17 November 2006
The properties of glass material allow a wide field of applications, from the high scale diffusion materials (windows, bottles …) to very high-cost ones (jewels, optical filters …). For most of theses applications, surface treatments increase the performances and enlarge the functions of base glass: low-emissivity, marking, self-cleaning or electrochromic functions for windows, functional or decorative applications in luxury and optics industries (interferential optical filters).
The aim of this day is to state non-exhaustively the art about different treatments for glass functionalising by thin coatings, including developments performed at laboratory scale in academic or private research centres, as well as already industrialised ones.
The didactic talks will be presented by academic researchers or by industrial speakers and will be the base of a discussion about “glass, a functional material of the future”.
Expert : Pr Billard - UTBM - Laboratory of study and research on material, the processes and surfaces.
From antics glasses to nanoparticles
This talk proposes an historical overview about flat glass manufacturing. It will highlight the main technical evolutions and their consequences on both its use and properties.
In this presentation, after a short description of the related issues of biomolecules functionalising, we will present an original application of their use: glass marking against infringement.
Self cleaning glasses
The self-cleaning properties of the so-called glass is based on the coupling of two properties of TiO2 thin layers deposited on glass: the photocatalysis and the superhydrophilicity.
Photocatalysis is closely related to anatase-structure titanium dioxide. Its manufacturing as thin films, even if less efficient than powders which present a higher active surface, nevertheless allows applications where powders should not be used, as an example for windows.
Nowadays, self-cleaning glasses becomes a reality, this session will show the potential of the self cleaning glasses.
Glass colouration by coating.
The use of thin films of thickness in the range of the wavelength yields on glasses interferential phenomena leading to a colouration. These interferential effects must be distinguished from the intrinsic colouration obtained by absorption, due to their dependence to the film thickness and to the observation angle.
In this talk, after a short description of the process used to synthesise bulk coloured coatings, we will present some examples of materials the absorption properties of which can be used to colour glass.
X-Chromics coatings
Thermochromic materials undergo a reversible modification of their optical properties (transmittance, aspect, colour …) during a temperature variation. Among the different inorganic materials showing this property, vanadium dioxide (VO2) was the most studied due to the rather low temperature of its thermochromic transition (68°C).
We will resume here the scientific processes which allowed the determination of an appropriate ceramic electrolyte, the development of a specific deposition method for its synthesis and the structural, optical and electrical tests performed alone or in the presence of the whole stack to valid the proposed concept.
Logo_pôle_verrier_EEIGm_CERFAV_école_d'architecture