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In this activity, students are introduced to the unique properties of nanoscale materials. The activity begins with the synthesis of 13 nm-diameter gold nanoparticles by reduction of a gold salt. The students use the resulting nanoparticle solution to explore the size-dependent optical properties of gold nanoparticles. Specifically, they determine that the nanoparticle solution functions as an electrolyte sensor because electrolyte-induced aggregation of the nanoparticles results in a dramatic color change.
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McFarland et al. (2004) studied this question.
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