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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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Choose another substance to add to the fourth vial.

Variety of educational materials on nanoscience and nanotechnology including slides and short videos from the Materials Research Science and Engineering Center at the University of Wisconsin, Madison: Vary the volume of water in the bottle and the tone of the sound changes.

Predict whether the color of the colloid will change. Each nanoparticle is made of many more thanCollr atoms.

The tone is dependent on the volume of water. Give possible reasons for any differences. The system you worked with in this namoworld involves huge numbers of nanoparticles.

Predict whether the addition of each solution to the colloid will affect the size of the gold nanoparticles. After the solution begins nanowordl boil, add 2 mL of By understanding these properties and learning how to utilize them, scientists and nanoworlf can develop new types of sensors and devices. Very good resource for all levels of education from the National Science Foundation: Similarly, the volume and shape of a nanoparticle determines how it interacts with light.


Nanoscience investigates the properties of these materials. Add a magnetic stir bar.

A nice nanoworrld to nano, and more: Check with your instructor about your choice. How might scientists be able to detect individual nanoparticles? Recall that the gold nanoparticles in the colloid are negatively charged. Pour 20 mL of 1.

Accordingly, this determines the color of a nanoparticle solution. You will explore how the size of the gold nanoparticles can be changed and how changing their size Left: Gloves should be worn when nanowold with the nanoparticle solution. 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. Physical and chemical properties are size-dependent over a certain size range nahoworld to the material and property.

Into each vial, place 3 mL of the gold nanoparticle solution you prepared in Part A. In a small container, dissolve 0. A colloid is distinguished from other types of suspensions by the smallness of the particles —so small that they do namoworld separate from the continuous phase due to gravity.

For example, while a large sample of gold, such as in jewelry, appears yellow, a solution of nano-sized particles of gold can appear to be a wide variety of colors, depending on the size of the nanoparticles.

Color My Nanoworld

Excess citrate anions in solution stick to the Au metal surface, giving an overall negative charge to each Au nanoparticle. This technology could have a huge impact on diagnosing diseases, processing and storing nanowogld, and other areas. If they were smaller, they would not be a separate phase; they would be part of a solution. Continue to boil and stir the solution until it is a deep red color about 10 min.


One suggestion is a household liquid such as vinegar. Add 3 mL distilled water to each vial. The sodium citrate reduces the Au ions to nanoparticles of Au metal. Darkfield image and AFM image of How could the effect in part B be mg to detect the binding of biomolecules, such as DNA or antibodies, that stick to one another or to other molecules?

Color My Nanoworld

When a particle of gold metal nanowofld similar in size to wavelengths of visible light — nmit interacts with light in interesting ways. Think back to the DNA-coated gold nanoparticles described in the Introduction. The color of a gold nanoparticle solution depends on the size and shape of the nanoparticles.

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. Based on the fact that the citrate anions cover the surface of each nanoparticle, explain what keeps the nanoparticles from sticking together aggregating in the original solution.