An antibubble is a droplet of
liquidsurrounded by a thin film of gas, as opposed to a gas bubble, which is a sphere of gas surrounded by a thin film of liquid. Antibubbles are formed when liquid drops or flows turbulently into the same or another liquid. They can either skim across the surface of a liquid such as water, in which case they are also called water globules, or they can be completely submerged into the liquid to which they are directed.
Antibubbles are a common but widely unrecognised
phenomenon, in part because of their resemblance to air bubbles, and in part because of their typically transientnature. With certain ( soapy) solutions, they can be made to last much longer.
The behavior of antibubbles differs from that of air bubbles in three primary ways, and provides a ready means of identification:
* Antibubbles are held in place by
surface tension, and move rapidly across the surface of the water. They can also be seen to ricochet off other objects in the water (such as air bubbles) and off the sides of a container in a manner similar to that of billiard balls.
* Under ordinary circumstances, antibubbles are short-lived. An air bubble with a soap skin may last several minutes. Antibubbles often have lifetimes of a few seconds or less; however, if the
electrical potentialbetween the inner and outer fluid is equalized, antibubbles can last as long as, or longer than, air bubbles.
refractlight in a different manner than air bubbles. Because they are water droplets, light entering them is refracted back toward its source in the same manner as rainbows are produced. Because of this refraction, antibubbles have a bright appearance.
Antibubbles are easily created by allowing a tap to drip into a container of water to which a drop or two of soap has been added. The soap reduces the water's surface tension and allows the skin of air surrounding the droplet to remain in place for more than just a fraction of a second.
soap bubbles, with air inside and air outside, have negative buoyancyand tend to sink towards the ground, so antibubbles, with water inside and water outside, have positive buoyancy and tend to rise towards the water surface. But again, just as soap bubbles can be filled with a lighter gas to give them positive buoyancy, so antibubbles can be filled with a heavier liquid to give them negative buoyancy. Using a drinking strawto drop droplets of sugarsolution onto soapy water will produce antibubbles that sink.
Antibubbles usually pop when they touch the bottom or the side of the vessel containing the liquid. This can be prevented by tipping a few teaspoons of sugar into the soapy water and giving it some time to dissolve (but without stirring it). This will produce a denser layer of sugary water at the bottom of the container. Antibubbles made from sugar solution will then sink through the water and rest on top of the denser layer at the bottom. Antibubbles made this way can last for several minutes.
Potential uses for antibubbles
If antibubbles can be stabilized they can be used to form a long lasting froth — antifoam. Possible uses for antifoam are as a
lubricantor leveraging the thin passageways permeating antifoam as a filter for air or other gasses.
Antibubbles themselves could be used for chemical processes such as removing pollutants from a smokestack. Replacing the air in antibubble shells with another liquid could be used for a drug delivery system by creating a shell of liquid-
polymeraround a drug. Hardening the polymer with ultravioletlight would create a drug filled capsule.
* [http://www.antibubble.com antibubble.com]
* [http://www.hot-streamer.com/antibubbles www.hot-streamer.com/antibubbles]
* [http://www.antibubble.org Antibubble.org]
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Look at other dictionaries:
Antibubble — Antibulle Gouttelettes en train de glisser sur la surface Une antibulle est une goutte de liquide entourée d un fin film de gaz, contrairement aux bulles de savon qui sont du gaz prisonnier d une mince couche de liquide. Les antibulles se forment … Wikipédia en Français
antibubble — … Useful english dictionary
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Antibläschen — existieren ausschließlich innerhalb von Flüssigkeit und bestehen aus einer kugelförmigen Menge Flüssigkeit, umgeben von einer Membran aus Luft. Sie wurden bislang erst einmal wissenschaftlich erforscht. Die belgischen Wissenschaftler Stéphane… … Deutsch Wikipedia
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Globule — can refer to:* Bok globule * Molten globule * Globule (CDN) * Drop (liquid) ** Antibubbles of liquid on top of a surface of liquid … Wikipedia