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Fyzikální principy tvorby nanovláken 11. Kapalinová tryska
D.Lukáš 2010
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Donghua University, Shanghai, China
Reference: Xiao-Hong Quin & col Donghua University, Shanghai, China Effect of LiCl on electrospinning of PAN polymer solution: theoretical analysis and experimental verification Polymer,
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z Liquid density Volume flow rate Rovnice kontinuity, zákon zachování hmoty Applied electric field Surface Bulk + + + Rovnice kontinuity pro náboj El. current r u Surface density of the charge + + + Dimensionless conductivity + +
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Bernoulli equation Zákon zachování energie Electrostatic surface force Viscous force
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Scaling and dimensionless analysis
mass current Allometric relation energy
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m=? Nonlinear differential equation
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z + + + r u + + + + +
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Whipping part of the jet
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a b Figure 4.4. Loops in unstable region of jet, caught on a slide glass -(a) PVA jet, (b) PEO jet.
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Figure Schematic diagram showing the Pendulum mechanism: (1) ground collector, (2) pendulum and (3) spinning electrode with a polymer.
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a b Figure 4.5. Instability of Polyethylene-oxide jet - Exposed with two various exposure times of 1 ms and 18 ns.
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