Aggregation Behavior of Dimeric and Gemini Surfactants in Solution: Raman, Selective Decoupling ~(13)C NMR, and SANS Studies

摘要

The microstructures of the micelles formed by dimeric and gemini surfactants with a (CH_2)_s spacer (s = 2, 3, 4, 6, 8, 10, and 12) or an aromatic spacer (o-, m-, or p-phenylenedimethylene) have been investigated. Raman and selective decoupling ~(13)C nuclear magnetic resonance (NMR) spectra have provided evidence for a conformational change within these surfactants. The aggregational behavior obtained from the small-angle neutron scattering (SANS) data is discussed with respect to the relationship between the structure of the micelle and its conformation.