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Final Presentation. Stephanie Moran, Ryan Rosario, Zachary Stauber , Bethany Tomerlin , Juan Carlos Ybarra . Goals Achieved . Inexpensive High Elongation (>10%) Precision (Error <6%). There is a minimum concentration of carbon black required for conductivity.

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slide1

Final Presentation

Stephanie Moran, Ryan Rosario, Zachary Stauber, Bethany Tomerlin, Juan Carlos Ybarra

slide2

Goals Achieved

Inexpensive

High Elongation (>10%)

Precision (Error <6%)

slide4

Conduction in the composite cannot be explained by tunneling, but can be modeled by Mean Field Theory.

e-

e-

4nm

slide7

Carbon black fillers significantly affect the microstructure of the polymer

Sticky Hard Layer

Glassy Hard Layer

Carbon Black

slide11

Steps to our Final Fabrication Process

15-25 % Carbon Black

Calender

slide12

Steps to our Final Fabrication Process

15-25 % Carbon Black

20% Vol. KetJen Carbon Black

Calender

slide13

Steps to our Final Fabrication Process

15-25 % Carbon Black

20% Vol. KetJen Carbon Black

Calendar

slide14

Steps to our Final Fabrication Process

15-25 % Carbon Black

20% Vol. KetJen Carbon Black

Calender

slide15

Steps to our Final Fabrication Process

15-25 % Carbon Black

20% Vol. KetJen Carbon Black

-1hr Monomer

-20 Minutes with Monomer andCross Linking Agent

Calender

slide18

Characterization ofvoids using confocal microscopy

Mixed, calendered, and vacuumed

Only mixed

slide19

Four-point resistance measurements eliminate errors due to changing contact resistance.

Current

Voltage

slide20

An automatic data acquisition setup allows for a faster sample rate.

Elongation Voltage Output

Multimeter

Multimeter

Resistance Output

slide24

Minimum Goals for Strain Sensor Prototype

Minimum Requirements:

MC

Sensor

Text Output: Strain vs. Resistance

Characterize sample

Create Equation For Samples

3. Calibrate sensor for final design.

slide25

Circuit for Strain Measurement Prototype

Microcontroller

Amplifier

Multiplexer

slide26

Glove for Final Design

Final Design:

Output:

Dynamic Graphical Representation of Strain vs. Resistance

Bread Board

Arduino

Multiplexer

Amp

MC

slide27

Structure of Carbon Black Filled Rubber Composites

Matrix Cross-Linked

Rubber

Sticky Hard (SH)

Glassy Hard (GH)

Amplifier

Multiplexer

Carbon Black

YoshihideFukahori. Current Topics In Elastomer Research (2008).

slide28

Super-Network Under Strain

Amplifier

Multiplexer

YoshihideFukahori

slide30

Microstructure and Time Dependence of Conductivity

  • Observed a decrease in conductivity over time for some samples.
  • Crosslinking proceeds over time.
  • Tests for future work:
    • Rheometry
    • Mechanical Testing
    • Time-dependent environmental effects
    • NMR
    • FTIR

Amplifier

Multiplexer

slide32

Our System can Provide Joint Motion Feed Back Loops

Occupational Therapy

Sports Therapy

Ergonomic Training and Monitoring

slide33

Cost Analysis of the Sensor

Ketjen Carbon Black $25.07 Per Pound

Polyurethane Rubber $5. 38 pound (retail)

Assume a standard markup of 100 % = $2.69 pound

.016 pounds carbon black + .43 pounds rubber=

25 Sense-on Sensors

Materials Cost of sensors is 6 to 12 cents

Off the Shelf Electronics ( resistors, leads) << $1

slide34

Cost Propagation using an Analogous Industry

http://www.ic.gc.ca/cis-sic/cis-sic.nsf/IDE/cis-sic32621cote.html

slide35

We would Like to Thank…

35

-Mike and Matt

-David Bono

-Forest Lau

-3.042 Staff

slide40

Bubble Removal with Vacuum

Before Vacuuming

During Vacuuming

slide41

Bubble Removal with Vacuum

Before Vacuuming

During Vacuuming

After Vacuuming

slide44

Volume percent and particle size calculations

Using Ketjen Carbon Black

Surface area: 1400 m^2/g

r ≈ 2nm assuming randomly oriented hemi-spherical particles

Density of graphite ≈ 2.15 g/cm^3

4.5 g CB / 0.85 cups polymer ≈ 1.04 vol.-%

≈ 5 area-%

slide47

Porosity Characterization of Carbon Filled Elastomers

10X

200X

MC

Voids Seen Under Confocal Microscope