By K.L. Mittal, Dinesh O. Shah

ISBN-10: 0824708431

ISBN-13: 9780824708436

Investigates the function and dynamics of surfactants and their answer houses. bargains the most recent study and advancements within the realizing of surfactant habit in recommendations.

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Example text

As depicted in Fig. 26, very small additions of SDS were observed to have a dramatic effect on the formation of the surfactant surface structures. 1 M NaCl at pH 4 as a function of addition of SDS. At 5 ␮m SDS addition, no repulsive force is observed between the surfaces. However, at 10 ␮M SDS, strong repulsive force has developed and continues to increase with increase in SDS concentration. Correspondingly, over an identical range of SDS concentration, the initially unstable suspension becomes stabilized.

Based on the contact angle FTIR, zeta potential, and adsorption results, the preceding structural transitions are summarized by the schematic shown in Fig. 25, which illustrates the structures present at the interface in the concentration regions A–F in Fig. 24. A. Control of the Repulsion Barrier Using Cosurfactants In bulk micellization processes, it has been proposed that oppositely charged surfactant incorporates itself into micelles and by reducing the repulsion between the ionic groups increases stability and lowers the bulk cmc [82,83].

33% ical temperatures of superconductors produced by the traditional coprecipitation method. However, the fraction of the ideal Meissner shielding was strikingly different for the two samples prepared by different methods. It is the Meissner effect that is related to the levitational effect of the superconducting pellet on a magnetic field. Thus, it appears that the leakage of magnetic flux from the conventionally prepared sample was greater than that from the sample produced by microemulsion-derived nanoparticles.

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Adsorption and Aggregation of Surfactants in Solution by K.L. Mittal, Dinesh O. Shah

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