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    Entropy of aqueous surfaces. Application to polymeric Langmuir films

    Year: 2017

    Journal: Adv. Colloid Interface Sci., Volume 247, SEP, page 149–162

    Authors: Deschenes, Louise; Lyklema, Johannes; St-Germain, Francois

    Organizations: Agriculture and Agri-Food Canada (RBPI) [1480]

    Keywords: Surface entropy; Surface tension; Langmuir monolayers; PEO; PPO; Jones-Ray effect

    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.
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