In mixed lipid monolayers (DPPC-Cholesterol), I observe a non monotonous behavior on the elastic modulus. It shows a decreasing trend, reaches a minimum and then it increases at high frequencies.
This minimum of G' also seems to depend on cholesterol concetration as it shifts to lower frequencies with chol increase
Could chol affect the system in such a way to cause this behavior?
I assume that it has to do with the relaxation and the time scales, and due to the structural changes that chol causes to the DPPC domains.
Yes, the elastic modulus of mixed lipid monolayers can exhibit non-monotonous behavior during a frequency sweep experiment. This behavior is often observed in complex systems like lipid monolayers due to interactions between different lipid species. Depending on factors such as lipid composition, temperature, and surface pressure, you may observe variations in the elastic modulus as a function of frequency. These variations can be attributed to phase transitions, structural changes, or interactions between the lipid molecules within the monolayer. Experimental conditions and the specific lipid mixtures will influence the nature and extent of non-monotonous behavior in the elastic modulus.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Inorganic Materials
- Ceramics
- Glass