Improved surface properties in spray-coated PU/TiO2/graphene hybrid nanocomposites through nonsolvent-induced phase separation

Herein, superhydrophobic and antibacterial polyurethane (PU) nanocomposite films loaded with titanium dioxide (TiO2) nanoparticles and graphene nanoplatelets were fabricated via a spray coating technique. The nonsolvent-induced phase separation (NIPS) process increased the films' roughness and...

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Bibliographic Details
Published in:Surface & coatings technology 2021-01, Vol.405, p.126507, Article 126507
Main Authors: Mirzadeh, Salman, Asefnejad, Azadeh, Khonakdar, Hossein Ali, Jafari, Seyed Hassan
Format: Article
Language:English
Subjects:
Antibacterial
Atomic force microscopy
Biocides
Coating
Contact angle
E coli
Graphene
Hydrophobic surfaces
Hydrophobicity
Microscopy
Nanocomposite
Nanocomposites
Nanoparticles
Optical microscopy
Phase separation
Polyurethane
Polyurethane resins
Spray coating
Structural hierarchy
Superhydrophobic
Surface properties
Surface roughness
Titanium dioxide
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Summary:Herein, superhydrophobic and antibacterial polyurethane (PU) nanocomposite films loaded with titanium dioxide (TiO2) nanoparticles and graphene nanoplatelets were fabricated via a spray coating technique. The nonsolvent-induced phase separation (NIPS) process increased the films' roughness and hydrophobicity. In addition to the effective role of nonsolvent in phase separation, graphene also played the nucleating role and promoted the NIPS process. Based on scanning electron microscopy, atomic force microscopy, and optical microscopy results, it was found that the combinational use of TiO2, graphene, and nonsolvent leads to a hierarchical structure with a high extent of uniform surface roughness resulting in a superhydrophobic/roll-off behavior (water contact angle = 159°, sliding angle 
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2020.126507