The present study concentrates on the synthesis of Au nanoparticles (AuNPs) using aqueous solution of Polyvinylpyrrolidone (PVP) and tetrachloroaurate by different methods as thermal, sonochemical and electrochemical reduction. The PVP has been used as a reducing agent and acts as a stabilizer for Au nano particles that obtained as principal product. In all synthesis procedures, the active radi...

The aim of this study was to develop celecoxib (CLX) -polyvinylpyrrolidone (PVP) solid dispersion nanoparticles with and without surfactant using the supercritical antisolvent (SAS) process. effect different surfactants such as gelucire 44/14, poloxamer 188, 407, Ryoto sugar ester L1695, D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) on nanoparticle formation dissolution well oral abs...

Zinc sulfide semiconductor nanoparticles were synthesized in an aqueous solution of polyvinyl pyrrolidone via a simple microwave irradiation method. The effect of the polymer concentration and the type of sulfur source on the particle size and dispersion of the final ZnS nanoparticle product was carefully examined. Microwave heating generally occurs by two main mechanisms: dipolar polarization ...

Abstract Nano scale fibers of SiO 2 and TiO with various compositions viscosity parameter have been prepared by electrospinning the precursor tetraethyl orthosilicate (TEOS) titanium (IV) isopropoxide (TiP). Different concentrations polymer polyvinylpyrrolidone (PVP) applied voltages were studied. Distance tip to collector 15 cm flow rate 0.003 mL/h fixed for entire process. The morphology nano...

BACKGROUND Povidone iodine (PVP-I) is a chemical complex of polyvinylpyrrolidone (also known as povidone or PVP) and elemental iodine. Iodine containing compounds are widely and commonly used as antiseptics and disinfectants. They are available in various forms like aqueous solution, tincture, aerosol, ointment, or foam. Skin irritation to them is due to the oxidative effects of iodine. Because...

The concept of shape-controlled synthesis is discussed by investigating the growth mechanisms for silver nanocubes, nanowires, and nanospheres produced through a polymer-mediated polyol process. Experimental parameters, such as the concentration of AgNO(3) (the precursor to silver), the molar ratio between poly(vinylpyrrolidone) (PVP, the capping agent) and AgNO(3), and the strength of chemical...

The adsorption of polyvinylpyrrolidone (PVP) by the thermoregulating microcapsules has been studied. The mass ratio of PVP has been changed from 1 to 20, with respect to the lowest amount of PVP value (4.08 g). The results confirmed that a large amount of PVP was adsorbed by the polymeric shell. Experimental data were perfectly fitted by Langmuir model, obtaining at a confidence level of 95% va...

Abstract Diverse wet adhesives were prepared from oleic acid (OA), polyvinyl pyrrolidone (PVP), and cis -1,4-polyisoprene (PI) at different ratios for attracting trapping insects. The of (PVP-PI)/OA 1:2, 1:1 2:1 (g/g). ratio between PVP PI was 9 to 1 blends irradiated with doses 10 50 kGy. Adhesion properties, water sorption, Fourier transform infrared spectroscopy, thermogravimetric analysis s...

We contrast the adsorption, over a wide range of pH and ionic strength, of polyelectrolyte chains with different fractions of charged segments but similar degree of polymerization. The system was a cationic polymer, poly~1,4 vinyl!pyridine ~PVP!, with 14%, 48%, and 98% quaternized repeat units, adsorbed from aqueous solution ~D2O or H2O! onto a single silicon oxide substrate at 25 °C. Measureme...

A novel supersaturable self-emulsifying drug delivery system (S-SEDDS) of cyclosporine A (CyA)—a poorly water-soluble immunosuppressant—was constructed in order to attain an apparent concentration–time profile comparable to that of conventional SEDDS with reduced use of oil, surfactant, and cosolvent. Several hydrophilic polymers, including polyvinylpyrrolidone (PVP), were employed as precipita...