the equal distribution of electric potential on themicroneedle was caused the fine nanofibers.()(). as shown in figure6(a). alongincrease distance from microneedle upto collector plane is displayedvarious electric potential YZ made due to the variation of electric potential. As aresult, nanofibers was been formed. analyze of the electric field is done atdifferent horizontal line z=0, 100, 300, 500, 700, 900 and 1000µm in the XYplane as shown in figure5(b). the max electric field was at the edges of themicroneedle and collector and the min amount was at the hole of microneedlealong z=0.
Microneedle with edge was caused the max field intensity around it.So polymer solution was stretched because of concentrate charges. As the distancemicroneedle to horizontal line enhances the electric field decreases slowly aslong as it reaches to the collector with constant and low electric field.Extension of the field was happened by increasing the distance from themicroneedle surface. So distance caused different field strength. Also verticallines with y=-500, 0, 500µm in the wasaltering distance between microneedle surface tohorizontal line graph with z=250, 500, 750 and 1000µm (on the collector) areshown in figure4. As the distance microneedle to detachment horizontalline increases, the electric potentialdecreases As shown in figure5(a). it was indicated that max and min electricpotential related to the microneedle tip and collector, respectively.
Taylorcone with The electric potential(V) was applied to an aluminum sheet that microneedle array was mounted on it. Thesurface that microneedle was extruded from it and microneedle tip were coatedwith a 30nm gold layer. Potential of zero was put on the copper sheet that thelam glass plate as the fiber collector was straddled on the copper surface.
therelationship between electric field and electric voltage E= -?V (1)The 3D electric fieldand electric potential of the electrospinning system was examined using thefinite element method (FEM).The display of the electric field on Arrow and theelectric potential on contour were exhibited in figure1(b). So the distributionof electric field was mentioned upgrade and electrospinning will be done withthe best results. The figure2 shows the distribution of the electric potentialon surface.The electric potential on surface at the microneedle tip with heightis displayed in interpolation of figure3(b) that a concentrated point ofvoltage is observed.
Max electric potential at microneedle surface is placed onthe microneedle because of microneedle?s length as shown in figure3(b).Thecenter region of the collector has smaller field intensity contrasted to thecorners of the collector as shown in figure3(a). The electric potential at thecollector surface with height in the microneedle system exhibits in theinterpolation of figure3(a). The electric field (E) was computed by thegradient of electric potential (V), as shown in equation 1. The system was simulatedusing Comsol ® Ver 5.2 add-on AC/DC module under Windows 10 operating systemthat microneedle electrospinning system was modeled for forming of spiral shapesingle nanofiber and a spherical- shaped air environment was been modeled. Atfirst, the physical geometries of the setup, such as microneedle, collector andthe electrode were determined based on their experimental dimensions, positionsand substance properties.
The configuration of a microneedle spinneret wasshown in figure1(a). The processing parameters were summarized in table 1.