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Super-stretchy jelly can take a hit - Mix-and-match hydrogel is most resilient yet.
NATURE NEWS ^
| 05 September 2012
| Katharine Sanderson
Posted on 09/08/2012 2:00:12 PM PDT by neverdem
Your eyes arent deceiving you you just watched a metal ball bounce off a sliver of jelly. But you wouldnt put this jelly in a sherry trifle: it is a sophisticated hydrogel developed by Zhigang Suo, a materials engineer at Harvard University in Cambridge, Massachusetts, and his colleagues1.
A hydrogel is a network of polymers that soaks up lots of water to form a jelly-like material. But most shatter easily and dont stretch far without breaking. Some of the toughest hydrogels are used to make soft contact lenses, and researchers want to make them more robust, for use in replacement cartilage or as scaffolds for growing artificial organs.
Suos hydrogel is made from a mixture of two polymers alginate and polyacrylamide. Each polymer forms networks using different types of chemical bond: alginate molecules are linked together by ionic bonds, and polyacrylamide molecules by stronger covalent bonds. When the gel is stretched, hit or torn, the ionic bonds can break and reform throughout the material, dissipating energy over a wide area and causing fewer of the covalent bonds to be irreversibly ruptured. The covalent bonds hold the material together, allowing it to spring back to its original shape...
(Excerpt) Read more at nature.com ...
TOPICS: Culture/Society; News/Current Events; Technical
KEYWORDS: chemistry; hydrogel; hydrogels; polymerchemistry
A video and abstract are linked.
posted on 09/08/2012 2:00:17 PM PDT
Soooo... Can this be used in superball technology?
posted on 09/08/2012 2:03:06 PM PDT
(Beware the Rip in the Space/Time Continuum)
If this is were to replace the gel found in disposable diapers currently, we could give a whole new meaning to the term “bouncing baby”!
posted on 09/08/2012 2:04:09 PM PDT
(As for me and my house, we will serve the Lord.)
posted on 09/08/2012 2:09:18 PM PDT
(Everything in moderation, however, too much whiskey is just enough... Mark Twain)
or someday maybe bullet resistant clothing?
posted on 09/08/2012 2:09:58 PM PDT
(The Right to Life came before the Right to Pursue Happiness)
There are several research papers on this or very similar, dating back at least 6 years.
posted on 09/08/2012 2:11:49 PM PDT
(Father of LCpl. Karl Linn, KIA 1/26/2005 Al Haqlaniyah, Iraq)
Do not taunt Super Happy Fun Ball!
posted on 09/08/2012 2:29:01 PM PDT
(To the left the truth looks like Right-Wing extremism.)
posted on 09/08/2012 2:34:49 PM PDT
by Joe 6-pack
(Que me amat, amet et canem meum)
posted on 09/08/2012 3:40:25 PM PDT
(Green-eyed lady, lovely lady, strolling slowly towards the sun)
To: Joe 6-pack
Do not taunt Happy Fun Ball.
posted on 09/08/2012 3:54:33 PM PDT
(American Hedonist - *DTOM* -ww- NO Pity for the LAZY)
That stuff looks almost strong enough to prevent Sandra Fluke from getting pregnant.
posted on 09/08/2012 4:59:03 PM PDT
One of the big problems with using any polyacrylamide-based gel in replacement therapy for joints or other membranes is that any un-polymerized acrylamide is a potent neurotoxin. It polymerizes well, but there's always that last little bit embedded that doesn't.
Look for something else to make my new spinal discs from.
posted on 09/08/2012 6:16:06 PM PDT
("a shadow...draped nobly in the folds of a gorgeous eloquence.")
Good ol’ Zhigang. I always had confidence in him and knew that he would come through!
posted on 09/08/2012 8:45:03 PM PDT
(Xin loi min oi)
Are we absolutely sure it’s not okay to eat this stuff?
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