RT - Journal Article T1 - Investigation of TiO2 Nanoparticles used in Enhanced Oil Recovery by Optical Scattering Method JF - opsi YR - 2015 JO - opsi VO - 21 IS - 0 UR - http://opsi.ir/article-1-626-en.html SP - 465 EP - 468 K1 - Light scattering K1 - Nanopaticle K1 - Titanium dioxide K1 - Second virial coefficient K1 - Refractive index AB - Application of titanium dioxide nanoparticles in low concentration has significant improvement in enhanced oil recovery which this observation needs new models. In this research, light scattering of nanoparticles with diameter of 35 nm in different concentration were measured and based on Debye plot molecular weight and 2nd virial coefficient were calculated. For this purpose, refractive index increment was needed which was measured using Michelson interferometer method. Based on 2nd virial coefficient, the osmotic pressure of the nanoparticles was calculated. The result indicates that in low concentration of nanoparticles this pressure is not the main mechanism of oil detaching from rock surface. LA eng UL http://opsi.ir/article-1-626-en.html M3 ER -