A joint research team led by Professor Hee Tak Kim and Shin-Hyun Kim in the Department of Chemical and Biomolecular Engineering at KAIST developed a fabrication technology that can inexpensively produce surfaces capable of repelling liquids, including water and oil.
The team used the photofluidization of azobenzene molecule-containing polymers to generate a superomniphobic surface which can be applied for developing stain-free fabrics, non-biofouling medical tubing, and corrosion-free surfaces.
Mushroom-shaped surface textures, also called doubly re-entrant structures, are known to be the most effective surface structure that enhances resistance against liquid invasion, thereby exhibiting superior superomniphobic property.
However, the existing procedures for their fabrication are highly delicate, time-consuming, and costly. Moreover, the materials required for the fabrication are restricted to an inflexible and expensive silicon wafer, which limits the practical use of the surface.
To overcome such limitations, the research team used a different approach to fabricate the re-entrant structures called localized photofludization by using the peculiar optical phenomenon of azobenzene molecule-containing polymers (referred to as azopolymers). It is a phenomenon where an azopolymer becomes fluidized under irradiation, and the fluidization takes place locally within the thin surface layer of the azopolymer.
With this novel approach, the team facilitated the localized photofluidization in the top surface layer of azopolymer cylindrical posts, successfully reconfiguring the cylindrical posts to doubly re-entrant geometry while the fluidized thin top surface of an azopolymer is flowing down.
The structure developed by the team exhibits a superior superomniphobic property even for liquids infiltrating the surface immediately.
Moreover, the superomniphobic property can be maintained on a curved target surface because its surficial materials are based on high molecules.
Furthermore, the fabrication procedure of the structure is highly reproducible and scalable, providing a practical route to creating robust omniphobic surfaces.
Professor Hee Tak Kim said, “Not only does the novel photo-fluidization technology in this study produce superior superomniphobic surfaces, but it also possesses many practical advantages in terms of fab-procedures and material flexibility; therefore, it could greatly contribute to real uses in diverse applications.”
Professor Shin-Hyun Kim added, “The designed doubly re-entrant geometry in this study was inspired by the skin structure of springtails, insects dwelling in soil that breathe through their skin. As I carried out this research, I once again realized that humans can learn from nature to create new engineering designs.”
The paper (Jaeho Choi as a first author) was published in ACS Nano, an international journal for Nano-technology, in August.
The Latest on: Superomniphobic
- The design and applications of superomniphobic surfaces on March 3, 2017 at 4:00 pm
Correspondence: Professor A Tuteja, Department of Materials Science and Engineering, University of Michigan, 2800 plymouth Road, Building 10, Room A185, Ann Arbor, MI 48109, USA. E-mail: [email protected] 5 These authors contributed equally to this work. […]
- Groundbreaking adhesive tape will repel any liquid you can think of on October 20, 2016 at 5:00 pm
How well do you know your superomniphobic materials? If you’re like most people, the possible answers are “not very well” and “I think I missed the class where they taught us what a superomniphobic material is.” “A superomniphobic material is a ... […]
- Superomniphobic tape adheres to any surface on October 20, 2016 at 5:01 am
Arun Kota, assistant professor of mechanical engineering at Colorado State University, has made a superomniphobic tape that, when adhered to any surface, gives the surface liquid-repelling properties. This recent breakthrough has been published by ACS ... […]
- New 'super-repellent' material could protect medical implants on November 28, 2014 at 3:50 am
Instead, the roughness of the materials' surface is simply altered to make them "superomniphobic." Surface tension is the property that makes drops of liquid want to bead up. But, the surface that a liquid rests on can exert attractive forces that cause ... […]
- 13 Emerging Nanotechnologies And Materials That Will Change The World on May 15, 2014 at 7:40 am
Superomniphobic materials: Inspired by water bugs that float on liquid surfaces, these materials repel both oily and watery fluids. Scientifically viable today; mainstream and financially viable in 2015. Auxetic materials: When stretched, auxetic materials ... […]
- The Best Way to Invest in the "Golden Age of Materials Science" on February 12, 2013 at 9:00 pm
The researchers combined materials with different textures to create what they call "superomniphobic" surfaces ... into the marketplace … and into your home. The "Golden Age of Materials Science" isn't just about innovation. It's also one of the biggest ... […]
- Scientists Made Superomniphobic Material That Even Repels Blood on January 18, 2013 at 3:22 am
Scientists have developed a so-called "superomniphobic" surface that allows for the production of absolutely stain-proof, spill-proof clothing, protective garments, and other products that shrug off virtually every liquid - from blood and ketchup to ... […]
- Watch All Kinds of Liquids Bounce Off This New Super-Repellant Coating on January 17, 2013 at 6:40 am
In fact, the coating is actually referred to as being superomniphobic since hydrophobic coatings can still let certain liquids pass through a given material given its makeup or the conditions. But the new superomniphobic coating—composed of an ... […]
- The shirt you can't get dirty: Researchers create ultralight coating that can repel alcohol, coffee, oil and even petrol on January 17, 2013 at 4:50 am
Droplets of solutions that would normally damage either your shirt or your skin recoil when they touch the new 'superomniphobic surface'. 'Virtually any liquid you throw on it bounces right off without wetting it,' said Anish Tuteja, who led the study ... […]
via Google News and Bing News