Transcript Weir spinner

Coaxial needle less electrospinning
Ing. Lucie Vysloužilová
Prof. RNDr. David Lukáš, CSc.
Coaxial electrospinning
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Special method for bicomponent core/shell nanofibers
production
Shell – mostly polymer material
Core – polymer of nonpolymer material, liquid, encapsulated
materials
Hollow nanofibers
Possibility of nonspinnable
shell
materials electrospinning
core
Coaxial needle electrospinning
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Droplet, one Taylor cone, one polymer jet
Low productivity
a) co-axial spinner
b) feeding of shell material
c) feeding of core material
d) drop
e) polymer jet
f) grounded collector
Coaxial needle less electrospinning
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Polymeric bi-layer
More Taylor cones
more polymer jets
Procutivity increasment
a) layer of „core“ material
b) layer of „shell“ material
c, d) Taylor cone
e) polymer jet
f) grounded collector
g) high electrical voltage source
Coaxial needle less electrospinning -basin
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Shell: 12% PVA
Core: oil
12%PVA/oil
12%PVA+dye/oil
Optical microscope
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Basin from nonconductive material
Shell: 12% PVA + dye
Core: oil
Optical microscope
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Basin from nonconductive material
Shell: 12% PVA + dye
Core: oil
50 µm
50 µm
Weir spinner
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A new device for bicomponent nanofibers production
Needle-less electrospinning
Principle: the bi-layer overflowing through electrode
Weir spinner
(a) Weir spinner
(b) Holder
(c) Feeding of shell material
(d) Feeding of core material
(e) Holder of cable from high voltage source
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Shell: 12% PVA + dye + rhodamin
core: 10% PVA + fitc dextran
Confocal scanning microscopy
100 µm
Core:10% PVA + rhodamin
100 µm
Shell: 12% PVA + fitc dextran
Advantages of needle-less coaxial
electrospinning technology
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Production of bicomponent core/shell nanofibers
Production of hollow fibers
Encapsulation – drug delivery systems
Electrospinning of nonspinnable materials by common
electrospinning technology
Increasing productivity
Easy cleaning of the spinner
Thank you for your attention!