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Magnet-induced temporary superhydrophobic coatings from one-pot synthesized hydrophobic magnetic nanoparticles.
journal contributionposted on 2010-05-26, 00:00 authored by Jian Fang, Hong WangHong Wang, Y Xue, Xungai WangXungai Wang, Tong Lin
In this paper, we report on the production of superhydrophobic coatings on various substrates (e.g., glass slide, silicon wafer, aluminum foil, plastic film, nanofiber mat, textile fabrics) using hydrophobic magnetic nanoparticles and a magnet-assembly technique. Fe3O4 magnetic nanoparticles functionalized with a thin layer of fluoroalkyl silica on the surface were synthesized by one-step coprecipitation of Fe2+/Fe3+ under an alkaline condition in the presence of a fluorinated alkyl silane. Under a magnetic field, the magnetic nanoparticles can be easily deposited on any solid substrate to form a thin superhydrophobic coating with water contact angle as high as 172°, and the surface superhydrophobicity showed very little dependence on the substrate type. The particulate coating showed reasonable durability because of strong aggregation effect of nanoparticles, but the coating layer can be removed (e.g., by ultrasonication) to restore the original surface feature of the substrates. By comparison, the thin particle layer deposited under no magnetic field showed much lower hydrophobicity. The main reason for magnet-induced superhydrophobic surfaces is theformation of nano- and microstructured surface features. Such a magnet-induced temporary superhydrophobic coating may have wide applications in electronic, biomedical, and defense-related areas.
JournalACS applied materials & interfaces
Pagination1449 - 1455
PublisherAmerican Chemical Society
NotesPublication Date (Web): April 16, 2010
Publication classificationC1 Refereed article in a scholarly journal
Copyright notice2010, American Chemical Society
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superhydrophobicmagnetic nanoparticlesone-pot synthesistemporary coatingmagnet-induced superhydrophobicityfibre scienceScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials ScienceFTIR ANALYSISFILMSDEPOSITIONSURFACESWATERCONVERSIONBEHAVIORDRUG