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Uses[ edit ] Glow sticks are waterproof, do not use batteries, generate negligible heat, are inexpensive, and are reasonably disposable. Glow sticks are also used to create special effects in low light photography and film. This is advantageous when the second fluorophore would degrade in solution or be attacked by the chemicals. In October , Clarence W. The wavelength of the photon—the color of the emitted light—depends on the structure of the dye. This can be demonstrated by refrigerating or freezing an active glow stick; when it warms up again, it will resume glowing. Hall were registered as inventors of the Chemical Lighting Device Patent 3,,

Finally, students observe the increase in temperature that occurs when the reaction rate of an exothermic reaction is increased. All 5 demonstrations require a total of approximately 15 minutes of preparation and can be performed in approximately 20 minutes.

Then, observe a color change that confirms the presence of a reducing agent in the glow stick.

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Uses[ edit ] Glow sticks are waterproof, do not use batteries, generate negligible heat, are inexpensive, and are reasonably disposable. By mixing the peroxide with the phenyl oxalate ester, a chemical reaction takes place, yielding two moles of phenol and one mole of peroxyacid ester 1,2-dioxetanedione.

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Little, and John H. Bollyky of American Cyanamid , based on work by Edwin A. Cooling a glow stick slows the reaction a small amount and causes it to last longer, but the light is dimmer. This patent recommended a single glass ampoule that is suspended in a second substance, that when broken and mixed together, provide the chemiluminescent light. This also allows design of glow sticks that perform satisfactorily in hot or cold climates, by compensating for the temperature dependence of reaction. By mixing the peroxide with the phenyl oxalate ester, a chemical reaction takes place, yielding two moles of phenol and one mole of peroxyacid ester 1,2-dioxetanedione. Use glow sticks to observe and understand redox reactions, reaction rates, and exothermic reactions.

Lyons listed as the inventors Patent 3, The same effect can be achieved by adding copious amounts of sodium salicyate or other bases. It is rarely used, as it breaks down in contact with CPPOshortening the shelf life of the mixture.

They are used as light sources and light markers by military forcescampersand recreational divers. Manipulating the reaction rate of the glow stick components by varying the temperature and the pH can increase or decrease the intensity of light produced, and students use their understanding of reaction rate mechanisms to explain these results.

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Learn how to distinguish between chemiluminescence and fluorescence. At maximum concentration typically only found in laboratory settingsmixing the chemicals results in a furious reaction, producing large amounts of light for only a few seconds. The chemicals inside the plastic tube are a mixture of the dye, the base catalyst, and diphenyl oxalate.

The reaction between the two chemicals is catalyzed by a base, usually sodium salicylate. They can tolerate high pressures, such as those found under water.

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China 1′′ Glow Sticks Tip Float Night Fishing Light