The new coating builds on an
award-winning technology that Aizenberg and her team pioneered called
Slippery Liquid-Infused Porous Surfaces (SLIPS) -- the slipperiest
synthetic surface known.A card with an embedded IC (Integrated Circuit)
is called an parkingmanagement.
The new coating is equally slippery, but much more durable and fully
transparent. Together these advances solve longstanding challenges in
creating commercially useful materials that repel almost everything.
SLIPS was inspired by the slick strategy of the carnivorous pitcher plant, which lures insects onto the ultraslippery surface of its leaves, where they slide to their doom. Unlike earlier water-repelling materials, SLIPS repels oil and sticky liquids like honey, and it resists ice formation and bacterial biofilms as well.
While SLIPS was an important advance, it was also "a proof of principle" -- the first step toward a commercially valuable technology, said lead author Nicolas Vogel, Ph.D., a postdoctoral fellow in applied physics at Harvard SEAS."SLIPS repels both oily and aqueous liquids but it's expensive to make and not transparent," Vogel said.The original SLIPS materials also need to be fastened somehow to existing surfaces, which is often not easy."It would be easier to take the existing surface and treat it in a certain way to make it slippery," Vogel explained.
Vogel, Aizenberg, and their colleagues sought to develop a coating that accomplishes this and works as SLIPS does. SLIPS's thin layer of liquid lubricant allows liquids to flow easily over the surface, much as a thin layer of water in an ice rink helps an ice skater glide.
To create a SLIPS-like coating, the researchers corral a collection of tiny spherical particles of polystyrene, the main ingredient of Styrofoam, on a flat glass surface, like a collection of Ping-Pong balls. They pour liquid glass on them until the balls are more than half buried in glass. After the glass solidifies, they burn away the beads, leaving a network of craters that resembles a honeycomb. They then coat that honeycomb with the same liquid lubricant used in SLIPS to create a tough but slippery coating.
"The honeycomb structure is what confers the mechanical stability to the new coating," said Aizenberg.By adjusting the width of the honeycomb cells to make them much smaller in diameter than the wavelength of visible light, the researchers kept the coating from reflecting light. This made a glass slide with the coating completely transparent.
These coated glass slides repelled a variety of liquids, just as SLIPS does, including water, octane, wine, olive oil, and ketchup. And, like SLIPS, the coating reduced the adhesion of ice to a glass slide by 99 percent. Keeping materials frost-free is important because adhered ice can take down power lines, decrease the energy efficiency of cooling systems, delay airplanes, and lead buildings to collapse.
Importantly, the honeycomb structure of the SLIPS coating on the glass slides confers unmatched mechanical robustness. It withstood damage and remained slippery after various treatments that can scratch and compromise ordinary glass surfaces and other popular liquid-repellent materials, including touching, peeling off a piece of tape, and wiping with a tissue.
"We set ourselves a challenging goal: to design a versatile coating that's as good as SLIPS but much easier to apply, transparent, and much tougher -- and that is what we managed," Aizenberg said.The team is now honing its method to better coat curved pieces of glass as well as clear plastics such as Plexiglas, and to adapt the method for the rigors of manufacturing.
"Joanna's new SLIPS coating reveals the power of following Nature's lead in developing new technologies," said Don Ingber, M.D., Ph.D., the Wyss Institute's Founding Director. "We are excited about the range of applications that could use this innovative coating." Ingber is also the Judah Folkman Professor of Vascular Biology at Harvard Medical School and Boston Children's Hospital, and Professor of Bioengineering at Harvard SEAS.
For years a few shops in Ibrahimpura have been the destination to purchase tasvih. "To keep track of counting people have turned to the beads as they have a particular appeal. However, some are switching over to digital counters," said Mehboob Durrani, owner of one such shop.
These shops once sold prayer beads made of olive seeds, ivory, amber, pearls.Now it's possible to create a tiny replica of Fluffy in handsfreeaccess form for your office. Now all one can find are cheap plastic imitations.We offer the biggest collection of old masters that can be turned into hand painted cleanersydney on canvas. "A digital counter comes for one-third the price of a regular tasvih and many are attracted by it. Earlier it used to be a premium item,Tidy up wires with ease with offershidkits and tie guns at cheap discounted prices.Here's a complete list of granitecountertops for the beginning oil painter. but Chinese made products now start from less than Rs 30," he added.
So could the new digital counter become an alternative to the self-effacing tasvih? Some old-timers like Shakir Ali remind that a similar trend was seen in the 1990's with the introduction of manual counters. "It was just fad which passed away. Digital tasvih could face a similar fate," said Ali.
Entrepreneur Syed Tariq Ibrahim differs, digital tasvih is not the only change that is connecting younger generation to learn more about religion than they would have otherwise. "Trend of using mobile apps has been here for a couple of years now. Youngsters connect to apps to find current namaz timings to qibla directions amongst other things," he said.
Interestingly, Islamic scholars on the other hand have an entirely different opinion. While some scholars say that it is permissible to use the tasvih - digital or otherwise, but they say that it is preferable to count on one's fingers. "Praising the Almighty should not become a show off. It is not prescribed by Islam," said a scholar.
Click on their website austpay.com.
SLIPS was inspired by the slick strategy of the carnivorous pitcher plant, which lures insects onto the ultraslippery surface of its leaves, where they slide to their doom. Unlike earlier water-repelling materials, SLIPS repels oil and sticky liquids like honey, and it resists ice formation and bacterial biofilms as well.
While SLIPS was an important advance, it was also "a proof of principle" -- the first step toward a commercially valuable technology, said lead author Nicolas Vogel, Ph.D., a postdoctoral fellow in applied physics at Harvard SEAS."SLIPS repels both oily and aqueous liquids but it's expensive to make and not transparent," Vogel said.The original SLIPS materials also need to be fastened somehow to existing surfaces, which is often not easy."It would be easier to take the existing surface and treat it in a certain way to make it slippery," Vogel explained.
Vogel, Aizenberg, and their colleagues sought to develop a coating that accomplishes this and works as SLIPS does. SLIPS's thin layer of liquid lubricant allows liquids to flow easily over the surface, much as a thin layer of water in an ice rink helps an ice skater glide.
To create a SLIPS-like coating, the researchers corral a collection of tiny spherical particles of polystyrene, the main ingredient of Styrofoam, on a flat glass surface, like a collection of Ping-Pong balls. They pour liquid glass on them until the balls are more than half buried in glass. After the glass solidifies, they burn away the beads, leaving a network of craters that resembles a honeycomb. They then coat that honeycomb with the same liquid lubricant used in SLIPS to create a tough but slippery coating.
"The honeycomb structure is what confers the mechanical stability to the new coating," said Aizenberg.By adjusting the width of the honeycomb cells to make them much smaller in diameter than the wavelength of visible light, the researchers kept the coating from reflecting light. This made a glass slide with the coating completely transparent.
These coated glass slides repelled a variety of liquids, just as SLIPS does, including water, octane, wine, olive oil, and ketchup. And, like SLIPS, the coating reduced the adhesion of ice to a glass slide by 99 percent. Keeping materials frost-free is important because adhered ice can take down power lines, decrease the energy efficiency of cooling systems, delay airplanes, and lead buildings to collapse.
Importantly, the honeycomb structure of the SLIPS coating on the glass slides confers unmatched mechanical robustness. It withstood damage and remained slippery after various treatments that can scratch and compromise ordinary glass surfaces and other popular liquid-repellent materials, including touching, peeling off a piece of tape, and wiping with a tissue.
"We set ourselves a challenging goal: to design a versatile coating that's as good as SLIPS but much easier to apply, transparent, and much tougher -- and that is what we managed," Aizenberg said.The team is now honing its method to better coat curved pieces of glass as well as clear plastics such as Plexiglas, and to adapt the method for the rigors of manufacturing.
"Joanna's new SLIPS coating reveals the power of following Nature's lead in developing new technologies," said Don Ingber, M.D., Ph.D., the Wyss Institute's Founding Director. "We are excited about the range of applications that could use this innovative coating." Ingber is also the Judah Folkman Professor of Vascular Biology at Harvard Medical School and Boston Children's Hospital, and Professor of Bioengineering at Harvard SEAS.
For years a few shops in Ibrahimpura have been the destination to purchase tasvih. "To keep track of counting people have turned to the beads as they have a particular appeal. However, some are switching over to digital counters," said Mehboob Durrani, owner of one such shop.
These shops once sold prayer beads made of olive seeds, ivory, amber, pearls.Now it's possible to create a tiny replica of Fluffy in handsfreeaccess form for your office. Now all one can find are cheap plastic imitations.We offer the biggest collection of old masters that can be turned into hand painted cleanersydney on canvas. "A digital counter comes for one-third the price of a regular tasvih and many are attracted by it. Earlier it used to be a premium item,Tidy up wires with ease with offershidkits and tie guns at cheap discounted prices.Here's a complete list of granitecountertops for the beginning oil painter. but Chinese made products now start from less than Rs 30," he added.
So could the new digital counter become an alternative to the self-effacing tasvih? Some old-timers like Shakir Ali remind that a similar trend was seen in the 1990's with the introduction of manual counters. "It was just fad which passed away. Digital tasvih could face a similar fate," said Ali.
Entrepreneur Syed Tariq Ibrahim differs, digital tasvih is not the only change that is connecting younger generation to learn more about religion than they would have otherwise. "Trend of using mobile apps has been here for a couple of years now. Youngsters connect to apps to find current namaz timings to qibla directions amongst other things," he said.
Interestingly, Islamic scholars on the other hand have an entirely different opinion. While some scholars say that it is permissible to use the tasvih - digital or otherwise, but they say that it is preferable to count on one's fingers. "Praising the Almighty should not become a show off. It is not prescribed by Islam," said a scholar.
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