Static and dynamic properties of surfactant films on natural waters

• Autorzy: Pogorzelski S.J. , Kogut A.D.
• Języki publikacji: EN

Abstrakty

EN

The paper contains the results of natural surface film surface pressure – area experiments carried out in inland waters and shallow offshore regions of the Baltic and Mediterranean Seas during 1990–99 under calm water conditions using the Langmuir trough – Wilhelmy filter paper plate system, which ‘cuts out’ an undisturbed film-covered sea area without any initial physico-chemical sample processing. The limiting specific area Alim (268–3157 ˚A2/molecule−1) and mean molecular mass (0.65–9.7 kDa) of microlayer surfactants were determined from the 2D virial equation of state applied to the isotherms. Film structure signatures were derived from π − A isotherm hysteresis and application of the 2D polymer scaling theory. The stress-relaxation measurements revealed a two-step relaxation process at the interface with characteristic times τ1 (1.1–2.8) and τ2 (5.6–25.6) seconds suggesting the presence of diffusion-controlled and structural organization relaxation phenomena. The results demonstrate that natural films are a complex mixture of biomolecules covering a wide range of solubilities, surface activity and molecular mass with an apparent structural organization exhibiting a spatial and temporal variability.

Słowa kluczowe

EN

natural water; Mediterranean Sea; dynamic property; water condition; surfactant; marine film; Baltic Sea; viscoelasticity; static property

• Wydawca: -
• Czasopismo: Oceanologia
• Rocznik: 2001
• Tom: 43
• Numer: 2
• Opis fizyczny: p.223-246,fig.,ref.

Twórcy

autor

Pogorzelski S.J.

• University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland

autor

Kogut A.D.

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