Surface chemical characterization of nanoparticle coated paperboard

摘要

The chemical composition of nanoparticle coated paperboard surfaces was characterized. The deposition of SiCh and TiO_2 nanoparticles induced changes in wetting properties of the paperboard surface: a superhydrophilic surface was created by SiCh nanoparticles and a superhydrophobic surface by TiO_2 nanoparticles. Both X-ray photoelectron spectroscopy (XPS) and contact angle (CA) measurements were used to study the surface properties of the samples. The low and high resolution XPS spectra were collected to evaluate the chemical composition before and after nanoparticle deposition. The SiO_2 nanocoated sample has the highest values of both 0 to C and C2 to C1 ratios, which indicates a high relative amount of hydroxyl groups. On the other hand, carbon Cl peak which represents the hydrocarbon type of bonds, is on higher level for TiO_2 when compared to the SiO_2nanocoated sample. This may be related to the replacement of hydroxyl groups by aliphatic chains on the superhydrophobic surface of TiO_2 nanoparticle coated sample.