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Physical principles of nanofiber production 1. Needle-less electrospinning. D. Lukáš 2010. 3.6. Self-organisation of electrospinning jets on free liquid surfaces. Needle electrospinning:

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Presentation Transcript
slide3

Needle electrospinning:

Self-organisation of the fluid in electrospinning is the underlying cause behind formation of the Taylor cone, the stable jet part, the whipping zone and evaporation of solvent.

Now, it will be shown that the self-organising potential of electrospinning is even more forcerful since it has a power to organize :

individual jets on free liquid surfaces without any need to use needless / capillaries to create them.

This finding is enormously attractive regarding the recent effort to elevate electrospinning technology to industrial level because it opens a chance to design simple as well as highly productive lines for nanofibrous layer production.

slide4

A rode instead of a needle

E = Ec

E = 0

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Stationary wave

d=1cm

1

2

3

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Epoxy resin

E

Ec

F. Sanetrník

no.

1 2 3 4 5 6

Sandra Torres

5

6

slide5

Dynamic phenomenon: field strength increment can lead to unlimited growth of a wave amplitude.

A. Sarkar

Wave vector

Amplitude

Angular frequency Growth factor

slide6

Stable amplitude

Growing amplitude

Dispersionlaw

Lukas D Sarkar A Pokorny P,Self organization of jets in electrospinning from free liquid surface - a generalized approach, accepted for publication, Journal of Applied Physics, 103 (2008), 309-316.

Electrospinning - X-rays

slide8

Euler equation

Velocity potential

Elektrostatic forces

gravitation

Surface tension

Equation of continuity

dispersion law

Prague 2007

slide9

Tonks-Frenkelinstability

E

Various field strengths

E

Stable waves of various wave numbers and angular frequencies.

Fastest forming instability

The only wave

Electrospinning - X-rays

slide10

Capillary waves

Electrospinning

Relaxation time

Growth factor

slide14

Minimal and negative square values of the angular frequency correspond to the maximal growth factors, q’s, inherently connected with the self-organisation caused by the mechanism of the fastest forming instability.

+

slide16

L

Electrospinning - X-rays

slide17

b

32 kV

43 kV

Linear clefts emit polymeric jets. Linear clefts in (a) and (b) emit polymeric (polyvinyl alcohol) jets at the voltages, 32 kV and 43 kV, respectively. The inter-jet distance / wavelength is l. The distance between the cleft and the collector was adjusted on 802 mm.

Electrospinning - X-rays

slide18

Technology

Jirsák, O. Sanetrník, F. Lukáš, D. Kotek, V. Marinová, L. Chaloupek, J. (2005) WO2005024101 A Method of Nanofibres Production from A Polymer Solution Using Electrostatic Spinning and A Device for Carrying out The Method.

www.elmarco.com

Electrospinning - X-rays