If NPs and surfactant mix together in water for EOR processes, what interaction they can make to each other? and what technique we can use to confirm the interaction or the structure?
If silica is hydrophobic, then you will see the NP is engulfed by the micelles.
Our recent paper deals with NP interactions with membranes: Hope you will find it interesting.
Article Stability of Lipid Coatings on Nanoparticle-Decorated Surfaces
Virendrakumar Patel
Silica nanoparticles and zwitterionic surfactants have amphoteric properties. Depending on the pH, their molecules and the surface of nanoparticles have a positive and negative charge. At a certain pH (isoelectric point), the charge disappears, they will not move to the electrode and their charges interact inside the molecule. When present together in water, a joint isoelectric point appears. In this case, the pH interaction between the silica surface with the zwitterionic surfactant will be maximum.
Exactly what Professor Yuri Mirgorod said. The zwitterionic property is pH dependant and the resultant charge will be recalculated based on the same. The term isoelectric point can be used here. Water is not the matter here, the matter will be the behaviour of both surfactant and particles at the lower and upper pH of that isoelectric point.
Dear Virendrakumar Patel, if you add surfactant and silica nanoparticle simultaneously then it has a possibility that your resultant might be a surfactant grafted silica with low yield. Since silica(assuming hydrophilic) nanoparticle charge is pH-dependent and is generally negative above pH of 8 and at a negative surface charge will attract the positive head of your zwitterionic surfactant thus resulting the grafting of surfactant on silica nanoparticle. which can be generally confirmed with the FTIR study of resultant nanoparticles and bare nanoparticles.
if your system satisfies these conditions then this might be a case to be considered.
Marziye Mahmoudian
You need to clarify the question. Direct and reverse emulsion can be stabilized. Which surfactants to use depends on this. The emulsion can be stabilized with nanoparticles or surfactants.
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