Dale W. Schaefer, Jian Zhao Department of Materials Science and Engineering University of Cincinnati Cincinnati, OH 45221-0012 is Brown, Dave Anderson, Max Alexander, Liz Donalds Lindsay Richardson and Jeff Baur Air Force Research Laboratory Dayton, Ohio Jan Ilavsky National Institutes of Standards and Technology UNICAT Advanced Photon Source Argonne National Laboratory, 9700 South Cass Avenue Argonne, IL 60439 Hierarchical Structure of Carbon Nanotubes and Nanofibers
13
Embed
Dale W. Schaefer, Jian Zhao Department of Materials Science and Engineering University of Cincinnati Cincinnati, OH 45221-0012 Janis Brown, Dave Anderson,
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Dale W. Schaefer, Jian ZhaoDepartment of Materials Science and Engineering
University of CincinnatiCincinnati, OH 45221-0012
Janis Brown, Dave Anderson, Max Alexander, Liz Donaldson, Lindsay Richardson and Jeff Baur
Air Force Research LaboratoryDayton, Ohio
Jan Ilavsky National Institutes of Standards and Technology
UNICATAdvanced Photon Source
Argonne National Laboratory, 9700 South Cass AvenueArgonne, IL 60439
Hierarchical Structure of Carbon Nanotubes and Nanofibers
Multi-walled Nanofibers Single-walled Nanotubes
300 nm
1.2 µ
TEM comparing MWNFs (left) and SWNTs (right). Note the branched polymer character of the SWNTs. The SWNTs are clustered into “ropes” that are not disrupted upon water suspension. Images are from Air Force Research Laboratory (AFRL).
G 3.8573 0Rg 18.114 0B 0.0040198 0.021294Pow 2.1332 1.9831
Hard Particle Diameter = 2.4 x RG = 4.3 nm= 43 ÅToo small?
As Received (dirty)
ASI Nanofibers
0.1
1
10
Inte
nsit
y
3 4 5 6 7 8
10-52 3 4 5 6 7 8
10-42 3 4 5 6
q(Å-1)
-1
rASI_21_PSSO3 rASI_21_PMMA rASI_21_PAAHCL
10-3
10-2
10-1
100
101
102
103
104
105
106
107
108
x-r
ay
Cro
ss S
ecti
on
(cm
-1)
10-5 10-4 10-3 10-2 10-1
q(Å-1)
-1.06
-2.80
-3.27
210 Å
4570 Å
Jian PULS Soln USAX Soln
1.2 µ
Light
Light +USAXS+SAXS
Surface roughness?
Large-Scale Structure of Suspended SWNTs and MWNFs
0.1
1
10
Inte
nsi
ty3 4 5 6 7 89
10-5
2 3 4 5 6 7 89
10-4
2 3 4 5 6
q(Å-1)
ASI Nanofibers
-1.0
PSSO3 PMAA PAAHCL
0.01
0.1
1
10
100
1000
Inte
nsi
ty
10-6
2 3 4 5 6 7
10-5
2 3 4 5 6 7
10-4
2 3 4 5 6
q(Å-1)
Clean SWNT
PMAA PSS03 PAAHCL
-1.87
-2.54
-2.22
Comparison of Small-angle Light scattering from nanotubes and nanofibers.Dispersing agents of PMAA, PSSO3 and PAAHCl were used to assist dispersion in water.
SWNT Fractal Structure MWNF Rod-like Structure
SWNT Aggregates are Very Robust
0.1
1
10
100
1000
Inte
nsi
ty
2 4 6 8
10-5
2 4 6 8
10-4
2 4 6
q(Å-1)
Cl SWNT
PSSO3 5 m PSS03 30 s PSSO3 0 s
0.1
1
10
100
1000
Inte
nsi
ty
10-6
2 4 6 8
10-5
2 4 6 8
10-4
2 4 6
q(Å-1)
Cl SWNT
PMAA_5 m PMAA_30 s PMAA_0 s
Reciprocal space data on SWNTs dispersed in water with polystyrene sulfonate and polymethylacrylic acid.. The data is from a Micromeritics Digisizer.
Sonication has little effect on Large Scale Structure of SWNTs
Mechanical Properties of Coated Nanofiber/PU Composites
Comparison of DMA data from uncoated, one layer and two layers coated 15wt% nanotubes PU films. The loss as Tan delta (lower three curves) is plotted on the right axis. The legend in the figure indicates the strain sweep sequence. These samples were all swept three times.