Abstract
Superhydrophobic coatings have a huge impact in various applications due to their extreme water-repellent properties. The main novelty of the current research work lies in the development of cheap, stable, superhydrophobic and self-cleaning coatings with extreme water-repellency. In this work, a composite of hydrothermally synthesized alumina (Al2O3), polymethylhydrosiloxane (PMHS) and polystyrene (PS) was deposited on a glass surface by a dip-coating technique. The Al2O3 nanoparticles form a rough structure, and low-surface-energy PHMS enhances the water-repellent properties. The composite coating revealed a water contact angle (WCA) of 171 ± 2° and a sliding angle (SA) of 3°. In the chemical analysis, Al2p, Si2p, O1s, and C1s elements were detected in the XPS survey. The prepared coating showed a self-cleaning property through the rolling action of water drops. Such a type of coating could have various industrial applications in the future.
Highlights
Superhydrophobic surfaces have earned much attention from researchers in the last two decades due to their excellent water repellent behavior and the high mobility of water, which can be used to avoid accumulating dirt, fouling, fogging, and icing [1,2,3,4]
We only focused on the study of the effect of dip-coating cycles on the superhydrophobic coating
We further studied the effect of an AD-2-coated superhydrophobic substrate for the rest of the studies, because at four layers of coating, the fabricated substrate can exhibit the maximum contact angle, as well as a surface roughness which was reduced by the further increase of coating layers
Summary
Superhydrophobic surfaces have earned much attention from researchers in the last two decades due to their excellent water repellent behavior and the high mobility of water, which can be used to avoid accumulating dirt, fouling, fogging, and icing [1,2,3,4]. Sutha et al fabricated an optically transparent, anti-reflective, and self-cleaning superhydrophobic Al2O3 coating on a glass substrate [25]. In this process, the authors first prepared Al2O3 sol by mixing aluminium nitrate nonahydrate with 2-methoxyethanol solution by magnetic stirring in a monoethanolamine stabilizer at room temperature. Karapanagiotis et al dispersed different-sized hydrophilic alumina nanoparticles (25, 35, and 150 nm) in different concentrations in solutions of a hydrophobic poly(alkyl siloxane), and the prepared suspensions were sprayed onto a glass surface [26] They stated that the wettability of the composite film is independent of the size, but is affected by the concentration of the particles. The collected Al2O3 particles were stored in the bottle for further use
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