螢光棒
维基百科，自由的百科全书
螢光棒，英文:lightstick或 glowstick, 是一種以內外管各別分裝兩種液體化學成份的透明塑膠棒。 當螢光棒被彎曲時，它內層的管子會破掉而使兩種化學液體混合在一起產生化學作用而放出光能，但它並不會產生熱能。這個過程被稱為化學螢光反應。
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[编辑] 使用
Lightsticks have various purposes: they are used in the military, by recreational divers doing night diving, by marching band conductors for night time performances, and also used for entertainment at parties (especially raves), concerts, and dance clubs. Glowsticking refers to the use of glowsticks in dancing. A further application are light effects, especially Balloon-carried light effects.
By adjusting the concentrations of the two chemicals, manufacturers can produce lightsticks that either glow brightly for a short amount of time, or glow more dimly for a much longer amount of time. At maximum concentration (typically only found in laboratory settings), mixing the chemicals results in a furious reaction, producing large amounts of light for only a few seconds.
Heating a lightstick causes the reaction to proceed faster and the lightstick to glow brighter, but for a shorter period of time. Cooling a lightstick slows the reaction and causes it to last longer, but the light is dimmer. This can be demonstrated by refrigerating or freezing an active glowstick; when it warms up again, it will resume glowing .
[编辑] 化學原理
The light stick contains two chemicals and a suitable fluorescent dye (sensitizer, or fluorophor). The chemicals in the plastic tube are a mixture of the dye and a derivate of phenyl oxalate ester (also called Cyalume). The chemical inside the glass vial is concentrated (about 35%) hydrogen peroxide. By mixing the peroxide with the phenyl oxalate ester, a chemical reaction takes place; the ester is oxidized, yielding two molecules of phenol and one molecule of peroxyacid ester. The peroxyacid decomposes spontaneously to carbon dioxide, releasing energy that excites the dye, which then deexcites by releasing a photon. The wavelength of the photon depends on the structure of the dye; eg. 9,10-bis(phenylethynyl)anthracene gives green light, 9,10-diphenylanthracene yields blue light, 5,6,11,12-tetraphenylnaphthacene yields red light. Other colors can be made of combination of dyes, eg. purple requires three dyes.
Other chemicals are usually present in the mixture as well; eg. sodium salicylate as a catalyst, and Bis(2-ethylhexyl) phthalate (DEHP) as a solvent.
Instead of cyalume, bis(2,4,5-trichlorophenyl-6-carbopentoxyphenyl)oxalate (CPPO) is used in practical formulations, as it gives significantly better quantum yield.
A similar reaction can be achieved with bis(2,4,6-trichlorophenyl)oxalate (TCPO).
The dyes used in lightsticks usually exhibit fluorescence when exposed to ultraviolet radiation. Therefore even a spent lightstick will shine under a black light.
[编辑] 螢光劑
- 9,10-diphenylanthracene (DPA) emits blue light
- 1-chloro-9,10-diphenylanthracene (1-chloro(DPA)) and 1-chloro-9,10-diphenylanthracene (2-chloro(DPA)) emit blue-green light with higher efficiency than unsubstituted DPA, dihydro(DPA) is purple [1]
- 9,10-bis(phenylethynyl)anthracene (BPEA) emits green light
- 1-chloro-9,10-bis(phenylethynyl)anthracene emits yellow-green light, used in 30-minute high-intensity Cyalume sticks
- 2-chloro-9,10-bis(phenylethynyl)anthracene emits green light, used in 12-hour low-intensity Cyalume sticks
- 1,8-dichloro-9,10-bis(phenylethynyl)anthracene emits yellow light, used in Cyalume sticks
- Rubrene emits orange-red light.
- 2,4-di-tert-butylphenyl 1,4,5,8-tetracarboxynaphthalene diamide emits deep red light, together with DPA is used to produce white or hot-pink light, depending on their ratio
<圖片> Image:9,10-diphenylanthracene.png|9,10-diphenylanthracene yields blue light Image:9,10-bis(phenylethynyl)anthracene.png|9,10-bis(phenylethynyl) anthracene yields green light Image:1-chloro-9,10-bis(phenylethynyl)anthracene.png|1-chloro- 9,10-bis(phenylethynyl) anthracene yields yellow light Image:rubrene.png|rubrene (5,6,11,12-tetraphenyl naphthacene) yields yellow light Image:5,12-bis(phenylethynyl)naphthacene.png|5,12-bis(phenylethynyl) naphthacene yields orange light Image:Rhodamine 6G.png|Rhodamine 6G yields orange light Image:Rhodamine B.png|Rhodamine B yields red light </gallery>
[编辑] 歷史
Cyalume was invented by Michael M. Rauhut and Laszlo J. Bollyky of American Cyanamid based on work by Edwin A. Chandross of Bell Labs. 1
Other early work on chemoluminescence was carried out at the same time, by researchers under Herbert Richter at China Lake Naval Weapons Center. 2 3
