NDLI: Water-repellent coatings prepared by modification of ZnO nanoparticles.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chakradhar, R. P. S. Dinesh Kumar, V.
Description	Country affiliation: India Author Affiliation: Chakradhar RP ( Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India. chakra@nal.res.in)
Abstract	Superhydrophobic coatings with a static water contact angle (WCA)>150° were prepared by modifying ZnO nanoparticles with stearic acid (ZnO@SA). ZnO nanoparticles of size â ¼14nm were prepared by solution combustion method. X-ray diffraction (XRD) studies reveal that as prepared ZnO has hexagonal wurtzite structure whereas the modified coatings convert to zinc stearate. Field emission scanning electron micrographs (FE-SEM) show the dual morphology of the coatings exhibiting both particles and flakes. The flakes are highly fluffy in nature with voids and nanopores. Fourier transformed infrared (FTIR) spectrum shows the stearate ion co-ordinates with Zn(2+) in the bidentate form. The surface properties such as surface free energy (Î³(p)) and work of adhesion (W) of the unmodified and modified ZnO coatings have been evaluated. The electron paramagnetic resonance (EPR) spectroscopy reveals that surface defects play a major role in the wetting behavior.
ISSN	13861425
Volume Number	94
e-ISSN	18733557
Journal	Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Language	English
Publisher	Elsevier
Publisher Date	2012-08-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrophobic And Hydrophilic Interactions Nanoparticles Chemistry Water Zinc Oxide Electron Spin Resonance Spectroscopy Ultrastructure Powders Spectroscopy, Fourier Transform Infrared Stearic Acids X-ray Diffraction Journal Article Research Support, Non-u.s. Gov't Discipline Spectroscopy
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation

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