Investigation of sea-surface microlayer and phytoplankton culture samples by monolayer techniques and Brewster angle microscopy

Kozarac, Zlatica; Moebius, Dietmar; Spohn, Daniela B. (1998) Investigation of sea-surface microlayer and phytoplankton culture samples by monolayer techniques and Brewster angle microscopy. Croatica Chemica Acta, 71 (2). pp. 258-301. ISSN 0011-1643

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Abstract

Natural samples of sea-surface microlayer and phytoplankton culture samples have been studied by monolayer techniques and by Brewster angle microscopy (BAM). Surface pressure-area (pi-A) and surface potential-area (Delta V-A) isotherms have been measured. Simultaneously BAM video images have been recorded. The pi-A isotherms, as well as BAM images of monolayers of dipalmitoyl phosphatidylcholine (DPPC), dimyristoylphosphatidic acid (DMPA) and dioctadecyldimethyl ammonium bromide (DOMA) spread on an aqueous subphase containing a sample of phytoplankton culture show that surface active substances released by phytoplankton influence molecular organization as well as domain morphology of the lipid monolayers. The sea-surface microlayer sample spread at the air/water interface exhibits the characteristics of a liquid expanded phase without undergoing a phase transition. The BAM images taken from this film depend on surface pressure, showing at low surface pressures liquid condensed domains surrounded by a liquid expanded phase, and at higher surface densities only a liquid condensed phase.

Item Type:

Article

Uncontrolled Keywords:

air-water-interface; dioctadecyldimethylammonium bromide; molecular-organization; marine-phytoplankton; insoluble monolayers; direct visualization; chemical-properties; complex monolayers; active substances; phase-transitions

Subjects:

NATURAL SCIENCES > Chemistry

Divisions:

Division for Marine and Enviromental Research

Projects: