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Questions and Answers
UV20488 enhances the perceived whiteness of materials due to its ability to:
UV20488 enhances the perceived whiteness of materials due to its ability to:
- Absorb all wavelengths of light, except those in the green spectrum.
- Convert ultraviolet light into blue light, increasing the material's brightness. (correct)
- Increase the material's surface area, which scatters more light.
- React chemically with impurities, removing yellow casts from the material.
Which of the following is a primary characteristic of UV20488 that makes it useful as a tagging agent and chemical tracer?
Which of the following is a primary characteristic of UV20488 that makes it useful as a tagging agent and chemical tracer?
- Its magnetic properties that allow it to be easily tracked.
- Its ability to dissolve in water at high concentrations.
- Its chemical inertness and non-reactivity with other substances.
- Its strong fluorescence when exposed to UV light. (correct)
In what applications would the photostability of UV20488 be most important?
In what applications would the photostability of UV20488 be most important?
- Detergents used for cleaning fabrics.
- Security inks designed to detect counterfeiting.
- Textiles used for clothing that will be frequently exposed to sunlight. (correct)
- Paper products stored indoors with minimal light exposure.
UV20488 is synthesized through condensation reactions. What is the most likely purpose of these reactions in the context of dye synthesis?
UV20488 is synthesized through condensation reactions. What is the most likely purpose of these reactions in the context of dye synthesis?
Which application method would be most suitable and cost-effective for adding UV20488 to a large batch of paper during its manufacturing process?
Which application method would be most suitable and cost-effective for adding UV20488 to a large batch of paper during its manufacturing process?
Flashcards
UV20488
UV20488
A fluorescent dye from the benzoxazole class, used to enhance whiteness in detergents and other materials.
UV20488's excitation maximum
UV20488's excitation maximum
Approximately 370 nm.
UV20488's emission maximum
UV20488's emission maximum
Approximately 430 nm, emitting strong blue fluorescence.
UV20488 applications
UV20488 applications
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UV20488's chemical structure
UV20488's chemical structure
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Study Notes
- UV20488 is a fluorescent dye.
- It belongs to the class of benzoxazole optical brighteners.
- UV20488 is used as a fluorescent whitening agent in detergents.
- It can also be used as a tagging agent and as a chemical tracer.
- The dye is soluble in many organic solvents.
- UV20488 has a high quantum yield.
- It has good photostability.
- It is compatible with many polymers and substrates.
- UV20488 exhibits strong fluorescence in the blue region.
- Its excitation maximum is around 370 nm.
- Its emission maximum is around 430 nm.
- The dye is used in applications like textiles, paper, and plastics.
- It is also employed in security inks to detect counterfeiting.
- UV20488 can be detected under UV light.
- It is considered environmentally safe in appropriate concentrations.
- The chemical structure includes benzoxazole rings and a stilbene bridge.
- UV20488 is considered an anionic brightener.
- Molecular weight of UV20488 is around 430-460 g/mol depending on counterion for sulfonate groups
- It is stable under normal storage conditions.
- The dye is synthesized by condensation reactions.
- It can be applied through various methods like padding, exhaustion, and coating.
- UV20488 enhances the perceived whiteness and brightness of materials.
- The dye's effectiveness depends on the substrate and application method.
- It provides a cost-effective solution for enhancing visual appeal.
- UV20488 may undergo degradation upon prolonged exposure to intense UV radiation.
- It is important to follow recommended dosage levels
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Description
UV20488 is a benzoxazole optical brightener used in detergents and as a tagging agent. It exhibits strong blue fluorescence with excitation at 370 nm and emission at 430 nm. Applications include textiles, paper, plastics, and security inks for anti-counterfeiting.
