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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:23 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Polymer Physics
Title:
The hydrophobic and anti-reflective properties of hybrid films obtained by sol-gel process
Authors:
Violeta Purcar(1,2), I. Stamatin(1), Adriana Andronie(1), St. Iordache(1),D. Donescu(2), C. Petcu(2), M. Ghiurea(2), Otilia Cinteza(3), Teodora Miclaus(3)
Affiliation:
(1)University of Bucharest, Faculty of Physics, 3Nano-SAE Research Centre, P.O.Box MG-38, 077125 Bucharest-Magurele, Romania
(2)National Research&Development Institute for Chemistry and Petrochemistry ICECHIM, Splaiul Independentei no.202, 6th district, P.O. 35-174, 0600021, Bucharest, Romania
(3)University of Bucharest, Faculty of Chemistry, Bd. Regina Elisabeta 4-12, 1st district, Bucharest, Romania;
E-mail
office@3nanosae.org
Keywords:
sol-gel process, hydrophobic surface, anti-reflective coatings, hybrid films
Abstract:
Although the advances in nanotechnology have developed different inks, coatings and materials with superhydrophobic properties still is a big leap need to be performed to the nature mimicking. The experimental methods dealt with development of superhydrophobic surfaces mimicking the conical spikes with subsequent functionalizing or to find other materials with hydrophobic features (top-down methods): sol-gel, selective solvent etching, mechanical treatment, carbon nanotubes alignment, silylation/silanization, etc. Among the different techniques used to obtain thin films, the sol–gel method offers certain advantages such as simplicity and low cost, capability for coating large surface areas, low processing temperatures, homogeneous film on glass and high optical properties of the films.
The purpose of this study is to produce by sol-gel process novel coatings with hydrophobic and antireflective properties. Hybrid thin films were prepared by hydrolysis and condensation reactions of tetraethoxysilane (TEOS) in acidic conditions, as pure or synthesized with addition of different triethoxysilanes (RTES) that have variable organic (R) functionality: methyl (MTES), phenyl (PhTES), octyl (OTES) and vinyl (VTES). The final composites were transparent and homogenous, and were deposited on a glass slides. Hybrid films were characterized using various techniques including Fourier transform infrared (FT-IR), UV–vis spectrometry environmental scanning electron microscopy (ESEM), atomic force microscopy (AFM), and water contact angles of film surfaces.
The hybrid silica films prepared show promising properties as highly hydrophobic coatings for glass.
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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