Measuring surface (excess) entropies provides a bounty of valuable structural information that is hard to obtain otherwise. In the paper these quantities are defined and procedures of measurements discussed. Mostly they involve measurements at different temperatures. A review is given for interfaces with aqueous solutions in the absence of polymers. This review illustrates how, sometimes unanticipated, pieces of information are obtained, for example with cloud seeding and a possible explanation of the Jones-Ray effect. As a novel extension the procedure is applied to deposited, or Langmuir, monolayers of poly(ethylene oxide)-poly(propylene oxide) block copolymers. It will be shown how the various phase transitions and associated configurations of these polymers can be recognized and monitored.
- Jones-Ray effect
- Langmuir monolayers
- Surface entropy
- Surface tension
Deschênes, L., Lyklema, H., & St-Germain, F. (2017). Entropy of aqueous surfaces. Application to polymeric Langmuir films. Advances in Colloid and Interface Science, 247, 149-162. https://doi.org/10.1016/j.cis.2017.04.004