Creating water-repellent and super-hydrophobic cellulose substrates by deposition of organic nanoparticles

Bio-Based Coatings for Paper Applications

“…An important factor in this analysis, is the multiple-scale modeling of roughness parameters of the (coated) paper surfaces [150]. As such, a multi-scale roughness profile can be created over the paper surface by means of polymer nanotechnology in combination with the fibrous surfaces, in order to create highly hydrophobic properties [151]. By combining roughness measurements at different scale length with a compositional analysis, a calibration model for tuning wettability of nanoscale coated paper surfaces can be constructed [152]: the evolution of the contact angle with degree of imidization of the nanoparticles and the nanoscale surface roughness determined by atomic force microscopy (AFM) is illustrated in Figure 7: an increase in the apparent water contact angle θ* on a nanostructured rough surface depends on the equilibrium contact angle θ on a virtually flat surface and the roughness parameter r, following the Wenzel model of cos θ* = r·cos θ.…”

“…By combining roughness measurements at different scale length with a compositional analysis, a calibration model for tuning wettability of nanoscale coated paper surfaces can be constructed [152]: the evolution of the contact angle with degree of imidization of the nanoparticles and the nanoscale surface roughness determined by atomic force microscopy (AFM) is illustrated in Figure 7: an increase in the apparent water contact angle θ* on a nanostructured rough surface depends on the equilibrium contact angle θ on a virtually flat surface and the roughness parameter r, following the Wenzel model of cos θ* = r·cos θ. Depending on the deposition technique, the present model has been constructed for coatings deposited by bar-coating, while dip-coating resulted in a further augmentation of the water contact angle and self-cleaning tissue surfaces [151]. More interestingly, these nanoparticle coatings can be used as a model-system where the bio-renewable content of the nanoparticle structures and coatings could be improved by substituting towards a maximum of 70 wt % of the polymer coating with various vegetable oils, i.e., SMI/oil, including palm-, soy-, sunflower-, rapeseed, caster or cornoil [153].…”

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

“…Likewise, the alkaline sizing agent alkenylsuccinic anhydride (ASA) has been shown to enhance oil uptake under water-wet conditions (Payne et al 2012). Recently there also has been interest in the deposition of hydrophobic nanoparticles to render a surface highly hydrophobic (Stanssens et al 2011).…”

Morphological and Chemical Effects of Plasma Treatment with Oxygen (O2) and Sulfur Hexafluoride (SF6) on Cellulose Surface

“…However, the use of cellulose in these areas often becomes restricted due to the hydrophilic characteristic of this material, resulting from the presence of free hydroxyl groups in its molecule 8,9 . Thus, the surface modification of cellulose to enable the reduction of their receptivity to water is essential for the development of products such as more resistant packaging 10,11 , self-cleaning fabrics 12,13 and waterproof clothing 14,15 . The hydrophobic property of a surface depends mainly on the combination of adequate surface roughness and low surface energy 16 .…”