Biomedizinische Grenzflächen at ETHZ - ETH Zurich

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Exemplary flashcards for Biomedizinische Grenzflächen at the ETHZ - ETH Zurich on StudySmarter:

Ordering of water at interfaces gives rise to a variety of phenomena, most importantly, to the hydrophobic interaction.

Exemplary flashcards for Biomedizinische Grenzflächen at the ETHZ - ETH Zurich on StudySmarter:

Why is it bad to treat water as a continuous medium?

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Name the two consequences

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Exemplary flashcards for Biomedizinische Grenzflächen at the ETHZ - ETH Zurich on StudySmarter:

Hydrogen bonding is an important non-covalent interaction. It is relatively strong, directional, and omnipresent in biological systems.

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Was ist Teil der Foreign Body Reaction

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NaCl Charge-Charge interactions are much stronger in water than in vacuum

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What does water in hydration shell tend to do? 

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Exemplary flashcards for Biomedizinische Grenzflächen at the ETHZ - ETH Zurich on StudySmarter:

Describe the understanding from bottom-up. 

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Name the two interactions between small molecules

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H-bonds substantially contribute to the dielectric constant and the high boiling point of water

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What are the criteria for hydrophilicity?

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Exemplary flashcards for Biomedizinische Grenzflächen at the ETHZ - ETH Zurich on StudySmarter:

Biomedizinische Grenzflächen

Ordering of water at interfaces gives rise to a variety of phenomena, most importantly, to the hydrophobic interaction.

True

Biomedizinische Grenzflächen

Why is it bad to treat water as a continuous medium?

it neglects entropic effects!


Often it is better to think about interactions on the molecular level.

Biomedizinische Grenzflächen

Name the two consequences

1) Interfacial tension

2) Hydrophobic effect

Biomedizinische Grenzflächen

Hydrogen bonding is an important non-covalent interaction. It is relatively strong, directional, and omnipresent in biological systems.

True

Biomedizinische Grenzflächen

Was ist Teil der Foreign Body Reaction

Beteiligung des Immunsystems

Biomedizinische Grenzflächen

NaCl Charge-Charge interactions are much stronger in water than in vacuum

False

Biomedizinische Grenzflächen

What does water in hydration shell tend to do? 

  • water in hydration shell tends to be oriented
    • -> ion hydration thus decreases the entropy of the solvent


  • orientation of solvent molecules due to the strong orientation dependence of their ion-(free rotating) dipole interaction


  • number of bound water molecules given by hydration number

Biomedizinische Grenzflächen

Describe the understanding from bottom-up. 

§ The principle interactions between biological materials
(including cells) happen on the molecular level
§ Biological (macro)molecules are complicated structures
§ They cannot be described exactly by simple properties
§ To understand them, we need to know the behavior of their elemental building blocks


§ Importantly, everything happens in/with water (solvent)

Biomedizinische Grenzflächen

Name the two interactions between small molecules

1) long-ranged, electrostatic

2) van der waals

Biomedizinische Grenzflächen

H-bonds substantially contribute to the dielectric constant and the high boiling point of water

True

Biomedizinische Grenzflächen

What are the criteria for hydrophilicity?

offering of interaction possibilities with water molecules:


  • H-bond accepting or donating groups
    • O in carbonyl groups C=O; carboxylates (COO-); sulfonates (SO3-)
    • H in amine -NH2 groups or in hydroxyl -OH groups
  • charged/zwitterionic surfaces
    • charge-dipole, (fixed dipole)-dipole
    • polyelectrolytes / polysaccharides
    • soluble proteins
    • nucleic acids (DNA, RNA)

Biomedizinische Grenzflächen

Beurteile

hydrogen bonds can occur intermolecularly and intramolecularly



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