Abstract
Artificial superhydrophobic films were deposited onto a glass slide by performing layer-by-layer deposition of 3.5 bilayers of poly(allylamine hydrochloride)/ poly(acrylic acid) polyelectrolyte, followed by a layer of SiO2 nanoparticles of various amounts to enhance the surface roughness and a fluorosilane to reduce the surface free energy. Higher SiO2 content incorporated into the films resulted in rougher surface and higher water contact angle. The total surface free energy determined by using the Owens-Wendt equation dramatically decreased from 31.46 mJ·m-2 for the film having the relatively flat surface to only 1.16 mJ·m-2 for the film having the highest surface roughness of 60.2 ± 1.1 nm. All the films were optically transparent and had excellent adhesion based on the peel test. Indoor and accelerated weathering tests revealed good weathering stability.DOI: http://dx.doi.org/10.5755/j01.ms.22.2.12952
Highlights
Solid surface can interact with its surrounding that comes into contact with it in many ways
The superhydrophobic SiO2-polyelectrolyte multilayer films were coated onto a glass substrate by layer-by-layer deposition of the positively charged poly(allylamine hydrochloride) (PAH) and the negatively charged poly(acrylic acid) (PAA) polyelectrolytes to obtain 3(PAH/PAA) bilayers and another layer of the PAH, followed by a layer of SiO2 nanoparticles and fluorosilane, respectively
A superhydrophobic film was deposited on a 2.5 cm x 5 cm glass slide, which was cleaned in a sonication bath with ethyl alcohol, followed by acetone and distilled water, respectively
Summary
Solid surface can interact with its surrounding that comes into contact with it in many ways. Owens and Wendt proposed the method of measuring polar and dispersive components of the surface-free energy from the contact angles measured by using polar and non-polar liquids [11]. The superhydrophobic SiO2-polyelectrolyte multilayer films were coated onto a glass substrate by layer-by-layer deposition of the positively charged poly(allylamine hydrochloride) (PAH) and the negatively charged poly(acrylic acid) (PAA) polyelectrolytes to obtain 3(PAH/PAA) bilayers and another layer of the PAH, followed by a layer of SiO2 nanoparticles and fluorosilane, respectively. The negatively charged PAA layer was deposited by immerging the PAH-coated specimen into a PAA solution (concentration = 0.01 M) for at least 3 minutes, withdrawing at the rate of 0.1 mm s-1 and rinsing with distilled water. The film’s structure is schematically depicted in the Fig. 1
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