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Unformatted text preview: Chapter 5- Amphipilic Systems- Liquid-Liquid Interfaces “The hallmark of a self-assembling process is that small departures from equilibrium reversibly drive molecular assembly. Such equilibrium can be affected through concentration, pH, temperature, etc. Amphiphilic systems exhibit the molecular properties related to equilibria lying near standard state conditions as well as structural forms required to produce nanometer scale, spatially variant structures. Chapter 5 Chapter 5 Amphiphilic Systems: Liquid Amphiphilic Systems: Liquid-Liquid Interfaces Liquid Interfaces KEY CONCEPTS KEY CONCEPTS (Note the application of key concepts from previous chapters (Note the application of key concepts from previous chapters in the present discussion) in the present discussion) • What are amphiphilic molecules (surfactants or surface active What are amphiphilic molecules (surfactants or surface active molecules) and what is the origin of their surface active behavi molecules) and what is the origin of their surface active behavi or? or? (Chemical structure of surfactant molecules; entropic effects) • Why and how these molecules self Why and how these molecules self-aggregate and what is the scientific aggregate and what is the scientific rationale for their self assembly? What parameters control the f rationale for their self assembly? What parameters control the f ormation ormation of different shaped structures? of different shaped structures? (Surfactant-solvent interactions; solvophobic effects and headgroup repulsion; critical micelle concentration (CMC); free energy of micelle formation; aggregation number (N o) ; self assembly of surfactants into spherical, bilayers, liquid crystals, vesicles, bicontinuous structures; mean curvature (H); surfactant number (N s )) • What are the practical applications of amphiphilic molecules and What are the practical applications of amphiphilic molecules and their their self assembled structures? self assembled structures? (Enhanced oil recovery; food; mineral recovery; oil spill remediation; soil remediation; detergents; cosmetics; healthcare products; pressure sensitive...
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- Spring '11
- Micelle, Amphiphilic Molecules