Sample Student Activity Color My Nanoworld One nanometer is 10, times smaller than the diameter of a human hair. Can you imagine producing and using . Color My Nanoworld One nanometer is 10, times smaller than the diameter of a human hair. Can you imagine producing and using nanometer-sized. Color My Nanoworld. This Activity introduces students to the unique properties of nanoscale materials through exploration of size-dependent optical properties.

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This prevents them from aggregating, i.

Using a clean dropper, add 5—10 drops, one at a time, of the sugar solution from part B, step 4 to the sugar-labeled vial. Pour 20 mL of 1. With a dropper, add 5—10 drops, one at a time, of the salt solution from part B, step 3 to the salt-labeled vials. In a small container, dissolve 0. Gloves should be worn when working with the nanoparticle solution.

In other words, they do not settle to the bottom or rise to the top. If they were smaller, they would not be a separate phase; they would be part of a solution. What is happening to the nanoparticles in solution? Give possible reasons for any differences.

Color My Nanoworld | Chemical Education Xchange

Accordingly, this determines the color of a nanoparticle solution. Citrate anions cover the nanoparticle surface.


Add a magnetic stir bar. When the solution is a deep red color, turn off the hot plate and stirrer.

A colloid is distinguished from other types of suspensions by the smallness of the particles —so small that they do not separate from the continuous phase due to gravity. Give reasons for your predictions. Continue to boil and stir the solution until it is a deep red color about 10 min.

Think about the composition of each solution that will be added to the gold colloid: Award-winning site; sort of an introductory science and technology encyclopedia with an emphasis on nano: If substances other than salt and sugar are added to the nanoparticle solution, dispose of the nanoparticle solution using methods appropriate for solutions containing those substances.

Color My Nanoworld

Before adding the substance, predict whether or not a color change will occur. Excess citrate anions in solution stick to the Au metal surface, giving an overall negative charge to each Au nanoparticle.

As the solution boils, add distilled water as needed to keep the total solution volume near 22 mL. Spin polarized transport in semiconductors — Challenges for.

A nice intro to nano, and more: Choose another substance to add to the fourth vial. Check with your instructor about your choice. How could these molecules be used to cause aggregation of the nanoparticles?


Can you imagine producing and using nanometer-sized materials? Recall that the gold nanoparticles in the colloid are negatively charged. The sodium citrate reduces the Au ions to nanoparticles of Au metal.

This technology could have a huge impact on diagnosing diseases, processing and storing information, and other areas. Predict whether the addition of each colkr to the colloid will affect the size of the gold nanoparticles.

Purpose of the Post. The gold nanoparticles are covered with citrate anions. Why does adding the salt solution produce a different result from adding the sugar solution? How does the solution visibly change? Effects of p-doping on the thermal sensitivity of.

Color My Nanoworld

As a suspension, a colloid is one phase of matter in this case, a solid—gold dispersed in another phase in this case, a liquid. Into each vial, place 3 mL of the gold nanoparticle solution you prepared in Part A. The color of a gold nanoparticle solution depends on the size and shape of the nanoparticles.

Think back to the Nanoworrld gold nanoparticles described in the Introduction.