Surface characteristics and wetting properties of sol–gel coated base paper

Abstract

a Two hybrid coatings synthesized by using alkoxysilanes as precursors in a sol-gel process, differing from each other in terms of the organic components in alkoxysilanes, have been developed to improve the water repellent properties of base paper. The sol-gel-coated base paper samples were characterized by scanning electron microscopy, atomic force microscopy, confocal laser scanning microscopy, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry, and contact angle measurements. The sol-gel coatings were found to clearly change the surface properties of base paper. Thin coating layers were formed on base paper surfaces. The topographical data indicated the formation of discontinuous thin films; the time-of-flight secondary ion mass spectrometry analyses confirmed that the coatings were covering the fibres but only partially covered the fibre-fibre intersections. Water and the subsequent heat treatment used as a reference treatment reduced the surface roughness and porosity and slightly changed the surface chemistry of the base paper. The wettability and absorptivity of base paper was clearly reduced by the applied coatings.

Novel Recycled Brown Paper Coatings

“…The absorptivity of base paper was clearly reduced by the applied coatings and this coincides with the observation of Wang et al (23) .…”

“…It was reported that many properties of coated paper can be improved by optimizing coating pore structure (4) .Recently, it was concluded (5) that the pore volume in the top-coating determines the spreading of the micrometer silver ink and coat air permeability is based exponentially on surface porosity. Furthermore, the porosity distribution and surface roughness can mainly influence paper-printing ink interactions ( 4) .…”

“…Furthermore, the porosity distribution and surface roughness can mainly influence paper-printing ink interactions ( 4) .…”

Molecular dynamics simulation of surface morphology and thermodynamic properties of polyaniline nanostructured film

“…These values are compared very well with FFV % data obtained from the Bondi and van Krevlen method. It should be noted that the estimated values of FFV % are sensitive to the density of polymers . Thus, the reported FFV % values are higher for the PANI generated at temperature of 418 K as its density is lower (≈1.20 g cm −3 ) compared with the PANI obtained at 298 K (1.333 g cm −3 ).…”

“…The FFV is used to characterize the efficiency of chain packing and free space in a polymer matrix . Theoretically, the FFV was determined from Bondi and van Krevlen method based on the equation E.3 given in the Supporting information (Appendix E) . The FFV % calculated values of the PANI at temperatures of 298, 348, and 418 K are 40.3 ± 0.4%, 50.5 ± 0.6%, and 59.6 ± 0.6%, respectively.…”