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Related Experiment Videos

Hartley's fractional crystallization and Weigert's effect.

Tariel D Ebralidze1, Nadia A Ebralidze

  • 1Institute of Cybernetics, Georgian Academy of Sciences, 5, Sandro Euli Street, Tbilisi 10086, Georgia. tariel@cybern.acnet.ge

Applied Optics
|March 11, 2004
PubMed
Summary

During slow evaporation, chrysophenine dye in gelatin formed yellow and blue crystals. Blue crystals disintegrated when exposed to non-polarized light, indicating light sensitivity.

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Area of Science:

  • Materials Science
  • Crystallography
  • Photochemistry

Background:

  • Gelatin-water solutions saturated with azo-dye chrysophenine were studied.
  • Crystal formation during slow evaporation is a known phenomenon.

Purpose of the Study:

  • To investigate the crystalline structures formed from chrysophenine-saturated gelatin.
  • To observe the optical properties and light sensitivity of these dye crystals.

Main Methods:

  • Slow evaporation of a gelatin-water solution saturated with chrysophenine dye.
  • Observation of crystal formation and interference colors.
  • Exposure of crystals to non-polarized light from a mercury lamp.

Main Results:

  • Two distinct interference colors, yellow and blue, were observed in the gelatin matrix.

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  • Crystals exhibiting blue interference color showed disintegration upon exposure to non-polarized mercury lamp light.

    • Conclusions:

    • Chrysophenine dye can form crystals with different optical properties within a gelatin matrix.
    • The blue-interfering crystals are photosensitive and degrade under non-polarized light exposure.