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

marine films; isotherms; virial equation; adsorption kinetics; relaxation processes; viscoelasticity

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2001
• Tom: No. 43 (2)
• Strony: 223--246
• Opis fizyczny: Bibliogr. 32 poz., tab., wykr.

Twórcy

autor

Pogorzelski S.J.

autor

Kogut A. D.

• Institute of Experimental Physics, University of Gdańsk, Wita Stwosza 57, PL-80-952 Gdańsk, Poland,