Class Note for MSE 257A at UA
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This 3 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Arizona taught by a professor in Fall. Since its upload, it has received 18 views.
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Date Created: 02/06/15
1 Optical Properties of Glass 0 TRA1 o TTransmitted Light 0 RReflected Light 0 AAbsorbed Light 2 Types of Glass 0 Clear Glass 0 Opaque Glass Opalescent Glass 0 Scattering o Colored Glass 3 Selective transmissionabsorption o Eg Roman Lycurgus Cup made of gold and silver ruby glass It is green in reflection red in transmitted light 0 Transparent red glass absorbs all but red 700 nm Absorption I I I I I I I 400 500 600 700 Wavelength nm 0 Reflection curve shows peak at green 500 nm 4 Optical Effects Color 0 transition metal ions change absorption properties of glass 0 metal oxides dissolve into glass in low concentrations 0 unpaired electrons interact with incoming photons resulting in absorption 0 The effect of colorants depends on o the concentration of ions the type and mixture of ions the base glass what is the network former the oxidation state of the ion which depends on the firingmelting conditions melting time and temperature o Achievable Colors Color lon Black Mn3 Cu Red Cu Egyptians opaque glass Au Ruby glass cranberry glass Pink Mn4 Amber Fe3 Green Cu2 Fe2 Blue Cu2 C02 Violet Mn2 o Metals are colloidal dispersions not ions in the glass 0 Decolorizing glass 0 iron is an impurity in sand and Fe3 ions impart an amber color to glass A mixture of Fe2 and Fe3 ions impart a green color 0 Adding manganese ions to glass can decolorize it Optical effects Scattering 0 Surface Reflectivity 0 Internal scattering Reflectance 0 index of refraction specular reflectance 0 lead crystal reflects 6 of incident light high lead or barium containing glass 0 glass reflects 4 of incident light 0 smoothness of surface 0 surface roughness causes light to reflect diffusely o subsurface inclusions Metallic luster 0 metal particles precipitated at or close to the surface 0 low concentration 0 thinness allows transmission along with specular reflection Surface films surface iridescence o visible light reflected from surface some wavelengths reinforced others canceled 0 oil on water 0 at different angles apparent thickness varies as does the phenomenon lnternal Scattering o dispersed metals 0 ruby glass 0 colloidal gold or copper particles precipitate on first cool 0 reheat to strike the particles and grow them to about 400 nm bubbles minute crystals 0 use opalizing agents such as SnOz CaF2 or lead arsenate 3Pb2AsO42 PbO fluorides and phosphates good separate glass during cooling liquid emulsion or liquid and crystal 0 2 phases have very different indices of refraction can use heat treatment to grow crystals 10 Tiffany vase organic natural form and color consistent with Arts and Crafts MovementArt Nouveau manufacturing sequence 0 Paraison 0 Threads applied combed o Prunts deformed into lily pads o Blow into mold o Reheat in reduction for prunts 0 Finish 0 Fume chamber in creating iridescent layer 0 Anneal 0 Sign Metallic luster o AgZO solution 9 2 Ag 02 0 particles of Ag are 10 nm in size noncontinuous film 0 silvery in reflection luster yellowish in transmission lridescence o SnC2 FeCI3 0239 a Sno2 Fe203 o submicron particles of SnOz and Fe203 form 0 film is thickness of wavelength of light 400 nm Surface Texture 0 Smooth 9 satin 9 velvet o Buckled rumpled surface layer results in diffuse reflection 0 Thermal stress of iridescent layer 1 Thermal expansion coefficient of tin oxide 40 x 10396 C391 2 Thermal expansion coefficient of glass 8 x 10396 01 upon cooling glass shrinks more than coating 0 to remain coherent 1 glass stretches tension 2 surface buckles compression 3 usually this would shiver surface 4 surface buckling is possible due to superplasticity thin film acts ductile with particles sliding over one another
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