critical micelle concentration


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critical micelle concentration

[′krid·ə·kəl mi′sel ‚kän·sən′trā·shən]
(physical chemistry)
The concentration of a micelle (oriented molecular arrangement of an electrically charged colloidal particle or ion) at which the rate of increase of electrical conductance with increase in concentration levels off or proceeds at a much slower rate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The critical micelle concentration (CMC) of SDS in different electrolyte concentration was determined with a surfactant ion selective electrode (type 6.0507.120 Metrohm) that is sensitive to ionic surfactants [23, 24].
To determine critical micelle concentration (CMC), the surface tension was measured as a function of surfactant concentration.
Table 2: CMC and HLB values of surfactants (33) Surfactant CMC (mM) CMC (wt%) HLB Triton X-45 0.11 0.0045 9.8 Triton X-100 0.24 0.0150 13.4 Triton X-102 0.28 0.022 14.4 Triton X-405 0.81 0.16 17.6 CMC, critical micelle concentration A number of studies cited above (1), (3-9), (13-15), (17), (19), (20), (22-25), (27-31) addressed the effect of surfactants on the behavior of HEUR, HASE, and HMHEC associative thickeners.
(5) The preferred polymers interact with the surfactant and effectively shift the critical micelle concentration (CMC) to higher concentrations, while lowering the critical aggregation concentration; the latter being the concentration at which the surfactant selectively interacts with the polymer rather than adsorbing at the liquid surface (Figure 1).
It is also important to state that in the available data molecular diffusion coefficient, critical micelle concentration (CMC) and capillary number are not available (Nc), but they are needed in simulation with CMC, So one of the purposes of this simulation is to find these unknown but important parameters.
For non-ionic surfactants, the critical micelle concentration (CMC) is usually low (between 0.01 mol/[m.sup.3] and 0.1 mol/[m.sup.3]).
The critical micelle concentration (CMC) is the concentration of the HA solution at which the surface tension is the minimized (Lowe, 1999).
carried out an investigation for the determination of the critical micelle concentration (CMC) of long-chain imidazolium based ILs and with the respective chain length of alkyltriammonium salts in water and 20 mM phosphate buffer.
This results in a significantly lower critical micelle concentration (CMC) and a far higher surface activity (factor up to 100x/1000x), making them quite efficient.
For surface chemistry, dynamic contact angle, surface tension and critical micelle concentration systems are highlighted.
Options include a Critical Micelle Concentration (CMC) accessory and Advantage advanced calculation software.
A fluorescence probe, N-phenylnaphlylamine, was used to estimate the critical micelle concentration (CMC) and the polarity of the hydrocarbon core of the micelle.

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