Steric stabilization of colloids is usually achieved by adsorption or surface grafting of polymer chains

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Steric stabilization of colloids is usually achieved by adsorption
or surface grafting of polymer chains. Neutral polymers
adsorbed or grafted to a surface expand away to gain configurational
entropy. When a chain emanating from a surface
encounters a chain from another surface, its allowed conformations
are reduced and its tendency to increase its configurational
entropy provides resistance to further compression. So-called
steric or entropic repulsion between surfaces are thus generated
as the grafted polymer layers overlap. Generally, the repulsion
force appears once a surface-surface separation distance of the
order of twice the radius of gyration of the chains, Rg, is reached.
The dimensions of the polymer coil therefore determine the
range of the entropic force.

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