Report: Nanotechnology
On my honor, in preparing this report, I know that I am free to use references and consult
with others.
Hopefully here for the Report Form
Note: In preparing this report you are free to use references and consult with others.
However, you may not copy from other students’ work (including your laboratory
partner) or misrepresent your own data (see honor code).
Name(Print then sign): ___________________________________________________
Lab Day: ___________________Section: ________TA__________________________
Part I. Demo of Gold Nanoparticles
HAuCl 4 solution?
1.
What was the starting color of the
2.
What was the beginning oxidation state of Au?
3.
What was the ending oxidation state of Au?
4.
What is the purpose of the sodium citrate solution?
5.
What is the total surface area of 3 g of 5 nm gold particles assuming gold has a density of
9.3g / cm 3 ?
6.
What is the total surface area of 3 g of 5 micrometer gold particles assuming gold has a density of
9.3g / cm 3 ?
Part II. Synthesis of an Aqueous Ferrofluid
7.
Write out the over-all balanced equation for the ferrofluid synthesis.
8.
Why did we rinse the nanoparticles three times with water (what are you specifically removing)?
9.
What is the purpose of the surfactant? Chemically explain the process.
10. Other than those listed, what are three uses for ferrofluids.
Part III. Liquid Crystal Synthesis
11. As the color of the liquid crystal changes, what is happening to the pitch length?
12. If the color is green and changes to red, chemically/physically explain what has happened to the
liquid crystal and be specific.Hint: Look at the wavenmber values assigned to each color. Does
this correspond to a temperature increase or decrease? Why?
13. A student measures 0.66 g cholesteryl oleyl carbonate, 0.69 g cholesteryl pelargonate, 0.15 g
cholesteryl benzoate and combines them to make a liquid crystal. What is the most likely
transition temperature?