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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:08 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Physics and Technology of Alternative Renewable Energy Supplies
Title:
Synthesis of sol-gel-fluorinated silica nanoparticles and
their super-hydrophobic thin films
Authors:
Violeta PURCAR (1,2), I. STAMATIN(1), Otilia CINTEZA(3), Dan DONESCU(2), C. PETCU(2), Ioana Catalina VACARASTEANU(3), Simona CAPRARESCU(4)
Affiliation:
1University of Bucharest, Faculty of Physics, 3Nano-SAE Research Centre, P.O.Box MG-38, 077125 Bucharest-Magurele, Romania
2National Research&Development Institute for Chemistry and Petrochemistry ICECHIM, Splaiul Independentei no.202, 6th district, P.O. 35-174, 060021, Bucharest, Romania
3University of Bucharest, Faculty of Chemistry, Bd. Regina Elisabeta 4-12, 1st district, Bucharest, Romania;
4University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science,1-7 Polizu St., 011061, Bucharest, Romania
E-mail
violetapurcar@yahoo.com
Keywords:
superhydrophobic materials, thin films, sol-gel
Abstract:
Because of its water-repellent property, super-hydrophobic surfaces have several applications in the fields such as self-cleaning-fabrics, anticorrosive industrials parts and even surface drag reduction to reduce energy consumption of transport systems. Sol-gel techniques together with spray coatings or commercial paintbrush coatings might be one approach to overcome such draw back.By scientific and applicative reasons, in this study different hybrid systems produced by sol-gel process, based on silica precursors (tetraethoxysilane (TEOS), octyltriethoxysilane (OTES), perfluorooctyltriethoxysilane (PFOTES) were investigated. Novel coatings with super-hydrophobic and antireflective properties were obtained: (1) TEOS/OTES (acidic conditions), (2) TEOS/PFOTES (basic conditions; fluorinated silica nanoparticles dispersed in ethanolic or propanolic solutions), and (3) TEOS/OTES+TEOS/PFTEOS, respectively. The final hybrid silica films were deposited onto clean glass slides, using a small brush and dried at room temperature (25°C). These hybrid silica films were characterized using various techniques including Fourier transform infrared (FT-IR) (to evaluate the atomic bonding in the films), UV–Vis spectrometry (to determinate the reflectance of coated samples). The wetting properties of the prepared and functionalized hybrid films were performed using the contact angle measurements. The thin silica films prepared using the fluorinated silica nanoparticles provide super-hydrophobic properties with a water contact angle value ≥150°. With proper experimental conditions super-hydrophobic hybrid silica films can be obtained for industrial applications of the sol-gel-derived fluorinated silica nanoparticles.
Note: This work was supported by the strategic grant POSDRU/89/1.5/S/58852, Project „Postdoctoral programme for training scientific researchers“ cofinanced by the European Social Found within the Sectorial Operational Program Human Resources Development 2007-2013“.
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