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Polymers!!!Nanotubes!!!
Matt Montgomery
Kris Behler, Mentor
Dr. Yuri Gogotsi, Advisor
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Objective
• Electrically conductive micro-fibers
Method
• Electrospin polymer + nanotube
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Electrospinning
http://www.che.vt.edu/Wilkes/electrospinning/Slide1.JPG
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Concentrations
• Polymer (≤ 30%)
• Solvent (≥ 70%)
• Multi-walled Carbon Nanotubes (≈ 0.1% to 0.02%)
0%
20%
40%
60%
80%
100%
1
Concentrations of Species in Solution
MWCNTs
Polymer
Solvent
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Polymer:• (PVDF= Polyvinylidene-fluoride)
Solvent:• (DMA = Dimethyl-aniline)
• (DMF = Dimethyl-formamide)
Our solutions
PVDF pellets
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• Multiwalled Carbon Nanotubes
TEM image
Catalysts
Average diameter between 10 and 20 nanometers
Computer model of MWCNTwww.thomas-swan.co.uk/ pages/nano_images.html
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Problems
• Solubility of PVDF
• Viscosity / Solidification
• Nanotube dispersal
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Our electrospinningapparatus
Heat lamps to keep solution from solidifying
Fiber Collection plate (copper plate with aluminum foil
wrapped over it)
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Fibers
• Do they contain carbon nanotubes?• Are they more conductive?
Our electrospun fibers
More of our fibers
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Raman Spectroscopy
Standard carbon nanotube signature
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Raman Spectra shows characteristic peaks– 1330 cm-1 D-band
– 1430 cm-1 PVDF peak– 1584 cm-1 G-Band
λ = 633 nm, 500x mag, 500sec Slide courtesy of Kris Behler
Carbon nanotubes successfully embedded in PVDF!
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Research continues.