How to Avoid Filtering Additives Out of Lubricants

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I guess I am a bit confused about the filtering "out" of the usual anti-foam (AF) additive molecule, Polydimethylsiloxane (unless we're talking about a different AF molecule).

According to Mavric, A. et al., Molecular size and solubility conditions of polysilane macromolecules with different topology. Sci. Rep. 6, 35450; doi: 10.1038/srep35450 (2016), and using transmission electron microscope (TEM) methods, they found the average size of the molecule to be about 20nm or 0.02 micrometers.

Has it been found that there is some type of "Coulombic attraction" or "surface tension" mechanism to the filtering media, as these mechanisms would seem to be the only other mechanisms for trapping this molecule?

The latter mechanism would seem to be a weak explanation since the whole purpose of the PDMS molecule is to reduce the surface tension of air bubbles in lubricants.
 
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