Development and Applications of Carbon Nanotube Textiles · 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 0.01 0.10 1.00) Particle Size (µm) Control 1 layer 2 layer 3 layer

Development and Applications of

Carbon Nanotube Textiles Korea-US Forum on Nanotechnology

September 30th 2014

Dr. Philip Bradford, Assistant Professor

Department of Textile Engineering Chemistry and Science

NC State University

How are CNTs Usually Processed?

…liquid based processing creates bundled CNTs whose fabrics loose functionality

CNT Powder Gojny et al., Compos. Sci. Tech.

2005

Length/diameter

ratio: 100-1000

How Do We Produce Our MWCNTs?

C2H2 2C + H2

750oC

Iron Catalyst

Length-to-diameter ratio of

~ 100,000

This is same as…

…a human hair that is 30 feet long!

… a pencil that is half a mile long!

Drawable CNT Sheets

Carbon Nanotube Sheet Take-up

CNT Sheet Nonwoven Fabrics If mandrel or CNT sheet is traversed during take-up, larger pieces of fabric can be

created

Applications We are Exploring

7

Aerosol Filtration

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

1.E+02

0.01 0.10 1.00

Pa

rtic

le P

en

etr

atio

n (%

)

Particle Size (µm)

Control

1 layer

2 layer

3 layer

7 layer

Yildiz O. and Bradford P. Carbon, 2013, 64:295-304.

High Strength Hybrid Nanofiber Fabrics

0

50

100

150

200

0 10

Str

ess (

MP

a)

Strain (%)

60%CNT30%CNT

Applications We are Exploring

Battery Electrodes

Fu, K., et al. Advanced

Materials, 2013,

25(36):5109-5114.

High Performance Composites

Wang X, et al, Mater. Res. Lett.,(1) 2012

5μm 2μm

a b

Stano K. et al., ACS Appl. Mater.

& Interfaces, 2013

Applications We are Exploring

Strain Sensing

0

5

10

15

20

0

50

100

150

200

250

300

350

0 0.5 1 1.5 2

Ele

ctri

cal R

esi

stance

Change (%

)

Str

ess

(M

Pa)

Strain (%)

Stress vs. Strain

Resistance Data - CNTs Perpendicular to Loading

Resistance Data - CNTs Parallel to Loading

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0 50 100 150 200 250

Resi

stance

Change (

%)

Str

ain

(%)

Time(s)

Strain (%)

Resistance Change (%)

High Performance Foams

0

10

20

30

40

50

60

70

Latex

(0.1

39)

PU (0

.027

)

Sili

cone

(0.2

72)

PU (0

.038

)

Rid

gid P

U (0

.027

)

Rid

gid P

E (0.0

32)

Al (

0.20

0)

Al (

0.21

6)

Al (

0.27

0)

CNT (0

.049

)

Al (

0.21

6)

Al (

0.20

9)

CNT (0

.079

)

CNT (0

.114

)

Foam Type (Density g/cm3)

Sp

ecif

ic C

om

pre

ssiv

e S

tren

gth

(M

Pa/g

cm

-3)

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0 20 40 60 80 100

Co

mp

ressiv

e S

tress (M

Pa

)

Compressive Strain (%)

No anneal

30 min at 500oC in Air

Research Made Possible By:

My group members:

Kelly Stano

Ozkan Yildiz

James Stahl

Shagheyegh Faraji

Kun Fu

Spencer Barbour

Ang Li

Karim Aly

Jincheng Zhu

Funding agencies

AFOSR

ACS

NC Space Grant

Eastman Chemical

NASA

Thank you for

your attention!

Contact Information

[email protected]

919-515-1866

www.go.ncsu.edu/Bradford