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Part iii. synthesis of cholesteryl ester liquid crystals

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

Pre-lab: nanotechnology

(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 FeCl 3 size 12{ ital "FeCl" rSub { size 8{3} } } {} in 2.0 M HCl from FeCl 3 6H 2 O size 12{ ital "FeCl" rSub { size 8{3} } cdot 6H rSub { size 8{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 HAuCl 4 size 12{ ital "HAuCl" rSub { size 8{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 . 3g / cm 3 size 12{9 "." 3g/ ital "cm" rSup { size 8{3} } } {} ?
  • What is the total surface area of 3 g of 5 micrometer gold particles assuming gold has a density of 9 . 3g / cm 3 size 12{9 "." 3g/ ital "cm" rSup { size 8{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?

Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
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?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
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?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
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
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Source:  OpenStax, Honors chemistry spring. OpenStax CNX. Mar 10, 2008 Download for free at http://cnx.org/content/col10512/1.9
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