Abstract
Currently, most of the red colored glasses are still produced using cadmium sulfoselenide, despite its high toxicity. Alternative solutions, more environmentally friendly, have been sought, most of them going through the use of gold or copper nanoparticle, the color being obtained by striking.This work presents a new methodology for production of a red colored glass by the incorporation of gold nanoparticles in the melt, trying to take advantage of an amorphous silica layer involving the nanoparticles. Gold nanoparticles (AuNP) were produced by laser ablation synthesis in solution (LASiS), using a solution of tetraethyl orthosilicate (TEOS) and isopropanol (IPA).A xerogel was prepared using the TEOS:IPA:AuNp suspension, mixed with a alkaline-earth aluminosilicate colorless glass and melted at 1350 °C producing a glass with an intense and homogeneous ruby red color without the need of a striking stage.
Highlights
In both ruby glasses, whether obtained from cadmium selenide or from gold, the coloring is due to the existence of very small colloidal particles with sizes around 20 to 50 nm
Color was determined in the quenched glasses prepared with the AuNP-laser ablation synthesis in solution (LASiS) particles, gold (III) chloride trihydrate and with cadmium sulfoselenide (Cd(S,Se)), using the CIE L*a*b* chromatic coordinates on a Konica Minolta Chroma Meter CR-400, using D65 illuminant and 10o standard observer (Y:94.0, x:0.3156, y:0.3319)
Scanning transmission electron microscopy (STEM) observation of suspension samples prepared in the LASiS apparatus was carried out in transmission mode (Figure 3)
Summary
Whether obtained from cadmium selenide or from gold, the coloring is due to the existence of very small colloidal particles with sizes around 20 to 50 nm. In order to reduce the effect of fusion atmosphere on the final color or reduce or even eliminate the need for a striking step, the introduction of gold nanoparticles along with the other glass components arose as a possible improvement. Due to their increasing applicability, from catalysts to biomedicine, several gold nanoparticle production methodologies have emerged in recent years, many of which are extremely complex and costly, usually based on reduction reactions [4]. Adjusting the medium used it is possible to control the size distribution of the produced nanoparticles and the stability of the suspension [6,7,8]
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