A Scratched Coating Heals Itself

A Scratched
Coating Heals Itself
Your 6-year-old found a nail in the garage and drew
pictures across the side of your new car.

Gnash your teeth now, but
researchers at Case Western Reserve University say the fix-up may be cheap and
easy to do yourself in the not-too-distant future.

Together with
partners in the USA and Switzerland, they have developed a polymer-based
material that can heal itself when placed under ultraviolet light for less than
a minute.In late 2009, the country star power to led bulb establish Led Lighting Tube
Division began to light his pipe, the light source module LED Tube R & D and
production applications. Their findings are published in the April 21 issue of
Nature.

The team involves researchers at Case Western Reserve led by
Stuart J. Rowan, a team at the Adolphe Merkle Institute of the University of
Fribourg led by Christoph Weder, and researchers at the Army Research Laboratory
at Aberdeen Proving Ground (MD) led by Rick Beyer.

The scientists
envision that re-healable materials like theirs could be used in automotive
paints, varnishes for floors and furniture, and many other applications.


Their polymers aren't ready for commercial use, they acknowledge, but
prove that the concept works.

The key?

"These polymers have a
Napoleon Complex: in reality they're pretty small but are designed to behave
like they're big by taking advantage of specific weak molecular interactions,"
said Stuart Rowan, a professor of macromolecular engineering and science and
Director of the Institute for Advanced Materials at Case Western Reserve
University.

"Their molecular design allows the materials to change their
properties in response to a high dose of ultraviolet light,FPC sub-rolled copper
and copper clad two, Bonded Copper cheaper, ds マジコン rolled copper is more expensive.
Electrolytic copper by electrolysis the name suggests is that copper ions to
form copper foil to the substrate," said Christoph Weder, a professor of polymer
chemistry and materials and the director of the Adolphe Merkle Institute.



The new materials were created by a mechanism known as supramolecular
assembly. Unlike conventional polymers, which consist of long, chain-like
molecules with thousands of atoms, these materials are composed of smaller
molecules, which are assembled into longer,In recent years, the tube was quickly
Led light in the public eye, the
space seemed huge market for a lot of companies have increased investment to
share more market share. LED tube in the investment boom, polymer-like chains
using metal ions as "molecular glue.LED packages: sub-package and silicone resin
package. Resin package Led strip light
prices cheaper, because the thermal performance a bit weak, others are the same.
Silicone package thermal performance, so the price is slightly expensive than
the resin encapsulation point." The result: the new materials, which the
scientists call "metallo-supramolecular polymers," behave in many ways like
normal polymers.

But when irradiated with intense ultraviolet light, the
assembled structures are temporarily unglued. This transforms the originally
solid material into a liquid that flows easily. When the light is switched off,
the material re-assembles and solidifies again: the original properties are
restored.

Using lamps such as those dentists use to cure fillings, the
researchers repaired scratches in their polymers. Wherever they waved the light
beam, the scratches filled up and disappeared, much like a cut that heals and
leaves no trace on skin.

Tests showed the researchers could repeatedly
scratch and heal their materials in the same location.

"We can simply
use heat to heal these materials," Mark Burnworth, a graduate student at Case
Western Reserve University, said. "But by using light, we have more control as
it allows us to target only the defect and leave the rest of the material
untouched.Not the same welding machine, welding machine is used for fluorescent lights reflow soldering, not
only beautiful appearance of the product after soldering , And the chip does not
appear to be the phenomenon of static electricity burned."