Polyacrylonitrile nanofibrous tubular structures were produced through typical and opposite charge electrospinning methods and the effect of the method as well as the two key electrospinning parameters, namely concentration of the electrospinning polymer solution and rotational speed of mandrel collector on properties of such tubular structures were studied. The smples were characterized by...

This study describes the opposite charge electrospun method for preparation of polyacrilonitrile / DMF nanofibrous tubular structure . Constant a processing parameters such as high polymer concentration and rotational speed mandrel collector with varied applied voltage flow rate in wide range to display effect each one determining diameter , alignment, porosity, mean surface area pores size nan...

Progress in the electrospinning techniques has brought new methods for the production and construction of various nanofibrous assemblies. The parameters affecting electrospinning include electrical charges on the emerging jet, charge density and removal, as well as effects of external perturbations. The solvent and the method of fiber collection also affect the construction of the final nanofib...

In this paper it is shown how higher-dimensional solitons can be stabilized by a topological phase gradient, a field-induced shift in effective dimensionality. As a prototype, two instable 2-dimensional radial symmetric Sine–Gordon extensions (pulsons) are coupled by a sink/source term such, that one becomes a stable 1d and the other a 3d wave equation. The corresponding physical process is ide...

6.1 Chapter Summary Electrical charging and residual charge decay of electrospun nonwoven webs comprised of two electrically dissimilar polymers were studied in an effort to investigate their filtration properties. Electrospinning of polystyrene (PS) and polyacrylonitrile (PAN) was performed by utilizing three different approaches to produce thin fibrous webs: PAN and PS were electrospun indivi...

  Iontophoresis is one of the skin permeation enhancement methods involving the transport of drugs through the skin under the effect of electrical current. The effect of molecular charge on the iontophoretic permeation of drugs has not been completely understood yet. Therefore the effect of passive and iontophoretic permeation of L-phenylalanine at pH 3.6 (positive charge) and pH 8 (negative ch...