Micelles mass fraction

Figure I. Change in surfactant morurmer and micelle mass fraction as a /unction of total surfactant concentration.

One unifying rule accounting for block copolymer micelle morphology has been proposed by Discher and Eisenberg [239]. This rule should be considered for coil-coil block copolymer readily soluble in the selective solvent and is expressed as a function of the mass fraction of the hydrophilic block to total mass of the copolymer (/hydrophilic)-... 

The surfactant mass fraction in a microemulsion defines the size of the interfacial area between the water and oil. The reaction rate of organic reactions in microemulsions can be dramatically enhanced by increasing the specific interfacial area [95]. Enzyme catalysis in microemulsions is usually not influenced by the size of the interfacial area because only a small fraction of the reverse micelles are hosting a bio-molecule. Most investigations published so far were made with low enzyme concentrations resulting in a low population of enzymes per reverse micelle. 

A mass action model (MAM) with monodisperse aggregation number N which depends on the micelle mole fraction x and the counterion binding parameter /3(x) has been developed for binary surfactants either ionic/ionic or nonionic/ionic. 

If the KEP-2 solubihty from the isotherms of surface tension of surfactant solutions in PTMG is compared with the data in [11], which reports that the KEP-2 fraction in PPG corresponding to the critical concentration of micelle formation (CCMF) is 2.5 x 10 , it is evident that KEP-2 solubility in these simple oligoglycols differs tenfold. Temperature dependences of the surface pressime of KEP-2 solutions in PTMG obtained from the experimental isotherms of surface tension at all the investigated mass fractions of KEP-2 are linear. 

Armstrong and Nome [1] extended to micellar media the classic model of Martin and Synge, and Herries et al. [8]. The model describes the situation that a solute experiences in an ideal system formed of a number of identical plates, where partitioning equilibria take place. The transitions that can occur in the three environments that exist in a micellar chromatographic system i.e., the aqueous phase, the micelles and the stationary plmse) were considered (Fig. 5.1). The mass fraction of solute in each environment and each theoretical plate was obtained from P m and Pws The P s coefficient was not included in the model, since it can be obtained by combination of the two former (P g Pws/Pwm)-... 

FIG. 8 Crystallization of calcium oxalates in the presence of anionic surfactants (0.3 M sodium chloride solutions supersaturated to COM and COD, pH 6.5, temperature 37°C). Changes in the mass fraction of COD in the precipitate are shown as a function of the surfactant concentration expressed in multiples of the respective critical micelle concentrations (erne s). The mass percent of COD (vertical axis) was calculated from thermogravi-metric data assuming a formula C2O4 2H2O for COD. (After Ref. 62.)... 

Calculate the mass per particle and the gram molecular weight of the two micelle fractions, assuming p = 1.43 g cm-3 for the dispersed phase. 

---