# Nanotechnology: ferrofluids to liquid crystals  (Page 4/4)

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## Chemicals

• Cholesteryl oleyl carbonate
• Cholesteryl pelargonate
• Cholesteryl benzoate
• Vials
• Heat gun

## Liquid crystal synthesis

• Place 0.65 g cholesteryl oleyl carbonate, 0.25 g cholesteryl pelargonate, and 0.10 g cholesteryl benzoate in a vial.
• In a hood, with the cap off, melt the solid in with a heat gun.
• While the mixture is still a liquid, divide it into separate vials using a disposable pipette. Put the caps back on the vials. Allow the vials to cool and observe their properties.
• Clean up your bench area.
• Listed below is a chart of the different ratios that produce liquid crystals with different transition temperatures. Placing liquid crystals with different transition temperatures next to each other on a clear piece of contact paper makes it possible to make a thermometer.

 Cholesteryl oleyl carbonate (g) Cholesteryl pelargonate (g) Cholesteryl benzoate (g) Transition range, degrees C 0.65 0.25 0.10 17-23 0.70 0.10 0.20 20-25 0.45 0.45 0.10 26.5-30.5 0.43 0.47 0.10 29-32 0.44 0.46 0.10 30-33 0.42 0.48 0.10 31-34 0.40 0.50 0.10 32-35 0.38 0.52 0.10 33-36 0.36 0.54 0.10 34-37 0.34 0.56 0.10 35-38 0.32 0.58 0.10 36-39 0.30 0.60 0.10 37-40

## (total 10 points)

Hopefully here for the Pre-Lab

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

• In a 3 nm gold particle, what percentage of the atoms are on the surface? Hint: You need to find the radius of a single gold atom and the equation for the volume of a sphere is also helpful. Remember that the volume of a shell is Vshell=4/3πr3 (r3-(r-2r)3).
I am giving them this because all the students had trouble with this. The other things are easier to find but this isn’t.

## Part ii. synthesis of an aqueous ferrofluid

• How would you make a 100 mL solution of 1.0 M ${\text{FeCl}}_{3}$ in 2.0 M HCl from ${\text{FeCl}}_{3}\cdot {6H}_{2}O$ and concentrated HCl solution? Show all calculations. Hint: First find volume of water needed to make concentrated HCl ~12.1 M

## Part iii. liquid crystal synthesis

• In your own words, explain what a liquid crystal is.

## 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

• What was the starting color of the ${\text{HAuCl}}_{4}$ solution?
• What was the beginning oxidation state of Au?
• What was the ending oxidation state of Au?
• What is the purpose of the sodium citrate solution?
• What is the total surface area of 3 g of 5 nm gold particles assuming gold has a density of $9\text{.}3g/{\text{cm}}^{3}$ ?
• What is the total surface area of 3 g of 5 micrometer gold particles assuming gold has a density of $9\text{.}3g/{\text{cm}}^{3}$ ?

## Part ii. synthesis of an aqueous ferrofluid

• Write out the over-all balanced equation for the ferrofluid synthesis.
• Why did we rinse the nanoparticles three times with water (what are you specifically removing)?
• What is the purpose of the surfactant? Chemically explain the process.
• Other than those listed, what are three uses for ferrofluids.

## Part iii. liquid crystal synthesis

• As the color of the liquid crystal changes, what is happening to the pitch length?
• 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?
• 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?

Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
how did you get the value of 2000N.What calculations are needed to arrive at it
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