Mechanism And Foam Study On The Interaction Between Nanoparticles And Ionic Surfactants

With the increasingly shortage of the world oil resources,it has been an important method for the research of foam flooding and other EOR technology to ensure the reutilization of waste storage.Using inorganic nanoparticles as foam stabilizer showed decent foam stabilizing effect under some condition,and also showed many advantage.In this paper,foam stabilization and mechanism and on the interaction between SiO2 nanoparticles and ionic surfactants was studied in detail.Firstly,the pure ionic surfactants solution was studied via dynamic oscillation.It was observed that the surface viscoelasticity reached the peak at concentration of 0.40 – 0.67?cmc and quickly declined with concentration increase.The underlying mechanism has been discussed by taking account of the possible premicelle formation before the cmc through simplified method to study the number of pre-micelles.On the base of only ionic surfactants solution's research,the possible self-assembly mechanism between SiO2 nanoparticles and ionic surfactants was discussed via Zeta,dynamic and static surface tension,etc.The surfactant molecules were dissociation in the pre-micelle state and stated to move to the particles surface drove by the hydrophobic force when the SiO2 hydrophobic nanoparticles were added.The molecules on the air-water interface started to move to particles surface when more nanoparticles were added.With the increase of the concentration,the surfactant molecules began to move towards the surface of the particles in liquid surface.Particles move to the air-water interface drove by the hydrophobic force when particles were excess.Particles were coagulation when particles were excess.With the increase of the concentration of particles,the surfactant molecules began to move towards the surface of the particles in liquid surface.There are no interaction occurred when SiO2 hydrophilic nanoparticles were added in the solution of anion surfactants.The possible foam-stabilizing mechanism was discussed based on the studies mentioned above.For the cation surfactants,the foam coalescence and film drainage were hindered which SiO2 nanoparticles were added and formed the stable unit drove by hydrophobic and charge force respectively.The added of SiO2 hydrophilic nanoparticles only increased the viscosity of film while the film drainage were hindered slightly.To verify the universal applicability of the above mechanism,a new ionic surfactant ionic liquid surfactant hexadecylpyridinium chloride(CPC)was chosen,and the interactive behavior of SiO2 nanoparticles and CPC was investigated.The CPC oil applied experiments were produced.It was found that as a foaming agent,CPC can instead the normal surfactant which used in tertiary oil recovery and the mechanism has universal applicability.