Session S55a (Monday, 5:15pm, Willaman Gateway)

P344: Observation of the Tyndall effect in metal nanoparticle solutions - WITHDRAWN

Nak Han Jang (Kongju National University, Korea)

It is very effective to explain the Tyndall effect for high school students using metal nanoparticle solutions because the size of particle can be diversely regulated in solution. I have prepared gold and silver nanoparticle solutions to explain the Tyndall effect for Korean high school students and have explained the dependence on the size of nanoparticles and the wavelength of an incident light. In a pure silver nanoparticle solution, the Tyndall effect was observed on both green (530nm) and red (670nm) light. But for a pure gold nanoparticle solution, the Tyndall effect was only observed on red light whereas it was almost not observed on green light. According to an increasing size of nanoparticles, the Tyndall effect was weakly observed on both green and red light. However, there was a little difference between gold and silver nanoparticle solution. The Tyndall effect was shown in gold solution much stronger than in silver solution for both green and red light. From UV spectra of these nanoparticle solutions, this phenomenon could be attributed to the regularity of metal nanoparticles in solution. Namely, the regularity of gold nanoparticles was more constant than silver nanoparticles as a nanoparticle was aggregated by an adsorbate. The Tyndall effect was affected on the size of metal nanoparticles, the wavelength of an incident light and the regularity of metal nanoparticles in solution. Accordingly, this is educationally implicative because high school students can visually understand the relationship between the size of particle in solution and the wavelength of an incident light using metal nanoparticle solutions in the Tyndall effect.

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