Abdelaziz Rahy

Novel and versatile process for the preparation of polyvinyl alcohol composite carbon nanotube fibers/yarns

We report our discovery of a new process to produce composite carbon nanotubes (CNT) fibers from single-walled carbon nanotubes (SWNTs), multi-walled nanotubes (MWNTS) or the combinations thereof utilizing already an adhesive (polymer) coated layer on polyethylene terephthalate (PET) film strip by simply applying CNT coating on the layer followed by an acid dipping. We also found that applying either an additional base treatment or an additional polyvinyl alcohol (PVA) polymer coating to the CNT-coated strip after the strip was dipped in acid enables us to achieve even higher mechanical properties compared to the former process.

Influence of Poly (Ethylene Glycol) and Oleylamine on the Formation of Nano to Micron Size Spherical SiO2 Particles

We report an eco-friendly synthesis of well–controlled, nano-to-micron-size, spherical SiO2 particles using non-hazardous solvent and a byproducts-producing system. It was found that the morphology and size of spherical SiO2 particles are controlled by adjusting the concentration of PEG and oleylamine, ethanol solvent selection, and reaction temperature. The SEM images show spherical-shaped silica particles with homogeneous particle-size distribution. Structural and optical properties of the silica particles were investigated by FT-IR absorption spectroscopy and photoluminescence. The resultant SiO2 particles from the synthesis system were easily dispersed in both water and organic solvent.

Immobilization of iron nanoparticles on multi substrates and its reduction removal of chromium (VI) from waste streams

This article describes the in-situ synthesis and immobilization of iron nanoparticles on several substrates at room temperature using NaBH4 as a reducing agent and ascorbic acid as capping agent. The method is very effective in protecting iron nanoparticles from air oxidation for more than 30 days. Substrates used to immobilize iron nanoparticles are spherical polymer resins (size of 100–200 mesh) and novel carbon substrates prepared from high temperature carbonization of e-spun nylon and polyacrylonitrile fabrics. Iron nanoparticles (40–100nm) immobilized sample showed higher activity for the reductive removal of hazardous hexavalent Cr (VI) compared to free floating iron nanoparticles at ambient temperature. Iron immobilized substrates has a great potential to be used not only for the removal of Cr (VI) in waste stream but also for oxygen scavenger for food packaging.

An electrochemical dopamine sensor based on a flexible conductive film of Single-Wall Carbon NanoTubes (SWCNT) on pet

This study investigates the potential application of a non-conventional substrate, a polyethylene terephthalate (PET) film treated with single-wall carbon nanotubes (SWCNT), as a dopamine sensor. The flexible and conductive SWCNT/PET substrate proved to be a sensitive dopamine sensor; it exhibited an excellent S/N ratio, good resistance to fouling, and rapid response characteristics. This approach may potentially be combined with screen-printing technologies for the production of conductive and flexible micro-electrode arrays with a multitude of biomedical sensing and point-of-care diagnostic applications.Copyright