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Structural and thermodynamic signatures of marine microlayer surfactant films
Pogorzelski, S.J.; Kogut, A.D. (2003). Structural and thermodynamic signatures of marine microlayer surfactant films. J. Sea Res. 49(4): 347-356. https://dx.doi.org/10.1016/s1385-1101(03)00038-8
Also appears in:
Ohlson, M.; Omstedt, A.; Turner, D. (Ed.) (2003). Proceedings of the 22nd Conference of the Baltic Oceanographers (CBO), Stockholm, Sweden, 25-29 November 2001. Journal of Sea Research, 49(4). Elsevier: Amsterdam. 227-374 pp., more
Peer reviewed article  
Available in  Authors 
Keywords
    Agents > Surfactants
    Physics > Mechanics > Dynamics > Structural dynamics
    Properties > Physical properties > Thermodynamic properties
    Properties > Physical properties > Thermodynamic properties > Enthalpy
    Properties > Physical properties > Thermodynamic properties > Entropy
    Surface films
    ANE, Baltic, Gdansk Gulf [Marine Regions]
    Marine/Coastal
Author keywords
    southern Baltic; Gulf of Gdansk; surfactant films; isotherm scaling;surface thermodynamics; visco-elasticity
Authors  Top 
  • Pogorzelski, S.J.
  • Kogut, A.D.
Abstract
    Natural surface film experiments in inland waters and shallow offshore regions of the Baltic and Mediterranean Seas were carried out in the time period 1990-1999 under calm sea conditions using a novel device for sampling and force-area studies. The sampler-Langmuir trough-Wilhelmy filter paper plate system `cuts out' an undisturbed film-covered sea area to perform pi-A studies without any initial physico-chemical sample processing. The limiting specific area Alim (2.68-31.57 nm2/molecule) and mean molecular mass Mw (0.65-9.7 kDa) of microlayer surfactants were determined from the 2D virial equation of state applied to the isotherms. Enthalpy deltaH and entropy deltaSt of the 2D first-order phase transitions were evaluated using the Clausius-Clapeyron equation applied to the isotherms. Miscibility of film components and film structure evolution is expressed by the scaling exponent y adopting the 2D polymer film scaling theory. The stress-relaxation measurements revealed a two-step relaxation process at the interface with characteristic times T1=1.1-2.8 and T2=5.6-25.6 seconds suggesting the presence of diffusion-controlled and structural organisation relaxation phenomena. The obtained results suggest that natural films are a complex mixture of biomolecules covering a wide range of solubilities, surface activity and molecular masses with an apparent structural organisation exhibiting a spatial and temporal variability.
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