The process Sol Gelhad been discovered at the last part of 1800s and it had been studied at thestart years of 1930s. It is a method of preparation of oxides, whichuses two ways of syntheses.
They vary accordingto the nature of the precursor: it could use whether metal salts or organometalliccompounds, which uses metal alcoxydes in organic medium. Itis the most common method employed to perform the thin layers (1-2].
The process Sol Gelis of several interests: it makes it possible to obtain homogeneous and pure materials to the room temperature, inopposition to the conventional methods which ask for high temperatures of heattreatment. Moreover, the materials obtained by way Sol Gel present interestingproperties: hardness, transparency in the visible one, chemical durability,controlled porosity, thermal resistance [1]…
The way Sol Gel isnot only a method of synthesis but also a process of deposit inliquid phase.
The sol can bedeposited by dip-coating, spin-coating or spray-coating on various substratesto form a thin film which during the process of hydrolysis and condensation istransformed into a gel [3].
In this work a compositematerial based on phosphate-nickel-titanium has been synthesized by the sol gel technique at room temperatureand characterized; the influence of different experimental parameters duringthe preparation (temperature, time, hydrolysis rate, catalysts, pH ...) wasstudied in order to optimize these parameters. The coating on the zinc andcopper substrates for protection against corrosion was carried out by theDip-coating technique; the structural study of xerogel and deposits wasstudied, preliminary, by X-ray diffraction(XRD).
references
[1] C.J. Brinker and G.W. Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing. Academic Press, San Diego, 1990.
[2] Alain C. Pierre, Introduction to Sol-Gel Processing. Kluwer Academic Publishers, Boston, 1998.
[3] Bonino, Jean-Pierre and Xuereb, Elodie and Esteban, Julien and Ansart, Florence Les revêtements sol-gel pour l’anticorrosion. (2011) Matériaux & Techniques, vol. 99 (n° 1). pp. 41-50. ISSN 0032-6895
P - Materials science: polymers, thin films, nanopowders, ceramics, crystals, composites e
