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 Paper

Single FibreSingle Fibre Fibre BondsFibre Bonds

- Preparation (STSM)

- measurement

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

Figure 1: microrobotic platform at TUT

platformplatformSide view cameraSide view camera

Top view cameraTop view camera

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2. Micro Robotic Platform and Preparation of Single Fibres at Technical University TampereSteps

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)

Figure 3: Pulling the single fibre out of solutionwith microgrippers

1

2

3

Rotary tableRotary table

XY – tableXY – table

MicrogrippersMicrogrippers

XYZ – MicropositionersXYZ – Micropositioners

Figure 2: function unities of the platform

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).

Overall 119 single fibres were prepared during the STSM.

Figure 4: spring metal plate Figure 5: on one end glued fibre

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3. Dynamic Mechanical Analysis at PTS Heidenau

Figure 6: Dynamic Mechanical Analyzer (DMA)

• 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

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Offset during DMA measurement (tensile load)

Specimen 1. No offset ‚Buckling‘ / only half sinus wave/no DMA measurement possbile

„Auto-Offset“

static stretching = dynamic stretching · offset - factor

gL

FE

t

cos' EEStorage modulus

sin" EELoss modulus

tanDamping

Result of Measurement:

Calculation

3. Dynamic Mechanical Analysis at PTS Heidenau

2. Static stretching:No ‚Buckling‘/

Sinus-wave / Measurement possible

"²'²² EEE

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3. Dynamic Mechanical Analysis at PTS Heidenau

Moisture chamber Moisture chamber

RH sensorRH sensorair streaming moduleair streaming module

Sample holderSample holderSingle fibreSingle fibre

Tension membranTension membran

Force and displacement sensor insideForce and displacement sensor inside

Figure 7: moisture chamber with sample holder inside

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

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20 % RH 50 % 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 4937.53 5551.67

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Acknowledgement

- Prof. Pasi Kallio and the Micro- and Nanosystems Research Group of the TU Tampere

o Koroush Latifi

o Pooya Saketi

o Mathias von Essen

- Advisers at PTS Heidenau

o Dr. Stephan Daus

o Jens Kretzschmar

- 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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