Abstract
Order parameter theories are comprehensively studied for electron spin resonance (ESR) line shapes of micellar and lamellar liquid-crystalline phases. Theoretical spectral analysis is performed based on a general two-dynamic (TD) model to test the validity of two order-parameter (OP) models. The consequence of improper use of these OP models is discussed in terms of the model parameters. A successful application of the OP models is presented for the micellar and lamellar liquid-crystalline phases of the binary system potassium oleate/water (KOW). Our spectral simulation results reveal a concentration-independent molecular order and a continuous increase of local molecular reorientational dynamics with increasing water content, irrespective of the phase transitions. A comparison is made for the dynamic parameters between the KOW and oleoyllysolecithin (OILPC)/water systems. The difference is explained in terms of the ratio between the headgroup area and the acyl chain area.
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