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Save your breath: A new way of making bubbles only requires sound waves.
Scientists made the bubbles into levitating liquid drops, held in the air by sound waves. Twisting sound waves caused the fall to hover in a bubble.
The team formed the bubbles using a variety of liquids, including water. The increase in sound intensity causes the liquid to initially bend into a concave shape. Then, the sound waves resonated in the newly formed droplet cavity, causing the liquid film to expand rapidly until it closed on itself in a hollow bubble, researchers report on September 11th. Nature Communications.
Despite their reputation as a child's toy, bubbles are a serious business. They play an important role in the manufacturing processes of food, pharmaceutical, cosmetic and ultra-light products. Thus, a new technique of creating bubbles could find applications in the industry.
The scientists suspended the drops of liquid using a well-established technique called acoustic levitation. In the method, the pressure of intense sound waves is used to hold small objects and even to move them (SN: 8/24/13, p. ten).
Floating bubbles last surprisingly long – tens of minutes. As children know, a bubble of soap placed on a stick only retains a short time before the soapy solution flows to the bottom of the bubble andSN: 1/21/17, p. 32). But levitation slows the drainage of the liquid, which delays the bursting of the bubble.
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A BIRTH BIRTH A droplet of liquid suspended in the air is transformed into a bubble in this experiment. The sound waves retain the fall and the increase of the intensity of the waves causes deformation and the formation of a bubble. |
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