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Contact angle measurements

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|materials = %Optional materials processed%
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[[{{PAGENAME}}|{{PAGENAME}}{{#if: {{#var:acronym}} | &nbsp;({{#var:acronym}})|}}]] Contact angle of a liquid on a solid measures the wettability of the surface. Wetting describes the degree to which a liquid spreads on a solid when it comes into contact with it, one measure of wetting is the contact angle. The contact angle is important wherever the intensity of the contact between liquid and solid substances needs to be checked or assessed: coating, painting, cleaning, printing, hydrophobic or hydrophilic coating, bonding, dispersing etc. More importantly, the value of the contact angle is directly related to the free surface Energy of the material via Young's equation<ref>Insert footnote text here</ref>. Hence, the contact angle is also related to the surface tension of the liquid and to the interfacial tension between the liquid and the solid. Lately, the relationship bewteen nanostrauctures on the surface and wettability has gained much interest; in this respect, the "lotus effect"<ref>https://www.teachengineering.org/view_lesson.php?url=collection/duk_/lessons/duk_surfacetensionunit_lessons/duk_surfacetensionunit_less4.xml</ref> which appears in nature, is something that scientist are trying to imitate for practical purposes.
 
==Equipment==
The apparatus to measure the contact angle are simple and in many cases are "home made' essentially one needs a good camera and a light to illuminate the surface from the back. Still, the equipment to measure the contact angle or "goniometers" (measure angle) are available.
 
===Rame-Hart Goniometer===
The Rame-Hart contact angle goniometer is widely used by scientist to study the interaction of liquids with the surface of semiconductors, which is a very good indication of cleanliness, surface activation, compatibility, etc.
{{main|Rame-Hart Goniometer}}
 
==Method of operation==
Optional description of materials that can be processed by technology. I think the best example of where this comes in handy would be with LPCVD describing the difference between HTO and LTO.
==Equipment==
The apparatus to measure the contact angle are simple and in many cases are "home made' essentially one needs a good camera and a light to illuminate the surface from the back. Still, the equipment to measure the contact angle or "goniometers" (measure angle) are available.
 
===Rame-Hart Goniometer===
The Rame-Hart contact angle goniometer is widely used by scientist to study the interaction of liquids with the surface of semiconductors, which is a very good indication of cleanliness, surface activation, compatibility, etc.
{{main|Rame-Hart Goniometer}}
==See also==
Administrator, LabUser, OnlineAccess, PhysicalAccess, Staff, StoreManager, StoreUser
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