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prevail on to your wand , Harry Potter : Science has outdone even your best " Leviosa ! " levitation go .
Researchers report that they have levitated objects with sound waves , and moved those object around in midair , according to a new study .
A new technique uses sound waves to levitate objects and move them in mid-air
scientist have used sound wave to freeze objects in midair for decades , but the unexampled method , describe today ( July 15 ) in the diary Proceedings of the National Academy of Sciences , goes a step further by allowing people to manipulate suspended objects without touching them .
This levitation proficiency could help create ultrapure chemical miscellanea , without contamination , which could be utilitarian for making radical cadre or other biological materials .
parlour trick
For more than a century , scientist have proposed the idea of using the pressure of sound waves to make object drift in the air . As legal wave journey , they produce change in the breeze pressure — squishing some air corpuscle together and pushing others apart .
By place an object at a certain point within a wakeless wave , it ’s possible to perfectly countervail the force of gravity with the force exerted by the auditory sensation wave , allowing an object to float in that spot .
In previous work onlevitation system of rules , investigator had used transducers to produce phone waves , and reflectors to reflect the wave back , thus creating standing waves .
" A standing waving is like when you pluck the cosmic string of a guitar , " said study co - author Daniele Foresti , a mechanical engineer at the ETH Zürich in Switzerland . " The string is moving up and down , but there are two points where it ’s sterilise . "
Using these digest waves , scientistslevitated miceand small drops of liquid .
But then , the research got stuck .
acoustical levitation seemed to be more of a parlor trick than a useful tool : It was only knock-down enough to hover comparatively small object ; it could n’t levitate liquids without splitting them apart , and the object could n’t be actuate .
Levitating liquids
Foresti and his colleagues designed tiny transducer powerful enough to levitate objective but small enough to be pack intimately together .
By slowly turning off one transducer just as its neighbor is ramping up , the newfangled method creates a moving seraphic spot for levitation , turn on the scientist to move an objective in midair . Long , skinny object can also be levitated .
The novel organisation can lift heavy target , and also put up enough control so that liquids can be merge together without split up into many tiny droplet , Foresti said . Everything can be controlled automatically .
The organization blasts vocalize wave at what would be anear - splitting noise levelof 160 decibels , about as loud as a fountain require off . luckily , the sound waves in the experimentation operate at 24 kilohertz , just above the normal hearing kitchen stove for humans .
However , " if you have some click around , they are not go to like it at all , " Foresti tell apart LiveScience .
mighty now , the objects can only be moved along in one proportion , but the research worker desire to develop a system that can move aim in two dimensions , Foresti said .
Major advance
The raw arrangement is a major forward motion , both theoretically and in terms of its practical applications , said Yiannis Ventikos , a fluid investigator at the University College London who was not involved in the field of study .
The new method could be an alternative to using a pipet to mix fluid in instances when pollution is an issue , he added . For instance , acoustical levitation could enable researchers to marinatestem cellsin certain precise chemical substance mixtures , without worry about contamination from the pipette or the well tray used .
" The level of control you get is quite astounding , " Ventikos said .
