By K.L. Mittal, Dinesh O. Shah
Investigates the position and dynamics of surfactants and their resolution homes. bargains the most recent study and advancements within the realizing of surfactant habit in ideas.
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Additional info for Adsorption and Aggregation of Surfactants in Solution
Micellar stability is thus a critical issue in any application in which surfactants are present as micelles, and the subsequent monomer ﬂux is utilized in the application. IV. MICROEMULSIONS IN ENHANCED OIL RECOVERY AND SYNTHESIS OF NANOPARTICLES As early as 1943, Professor J. H. Schulman published reports on transparent emulsions . From various experimental observations and intuitive reasoning, he concluded that such transparent systems were microemulsions. Figure 13 illustrates the transparent nature of a microemulsion in comparison with a macroemulsion.
A good correlation exists between the suspension stability and repulsive forces due to self-assembled surfactant aggregates. The repulsive force is an order of magnitude higher than electrostatic forces alone, indicating that the repulsion is steric in origin. It was proposed that the dominant repulsion mechanism was the steric repulsion due to the elastic deformation of the self-assembled aggregates when two surfaces approached each other. 0 as a function of solution C12TAB concen- FIG. 1 M NaCl at pH 4 as a function of C12TAB concentration, and the measured interaction forces between an AFM tip and silica substrate under identical solution conditions.
Addition of 1 mM C12TAB further increased the mean particle size because the positively charged surfactant can screen more charges by adsorbing onto the silica particles. As described earlier, a jump was reported in the repulsive force barrier based on AFM force measurements at 8 mM C12TAB, which was explained on the basis of the strength of the self-assembled surfactant aggregates as they formed between the AFM tip and the substrate [78,79]. As the repulsive force is increased, the slurry particles are expected to start stabilizing in the presence of 8 mM C12TAB.
Adsorption and Aggregation of Surfactants in Solution by K.L. Mittal, Dinesh O. Shah