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Effects of atmospheric plasma activation on surface properties of pigment-coated and surface-sized papers

“…In addition, plasma deposition can be used to create molecular monolayer coatings, which demand only very small amounts of raw materials. Plasma treatment is believed to influence only the very first atomic layers of a substrate without altering the bulk properties [4], but with a porous substrate such as uncoated paper it has been shown that plasma treatment may also permeate to inner layers [5].…”

“…In contrast, carbon tetrafluoride plasma gave a high surface fluoride content and a very hydrophobic surface was created. There are also several other studies in which low-pressure plasma with fluorocarbon or silicon compounds has rendered the paper highly hydrophobic [4,5,[10][11][12]. Denes et al also found that low-pressure cold plasma treatment increased the surface roughness of surfacesized security papers.…”

Reversible hydrophobization and lipophobization of cellulose fibers via trifluoroacetylation

“…The surface modification of cellulose fibers with fluorinated reagents therefore represents a promising strategy for the development of materials with novel properties. Only a handful of studies dealing with the chemical modification of cellulose with fluorine-containing compounds have been published thus far [6][7][8][9][10][11][12][13]. The trifluoroacetylation of cellulose in the homogeneous trifluoroacetic acid (TFA)/trifluoroacetic anhydride (TFAA) system was reported by Liebert et al [7], whereas Glasser and co-workers studied the homogeneous esterification of cellulose with trifluoroethoxy and difluoroethoxy acetic acid [8,9].…”

Deposition of teflon-like protective layers in surface discharge at atmospheric pressure

“…In order to deposit highly hydrophobic natural polymeric surfaces, for example, CF 4 [7] or fluortrimethylsilane [8] can be used. (Besides the low-pressure techniques, nowadays several attempts to deposit thin films at atmospheric pressure on several different cellulose based surfaces were done.).…”