Fabrication of Te Micro-Tubes and TeO2 Micro-Wires From Powders by Cold Spray

A one-dimensional micro-structured tellurium (Te) microtube and tellurium dioxide (TeO2) microwire were successfully prepared by cold spray process in large scale by a facile approach of sprayed (Te), (TeO2) dry powder in an inert atmosphere using helium gas onto glass substrate. Tellurium and Tellurium dioxide were sprayed by heating carrier gas at (200,300,400 and 500 °C) and 2 MPa pressure on the glass substrate (100°C). Heat treatment was done under vacuum (0.0133mbar) for (30 min) at (200°C) for Te and (400°C) for TeO2.The prepared microtubes and microwire was examined by XRD, AFM and SEM. The result showed that the obtained microtubes and microwire were highly pure

EXPERIMENTAL INVESTIGATION ON NATURAL POLYMER GRAFTED SINGLE AND HYBRID NANOPARTICLES BASED NANOFLUIDS FOR ENHANCED OIL RECOVERY

Nanoparticles have been utilized in chemical-enhanced oil recovery (C-EOR) as a reliable and potential alternative to conventional EOR additives (surfactant and polymer) and an innovative technique for improving different mechanisms in the EOR process. Despite their effectiveness in EOR, their suspensions suffer from low colloidal stability when exposed to harsh reservoir conditions of high salinity and high temperature (HSHT). Recently, polymer grafted nanoparticles surfaces have garnered significant attention as a new trend of nanomaterials for EOR application due to their remarkable properties in improving the dispersion stability with excellent tolerance in HSHT conditions. The reciprocal performance of grafting polymer on the surface of nanoparticles to enhance the microscopic and macroscopic mechanisms of oil displacement efficiency is still insufficiently identified. In this study, different structures of nanoparticles (0-D and 2-D); namely silica (SiO2), alumina (Al2O3), and graphene nanoplatelets (GNPs), were successfully grafted with a natural polymer, Gum Arabic (GA) and later combined to formulate novel hybrid nanofluids via a simple and eco-friendly process