Everything about dyes and dying


Chemiluminescence

A glow stick is a sheer plastic tube that
produces a brilliant light. A glowstick isThe outer compartment of the tube contains a
also known as glow tube or light stick ormixture of the dye and a derivate of phenyl
glow  light  stick.oxalate ester (cyalume) and the inner brittle
part contains concentrated hydrogen peroxide.
A glow stick is typically a plastic
cylindrical rod about four or five inches (10A ferocious reaction takes place on mixing
to 13 cm) long and less than an inch (2.5 cm)the peroxide with the phenyl oxalate ester.
in diameter. The transparent stick containsThe ester is oxidized, giving out 2 molecules
two chemical fluids in two differentof phenol and 1 molecule of peroxyacid ester.
compartments. The outer compartment of theThe peroxyacid decomposes spontaneously to
tube carries one chemical fluid and the innercarbon dioxide, releasing energy that excites
compartment carries the other. The innerthe dye that then de-excites by releasing a
compartment is brittle either made of glassphoton. The wavelength of the photon depends
or  brittle  plastic.on  the  structure  of  the  dye.
The inner brittle part breaks on bending theDifferent dyes can be used to produce
glowstick and helps inter mingling the twodifferent color lights. The 9,10-bis
chemical fluids. A fierce chemical reaction(phenylethynyl) anthracene gives green light,
takes place emitting bright light but not9,10-diphenylanthracene emits blue light,
necessarily  heat.5,6,11,12-tetraphenylnaphthacene emit red
light. The glowsticks dyes usually emit
The glowsticks are used in the military,fluorescent light when exposed to ultraviolet
recreational driving at night, marching bandsradiation. Therefore even a spent glowstick
at night, entertainment parties, raves,shines  under  a  black  light.
concerts, dance clubs, Halloween eves etc.
The glowsticking is the use of glowsticks inThe other chemicals used in glow sticks may
dance.include sodium salicylate as a catalyst, bis
(2-ethylhexyl) phthalate (DCHP) as a solvent,
Chemistry:bis (phenyl) oxalate, bis
(2,4,5-trichlorophenyl-6-carbopentoxyphenyl)
The phenomenon of the chemical reaction inoxalate  (CPPO).
the glow sticks is known as
chemiluminescence. The chemicals used toThe chemical reaction gets accelerated on
create the reaction in glow sticks areheating a glow stick and the glowstick glows
usually hydrogen peroxide and a mixture ofbrighter, but for a shorter span. The cooling
phenyl oxalate ester and the fluorescent dye.on the contrary decelerates the reaction that
The fluorescent dye gives the glow stick itshelps a sick glow longer, but dimmer.
color.



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