lipophobicity
{{Short description|Chemical property}}
Lipophobicity, also sometimes called lipophobia (from the Greek λιποφοβία from λίπος lipos "fat" and φόβος phobos "fear"), is a chemical property of chemical compounds which means "fat rejection", literally "fear of fat". Lipophobic compounds are those not soluble in lipids or other non-polar solvents. From the other point of view, they do not absorb fats.
"Oleophobic" (from the Latin oleum "oil", Greek ελαιοφοβικό eleophobico from έλαιο eleo "oil" and φόβος phobos "fear") refers to the physical property of a molecule that is seemingly repelled from oil. (Strictly speaking, there is no repulsive force involved; it is an absence of attraction.)
The most common lipophobic substance is water.
Fluorocarbons are also lipophobic/oleophobic in addition to being hydrophobic.
Uses
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A lipophobic coating has been used on the touchscreens of Apple's iPhones since the 3GS,{{cite web |first=Bill |last=Nye |title=Giz Bill Nye Explains: The iPhone 3GS's Oleophobic Screen |publisher=Gizmodo |date=2009-06-24 |url=https://gizmodo.com/5302097/giz-bill-nye-explains-the-iphone-3gss-oleophobic-screen |accessdate=2014-09-11}} their iPads,{{cite web|title=Apple iPad Specs Page |publisher=Apple |date=2010-01-27 |url=https://www.apple.com/ipad/specs/ |url-status=dead |archiveurl=https://web.archive.org/web/20100130144829/http://www.apple.com/ipad/specs/ |archivedate=2010-01-30 }} Nokia's N9 and Lumia devices,{{Citation needed|date=August 2012}} the HTC HD2{{Citation needed|date=August 2012}}, the Blackberry DTEK50,{{Cite web|date=2016-07-26|title=BlackBerry DTEK50 Screen Specifications • SizeScreens.com|url=https://www.sizescreens.com/blackberry-dtek50-screen-specifications/|access-date=2020-12-07|website=SizeScreens.com|language=en-US}} Hero, and Flyer{{cite web |first=Alun |last=Taylor |title=HTC Flyer 7in Android Tablet review |publisher=The Register |date=2011-06-09 |url=http://www.reghardware.com/2011/06/09/review_htc_flyer_android_tablet/page2.html |accessdate=2014-09-11 |archive-url=https://web.archive.org/web/20120830225137/http://www.reghardware.com/2011/06/09/review_htc_flyer_android_tablet/page2.html |archive-date=2012-08-30 |url-status=dead }} and many other phones to repel fingerprint oil, which aids in preventing and cleaning fingerprint marks. Most "oleophobic" coatings used on mobile devices are fluoropolymer-based solids (similar to Teflon, which was used on the HTC Hero{{cite web |url=http://www.gsmarena.com/htc_hero-2861.php |title=HTC Hero Specifications |publisher=GSMArena |accessdate=2014-09-11}}) and are both lipophobic and hydrophobic. The oleophobic coating beads up the oils left behind a user's fingers, making it easy to clean without smearing and smudging. This helps decrease the feasibility of a successful smudge attack.{{Cite web|last=blogs.blackberry.com|title=Hackers Can Steal Your Password via Your Smartphone's Screen Smudges. The Smudge-Resistant DTEK50 Helps Prevent That.|url=https://blogs.blackberry.com/en/2016/07/hackers-can-steal-your-password-via-your-smartphones-screen-smudges-the-smudge-resistant-dtek50-helps-prevent-that|access-date=2020-12-07|website=blogs.blackberry.com|language=en}} In addition to being lipophobic or oleophobic, perfluoropolyether coatings impart exceptional lubricity to touch screens and give them a "slick feel" that eases their use.{{cite web|title=Fluorosilanes |publisher=Cytonix |date=2015-01-12 |url=http://www.cytonix.com/fluorosyl.html |url-status=dead |archiveurl=https://web.archive.org/web/20150402161148/http://www.cytonix.com/fluorosyl.html |archivedate=2015-04-02 }}
DIY products exist to restore or add an oleophobic coating to devices lacking one.{{cite web|title=iGlaco - Oleophobic Coating Kit |publisher=Island Trade |date=2019-11-22 |url=https://island-trade.com/iglaco_oleophobic_coating_kit/ }}
See also
References
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