= Solution
\b[There is no universal ranking from the information supplied.] The <depletion force> scales with <polymer> <osmotic pressure>, hence with $\rho$ in the ideal model. <London dispersion forces> instead depend on the material-dependent <Hamaker constant>, the intervening solvent, the closest approach and the contact geometry.
Close face contact can give a strong dispersion contribution; the ideal continuum expression even becomes singular without a molecular-distance cutoff. Nevertheless, refractive-index matching can greatly reduce that contribution, and increasing <polymer> concentration can strengthen <depletion force>. A quantitative comparison requires those missing material and concentration scales. The two attractive contributions may act together.
Back to article page
