Oil and organic solvents are super wetting on stainless steel surfaces. Cleaning those surfaces can be difficult. Is it possible to make an oil repelling surface? We tested our new Notak® coating on oil and solvents, here's what we found out.
Applying an Oleophobic Coating to Stainless Steel
Low surface tension liquids like oil or organic solvents are designed to wet the surface for maximum lubrication or solvation. But what if you're separating organics or don't want the surface to wet? Water repelling materials like PTFE aren't effective in repelling oil. Here's what oil and hexadecane look like when placed on a PTFE surface.
We bonded our new Notak® material on a rough stainless steel surface to see if the contact angle would increase. Notak was applied by a chemical vapor deposition process that bonds an oil repelling compound to the stainless steel surface. The Notak surface made a big difference in contact angle, making the stainless steel an oleophobic surface.
Given the nature of refining or cleaning for that matter, we can expect the surface to be exposed to elevated temperatures. PTFE is high temperature limited and can fail in many high temperature applications. We exposed the Notak coating to elevated temperature (300°C) for several hours to gauge the impact to wettability and contact angle on various surfaces. The graph below shows consistent contact angle readings over the 90+ hour test. PTFE would have failed at 250°C.
The contribution of surface energy and it's relationship to process fluids can have far ranging impacts. Surface interaction can impact corrosion, fouling, analytical sampling results, filtration and separation. So it's important to understand how to manage the energy of critical flow path surfaces.
Get some really informative and helpful tips on ways to prevent fouling, change surface energy, & improve surface performance.
What is Notak?
We're looking forward to a new coating our R&D team has been developing. Full disclosure, we're still working on the final coating product and process details, but we can offer limited evaluation/beta test samples. If you're interested in learning more about our new Notak fluoro based coating, contact us and we can discuss your application.
We recently developed a new fluoro chemistry based coating that proved to be super hydrophobic and have interesting surface properties that have anti fouling or non stick properties that improve mold release. Notak is applied by chemical vapor deposition to stainless steel surfaces. The Notak process is non line of sight so the coating can be applied to intricate parts both internally and externally. As we develop applications we'll be posting further information on Notak. For now, we're looking forward to a new coating our R&D team has been developing. Full disclosure, we're still working on the final coating product and process details, but we can offer limited evaluation/beta test samples. If you're interested in learning more about our new Notak® fluoro based coating, contact us and we can discuss your application.