{"id":7000,"date":"2017-09-01T08:00:15","date_gmt":"2017-09-01T14:00:15","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=7000"},"modified":"2018-02-09T15:23:06","modified_gmt":"2018-02-09T21:23:06","slug":"pc-understanding-multifunctional-coatings","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/7000\/pc-understanding-multifunctional-coatings\/","title":{"rendered":"Understanding Multifunctional Coatings"},"content":{"rendered":"<p>Traditional coatings serve one or sometimes two functions, which include decoration and substrate protection or both. In addition to these fundamental properties, <strong><em>Multifunctional Coatings <\/em><\/strong>can provide an impressive array of additional performance benefits, including:<\/p>\n<ul>\n<li>Surface resistance to mildew, mold and bacteria<\/li>\n<li>Anti-fouling without metals<\/li>\n<li>Superhydrophobicity<\/li>\n<li>Self-healing anticorrosion<\/li>\n<li>Self-healing scratch repair<\/li>\n<li>Thermochromic<\/li>\n<li>Ultralubricity<\/li>\n<li>Highly conductive coatings<\/li>\n<\/ul>\n<p>Some Multifunctional Coatings may also fall into the category of Smart Coatings, as in many cases they are responsive to their environment. Their functional properties are essentially independent of each other and include the performance attributes listed above as well as many other possibilities too numerous to detail in this article.<\/p>\n<p>Many of these innovative breakthroughs were adapted from naturally occurring materials and biology.<\/p>\n<p>For example, why does a lotus leaf shed water?<\/p>\n<h3>Self-cleaning coatings<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7001 aligncenter\" src=\"https:\/\/ulprospector.ul.com\/media\/2017\/08\/lotus-leaf-effect-multifunctional-coatings.png\" alt=\"\" width=\"761\" height=\"292\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/lotus-leaf-effect-multifunctional-coatings.png 761w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/lotus-leaf-effect-multifunctional-coatings-300x115.png 300w\" sizes=\"(max-width: 761px) 100vw, 761px\" \/><\/p>\n<p>A <strong><em>lotus leaf<\/em><\/strong> sheds water due to the unique micro and nanoscale architecture on the surface that minimizes the droplet&#8217;s adhesion to the surface. The contact angle of water on the surface of a lotus leaf is greater than 150\u00b0 and thus water droplets readily roll off the surface.<\/p>\n<p>The cause of self-cleaning properties of the lotus leaf is the hydrophobic water-repellent double structure of the surface. This significantly reduces the contact area and the adhesion force between surface and droplet and results in a self-cleaning process, allowing water to readily roll off the leaf and collect dust deposits on the way. This micron size double structure is formed at the surface of the plant and is comprised of needle-like projections from the surface that are covered by wax.<\/p>\n<p>The wax-covered projections are 10 to 20\u00a0\u00b5m in height and 10 to 15\u00a0\u00b5m in width. The waxes are hydrophobic and form the top layer of the double structure. Some plants show contact angles up to 160\u00b0 and are called superhydrophobic; only 2\u20133 percent of the surface of a water droplet is in contact with the surface. A surface contact area of less than 0.6 percent leads to the self-cleaning effect.<\/p>\n<h3>SLIPS technology<\/h3>\n<p>Why does the Nepenthes pitcher plant provide a slippery surface?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7002 aligncenter\" src=\"https:\/\/ulprospector.ul.com\/media\/2017\/08\/nepenthes-pitcher-plant-multifunctional-coatings.png\" alt=\"\" width=\"827\" height=\"258\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/nepenthes-pitcher-plant-multifunctional-coatings.png 827w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/nepenthes-pitcher-plant-multifunctional-coatings-300x94.png 300w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/nepenthes-pitcher-plant-multifunctional-coatings-768x240.png 768w\" sizes=\"(max-width: 827px) 100vw, 827px\" \/><\/p>\n<p>The carnivorous <strong><em>Nepenthes pitcher plant<\/em><\/strong> may be found in many tropical regions of the world. Surrounding the entrance or lip of the trap is a structure called the peristome. While colorful to attract prey, it also provides unstable footing due to the presence of a slippery liquid substance. When this surface is wet, it causes prey to slip and fall into the trap.<\/p>\n<p>When this phenomenon is engineered into a substrate surface, it results in a multitude of very unique performance properties which can provide one or more surface properties. These properties include:<\/p>\n<ul>\n<li>Non-stick<\/li>\n<li>Antifouling without the use of metals<\/li>\n<li>Self-healing<\/li>\n<li>Icephobic<\/li>\n<li>Bacteria and contaminant repellency<\/li>\n<\/ul>\n<h3>Conductive coatings<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-7003\" src=\"https:\/\/ulprospector.ul.com\/media\/2017\/08\/burning-candle-2389465_amek-pixabay-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/burning-candle-2389465_amek-pixabay-300x200.jpg 300w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/burning-candle-2389465_amek-pixabay-768x512.jpg 768w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/burning-candle-2389465_amek-pixabay-1024x682.jpg 1024w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/burning-candle-2389465_amek-pixabay.jpg 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Why is some candle soot conductive?<\/p>\n<p>Candle soot can be conductive as it contains irregular nanotubes. Further research resulted in carbon nanotubes which provide <strong><em>conductive coatings<\/em><\/strong> without the use of conductive metal(s).<\/p>\n<figure id=\"attachment_7004\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 425px\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7004 size-full\" src=\"https:\/\/ulprospector.ul.com\/media\/2017\/08\/ron-surface-resistivity-multifunctional-coatings.jpg\" alt=\"\" width=\"425\" height=\"321\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/ron-surface-resistivity-multifunctional-coatings.jpg 425w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/ron-surface-resistivity-multifunctional-coatings-300x227.jpg 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><figcaption class=\"caption wp-caption-text\">Surface resistivity of aqueous and solvent-borne clear coats depending on concentration of multi wall carbon nanotubes. SOURCE: <a href=\"http:\/\/www.chemanager-online.com\/en\/topics\/chemicals-distribution\/carbon-nanotubes-conductive-coatings\" target=\"_blank\" rel=\"noopener\">Chemanager-Online.com<\/a><\/figcaption><\/figure>\n<p>Carbon nanotubes (CNTs) were first named in the 90s, but their use in coatings has just begun to be harvested in the last five to 10 years. CNTs can be single walled (SWNT) or multiwalled (MWNT). CNTs have exceptional strength due in part to their extremely high length-to-width ratio, extraordinary <a href=\"https:\/\/en.wikipedia.org\/wiki\/Thermal_conductivity\">thermal conductivity<\/a>, mechanical, and <a href=\"https:\/\/en.wikipedia.org\/wiki\/Electricity\">electrical<\/a> properties. With these properties, carbon nanotubes make effective additives to various structural materials.<\/p>\n<figure id=\"attachment_7005\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 458px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7005\" src=\"https:\/\/ulprospector.ul.com\/media\/2017\/08\/ron-carbon-nano-tube.png\" alt=\"\" width=\"458\" height=\"145\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/ron-carbon-nano-tube.png 458w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2017\/08\/ron-carbon-nano-tube-300x95.png 300w\" sizes=\"(max-width: 458px) 100vw, 458px\" \/><figcaption class=\"caption wp-caption-text\">Image of single walled carbon nanotube (CNT). CNTs are about 1 nm wide and can be 10<sup>6<\/sup> nm or more in length.<\/figcaption><\/figure>\n<p>The bonds in CNTs are SP<sup>2<\/sup> which, along with CNTs structure, provide their unique properties. CNTs application in coatings is in its infancy, however CNTs are expected to provide differential properties in coatings that will include corrosion resistance, improved mechanical properties and very high conductivity.<\/p>\n<p><strong><em>Self-healing<\/em><\/strong> coatings can be made by incorporating microcapsules and nanocapsules that contain film-forming polymers. When the coating is scratched, the capsules break and fill the scratch with a polymeric fluid that forms a film. Self-healing technology is used by some automakers in clear-coat automotive topcoats.<\/p>\n<p>Other self-healing coatings are film formers, which protect the underlying substrates from corrosion through the release of microcapsules that contain corrosion-inhibiting chemicals.<\/p>\n<p><strong><em>Thermochromatic <\/em><\/strong>paint utilizes special pigments which change color as the temperature changes.<\/p>\n<p>In summary, a wide variety of innovations in material science and coatings technology are enabling an impressive array of new Mulitifunctional Coatings and applications.<\/p>\n<p>A search of Prospector\u2019s database yields a number of materials that can provide a variety of properties when properly formulated into a coating system, such as:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/Product\/search?k=Hydrophobics&amp;sug=1&amp;st=31\" target=\"_blank\" rel=\"noopener\">hydrophobicity<\/a><\/li>\n<li><a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=conductive&amp;st=31\" target=\"_blank\" rel=\"noopener\">conductivity<\/a><\/li>\n<li><a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=antimicrobial&amp;st=31\" target=\"_blank\" rel=\"noopener\">antimicrobial<\/a><\/li>\n<li>self-cleaning capability<\/li>\n<li><a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=thermochromic&amp;st=31\" target=\"_blank\" rel=\"noopener\">thermochromic<\/a><\/li>\n<\/ul>\n<h3>Further reading:<\/h3>\n<ul>\n<li><a href=\"https:\/\/ulprospector.ul.com\/6505\/pc-smart-coatings-primer-infographic?st=31\">Smarten Up! A Smart Coatings Primer<\/a><\/li>\n<li><a href=\"https:\/\/ulprospector.ul.com\/3657\/pc-smart-coatings?st=31\">Smart Coatings: Self-Healing, Anti-Fouling &amp; Sensing Material Developments<\/a><\/li>\n<li><a href=\"https:\/\/ulprospector.ul.com\/2530\/pc-hydrophobic-coatings?st=31\">Hydrophobic Coatings Explained<\/a><\/li>\n<\/ul>\n<h3>Resources:<\/h3>\n<p><a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings?st=31\">UL Prospector<\/a><br \/>\n<a href=\"https:\/\/www.onepetro.org\/conference-paper\/NACE-04278\">Self Healing Coatings Using Microcapsules and Nanocapsules<\/a><br \/>\n<a href=\"http:\/\/www.chemanager-online.com\/en\/topics\/chemicals-distribution\/carbon-nanotubes-conductive-coatings\">Carbon Nanotubes in Conductive Coatings<\/a><br \/>\n<a href=\"http:\/\/slipstechnologies.com\/about-slips\/\">slipstechnology.com<\/a><br \/>\n<a href=\"http:\/\/NASA.gov\" target=\"_blank\" rel=\"noopener\">NASA.gov<\/a><br \/>\nWikipedia: <a href=\"https:\/\/en.wikipedia.org\/wiki\/Nepenthes\" target=\"_blank\" rel=\"noopener\">Nepenthes<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Traditional coatings serve one or sometimes two functions, which include decoration and substrate protection or both. In addition to these fundamental properties, Multifunctional Coatings can provide an impressive array of additional performance benefits, including: Surface resistance to mildew, mold and &hellip; <a href=\"https:\/\/ulprospector.ul.com\/7000\/pc-understanding-multifunctional-coatings\/\">Continued<\/a><\/p>\n","protected":false},"author":12,"featured_media":7007,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[16],"tags":[219],"ppma_author":[1249],"class_list":["post-7000","post","type-post","status-publish","format-standard","has-post-thumbnail","category-paint-coatings","tag-category-overview","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Multifunctional coatings: Performance additives inspired by nature<\/title>\n<meta name=\"description\" content=\"Multifunctional coatings can provide an impressive array of performance features, many drawn from examples in the wild. 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