Final Presentation
description
Transcript of Final Presentation
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1Final Presentation
Stephanie Moran, Ryan Rosario, Zachary Stauber, Bethany Tomerlin, Juan Carlos Ybarra
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2Goals Achieved
1. Inexpensive
2. High Elongation (>10%)
3. Precision (Error <6%)
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3There is a minimum concentration of carbon black required for conductivity.
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4Conduction in the composite cannot be explained by tunneling, but can be modeled by Mean Field Theory.
e-e-
4nm
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5As the sample elongates, the distance between nearby carbon black particles changes.
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6Particle movement affected by the viscoelastic properties of the polymer.
Viscoelastic Model
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7Carbon black fillers significantly affect the microstructure of the polymer
Sticky Hard Layer
Glassy Hard Layer
Carbon Black
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8Steps to our Final Fabrication Process
15-25 % Carbon Black
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9Steps to our Final Fabrication Process
15-25 % Carbon Black
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10Steps to our Final Fabrication Process
15-25 % Carbon Black
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11Steps to our Final Fabrication Process
Calender
15-25 % Carbon Black
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12Steps to our Final Fabrication Process
Calender
20% Vol. KetJen Carbon Black15-25 % Carbon Black
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13Steps to our Final Fabrication Process
Calendar
20% Vol. KetJen Carbon Black15-25 % Carbon Black
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14Steps to our Final Fabrication Process
Calender
20% Vol. KetJen Carbon Black15-25 % Carbon Black
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15Steps to our Final Fabrication Process
Calender
-1hr Monomer-20 Minutes with Monomer and Cross Linking Agent
20% Vol. KetJen Carbon Black15-25 % Carbon Black
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16High Shear Seen With Dispersion Blade
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17Large Agglomerates Still Seen in Samples with Dispersion Blade
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18Characterization of voids using confocal microscopy
Mixed, calendered, and vacuumed Only mixed
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19Four-point resistance measurements eliminate errors due to changing contact resistance.
VoltageCurrent
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20An automatic data acquisition setup allows for a faster sample rate.
Multimeter
Multimeter
Elongation Voltage Output
Resistance Output
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21Cycling of 20% KetJen Sample
0 50 100 150 200 250 300 350 400 4500.00E+00
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5.00E+05
-0.05
0
0.05
0.1
0.15
0.2
0.25
Resistance and Extension vs Time
ResistanceExtension
Time (seconds)
Resis
tanc
e (O
hm)
Exte
nsio
n (in
./in
.)
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22Hysteresis of 20% KetJen Sample
0 0.05 0.1 0.15 0.2 0.250.00E+00
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
Resistance vs Extension
Cycle 4Cycle 5Cycle 6Cycle 7Cycle 8Cycle 9Cycle 10Cycle 11Cycle 12
Extension (in./in.)
Resis
tanc
e (O
hm)
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23Equation used to program Arduino
1.50E+05 2.00E+05 2.50E+05 3.00E+05 3.50E+05 4.00E+050.00
0.05
0.10
0.15
0.20
0.25
f(x) = 9.39371295481504E-07 x − 0.159460016463656R² = 0.985043935797212
Resistance vs Extension
Cycle 12Linear (Cycle 12)
Resistance (Ohm)
Exte
nsio
n (in
./in
.)
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Minimum Goals for Strain Sensor Prototype
Minimum Requirements:MC
Text Output: Strain vs. Resistance
Sensor
1. Characterize sample
2. Create Equation For Samples
3. Calibrate sensor for final design.
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Circuit for Strain Measurement Prototype
Microcontroller
MultiplexerAmplifier
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Glove for Final Design
Final Design:
MC
Arduino
Output:Dynamic Graphical Representation of Strain vs. Resistance
Multiplexer Amp
Bread Board
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Structure of Carbon Black Filled Rubber Composites
MultiplexerAmplifier
Yoshihide Fukahori. Current Topics In Elastomer Research (2008).
Sticky Hard (SH)
Glassy Hard (GH)
Carbon Black
Matrix Cross-LinkedRubber
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Super-Network Under Strain
MultiplexerAmplifier
Yoshihide Fukahori
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Carbon Black Affects Curing Time
MultiplexerAmplifier
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Microstructure and Time Dependence of Conductivity
MultiplexerAmplifier
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
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31Our System can Complement Traditional MoCap Systems
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32Our System can Provide Joint Motion Feed Back LoopsOccupational Therapy
Sports Therapy
Ergonomic Training and Monitoring
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33Cost 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
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34Cost Propagation using an Analogous Industry
http://www.ic.gc.ca/cis-sic/cis-sic.nsf/IDE/cis-sic32621cote.html
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35We would Like to Thank…
-Mike and Matt-David Bono-Forest Lau -3.042 Staff
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36Any Questions?
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37Complete Circuit Design
MC
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Normalization of Data
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39Bubble Removal with Vacuum
Before Vacuuming
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40Bubble Removal with Vacuum
Before Vacuuming During Vacuuming
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41Bubble Removal with Vacuum
Before Vacuuming During Vacuuming After Vacuuming
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42Comparisons of Processing Techniques
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43Comparisons of Processing Techniques
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ExtraVolume percent and particle size calculations
Using Ketjen Carbon Black
Surface area: 1400 m^2/gr ≈ 2nm assuming randomly oriented
hemi-spherical particles
Density of graphite ≈ 2.15 g/cm^34.5 g CB / 0.85 cups polymer ≈ 1.04 vol.-%
≈ 5 area-%
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45Failure vs. Hole Radius Size
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46Increase in Bubble Size Under Vacuum
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Porosity Characterization of Carbon Filled Elastomers
MCVoids Seen Under Confocal Microscope
10X 200X
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MC
Dispersion Kneader