The interfacial behavior of surfactant in the presence of silica nanoparticles may be explained in the following way. At zero or very low surfactant concentrations (Region 1), the utilized parti- cles are completely wetted by water so that they remain in the bulk solution and do not prefer the interface (Ravera et al., 2006; Ahualli et al., 2011). The behavior observed in region 2 may be interpreted using different approaches. First is that as the surfac- tant concentration increases, the repulsive electrostatic forces between the particles and the SDS promotes the surfactant diffusion toward the interface, which leads to a decrease in the surface tension (Ma et al., 2008). Another approach says that increasing the surfactant concentration implies an increase in the surface coverage of the nanoparticles and, as a consequence, a greater affinity of the particles for the fluid interface (Ravera et al.,
2006). Thus, the number of particles at the interface rises with surfactant concentration. Such particles containing a large amount of surfactant can act as carriers of SDS toward the interface.
The interfacial behavior of surfactant in the presence of silica nanoparticles may be explained in the following way. At zero or very low surfactant concentrations (Region 1), the utilized parti- cles are completely wetted by water so that they remain in the bulk solution and do not prefer the interface (Ravera et al., 2006; Ahualli et al., 2011). The behavior observed in region 2 may be interpreted using different approaches. First is that as the surfac- tant concentration increases, the repulsive electrostatic forces between the particles and the SDS promotes the surfactant diffusion toward the interface, which leads to a decrease in the surface tension (Ma et al., 2008). Another approach says that increasing the surfactant concentration implies an increase in the surface coverage of the nanoparticles and, as a consequence, a greater affinity of the particles for the fluid interface (Ravera et al.,2006). Thus, the number of particles at the interface rises with surfactant concentration. Such particles containing a large amount of surfactant can act as carriers of SDS toward the interface.
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