Aerospace Applications in Nanotechnology Updated September 2011 Nanotechnology What Are The Uses of Hydrophobic Coatings? Updated September 2011 Hydrophobic (adj): resistant to or avoiding wetting Updated September 2011 Hydrophobic properties have been seen in nature since the beginning of time. Water droplets falling onto plant leaves roll off the leaves as seen in the photo below. cc by Ralph P. Updated September 2011 In this artist’s rendering, we see that the surface of leaves have small hair-like strands that are covered with a waxy substance. This keeps the water droplets from absorbing into the leaf. cc by William Thielicke Updated September 2011 Scientists today are able to simulate the natural hydrophobic properties using nanotechnology. By applying a thin coating of hydrophobic substances, we are able to create surfaces that are water-resistant. The glasses below have been treated with a hydrophobic product from Aculon, Inc. Images ©Aculon Before treatment Updated September 2011 After treatment cc by Andrew Cannon The graphic on the left shows that the solid on which the liquid is laid is non-hydrophobic, the middle graphic is hydrophobic, and the graphic on the right shows super hydrophobic. Hydrophobic leaf with a water droplet rolling off the surface. cc by Michael Apel Updated September 2011 Hydrophobic coatings are being used in many different areas: •Aerospace •Wood construction •Monument protection •Automobile windshields •Graffiti cleanup Updated September 2011 Graffiti Cleanup The effort to clean up graffiti around the world costs over a billion dollars annually. Companies such as Advanced Graffiti Solutions” are developing and using products made using nanotechnology to treat walls and buildings so graffiti can simply be wiped off. Updated September 2011 cc by Sry85 Products such as spray coatings and paint have been developed to treat structures so the graffiti can be wiped off with little effort. The coating adheres to the stone or cement and does not allow the graffiti materials to attach to the wall. Follow the link below for videos showing the products at work. http://www.youtube.com/watch?v=Rp4 vkY5kgTA&feature=related Updated September 2011 Water Resistant Coating Many companies, such as Turtle Wax, have developed a wax that adheres to the surface of a car and makes the paint completely resistant to environmental contaminants. http://www.youtube.com/watch?v=e5rGovKcEYY&NR=1 Updated September 2011 Monument Protection Much of the damage to protected monuments around the world is caused by weather. Using nanotechnology, a protective coating can be applied to the monuments to protect them from the elements. Nanotechnology prevents water from seeping into the crevices and freezing to cause cracks and damage. cc by Luis Garcia Updated September 2011 Wood Protection Wood, when sprayed with a protective coating, will not burn. In the pictures, the board on the right is burning. The board on the left looks to be charred, but the charring scrapes off with ease. http://www.youtube.com/watch?v=q7ZwQlCcN-g&NR=1 Updated September 2011 A nano protective coating also makes wood water-resistant. http://www.youtube.com/watch?v=EmW4TZsZLI0&feature=related Updated September 2011 Windshield Protection Chemsultants International has developed a coating that is applied to a windshield. With the coating, the surface becomes resistant to environmental elements. http://www.youtube.com/watch?v=96iMj5NSyyY&feature=relate Updated September 2011 Hydrophobic coatings using nanotechnology are helping in the aerospace industry by making airplane wings resistant to water and ice coatings. Many airplane crashes have been attributed to ice on the wings before and during flight. Updated September 2011 Image courtesy Purdue In this classroom activity, we will simulate how a hydrophobic coating applied to the wings of a gliders will affect its flight. Using balsa wood materials and instructions, build two identical gliders. Image by HighPoint Learning Updated September 2011 Image by HighPoint Learning On one of the gliders, spray at least five coats of a protective coating, allowing the wood to dry in between coats. Updated September 2011 Images by HighPoint Learning After spraying the gliders, weigh each glider with a digital gram scale. Notice there is only a small difference in the weight. Updated September 2011 Sprinkle water on both wings of each glider, and then place them in the freezer and leave overnight. After 24 hours, take the gliders out of the freezer and immediately launch them. Observe the difference between their flights. Updated September 2011 This module is one of a series designed to introduce faculty and high school students to the basic concepts of nanotechnology. Each module includes a PowerPoint presentation, discussion questions, and hands-on activities, when applicable. The series was funded in part by: The National Science Foundation Grant DUE-0702976 and the Oklahoma Nanotechnology Education Initiative Any opinions, findings and conclusions or recommendations expressed in the material are those of the author and do not necessarily reflect the views of the National Science Foundation or the Oklahoma Nanotechnology Education Initiative. Updated September 2011 Image Credits P., Ralf. (Photographer). Lotus Effect [Photograph]. Switzerland. Wikimedia Commons. (commons.wikimedia.org) Thielicke, William. (Artist). Lotus3.jpg [Computer rendering]. Germany. Wikimedia Commons. (commons.wikimedia.org) Cannon, Andrew H. (Designer). Microstruct superhydrophobic.png [diagram]. Wikimedia Commons. (commons.wikimedia.org) Apel, Michael. (Photographer). Dew drop on a leaf [Photograph]. Wikimedia Commons. (commons.wikimedia.org) Sry85 (Photographer). Tagging in Thailand. [Photograph]. Thailand. Wikimedia Commons. (commons.wikimedia.org) Garcia, Luis (Photographer). Monumento a Fray Pedro Ponce [Photograph of Monument]. Spain. Wikimedia Commons (commons.wikimedia.org) Wing Icing [Photograph]. United States. Aviation Educaton Multimedia Library (http://www2.tech.purdue.edu/at/courses/aeml/) Updated September 2011 References Chandler, David. (2010). Frost-Free Planes: Back to the Drawing Board. MIT News. Retrieved from http://web.mit.edu/newsoffice/2010/frost-formation-1222.html Samyn, P., Schoukens, G. Van den Abbeele, H., Vonck, L., Stanssens, D. (2010). Application of polymer nanoparticle coating for tuning the hydrophobicity of cellulosic substrates. Journal of Coatings Technology and Research. Issue 1547-0091. Pages 1-11.] Seung-Mo Lee and Tai Hun Kwon. Mass-producible replication of highly hydrophobic surfaces from plant leaves. NanoWerk. Retrieved from http://www.nanowerk.com/spotlight/spotid=644.php Wilson, Michael, Kanangara, Kamali, Smith, Geoff, Simmons, Michelle, & Raguse, Burkhard. Nanotechnology: Basic Science and Emerging Technologies. (2004). [Kindle Edition] Retrieved from http://www.amazon.com Updated September 2011