{"id":95416,"date":"2023-02-09T12:42:43","date_gmt":"2023-02-09T11:42:43","guid":{"rendered":"https:\/\/www.mounthagen.de\/?p=95416"},"modified":"2024-07-19T09:26:10","modified_gmt":"2024-07-19T07:26:10","slug":"coffee-stains-for-better-solar-cells","status":"publish","type":"post","link":"https:\/\/www.mounthagen.de\/en\/coffee-culture\/coffeefacts\/coffee-stains-for-better-solar-cells\/","title":{"rendered":"<i>Coffee stains<\/i> for better <i>solar cells<\/i>."},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"95416\" class=\"elementor elementor-95416 elementor-94904\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c6c9e29 e-flex e-con-boxed e-con e-parent\" data-id=\"c6c9e29\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-ed68db5 e-con-full e-flex e-con e-child\" data-id=\"ed68db5\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-66d6c2d4 e-con-full e-flex e-con e-child\" data-id=\"66d6c2d4\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7f9ba3a3 elementor-align-center elementor-widget elementor-widget-post-info\" data-id=\"7f9ba3a3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-4443ade elementor-inline-item\" itemprop=\"about\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-terms\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-post-info__terms-list\">\n\t\t\t\t<span class=\"elementor-post-info__terms-list-item\">Coffee facts<\/span>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f241260 elementor-widget elementor-widget-heading\" data-id=\"4f241260\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\"><i>Coffee stains<\/i> for better <i>solar cells<\/i>.<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13bdeeef elementor-widget elementor-widget-text-editor\" data-id=\"13bdeeef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>We all know that coffee is amazing \u2013 <em>of course. But that coffee stains helped to find out how to make print methods and coatings more even and therefore better, that is quite surprising.<\/em><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5756f4ed elementor-author-box--layout-image-above elementor-author-box--align-center elementor-author-box--avatar-yes elementor-author-box--name-yes elementor-author-box--biography-yes elementor-widget elementor-widget-author-box\" data-id=\"5756f4ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"author-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-author-box\">\n\t\t\t\t\t\t\t<div  class=\"elementor-author-box__avatar\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.mounthagen.de\/wp-content\/uploads\/2024\/02\/cropped-cropped-Portrait-Kristin-120x120.png\" alt=\"Picture of Kristin Oldenburg\" loading=\"lazy\">\n\t\t\t\t<\/div>\n\t\t\t\n\t\t\t<div class=\"elementor-author-box__text\">\n\t\t\t\t\t\t\t\t\t<div >\n\t\t\t\t\t\t<h4 class=\"elementor-author-box__name\">\n\t\t\t\t\t\t\tKristin Oldenburg\t\t\t\t\t\t<\/h4>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-author-box__bio\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5dec1a0f elementor-align-center elementor-widget elementor-widget-post-info\" data-id=\"5dec1a0f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-4443ade elementor-inline-item\" itemprop=\"about\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-hashtag\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M440.667 182.109l7.143-40c1.313-7.355-4.342-14.109-11.813-14.109h-74.81l14.623-81.891C377.123 38.754 371.468 32 363.997 32h-40.632a12 12 0 0 0-11.813 9.891L296.175 128H197.54l14.623-81.891C213.477 38.754 207.822 32 200.35 32h-40.632a12 12 0 0 0-11.813 9.891L132.528 128H53.432a12 12 0 0 0-11.813 9.891l-7.143 40C33.163 185.246 38.818 192 46.289 192h74.81L98.242 320H19.146a12 12 0 0 0-11.813 9.891l-7.143 40C-1.123 377.246 4.532 384 12.003 384h74.81L72.19 465.891C70.877 473.246 76.532 480 84.003 480h40.632a12 12 0 0 0 11.813-9.891L151.826 384h98.634l-14.623 81.891C234.523 473.246 240.178 480 247.65 480h40.632a12 12 0 0 0 11.813-9.891L315.472 384h79.096a12 12 0 0 0 11.813-9.891l7.143-40c1.313-7.355-4.342-14.109-11.813-14.109h-74.81l22.857-128h79.096a12 12 0 0 0 11.813-9.891zM261.889 320h-98.634l22.857-128h98.634l-22.857 128z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-terms\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-post-info__terms-list\">\n\t\t\t\t<a href=\"https:\/\/www.mounthagen.de\/en\/tags\/respect\/\" class=\"elementor-post-info__terms-list-item\">Respect<\/a>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-15b3556e elementor-widget elementor-widget-text-editor\" data-id=\"15b3556e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tphoto: markus spiske on unsplash\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-19ed2cca elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"19ed2cca\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-16 elementor-top-column elementor-element elementor-element-42ca13ed\" data-id=\"42ca13ed\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-2966b14a\" data-id=\"2966b14a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5153c75c elementor-widget elementor-widget-text-editor\" data-id=\"5153c75c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em><strong>Prof. Dr. Nicolas Vogel and his team at Friedrich-Alexander-Universit\u00e4t Erlangen-N\u00fcrnberg at the chemistry and bioengineering department developed a strategy together with scientists from Edinburgh, to suppress the coffee-stain-effect and to reach an even drying pattern.<\/strong><\/em><\/p><p><em><strong>That means:<\/strong><\/em> When you spill coffee, the liquid evaporates faster at the edges of the droplet than in the center. Because the coffee contains small, solid particles from the brewing. And these have a different drying time. That\u2019s why they are drawn to the edge of the droplet \u2013 which causes the coffee ring to form. (So far so clear?) The same applies to ink, red wine, and other liquids that contain particles.<\/p><p>The <em>\u201c<strong>researchers have discovered that the trick<\/strong> to achieving consistent drying patterns is modifying the surfaces of the particles with polymer chains so that they efficiently repel each other while being strongly attracted to the surface of the droplet. Spatial repulsion prevents particle accumulation at the edge of the droplet, while particle attachment to the droplet surface results in a homogeneous particle film. When they are combined both effects prevent the formation of a coffee ring.\u201d<\/em> And that again helps to optimize the coating processes of, for example, solar cells.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-16 elementor-top-column elementor-element elementor-element-5bf24766\" data-id=\"5bf24766\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-54fa4280 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54fa4280\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-16 elementor-top-column elementor-element elementor-element-46fcb165\" data-id=\"46fcb165\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-6187ea7f\" data-id=\"6187ea7f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-288b902e elementor-widget elementor-widget-heading\" data-id=\"288b902e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Let\u2019s not ever complain about coffee stains again.\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-16 elementor-top-column elementor-element elementor-element-e807fbd\" data-id=\"e807fbd\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-53148f6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"53148f6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-16 elementor-top-column elementor-element elementor-element-f3240f8\" data-id=\"f3240f8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-5215ae9\" data-id=\"5215ae9\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9d49f04 elementor-widget elementor-widget-text-editor\" data-id=\"9d49f04\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>*Source:<\/em><br \/><em><a href=\"https:\/\/www.fau.eu\/2022\/06\/03\/news\/research\/more-than-a-coffee-ring\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">www.fau.eu\/2022\/06\/03\/news\/research\/more-than-a-coffee-ring\/<\/a><\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-16 elementor-top-column elementor-element elementor-element-ba8425b\" data-id=\"ba8425b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p><b><I>Not a joke: The coffee-stain-phenomenon<\/I><\/b> \u2013 also known as the \u201ccoffee-stain-effect\u201d &#8211; was the subject of a study, that accomplished to make coating processes of e.g. solar cells, transistors, or biosensors more reliable. <I>What\u2026?<\/I><\/p>\n","protected":false},"author":3,"featured_media":111192,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[256],"tags":[69],"custom_tag":[300],"class_list":["post-95416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coffeefacts","tag-respect","custom_tag-how-crazy-is-that"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/posts\/95416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/comments?post=95416"}],"version-history":[{"count":0,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/posts\/95416\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/media\/111192"}],"wp:attachment":[{"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/media?parent=95416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/categories?post=95416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/tags?post=95416"},{"taxonomy":"custom_tag","embeddable":true,"href":"https:\/\/www.mounthagen.de\/en\/wp-json\/wp\/v2\/custom_tag?post=95416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}