ENG762s2 Advanced Materials - Montmorillonite Clay - Nanofibrous Materials - Science Assignment help

ENG762s2: Advanced Materials Science Assignment help

Assignment Task:

Question 1
Montmorillonite clay consists of sheets of aluminosilicate approximately 1 nm thick. Describe:

a) Why the aluminosilicate sheets stick together.

b) What are gallery spaces in the clay.

c) How polymer can be used to swell the clay and cause exfoliation. Use diagrams in your answer.

d) What ions you would use to promote exfoliation and why?

e) Why the sheets of aluminosilicate would be close to their theoretical strength.

f) How a circular hole within an individual sheet of aluminosilicate would lower its tensile strength from a theoretical value of 30GPa to an experimental value of 10GPa.

Question 2
Nanofibrous materials can be produced in a number of ways depending if the materials is metallic or polymeric.

a) Metal nanowires are typically produced using vapour-liquid-solid (VLS) methods. Describe the experimental setup for growing Germanium nanowires from VLS using a
diagram.

b) By considering a single nanowire, discuss in detail the growth mechanism for the Germanium nanowire.

c) Describe why VLS is unsuitable for producing polymer nanowires.

d) Electrospinning is a common method for producing polymer nanofibres. Describe the electrospinning mechanism.

e) Electrospun fibres are found to still contain significant solvent when collected on the ground electrode. Suggest how the solvent could be removed completely during the
electrospinning process and before collection at the ground electrode.

Determine:
a) The principal stresses using the Mohr’s circle

b) The Tresca stress for the artificial spinal disk

c) If the device is safe from yielding, being the yield strength for the implant material of 8MPa

Question 4
Many biological materials are composed of mixtures; for example, bone may be considered a mixture of collagen and mineral. Consider the elastic modulus of a mixture of two materials whose individual moduli are E1 and E2. The volume fractions of materials 1 and 2 are V1 and V2, respectively. It is known that the elastic modulus of the mixture has upper and lower limits given by mathematical models known as Voigt and Reuss models, respectively.

a) What are the principal assumptions of such models?

Derive the following results for the modulus of the mixture:
b) Voigt model, upper bound

E =V1E1 +V2E2

c) Reuss model, lower bound
E = E1E2
   V1E2 +V2E1

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