History :

   
Before going into much more detail there hasn't been much history regarding Acoustic Levitation. It was not until recently that experiments have begun to take place.
Leonardo Da Vinci was the first person to discover that sound traveled in waves backing 1500 (AD). Over a hundred years later, Martin Mersenne was the first to measure the speed of sound in air. Over the next 200 years or so many other scientists will contribute to the discovery of sound and further their ideas on the topic. (thescienceclassroom.wikispaces.com)
    The discovery of the "standing wave" is credited Michael Faraday in 1831, when he noticed standing waves on the surfaces of a liquid inside of a vibrating container.

For waves of equal amplitudes traveling in opposing directions, there is on average no net propagation of energy. (en.wikipedia.org)
    Not until recently were objects and liquid suspended against the gravitational force of the earth by only using opposing sound waves. Very recently scientists have used a three-dimensional array of transducers (sound horns) to not only suspend but move small objects in a three-dimensional environment.

Video :

Three-dimensional Levitation

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