Gold nanoparticles in glass

Sphere gold particles 25 nm, in glass reflect red
Sphere gold particles 50 nm, in glass reflect green
Sphere gold particles 100 nm, in glass reflect orange
Sphere silver particles 100nm in glass reflect yellow
Sphere silver particles 40 nm in glass reflect blue
Prism shape silver particles 100 nm, in glass reflect red


http://mrsec.wisc.edu/Edetc/SlideShow/slides/quantum_dot/stained_glass.html


Measurement of temperatur for glasses

In contrast to the viscosity the thermal expansion, heat capacity, and many other properties of inorganic glasses show a relatively sudden change at the glass transition temperature. This effect is used for measurement by Differential scanning calorimetry (DSC) and dilatometry.

The viscosity at the glass transition temperature depends on the sample preparation (especially the cooling curve), the heating or cooling curve during measurement and the chemical composition.[4] In general, the glass transition temperature is close to the annealing point of glasses at 1013 poise = 1012 Pa·s. For dilatometric measurements heating rates of 3-5 K/min are common, for DSC measurements 10 K/min, considering that the heating rate during measurement should equal the cooling rate during sample preparation.

www.Wikipedia.com

O. V. Mazurin, Yu. V. Gankin: "Glass transition temperature: problems of measurements and analysis of the existing data"; Proceedings, International Congress on Glass, July 1-6, 2007, Strasbourg, France.