DLVO and polymer-induced interactions

8 important questions on DLVO and polymer-induced interactions

What is more used in colloid chemistry; Force or Potential Energy?

They contain the same information; but have a different dimension and meaning.

For colloid stability, potential energy is typically used, because it can be compared to kBT.

How to measure colloidal forces?

• Surface Force Apparatus • Atomic Force Microscopy • Optical Tweezers

What is the main factor the potential distrubtion Ψ(x) depends upon?

Plate distance (L)
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What does Derjaguin Landau Verwey Overbeek (DLVO) propose?

Superposition of Van der Waals attraction and Electric Double Layer repulsion.

From infinite plates to real colloids Many colloids are closer to spherical objects. DLVO concepts and trends still apply:

DLVO concepts and trends still apply: § vdWaals forces for spheres calculated relatively simply. § PB solution for EDL around a sphere exists. § Overlap of EDLs changes the symmetry, requiring numeric calculation or (integration) approximation.

Why are divalent salts (e.g. CaX) generally less soluble than monovalent ones (NaY)?

Don't know yet.

Polymers don’t like to be inside the shells surrounding the particles … why?

Adsorbing polymers lose entropy ‘depletion zone’ around particles Free enthalpy (ΔG) cost: πosmΣVexcluded

What is the Bjerrum length?

Distance at which 2 unit charges (with only dielectric medium in between) have interaction energy of 1 kBT. In water, Bjerrum length is about 0.7 nm

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