Hemimicelle admicelle

Although the partitioning of HOCs to surfactant micelles has been well studied, HOC partitioning to sorbed surfactants (e.g., hemimicelles, admicelles) has received much less attention. Holsen et al. (1991) examined the sorption of several HOCs on ferrihydrite coated with sodium dodecyl sulfate (SDS) and found that the HOCs with the lowest water solubility... 

Surface aggregates formed by ionic surfactant adsorption on oppositely charge surfaces have been shown to be bi layered structures (1.) and are called admicelles<2) in this paper, though they are sometimes referred to as hemimicelles. The concentration at which admicelles first form on the most energetic surface patch is called the Critical Admicellar Concentration (CAC) in analogy to the Critical Micelle Concentration (CMC), where micelles are first formed. Again, in much of the literature, the CAC is referred to as the Hemimicellar Concentration (HMC). 

There have been several surfactant structures proposed in attempts to describe the adsorption isotherm. Two of them have been mentioned already, the hemimicelle and local bilayer or admicelle. In 1955, Gaudin and Fuerstenau [40] introduced the term hemimicelle to describe the adsorption behavior they had observed in region II. Hemimicelles can be described as aggregates of adsorbed surfactant molecules in which the... 

Region 2 indicates the formation of surfactant aggregates (called admicelles or hemimicelles) which produces the sharp increase in the slope of the isotherm. 

All of this suggests that at the c.i.p. the first layer is completed. The surfactants are not adsorbed as hemimicelles or admicelles [7—9]. 

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