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Scientists have found a molecule that can spin freely in liquid, clearing out water like a person swinging suitcases would clear a crowded room.
The molecule spins without causing friction [Video]. That shouldn't be possible, according to a chemical physics theory. The finding could alter the way scientists think about chemical reactions in liquids.
Researchers hit a drop of iodine cyanide and water with pulses from an ultraviolet laser, exciting one type of molecule to reconfigure into a small, peanut shape with a carbon atom on one end, a nitrogen atom on the other.
The molecule heated up to 8,000 degrees Fahrenheit (4,427 Celsius) and started spinning at a furious 270 trillion rotations per minute.
Within the first quarter-turn, the molecule created a shock wave that kicked away surrounding water molecules. The peanut molecule created a nearly frictionless zone for itself in the 10-trillionths of a second the reaction lasted.
"If you give it enough spin, it pushes all the guys around it away, and it builds itself a little bubble," said study coauthor Stephen Bradforth of the
After the molecule completed about 10 rotations, the shock dwindled and the water molecules rushed back in.
Despite its fleeting nature, the reaction managed to smash the linear response theory, a chemistry model that states such a thing can't happen in a liquid environment.
"You can see molecules behave this way in gases, but not in liquids," said study coauthor Richard Stratt, a chemical theorist at
Breaking other laws
The molecule's activity also runs against
Friction is important in chemistry. Molecules rub, grind, and bang against each other they generate heat that speeds up reactions. Friction in gas reactions is reduced due to the relatively far distances between molecules, but the close proximity of molecules in liquid form makes friction nearly unavoidable.
Although the discovery has no immediate practical use, it changes the way scientists think about the 90 percent of all chemical reactions that take place in liquid, Bradforth said. One potential use could be to manipulate reactions by isolating molecules from their surroundings and reducing the production of useless byproducts.
CONTROVERSY: IIT-JEE (NEW PATTERN)
This year 3-lakh students appeared for iit jee exam, the exam which is considered as one of the most mind-boggling exams around the globe. This number is 1.02-lakh more than that of last year. Over 3-lakh students will battle out for just 4935 seats across 7 iit's. The jee examination is to be held across 116 centres in India.
Ironically the reason for increase in this huge competition is the change in pattern, the pattern reduced to relieve stress among the students. instead of two-phase examination conducted till 2005, the iit-jee has been a single day's test consisting of three papers namely physics chemistry and mathematics, each of two hours. The requirements for appearing this examination is 60% or above marks in H.S.C. examination .
Another change is that there will be 3 marks for correct answer and there will be 0.33 negative-marking for every wrong answer. the candidate will be given only two attempts to crack the examination.
The students this year were not at all active. Any Tom Dick and Harry would appear the exam just to test their luck or with the impression that the paper would be very easy to crack.
Thats all about jee-2006 .................listen to the further story..................just scroll down and don't forget to give your poll and also dont forget to leave your comments.
CONTROVERSY: FAKE ATTEMPT
Listen to this....Smita M. walked out of the joint entrance exam with a smile on her face. No, she hadn't been confident that she would cracked iit-jee....but just because she made some money just by getting the iit-jee paper out for the coaching classes to publish and for private circulation. There were many students like Smita who did not even breathe the word iit but had just attempted to make money. Even a few young faculty member's did the same.
It was very simple, the chosen candidate had to go to the examination hall, and with the reason for toilet or something else slip out of the class with the Q-paper and never return back again. this was done so because the iit's didn't allow the Q-paper's with the new pattern to get out in view.
Many of the coaching-classes had published the question paper on their respective websites.
Give your poll and comments and keep visiting for more CONTROVERSIES.............
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