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Title
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The Surface Activity of Surfactants at Liquid Interfaces: The Role of CMC, Decrease in Surface Tension, HLB, Thermodynamic Adsorption Models
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Type
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JournalPaper
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Keywords
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adsorption kinetics | Frumkin adsorption model | partitioning coefficient | structure property relationship | surface coverage | surface tension isotherm
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Abstract
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For all applications in which interfaces play a significant role, surface-active agents (surfactants) can play an essential role. The selection of the most suitable surfactant is essential but it is not a simple task. Depending on the type of applications, a certain surface coverage by surfactant molecules or a reduction in surface tension down to a defined value is required. Moreover, the formation of micelles above a certain concentration in a solution can be essential for the optimized application of a surfactant. Hence, the classification of surfactants according to their surface activity is necessary and has to take into account a variety of characteristic parameters. This can be the critical micelle concentration (CMC), the corresponding surface tension (훾CMC), the maximum number of adsorbed surfactant molecules per interfacial area (훤 ∞) or the concentration required to reduce the surface tension by a certain amount. Different interfacial parameters are discussed with respect to their application and possible interrelations between these parameters are analyzed.
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Researchers
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Reinhard Miller (Third Researcher), Javad Saien (Second Researcher), (First Researcher)
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