Electrospinning solution properties

In addition to the process parameters, a number of system parameters play an important role in fiber formation and the obtained structure. System parameters include molecular weight, molecular weight distribution, polymer architecture, and solution properties. Solution properties play a particularly important role. In relation to their impact on the electrospinning process, these factors can be ranked as follows polymer concentration, solvent volatility, and solution conductivity. 

The following parameters and processing variables affect the electrospinning process (i) system parameters such as molecular weight, molecular weight distribution and architecture (branched, linear, etc.) of the polymer, and polymer solution properties (viscosity, conductivity, dielectric constant, and surface tension, charge carried by the spinning jet) and (ii) process parameters such as electric potential, flow rate and concentration, distance between the capillary and collection screen, ambient parameters... 

The morphology and the diameter of the electrospun nano Hers can be affected by many electrospinning parameters including solution properties (the concentration, liqnid viscosity, surface tension, and dielectric properties of the polymer solution), processing conditions (apphed voltage, volume Cbw rate, tip to collector distance, and the strength of the apphed electric Hid), and ambient conditions (temperature, atmospheric pressure and humidity) [17-20]. 

Son, W.K., Youk, J.H., Lee, T.S. and Park, W.H. 2004b. The effects of solution properties and polyelectrolyte on electrospinning of ultrafine poly (ethylene oxide) fibers. 45 ... 

Finally, depending on the needle used, that is simple or concentric, we refer to conventional or coaxial electrospinning, respectively. In general, two groups of parameters have to be taken into account in order to optimize the electrospinning process (i) those related to the solution properties, such... 

The vapor phase chemical deposition of PPy on the surface of the electrospun PVA nanofibers was successfully performed. Morphology of the nanofibers and successful deposition of the PPy onto the nanofibers is governed by the oxidant type and its concentration in the electrospinning solution. At the best studied condition, a layer of PPy with the thickness of 1,000 nm is formed onto the PVA nanofibers surface using ammonium persulfate as oxidant. In contrast, surface coating was not observed in the case of FeClj as oxidant. The electrical conductivity of the coated nanofiber mats depends on the coating conditions and reaches to 10 S/cm. Large surface area of the sensor material with the electrochemical activity is one of the most important properties for sensor application. Since, it is obvious that the surface area of PPy coated non-... 

Many material parameters and process parameters have important effects on both the electrospinning process and the resulting fiber morphology. The fiber diameter depends on the solution properties (e.g., viscosity, conductivity, surface tension, permittivity, and boiling point) and/or operating conditions (e g., applied voltage, spinneret-to-collector distance, and flow rate) summarized in Table 6.1. 

Chen H, Snyder JD, Elabd YA (2008) Electrospinning and solution properties of Nafion and poly(acrylic acid). Macromolecules 41(1) 128-135... 

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