November 22, 2019

the a result, nanofibers was been formed. analyze of

the equal distribution of electric potential on the
microneedle was caused the fine nanofibers.()(). as shown in figure6(a). along
increase distance from microneedle upto collector plane is displayed
various electric potential YZ made due to the variation of electric potential. As a
result, nanofibers was been formed. analyze of the electric field is done at
different horizontal line z=0, 100, 300, 500, 700, 900 and 1000µm in the XY
plane as shown in figure5(b). the max electric field was at the edges of the
microneedle and collector and the min amount was at the hole of microneedle
along z=0. Microneedle with edge was caused the max field intensity around it.
So polymer solution was stretched because of concentrate charges. As the distance
microneedle to horizontal line enhances the electric field decreases slowly as
long as it reaches to the collector with constant and low electric field.
Extension of the field was happened by increasing the distance from the
microneedle surface. So distance caused different field strength. Also vertical
lines with y=-500, 0, 500µm in the wasaltering distance between microneedle surface to
horizontal line graph with z=250, 500, 750 and 1000µm (on the collector) are
shown in figure4. As the distance microneedle to detachment horizontal
line  increases, the electric potential
decreases As shown in figure5(a). it was indicated that max and min electric
potential related to the microneedle tip and collector, respectively. Taylor
cone with The electric potential
(V) was applied to an aluminum sheet that microneedle array was mounted on it. The
surface that microneedle was extruded from it and microneedle tip were coated
with a 30nm gold layer. Potential of zero was put on the copper sheet that the
lam glass plate as the fiber collector was straddled on the copper surface. the
relationship between electric field and electric voltage

E= -?V    (1)

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The 3D electric field
and electric potential of the electrospinning system was examined using the
finite element method (FEM).The display of the electric field on Arrow and the
electric potential on contour were exhibited in figure1(b). So the distribution
of electric field was mentioned upgrade and electrospinning will be done with
the best results. The figure2 shows the distribution of the electric potential
on surface.The electric potential on surface at the microneedle tip with height
is displayed in interpolation of figure3(b) that a concentrated point of
voltage is observed. Max electric potential at microneedle surface is placed on
the microneedle because of microneedle?s length as shown in figure3(b).The
center region of the collector has smaller field intensity contrasted to the
corners of the collector as shown in figure3(a). The electric potential at the
collector surface with height in the microneedle system exhibits in the
interpolation of figure3(a). The electric field (E) was computed by the
gradient of electric potential (V), as shown in equation 1.

The system was simulated
using Comsol ® Ver 5.2 add-on AC/DC module under Windows 10 operating system
that microneedle electrospinning system was modeled for forming of spiral shape
single nanofiber and a spherical- shaped air environment was been modeled. At
first, the physical geometries of the setup, such as microneedle, collector and
the electrode were determined based on their experimental dimensions, positions
and substance properties. The configuration of a microneedle spinneret was
shown in figure1(a). The processing parameters were summarized in table 1.

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