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1
Content available remote The influence of corrosion process on spectral properties of glassy coatings
Siwulski S., Nocuń M.
Optica Applicata
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2008
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Vol. 38, nr 1
217-223
EN
Glassy enamels are characterized by high chemical durability. Their chemical resistance properties, however, differ from those observed for conventional oxide glasses. This is because of their specific chemical composition and microstructure determined by enamel technology. In longer periods of exploitation in corroding conditions glassy coatings deteriorate continuously, the most significant changes taking place in the near-surface region. The main goal of this work was to establish the influence of chemical corrosion on spectral properties of glassy coatings. Changes in microstructure, gloss and reflectance were studied using electron microscopy and reflectance spectroscopy. It was confirmed that enamels based on pigments have higher durability than enamels coloured by ion dyes.
2
Content available remote Sodium diffusion barrier coatings prepared by sol-gel method
Nocuń M., Burco D., Siwulski S.
Optica Applicata
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2008
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Vol. 38, nr 1
171-179
EN
In the case of electrically conducting layers prepared on a glass substrate, sodium diffuses into the SnO2 film and deteriorates their electric properties. Sodium barrier diffusion properties of thin layers based on SiO2, and SiO2 modified by various contents of Al2O3, TiO2, ZrO2, CeO2, prepared by sol-gel, have been the subject of this study. Morphology and optical properties of the coatings have been analyzed. XPS technique has been used to evaluate the barrier properties of prepared coatings by measuring sodium 1s peak changes after thermal treatment of the coating. The best properties have been obtained for the coating based on SiO2-Al2O3 system and containing 0.08 mol of Al. It has been found that blocking properties of the coating are mainly connected with its microstructure. The role of added modifiers lies in changing the microstructure of formed gel.
3
Content available remote Thermal decomposition of silica-methyltrimethoxysilane hybrid glasses studied by mass spectrometry
Nocuń M., Gajerski R., Siwulski S.
Optica Applicata
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2005
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Vol. 35, nr 4
901-906
EN
Organically modified silicates (hybrid glasses) have attracted much attention in recent years because they are considered to be promising materials with easy tailorable new properties. The structure of hybrid glass is a silica network with incorporated organic particles or chains. A sol-gel process is a convenient method for preparing bulk glasses, as well as films and layers. The main advantage of the sol-gel technique is high homogeneity and purity of synthesised material. The sol-gel is the only method giving possibility to introduce organic molecules into the inorganic network on the molecular level. Incorporated organic molecules influence mechanical, optical and thermal properties of the silica network. Series of glasses with different amount of methyltrimethoxysilane have been prepared and characterised. Thermal decomposition of methyl modified silica hybrid glasses have been studied by DTA, FTIR and mass spectrometry.
4
Content available remote Glassy coatings for solar energy conversion
Siwulski S., Nocuń M., Gruszka B.
Optica Applicata
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2005
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Vol. 35, nr 4
895-900
EN
Glassy coatings have been shown to give very good corrosion protection to the steel substrate. Moreover they can also be utilised as a solar energy absorber. Introducing metallic particles into the glassy matrix can lead to coatings with improved mechanical strength and much higher thermal conductance of a resulting composite. Establishing of optimal conditions for synthesis of such coatings was the main goal of this work. The microstructure of the coatings was studied by SEM and optical microscopy while UV-VIS spectroscopy was used to estimate their optical properties.
5
Content available remote Diffusion colouring of glass with silver ions
Siwulski S., Nocuń M.
Optica Applicata
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2003
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Vol. 33, nr 1
155-160
EN
Surface colouring of glass through an exchange of sodium for silver ions has been studied. The influence of the main parameters of thermal treatment on the spectral properties of glass has been observed. The following techniques were applied: UV-VIS spectroscopy, differential thermal analysis (DTA), scanning electron microscopy (SEM) with energy disperse X-ray analysis (EDX) and photoelectron spectroscopy (XPS). Surface distribution as well as the chemical state of silver ions at different stages of thermal treatment has been investigated. The influence of the reduction atmosphere and ionizing radiation on glass colour and the chemical state of silver has also been studied. New information on glass colouring due to silver diffusion in one of the oldest colouring techniques has been obtained. It has been found that silver is present mainly in the form of AgO and Ag2O. In reduction conditions silver forms metallic particles with the mean size of 0.7 mm. Great chemical changes in the near surface region have been observed. Keywords: diffusion, glass, silver, XPS. Source: Optica Applicata, Vol.33, No. 1, 2003, pp. 155-160
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