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Description:
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A new fabrication process of organic and inorganic nanoparticles and cups by
electrospraying blended polymer -sol -gel solutions followed by calcination has been
investigated . Because of low viscosity and high surface tension of blended polymersol -
gel solutions , an electrostatically extruded continuous liquid jet from the spray
source became tiny droplets with diameter of less than 1µm in transit . They were
collected as dried formats at the counter electrode . These are then calcinated to
eliminate polymers as well as cross -link sol -gel material . Silica nanocups have been
fabricated using the above technique and the probable methods to control their morphology
by varying the ionic concentration have been investigated . Experiments with
biodegradable polymers , like Poly Lactic Acid (PLA ) and polyvinylpyrrolidine (PVP )
to fabricate nanoparticles using the above technique , have also been carried out . The
potential use of such biodegradable particles in drug delivery has been demonstrated .
This method can encapsulate drug in the particles without the need of any stabilizer
which can cause unwanted effect on the drug . The effect of solvents , polymer
concentration and deposition distance on morphology and diameter of particles was
also investigated on PLA particles . This process is a simple and efficient approach
for producing nanocomposite cups that cannot be made by an aggregation method
and also nano /micro particles which may find their use in drug delivery and filtration
media . Finally , a new technique to sort the particles based on their dimensions is
demonstrated . Because of interactions between charged droplets and a non -linear electrostatic field , nanoparticles with different dimensions are deposited at different
locations . By using this principle , silica nanocups have been sorted into three groups
with mean diameters of 0 .31 µm , 0 .7 µm and 1 .1µm and a standard deviation of 20 % . |