الفهرس 
CHAPTER I INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
In this work, rapid, simple and cheap methods are presented for the green
synthesis of silver nanoparticles (AgNPs) using morin as a reducing agent without
utilizing any toxic reagents.
Morin/silver nanoparticles/polyvinyl alcohol (morin/AgNPs/PVA)
nanocomposite was synthesized by a liquid-phase route using PVA as a stabilizer.
Tuning of the experimental parameters allowed control of the size and size
distribution of the NPs. UV-visible (UV-vis) spectroscopy had been utilized to
monitor the spectral profile changes of the surface plasmon resonance (SPR) band
of AgNPs at various conditions. The prepared nanocomposite was structurally
characterized by transmission electron microscopy (TEM) and X-ray diffraction
(XRD). The antimicrobial activity of the prepared morin/AgNPs/PVA was
evaluated. Furthermore, a cross-linked free-standing film of morin/AgNPs/PVA
was prepared and used as a catalyst for the reduction of 4-nitrophenol (4-NP). This
provides an effective method to recover the nanocatalyst easily after finishing the
reaction and obtain the product free from the metal. The catalytic experiment was
carried out under different operational parameters to identify the optimal
conditions for the model solutions.
On the other hand, a solid-state method for large-scale production of
morin/AgNPs (by ball milling) had been developed. The synthesized morin/AgNPs
were characterized by different spectroscopic techniques. The prepared
morin/AgNPs showed higher antioxidant and antimicrobial activities compared to
morin. The use of a solid-state method would avoid long term storage issues
(aggregation/agglomeration and/or oxidation) through the production of
nanoparticles in a dry form. The shipping costs would be reduced, and mass
production could be attained without the need for drying, concentrating, or
separation