t have to run its air conditioning as hard to cool the inside, saving large amounts of energy. Spacecraft also have to be as light as possible, and this paint can be a part of that.\u201d<\/p>\n\n\n\n

As to that other big question \u2013 where can I buy the paint? \u2013 Ruan explains. \u201cWe are in discussions right now to commercialize it,\u201d he said. \u201cThere are still a few issues that need to be addressed, but progress is being made.\u201d<\/p>\n\n\n\n

Either way, these Purdue researchers look forward to what the paint could accomplish. \u201cUsing this paint will help cool surfaces and greatly reduce the need for air conditioning,\u201d Ruan said. \u201cThis not only saves money, but it reduces energy usage, which in turn reduces greenhouse gas emissions. And unlike other cooling methods, this paint radiates all the heat into deep space, which also directly cools down our planet. It\u2019s pretty amazing that a paint can do all that.\u201d<\/p>\n\n\n\n

Patent applications for this paint formulation have been filed through the Purdue Research Foundation Office of Technology Commercialization<\/a>. For further discussion on this intellectual property, contact whitepaint@prf.org<\/a> and reference code 2022-RUAN-69542<\/a><\/strong>. This research was supported by the National Science Foundation with Award No. 2102645, and Andrea Felicelli was supported by a National Science Foundation Graduate Research Fellowship. The research was performed at Purdue\u2019s FLEX Lab<\/a> and Ray W. Herrick Laboratories<\/a> and the Birck Nanotechnology Center<\/a> of Discovery Park District at Purdue<\/a>.<\/p>\n\n\n\n

About Purdue University\u00a0<\/h2>\n\n\n\n

Purdue University is a top public research institution developing practical solutions to today\u2019s toughest challenges. Ranked in each of the last five years as one of the 10 Most Innovative universities in the United States by U.S. News & World Report, Purdue delivers world-changing research and out-of-this-world discovery. Committed to hands-on and online, real-world learning, Purdue offers a transformative education to all. Committed to affordability and accessibility, Purdue has frozen tuition and most fees at 2012-13 levels, enabling more students than ever to graduate debt-free. See how Purdue never stops in the persistent pursuit of the next giant leap at https:\/\/stories.purdue.edu<\/a>.<\/p>\n\n\n\n

About Purdue Research Foundation Office of Technology Commercialization<\/h2>\n\n\n\n

The Purdue Research Foundation Office of Technology Commercialization operates one of the most comprehensive technology transfer programs among leading research universities in the U.S. Services provided by this office support the economic development initiatives of Purdue University and benefit the university\u2019s academic activities through commercializing, licensing and protecting Purdue intellectual property. The office is housed in the Convergence Center for Innovation and Collaboration in Discovery Park District at Purdue, adjacent to the Purdue campus. In fiscal year 2021, the office reported 159 deals finalized with 236 technologies signed, 394 disclosures received and 187 issued U.S. patents. The office is managed by the Purdue Research Foundation, which received the 2019 Innovation and Economic Prosperity Universities Award for Place from the Association of Public and Land-grant Universities. In 2020, IPWatchdog Institute ranked Purdue third nationally in startup creation and in the top 20 for patents. The Purdue Research Foundation is a private, nonprofit foundation created to advance the mission of Purdue University. Contact otcip@prf.org<\/a> for more information.<\/p>\n","protected":false},"excerpt":{"rendered":"

WEST LAFAYETTE, Ind. — The world\u2019s whitest paint \u2013 seen in this year\u2019s edition of Guinness World Records and \u201cThe Late Show With Stephen Colbert\u201d \u2013 keeps surfaces so cool that it could reduce the need for air conditioning. Now the Purdue University researchers<\/p>\n","protected":false},"author":7,"featured_media":4970,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7],"tags":[],"department":[31],"source":[29],"purdue_today_topic":[66],"coauthors":[182],"class_list":["post-4968","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-excellence","department-engineering","source-purdue-news","purdue_today_topic-research"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/posts\/4968","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/comments?post=4968"}],"version-history":[{"count":3,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/posts\/4968\/revisions"}],"predecessor-version":[{"id":4974,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/posts\/4968\/revisions\/4974"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/media\/4970"}],"wp:attachment":[{"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/media?parent=4968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/categories?post=4968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/tags?post=4968"},{"taxonomy":"department","embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/department?post=4968"},{"taxonomy":"source","embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/source?post=4968"},{"taxonomy":"purdue_today_topic","embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/purdue_today_topic?post=4968"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.purdue.edu\/newsroom\/wp-json\/wp\/v2\/coauthors?post=4968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}