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Superhydrophobic ZnAl double hydroxide nanostructures and ZnO films on Al and glass substrates

De Debasis et Sarkar Dilip K.. (2017). Superhydrophobic ZnAl double hydroxide nanostructures and ZnO films on Al and glass substrates. Materials Chemistry and Physics, 185, p. 195-201.

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URL officielle: https://dx.doi.org/doi:10.1016/j.matchemphys.2016....

Résumé

Superhydrophobic nanostructured ZnAl: layered double hydroxides (LDHs) and ZnO films have been fabricated on Al and glass substrates, respectively, by a simple and cost effective chemical bath deposition technique. Randomly oriented hexagonal patterned of ZnAl: LDHs thin nanoplates are clearly observed on Al-substrate in the scanning electron microscopic images. The average size of these hexagonal plates is ∼4 μm side and ∼30 nm of thickness. While on the glass substrate, a oriented hexagonal patterned ZnO nanorods (height ∼5 μm and 1 μm diameter) are observed and each rod is further decorated throughout the top few nanometers with several nanosteps. At the top of the nanorod, a perfectly hexagonal patterned ZnO surface with ∼250 nm sides is observed. The tendency to form hexagonal morphological features is due to the hexagonal crystal structure of ZnO confirmed from X-ray diffraction patterns and transmission electron microscopy image. The ZnAl: LDHs and/or ZnO coated substrates have been passivated by using stearic acid (SA) molecules. Infrared spectra of passivated ZnAl: LDHs coated substrates confirm the presence of SA. X-ray diffraction pattern also corroborates the results of infrared spectrum. The contact angle of the as prepared samples is zero. The superhydrophobicity is achieved by observing contact angle of ∼161° with a hysteresis of ∼4° for Al-substrate. On the glass substrate, a higher contact angle of ∼168° with a lower hysteresis of ∼3° is observed. A lower surface roughness of ∼4.93 μm is measured on ZnAl: LDHs surface layer on the Al substrate as compare to a higher surface roughness of 6.87 μm measured on ZnO layer on glass substrate. The superhydrophobicity of passivated nanostructured films on two different substrates is observed due to high surface roughness and low surface energy.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:185
Pages:p. 195-201
Version évaluée par les pairs:Oui
Date:Janvier 2017
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Nanostructures oxides, chemical synthesis, electron microscopy, microstructure, surface properties, oxydes de nanostructures, synthèse chimique, microscopie électronique, microstructure, propriétés de surface
Déposé le:09 août 2021 14:27
Dernière modification:09 août 2021 14:27
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