Since both surfaces are negatively charged, I'm planning on adding a positively charged layer using either APTES ((3-Aminopropyl)triethoxysilane) or PAH (poly(allylamine hydrochloride)). Any recommendations?
Maybe, You can find some ideas having a look at the following paper describing silica nanoparticles that were functionalized with amino and epoxy groups and deposited on cotton samples were treated with epichlorohydrin to functionalize
the surface with highly reactive epoxy groups:
Thushara J. Athauda • Ruya R. Ozer, Investigation of the effect of dual-size coatings on the hydrophobicity of cotton surface, Cellulose (2012) 19:1031–1040.
DOI 10.1007/s10570-012-9659-7
maybe you can modify the cellulose acetate fibres by adsorbing cationic surfactants.
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