Marine Interfaces at Universität Oldenburg | Flashcards & Summaries

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Lernmaterialien für Marine Interfaces an der Universität Oldenburg

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Gas solubility ...

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is independent of temperature and salinity


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With the diffusion of a dissolved substance in sediment pore waters, and the dissolved substance chemically react as a educt, then a

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negative deviation of a linear steady state flux is observed


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What is adsorption?

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accumulation of substances at the interface between two bulk phases

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How is surface excess defined?

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The difference of the total concentrations of a substance in a system considering the real interface and the modelled interface


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What is the Gibbs convention?

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Placing the dividing surface at a position that the surface excess of the major component becomes zero


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What is the most prominent feature of surfactants?

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have hydrophobic and a hydrophilic groups

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When do surfactant form micelles?

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If no space is left for surfactant molecules to adsorb at the gas-liquid interface


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Micelles are ...

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Micelles are well structured aggregates of surfactants with hydrophic tail oriented inwards and hydrophilic group positioned at the micelles out surface.

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Foam is typically instable because...

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water drains away from the bilayer and elektrostatical repulsion of surfactants with the thinning of the aqueous layer between surfactant films


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Foam forms...

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after wave breaking (short-lived)


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Aerosols with potentially surface-active compounds as main component are primarily formed

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in the presence of biological activity


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What are examples of adsorption in the marine environment?

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Adsorption of surfactants at the air-water interface


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Q:

Gas solubility ...

A:

is independent of temperature and salinity


Q:

With the diffusion of a dissolved substance in sediment pore waters, and the dissolved substance chemically react as a educt, then a

A:

negative deviation of a linear steady state flux is observed


Q:

What is adsorption?

A:

accumulation of substances at the interface between two bulk phases

Q:

How is surface excess defined?

A:

The difference of the total concentrations of a substance in a system considering the real interface and the modelled interface


Q:

What is the Gibbs convention?

A:

Placing the dividing surface at a position that the surface excess of the major component becomes zero


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Q:

What is the most prominent feature of surfactants?

A:

have hydrophobic and a hydrophilic groups

Q:

When do surfactant form micelles?

A:

If no space is left for surfactant molecules to adsorb at the gas-liquid interface


Q:

Micelles are ...

A:

Micelles are well structured aggregates of surfactants with hydrophic tail oriented inwards and hydrophilic group positioned at the micelles out surface.

Q:

Foam is typically instable because...

A:

water drains away from the bilayer and elektrostatical repulsion of surfactants with the thinning of the aqueous layer between surfactant films


Q:

Foam forms...

A:

after wave breaking (short-lived)


Q:

Aerosols with potentially surface-active compounds as main component are primarily formed

A:

in the presence of biological activity


Q:

What are examples of adsorption in the marine environment?

A:

Adsorption of surfactants at the air-water interface


Marine Interfaces

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