Quantum-confined Bi structures (quantum wells and quantum wires) are currently being studied for their varies novel properties. We now pursue the next level of quantum confinement in bismuth, quantum dots. In this work, we present a technique for the synthesis of bismuth nanoparticles using an inverse microemulsion method. To prevent air-oxidation in the characterization stage, poly(vinylpyrrol...

In this article, we describe a microfluidic approach to fabricate hollow and core/sheath nanofibers by electrospinning. Key benefits in using microfluidic devices for nanofiber synthesis include rapid prototyping, ease of fabrication, and the ability to spin multiple fibers in parallel through arrays of individual microchannels. Hollow poly (vinylpyrrolidone) (PVP) + titania (TiO2) composite an...

Aqueous Mizoroki-Heck coupling reactions under microwave irradiation (MW) were carried out with a colloidal Pd nanocatalyst stabilized with poly(N-vinylpyrrolidone) (PVP). Many stilbenes and novel heterostilbenes were achieved in good to excellent yields starting from aryl bromides and different olefins. The reaction was carried out in a short reaction time and with low catalyst loading, leadin...

With the goal to better process monitoring of occurring fouling, a backscatter probe was developed perform in-line measurements in half-shell reactor during reaction N-vinylpyrrolidone (NVP) polyvinylpyrrolidone (PVP). The measurement technique detects changes bands UV range, which allows direct correlation with concentration. Thus, measured absorbance signal conclusion on accumulation fouling ...

The effect of poly-N-vinylpyrrolidone on the size characteristics, morphology, composition particles obtained by reduction cobalt ions in aqueous solutions, and distribution over surface glass microspheres has been studied. absence leads to formation with a 200 nm microspheres. use made it possible obtain ranging from 30 300 nm, more localized resulting are mixture metallic oxides.

Polyurethane based tri-block copolymers namely poly(N-vinylpyrrolidone)-b-polyurethane-b-poly(N-vinylpyrrolidone) (PNVP-PU) and poly(dimethylaminoethylmethacrylate)-b-polyurethane-b-poly(dimethylaminoethylmethacrylate) (PDMAEMA-PU) were synthesized through atom transfer radical polymerization (ATRP) mechanism. The synthesized polymers were characterized using nuclear magnetic resonance (NMR) sp...

Polymer fouling is a major problem for the operation of continuous reactors. Therefore, it important to understand and quantitatively describe mechanisms leading formation deposits. In this work, CFD model radical polymerization N-vinylpyrrolidone presented, where reaction kinetics, viscosity model, transport polymer moments are determined from independent experiments. The compared experimental...