Abstract Polymer flooding and polymer/surfactant have achieved good efficiency in the application of conventional reservoir, but existed chemical technology cannot address issues requirements high salinity reservoir. Under condition due to increase calcium magnesium ions, increasing viscosity effect oil displacement system is lost. In order study feasibility applying nanomaterials field enhance...

a highly efficient method for the oxidation of aldehydes to carboxylic acids using polyvinylpolypyrrolidone supported - boron trifluoride (pvpp-bf3) in the presence of 35% hydrogen peroxide has been developed in acetonitrile at 60 °c. this procedure cleanly oxidizes variety of aldehydes to the corresponding carboxylic acids. oxidative esterification of benzaldehyde utilizing pvpp-bf3/h2o2(35%) ...

Rice husk is considered a main agricultural waste in Iraq. High purity SiO2 NPs were produced from rice by enhanced precipitation and developed leaching processes for the preparation of silica RH. In this study, pre-treatment was with 3N HCl, calcination at 700°C achieved, then followed process (1.5, 2, 2.5, 3) N NaOH concentrations. The characterizations prepared studied X-ray fluorescence (XR...

The BF3.OEt2-catalyzed Friedel-Crafts propargylation of aromatic compounds with O-propargyl trichloroacetimidates is highly efficient and affords 1,3-diarylpropyne derivatives in good yields.

The stereospecific and regioselective C(3) alkynylation of trisubstituted epoxides has been achieved with lithium alkynyl trimethylaluminium ate complexes in the presence of BF3 x OEt2.

Nanoparticles (NPs) of noble metals can strongly absorb visible light because of their plasmon resonance, which is greatly influenced by their morphology and size. The phenomenon of plasmon resonance gives rise to important applications such as colorimetric sensors, photovoltaic devices, photochromic devices, and photocatalysts. Noble metal NPs exhibit characteristic optical and physical proper...