Transcript Preparation Of Single Pulp Fibres for Dynamic Mechanical

Preparation of Single Pulp Fibres for
Dynamic Mechanical
Analyses Using a Microrobotic Platform
Trabzon, 09.10.2013
Steffen Baasner
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Structure
1. Purpose of the STSM
2. Micro Robotic Platform and Preparation of Single Pulp Fibres at Technical University Tampere
3. Dynamic Mechanical Analyses at PTS Heidenau
4. First Results
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1. Purpose of The Short Term Scientific Mission (STSM)
Paper
Single Fibre
-
Preparation (STSM)
-
measurement
Fibre Bonds
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http://www.schrader-loos.de/t3/uploads/pics/europakarte_01.gif
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2.
Micro Robotic Platform and Preparation of Single
Fibres at Technical University Tampere
Top view camera
Side view camera
platform
Figure 1: microrobotic platform at TUT
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2.
Micro Robotic Platform and Preparation of Single
Fibres at Technical University Tampere
Steps
1. Disintegration of the fibres in an excess of water
2. Dropping the solution into a shuck of metal which is located on a rotary table (point 1, Figure 3)
3. Pulling the single fibre (point 3, Figure 3) out of solution with microgrippers (point 2, Figure 3)
XYZ – Micropositioners
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Microgrippers
Rotary table
1
3
Figure 3: Pulling the single fibre out of solutionwith
microgrippers
XY – table
Figure 2: function unities of the platform
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Saketi, Pooya et al. (2012), Journal of Microscopy, Vol. 248, page 167
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2.
Micro Robotic Platform and Preparation of Single
Fibres at Technical University Tampere
4. Depositing the single fibre on a plate (Figure 4).
5. Glueing it on the device (UV curing resin) on one end (Figure 5).
Figure 4: spring metal plate
Figure 5: on one end glued fibre
Overall 119 single fibres were prepared during the STSM.
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3.
Dynamic Mechanical Analysis at PTS Heidenau
• Applied load
- tension or shear (sinusoidal )
- force 0.001..18 N
- frequency 0.001..200 Hz
- amplitude 5 nm..1.6 mm
• Environmental parameters
- temperature (-150…500 °C)
- relative humidity (10…90 %)
at room temperature
Figure 6: Dynamic Mechanical Analyzer (DMA)
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3.
Dynamic Mechanical Analysis at PTS Heidenau
Offset during DMA measurement (tensile load)
Result of Measurement:
„Auto-Offset“
Specimen
E 
1. No offset
‚Buckling‘ / only half sinus wave/
no DMA measurement possbile
F
g
L
E  ²  E '²  E"²
    t
Calculation
2. Static stretching:
No ‚Buckling‘/
Sinus-wave / Measurement possible
Storage modulus
E '  E   cos 
Loss modulus
E"  E   sin 
Damping
static stretching = dynamic stretching · offset - factor
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tan 
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3.
Dynamic Mechanical Analysis at PTS Heidenau
Moisture chamber
air streaming module
RH sensor
Figure 7: moisture chamber with sample holder inside
Force and displacement sensor inside
Sample holder
Single fibre
Tension membran
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Figure 8: sample holder with single fibre inside
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4.
First Results
- result of meassuring five fibres
- frequency sweep (2 x 1-200-1 Hz)
- Constant force 0,1N
20 % RH
80 % RH
E´ [Mpa]
F [Hz]
E´ [Mpa]
F [Hz]
E´ [Mpa]
F [Hz]
min
9578.07
1.78
7145.07
1.78
5424.53
2.24
max
14117.3
44.7
12082.6
70.79
10976.2
70.79
difference 4539.23
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50 % RH
4937.53
5551.67
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Acknowledgement
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Prof. Pasi Kallio and the Micro- and Nanosystems Research Group of the TU Tampere
o Koroush Latifi
o Pooya Saketi
o Mathias von Essen
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Advisers at PTS Heidenau
o Dr. Stephan Daus
o Jens Kretzschmar
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COST FP 1105 action of the European Union
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PTS Pulp Symposium
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Thank you for your attention!
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