15 Questions
Surfactant molecules in the bulk form aggregates called micelles, where the hydrophilic heads are hidden from water.
False
The critical micelle concentration (cmc) is the concentration at which the micelles first form in solution.
True
Micelle formation increases the system free energy (entropy).
False
Normal micelles are formed in the oil phase.
False
Micelles have a hydrophobic core surrounded by a hydrophilic shell.
True
Normal micelles are formed in the aqueous phase.
True
The driving force for micelle formation is the attainment of a maximum free energy state.
False
Micelle formation is the result of SAA molecules in the bulk forming aggregates where the hydrophobic tails are hidden from water.
True
The critical micelle concentration (cmc) is the concentration at which the micelles first form in solution.
True
Basic micelles are spherical and have a size in the colloidal range (nm).
True
What is the critical micelle concentration (cmc)?
The concentration at which the micelles first form in solution
What is the driving force for micelle formation?
Attainment of a minimum free energy state
Which type of micelles have a hydrophobic core surrounded by a hydrophilic shell?
Normal micelles
What is the main feature of normal micelles?
Contain between 60 and 100 surfactant molecules
How are micelles formed in the bulk?
SAA molecules form aggregates where the hydrophobic tails are hidden from water
Test your knowledge on micellisation and pharmaceutical applications of surface-active agents (SAA), including defining SAA structure, illustrating activity mechanisms, classifying based on polar head type, understanding cmc and micellar structures, and applying SAA in pharmaceutical formulations.
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