Electrokinetic Properties of Cellulose Diacetate—Influence of Morphology and Crystallinity on the Zeta Potential

Abstract The study presents the electrokinetic properties of the zeta potential and the isoelectric point for cellulose diacetate (CA) in the forms of powder, nonporous film, and porous film. Surface zeta potential ( ζ ) and isoelectric point (IEP) are important properties that reflect the material's behavior in contact with liquids, as a consequence of the surface charge density and the morphology of the material. Nonporous films are prepared by casting CA solution on glass and Teflon dishes, while the porous film is prepared by the solution blow spinning (SBS) technique. The ζ potential is determined using the streaming potential method in the pH range from 2.5 to 9.5. The influence of the material's crystallinity (CI) and surface roughness ( S a ) on the zeta potential is studied. The form of the material (powder, porous film, or nonporous film) influences the electrokinetic properties, which may have consequences on their behavior in contact with liquid (e.g., for processes such as oxidation, surface modification, grafting, or aging during use).