Presentation is loading. Please wait.

Presentation is loading. Please wait.

T. A. Kowalewski A. L. Yarin S. Błoński NANOFIBRES

Published byAlison Doyle Modified over 8 years ago

Similar presentations

Presentation on theme: "T. A. Kowalewski A. L. Yarin S. Błoński NANOFIBRES"— Presentation transcript:

1 T. A. Kowalewski A. L. Yarin S. Błoński NANOFIBRES
Institute of Fundamental Technological Research Polish Academy of Sciences & Department of Mechanical Engineering Technion - Israel Institute of Technology T. A. Kowalewski A. L. Yarin S. Błoński NANOFIBRES by electro-spinning of polymer solution

2 Nanofibres background
Nanofibres properties Increase of the surface to volume ratio -> solar and light sails and mirrors in space Reduction of characteristic dimension -> nano-biotechnology, tissue engineering, chemical catalysts, electronic devices Bio-active fibres: catalysis of tissue cells growth Mechanical properties improvement -> new materials and composite materials by alignment in arrays and ropes Nanofibres production: Air-blast atomisation Pulling from melts Electrospinning of polymer solutions NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

3 Classical liquid jet  0.1mm  Orifice – 0.1mm
Primary jet diameter ~ 0.2mm Micro-jet diameter ~ 0.005mm Gravitational, mechanical or electrostatic pulling limited to l/d ~ 1000 by capillary instability To reach nano-range: jet thinning ~10-3 draw ratio ~106 ! NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

4 Electro-spinning v=0.1m/s E ~ 105V/m
moving charges e bending force on charge e E ~ 105V/m viscoelastic and surface tension resistance Moving charges (ions) interacting with electrostatic field amplify bending instability, surface tension and viscoelasticity counteract these forces NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

5 Electro-spinning bending instability of electro-spun jet E ~ 105V/m
charges moving along spiralling path E ~ 105V/m Bending instability enormously increases path of the jet, allowing to solve problem: how to decrease jet diameter 1000 times or more without increasing distance to tenths of kilometres NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

6 Simple model for elongating viscoelastic thread
Electro-spinning Simple model for elongating viscoelastic thread Stress balance:  - viscosity, G – elastic modulus stress,  stress tensor, dl/dt – thread elongation Momentum balance: Vo – voltage, e – charge, a – thread radius, h- distance pipette-collector Kinematic condition for thread velocity v Non-dimensional length of the thread as a function of electrostatic potential NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

7 Nanofibres – basic setup
liquid jet ~ 105 Volt/m NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

8 Nanofibres – howto? Viscoelastic fluid:
Dilute solution (4 – 6)% of polyethylene oxide (molar weight g/mol), in 40% ethanol –water solvent Electrostatic field high voltage power supply (5-30kV) plastic syringe metal grid to collect fibres Visualization high speed camera (4000 – fps) high resolution „PIV” camera (1280x1024pixels) CW Argon laser, double pulse Nd:Yag laser, projection lens NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

9 Nanofibres – basic setup
NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

10 Nanofibres collection
NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

11 Nanofibres collection
NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

12 Electrospinning observed at 30fps
Average velocity of the fibres: 2 m/s 5 cm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

13 Electrospinning observed at 4500fps
0.0 ms 8.9 ms 17.8 ms 26.7 ms 35.6 ms 44.4 ms 53.3 ms 62.2 ms 71.1 ms 80.0 ms NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

14 Electrospinning observed at 4500fps
Average velocity of the fibre: 2 m/s 5 cm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

15 Electrospinning Collected nanofibres
 mm  -0.1 mm- NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

16 Electron microscopy PEO nanofibres
NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

17 Failure modes 0.5 mm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

18 Parametric study Model validation varying following parameters:
L – length of the rectilinear part  – angle of the envelope cone (image analysis) U – velocity of the fibre by PIV method a – fibre diameter (image analysis) structure of collected woven (failure modes) elongation strength of single fibre measured by air jet Effect of Electrostatic potential V Distance pipette-collector H Solution concentration c Distance from the pipette x L H NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

19 Parametric study PIV cross – correlation t = 500 s
image 2 t + t image 1 concentration of PEO: 3% Voltage: 8 kV H = 215 mm polymer solution with the addition of fluorescent particles (0.3m polymer microspheres) light source: Nd:Yag laser Average velocity of the fibres: 2 m/s NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

20 Tested polymers Test Polymer Solvent Concentration Voltage [kV]
Electrospinning I PEO Polyethylene-oxide 40% water – ethanol solution 3 – 4 % 3 – 12 good and stable process for voltage up to 10kV II DBC* Ethanol 2-29% 6 – 16 fairly good III TAC* 7-30 % 3 – 30 polymer too viscous 1-7 % 10 – 30 difficult IV PAN* DMF 1-25 % 5 – 25 very good *Prepared at Technical University of Łódź by dr Anna Błasińska NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

21 Parametric study Polymer: PEO  Concentration: c=3%
H Polymer: PEO Concentration: c=3% Solvent: 40% water- ethanol solution H=215mm V=8kV L (t) – instability of length of the rectilinear part NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

22 Parametric study Polymer: PEO  Concentration: c=4%
H Polymer: PEO Concentration: c=4% Solvent: 40% water- ethanol solution H=215mm L (V) – length of the rectilinear part  (V) – angle of the envelope cone NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

23 Parametric study Polymer: PEO  Concentration: c=4%
H Polymer: PEO Concentration: c=4% Solvent: 40% water- ethanol solution H=215mm U(V) – velocity of the fibre at the rectilinear part NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

24 Electrospinning observed at 25fps
Polymer: DBC Concentration: c=9% Solvent: ethanol H=215mm V=6kV 12 cm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

25 Different structure of spinning fibres for DBC polymer
U=6kV U=12kV DBC: c=9% H=215mm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

26 Parametric study Polymer: DBC  Concentration: c=9% Solvent: ethanol
H=215mm L (V) – length of the rectilinear part  (V) – angle of the envelope cone NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

27 Electrospinning observed at 25fps
Polymer: PAN Concentration: c=15% Solvent: DMF H=215mm V=13kV 12 cm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

28 Different structure of spinning fibres for PAN polymer
U=13kV U=19kV PAN: c=15% H=215mm NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

29 Parametric study Polymer: PAN  Concentration: c=15% Solvent: DMF
H Polymer: PAN Concentration: c=15% Solvent: DMF H=215mm L (V) – length of the rectilinear part  (V) – angle of the envelope cone NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

30 Comparison of PEO & DBC &PAN polymers
L (V) – length of the rectilinear part  (V) – angle of the envelope cone NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

31 Conclusions Electrostatic elongation of polymer threads allows
to produce relatively easily fibres in nano range diameters Collection of nano-woven of bio-active polymers, e.g.. chitin may have practical application for tissue growth Electrospinning of polymer solutions still lacks detailed mathematical model, necessary to perform process optimisation NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

32 Acknowledgements We would like to acknowledge the valuable contribution of dr Anna Błasińska from TU of Łódź and Anna Blim from IPPT PAN in the work presented. The work was partly supported by the Centre of Excellence AMAS of the IPPT PAN NANOFIBRES T. A. Kowalewski, A. L. Yarin & S. Błoński, EFMC 2003, Toulouse

Download ppt "T. A. Kowalewski A. L. Yarin S. Błoński NANOFIBRES"

Similar presentations

NEWTONIAN MECHANICS. Kinematic equations Frictional Force.

NEWTONIAN MECHANICS. Kinematic equations Frictional Force.
Electricity and Magnetism

Electricity and Magnetism
Fluid Properties and Units CEE 331 April 26, 2015 CEE 331 April 26, 2015 

Fluid Properties and Units CEE 331 April 26, 2015 CEE 331 April 26, 2015 
1 Physical principles of nanofiber production 1.Introduction D.Lukáš 2010.

1 Physical principles of nanofiber production 1.Introduction D.Lukáš 2010.
SHINSHU UNIVERSITY Shinshu University Nano Fusion Technology Research Group Study on the poly(1-butene) fibrous membrane via electrospinning Daisuke Kimura.

SHINSHU UNIVERSITY Shinshu University Nano Fusion Technology Research Group Study on the poly(1-butene) fibrous membrane via electrospinning Daisuke Kimura.
GENERATION OF PIN-HOLE DISCHARGES IN LIQUIDS František Krčma, Zdenka Kozáková, Michal Vašíček, Lucie Hlavatá, Lenka Hlochová Faculty of Chemistry, Brno.

GENERATION OF PIN-HOLE DISCHARGES IN LIQUIDS František Krčma, Zdenka Kozáková, Michal Vašíček, Lucie Hlavatá, Lenka Hlochová Faculty of Chemistry, Brno.
Drift velocity Adding polyatomic molecules (e.g. CH4 or CO2) to noble gases reduces electron instantaneous velocity; this cools electrons to a region where.

Drift velocity Adding polyatomic molecules (e.g. CH4 or CO2) to noble gases reduces electron instantaneous velocity; this cools electrons to a region where.
Introduction: Gravitational forces resulting from microgravity, take off and landing of spacecraft are experienced by individual cells in the living organism.

Introduction: Gravitational forces resulting from microgravity, take off and landing of spacecraft are experienced by individual cells in the living organism.
Chemistry 232 Transport Properties.

Chemistry 232 Transport Properties.
WOOL KERATIN-BASED NANOFIBRES FOR ACTIVE FILTRATION OF AIR AND WATER A. Aluigi, C.Vineis, A. Varesano, C. Tonetti, C. Tonin, G.Mazzuchetti. 2 nd International.

WOOL KERATIN-BASED NANOFIBRES FOR ACTIVE FILTRATION OF AIR AND WATER A. Aluigi, C.Vineis, A. Varesano, C. Tonetti, C. Tonin, G.Mazzuchetti. 2 nd International.
Electrospinning of hybrid polymers to mimic spider dragline silk Lim Yao Chong HCI ・ Low Rui Hao HCI ・ Tracey Atkinson AOS ・ Patrick Steiner AOS A joint-project.

Electrospinning of hybrid polymers to mimic spider dragline silk Lim Yao Chong HCI ・ Low Rui Hao HCI ・ Tracey Atkinson AOS ・ Patrick Steiner AOS A joint-project.
Introduction The rheology of two different semi-rigid “rod-like” polysaccharides in aqueous solutions, Xanthan gum (XG, Ketrol TF from Kelco) and Scleroglucan.

Introduction The rheology of two different semi-rigid “rod-like” polysaccharides in aqueous solutions, Xanthan gum (XG, Ketrol TF from Kelco) and Scleroglucan.
Instantaneous Fluid Film Imaging in Chemical Mechanical Planarization Daniel Apone, Caprice Gray, Chris Rogers, Vincent P. Manno, Chris Barns, Mansour.

Instantaneous Fluid Film Imaging in Chemical Mechanical Planarization Daniel Apone, Caprice Gray, Chris Rogers, Vincent P. Manno, Chris Barns, Mansour.
T. A. Kowalewski S. Błoński S. Barral Department of Mechanics and Physics of Fluids Experiments and Modelling of Electrospinning Process.

T. A. Kowalewski S. Błoński S. Barral Department of Mechanics and Physics of Fluids Experiments and Modelling of Electrospinning Process.
Monroe L. Weber-Shirk S chool of Civil and Environmental Engineering Fluid Properties and Units CEE 331 June 15, 2015 CEE 331 June 15, 2015 

Monroe L. Weber-Shirk S chool of Civil and Environmental Engineering Fluid Properties and Units CEE 331 June 15, 2015 CEE 331 June 15, 2015 
1 MFGT 242: Flow Analysis Chapter 3: Stress and Strain in Fluid Mechanics Professor Joe Greene CSU, CHICO.

1 MFGT 242: Flow Analysis Chapter 3: Stress and Strain in Fluid Mechanics Professor Joe Greene CSU, CHICO.
Fluid Properties and Units CVEN 311 . Continuum ä All materials, solid or fluid, are composed of molecules discretely spread and in continuous motion.

Fluid Properties and Units CVEN 311 . Continuum ä All materials, solid or fluid, are composed of molecules discretely spread and in continuous motion.
Monroe L. Weber-Shirk S chool of Civil and Environmental Engineering Fluid Properties and Units CEE 331 July 12, 2015 

Monroe L. Weber-Shirk S chool of Civil and Environmental Engineering Fluid Properties and Units CEE 331 July 12, 2015 
MECHANICAL PROPERTIES OF MATERIALS

MECHANICAL PROPERTIES OF MATERIALS
Heterogeneous Mixtures

Heterogeneous Mixtures

Similar presentations

Ads by Google