{"id":29151,"date":"2018-04-26T11:10:34","date_gmt":"2018-04-26T15:10:34","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=29151"},"modified":"2018-05-10T13:13:33","modified_gmt":"2018-05-10T17:13:33","slug":"cleaning-oil-spills-materials-inspired-salvinia-effect","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/cleaning-oil-spills-materials-inspired-salvinia-effect.htm","title":{"rendered":"Cleaning Oil Spills with Materials Inspired By the Salvinia Effect"},"content":{"rendered":"

In our collective cultural mind, oil and water don’t mix; this is so well-understood that the oil and water comparison is a clich\u00e9. In reality, however, it’s not so easy to separate oil and water. This is a particularly thorny problem once oil has spilled in the ocean.<\/span><\/p>\n

Scientists have clearly established that existing oil spill remediation techniques are<\/span> woefully inadequate<\/span><\/a> to their task.<\/span> Containment<\/span><\/a> is often the best decision-makers can hope for. For this reason, many researchers are searching for more effective ways to remove oil and other toxic substances from water. A team from the University of Southern California (USC) has recently created<\/span> a new material<\/span><\/a> for drawing oil out of water using a unique natural design as inspiration.<\/span><\/p>\n

The Salvinia effect<\/span><\/h2>\n

Chances are good that you’ve observed droplets of water beading on the surface of a Lotus leaf, or some other super-hydrophobic surface. These surfaces have inspired numerous materials, such as weatherproofing for vehicles and windows; a super-hydrophobic model is ideal for this application, because the goal is to prevent moisture from making contact and direct it outward and away from the coated surface.<\/span><\/p>\n

However, for dealing with oil spills, the goal is more complex. The goal isn’t to wick oil away into the ocean, but to separate it, and \u201chold\u201d it for removal. Associate Professor <\/span>Yong Chen<\/span><\/a> of the Daniel J. Epstein School of Industrial and Systems Engineering at the USC Viterbi School of Engineering corresponded with EM about how the research team approached the problem.<\/span><\/p>\n

\"salvinia\"

The scanning electron microscope images of the four types of trichomes found in salvinia species, (A) cucullata type, (B) oblongifia type, (C) natans type, (D) molesta type, scale bars 200 micrometers. (Credit: Yang et al.)<\/p><\/div>\n

\u201cThe first inspiration comes from the dew on the grass leaf,\u201d explains Professor Chen. \u201cLater [my colleague Yang Yang, a postdoctoral researcher] searched recent research and found that the <\/span>Salvinia molesta<\/span><\/i> plant possesses the most powerful superhydrophobic property in nature.\u201d<\/span><\/p>\n

Although superhydrophobic plant surfaces such as those of the Lotus offer low hysteresis and very high contact angles, the air layers persist between the surface structures for very short periods of time. However, for the upper leaf side of the <\/span>Salvinia molesta<\/span><\/i>, those air layers often persist for months.<\/span><\/p>\n

This difference in design is likely due to the unique needs of the plant. Its super-hydrophobic surface keeps it on top of the water, allowing it to access the air it needs to survive. If the plant sinks into the water, it dies. The Salvinia plant, therefore, evolved a mechanism that allows it to float, and its secret is on its super-hydrophobic surface.<\/span><\/p>\n

The Salvinia plant maintain those layers of air and \u201cholds on\u201d to a substance in water by growing hydrophilic pin structures on its hydrophobic surface. The plant thus retains a stable layer of air, enabling it to hold and manipulate microdroplets. The USC team chose <\/span>Salvinia molesta<\/span><\/i> for research for this reason.<\/span><\/p>\n

\u201cOn a superhydrophobic lotus leaf surface, the water droplet slips easily; that’s called the \u2018lotus effect,\u2019\u201d Chen describes. \u201cBut for the Salvinia leaf, water droplets can adhere to the surface, and it’s harder for them to slip; we call this the \u2018petal effect.\u2019 We can control and manipulate microdroplets and the way they adhere to the surface by designing different numbers of eggbeater arms.\u201d<\/span><\/p>\n

\"salvinia\"

The eggbeater shapes. (Credit: Screenshot, from video posted by Dr. Yong Chen)<\/p><\/div>\n

The \u201cpetal effect\u201d is also known as the \u201cSalvinia effect.\u201d<\/span><\/p>\n

Creating new super-hydrophobic surfaces<\/span><\/h2>\n

Chen and the team have now mimicked the eggbeater-shaped hydrophilic pins of the Salvinia using 3D printing. The concept allows them to use droplet-based microfluidics in multiple applications, including one for removing oil from water in a spill cleanup situation. The droplet-based microfluidics tool can also be used in DNA sequencing, microreactors for chemical synthesis, microfluidic mixing, drug testing, drug delivery, and other applications.<\/span><\/p>\n

While super-hydrophobicity isn’t unique to Salvinia, the eggbeater-shaped pins are.<\/span><\/p>\n

\u201cThis eggbeater structure are seen mostly in <\/span>Salvinia molesta<\/span><\/i>,\u201d remarks Chen. \u201cThere are other interesting microstructures on Salvinia species, shown in Figure 1. The reason we chose the eggbeater structures to study is that <\/span>Salvinia molesta<\/span><\/i> possesses the highest contact angles, and therefore, the most superhydrophobicity.\u201d<\/span><\/p>\n

The researchers successfully recreated the eggbeater microstructures using plastic and carbon nanotubes, arriving at a material with both super-hydrophobic and oleophilic properties.<\/span><\/p>\n

\u201cWe built the surface with microscale eggbeater structures by our developed immersed surface accumulation 3D printing process,\u201d remarks Chen. \u201cWe are the first to build this eggbeater structure at the same scale as it occurs in nature using 3D printing. Our eggbeater structure may have many applications, including oil spill clean-up.\u201d<\/span><\/p>\n

It is the combination oleophilic and super-hydrophobic qualities that enable the material to generate capillary forces that separate oil and water with a high level of efficiency.<\/span><\/p>\n

\"salvinia\"

Compare the lotus and the petal effect. (Credit: Screenshot, from video posted by Dr. Yong Chen)<\/p><\/div>\n

\u201cInspired by the multiaxis CNC accumulation process, the immersed surface accumulation 3D printing system consisted of an optical system, a mechanical system, and a light guide tool changing system,\u201d details Chen. \u201cThe material we are now using is a photocurable E-glass resin with carbon nanotubes added into the resin to increase the surface roughness of the composites. The higher surface roughness corresponds with higher superhydrophobic properties.\u201d<\/span><\/p>\n

Now that the researchers have created a prototype, they are working to apply the technology at scale for cleaning oil spills in the ocean. Along the way, they will hopefully develop other useful applications.<\/span><\/p>\n

\u201cFurther research will lie in the fabrication of large area eggbeater structures for massive oil spill cleanup and oil water separation,\u201d Chen comments. \u201cFurther study is required on the air retaining property of this eggbeater surface, so potential applications in anything from drag force reduction of ships, to robotics and swimsuits can be realized.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

A new material inspired by the Salvinia plant may offer new hope for cleaning up oil spills and other superhydrophobic applications.<\/p>\n","protected":false},"author":31,"featured_media":29148,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,52],"tags":[615,239,60,109,614,349,405],"class_list":["post-29151","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured-articles","category-technology","tag-3d-printing","tag-applications","tag-featured","tag-news-ticker","tag-oil-spill","tag-technology","tag-university-of-southern-california"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\nCleaning Oil Spills with Materials Inspired By the Salvinia Effect<\/title>\n<meta name=\"description\" content=\"A new material inspired by the Salvinia plant may offer new hope for cleaning up oil spills and other superhydrophobic 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