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Sunday, 15 September 2019
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Raw materials & technologies, Technologies

Synthesis of chitosan capped CuO nanoleaves and their application in antifouling coatings

Friday, 29 July 2016

Indian researchers synthesised chitosan capped cupper oxide nanoleaves by high intensity ultrasound. To investigate the antifouling effiency, they blended the nanoleaves with commercial polyurethane paints.

Synthesis of chitosan capped CuO nanoleaves and their application in antifouling coatings. Source: Uwe-Jens Kahl/pixelio.de

Synthesis of chitosan capped CuO nanoleaves and their application in antifouling coatings. Source: Uwe-Jens Kahl/pixelio.de

The synthesis of chitosan capped copper oxide nanoleaves (CCCO NLs) was carried out under three different reaction conditions:

  1. room temperature
  2. 70 °C and
  3. high intensity ultrasound (30 kHz) sonication method

High intensity ultrasound sonication is the best method

It has been found that the high intensity ultrasound (30 kHz) sonication is the best method when compared to other two methods. The advantages of the present synthetic method are: i) easy one step process, ii) lesser reaction time, iii) good yield, iv) reproducible and v) calcination is not required. The resulting chitosan capped copper oxide nanoleaves were characterised by Diffuse Reflectance UV-Visible Spectroscopy (DRS), Fourier Transform Infra-Red Spectroscopy (FT-IR), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Field Emission Scanning Electron Microscopy (FESEM), High Resolution Transmission Electron Microscopy (HRTEM) and Thermo gravimetric analysis (TGA).

Coating exhibits good anti fouling behaviour

The CCCO NLs were blended with commercial paints such as polyurethane clear, polyurethane white and acrylic emulsion and applied on to three different surfaces (wood, mild steel and cement slab panels). The hydrophilicity of CCCONP coated panels was analysed by water contact angle measurement and their antifouling behaviour was investigated against three different green and marine algae viz. Arthrospira, Chlorella and Amphora. The antifouling efficiency of the CCCO NLs against the algae was found to be 78–92%.

The study is published in: Ultrasonics Sonochemistry, Volume 34, January 2017, Pages 781–791

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