Probing the surface of synthetic opals with the vanadyl containing crude oil by using EPR and ENDOR techniques

  title={Probing the surface of synthetic opals with the vanadyl containing crude oil by using EPR and ENDOR techniques},
  author={Marat Revgerovich Gafurov and Andrey V. Galukhin and Yuri N. Osin and Fadis F. Murzakhanov and Irina N Gracheva and Georgy Mamin and Sergei B. Orlinskii},
  journal={Magnetic resonance in solids},
Porous silica materials offer wide range of possibilities for enhancement of the productivity of oil reservoirs. However the mechanism of adsorption of polar components of crude oil on silica surface is poorly understood that hinders technological improvement of supports and oil extraction. We have synthesized opal films with the silica microspheres size of about 360 nm, specific surface area of 5.2 m2/g and pore size of 230 nm. We have fractionated and characterized oil and oil asphaltenes… 
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