Full activity can be found here:
Zinc oxide quantum dot nanoparticles absorb UV light but are optically transparent making them useful as the active ingredient of sunscreens. The absorption wavelength is a function of particle size when the particles are small. This synthesis involves particle growth at 65°C; samples removed at longer times give larger particles. The cut-off wavelength from the absorption spectra can be used to estimate the particle size.
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The NSF-sponsored Wisconsin Materials Research Science and Engineering Center brings together teams of interdisciplinary researchers to address grand challenges in materials science.
The Wisconsin MRSEC has free, engaging educational activities for a variety of audiences.