Nanofiber-base Refrigeration Alexandria Trevino and Bret Flanders - - PowerPoint PPT Presentation

Nanofiber-base Refrigeration

Alexandria Trevino and Bret Flanders Department of Physics Kansas State University

TC TH

Seebeck Effect

∆V

Thermoelectric Refrigeration

Directional Growth of polypyrrole and polythiophene wires

Prem S. Thapa, Deok Jin Yu, James P. Wicksted, Jeffrey A. Hadwiger, Joseph N. Barisci, Ray H. Baughman, and Bret N. Flanders

Directional electrochemical nanowire assembly Thapa, P. S., Yu, D. J., Wicksted, J. P., Hadwiger, J. A., Barisci, J. N., Baughman, R. H., & Flanders, B.

• N. (2009). Directional growth of polypyrrole and polythiophene wires. Applied Physics Letters,94(3),
• 033104. doi:10.1063/1.3072611
• Voltage-amplitude and frequency induces growth
• Knobby structure
• 𝐹𝑚𝑓𝑑𝑢𝑠𝑗𝑑𝑏𝑚 𝑑𝑝𝑜𝑒𝑣𝑑𝑢𝑗𝑤𝑗𝑢𝑧 =

𝑚 𝑆𝐵

PEDOT:Heparin Growth

40 μm 20 μm

AU, WE AU, CE Monomer Solution AU, WE AU, CE Voltage

Atomic Force Microscopy (AFM)

5 μm 1 µm

595 nm wire 963 nm wire

Diameter (nm) 400 600 800 1000 1200 Count 10 20 30 40 50

L=74.66 𝜈m L=52.70 𝜈m L=47.23 𝜈m

∆𝑊 − The voltage drop across R when I flows though it

100 𝜈M Heparin content

Length (𝛎m) Diameter (nm) Resistance (M𝞩) Conductivity (S cm^-1)

Wire 1 64.03 993 1.07 0.770 Wire 2 64.30 830 0.988 1.20 Wire 3 62.96 964 0.813 1.06 Wire 4 44.55 973 0.858 0.698 Wire 5 57.15 960 1.13 0.700 Wire 6 49.81 622 1.26 1.30

L=44.09 𝜈m L=62.78 𝜈m L=42.68 𝜈m L=43.64 𝜈m Length (𝛎m) Diameter (nm) Resistance (M𝞩) Conductivity (S cm^-1)

Wire 1 42.68 1362 0.322 0.910

10 𝜈m Heparin content

Conclusion

Heparin PEDOT

• The electrical conductivity does not depend on diameter, resistance,

and length.

• We should see a consistency with the electrical conductivity
• f wires grown at the same conditions.

Future Work

• Continue pursing decreasing the heparin content
• Test the electrical conductivity of PEDOT:

Heparin at different temperatures

• Test the thermal conductivity
• PEDOT: Tosylate

Acknowledgements

• Bret Flanders
• Krishna
• Gobind
• NSF
• K-State
• REU students

Questions?

5 μm 1 µm

Length (𝛎m) Diameter (nm) Resistance (M𝞩) Conductivity (S cm^-1)

Wire 1 42.68 1362 0.322 0.910

L=74.66 𝜈m L=52.70 𝜈m L=47.23 𝜈m

L=44.09 𝜈m L=62.78 𝜈m L=42.68 𝜈m L=43.64 𝜈m

Diameter (nm) 400 600 800 1000 1200 Count 10 20 30 40 50

20 μm

Length (𝛎m) Diameter (nm) Resistance (M𝞩) Conductivity (S cm^-1)

Wire 1 64.03 993 1.07 0.770 Wire 2 64.30 830 0.988 1.20 Wire 3 62.96 964 0.813 1.06 Wire 4 44.55 973 0.858 0.698 Wire 5 57.15 960 1.13 0.700 Wire 6 49.81 622 1.26 1.30