Metal nanostructured colorants for high redox glass
A colorant for a high redox glass composition comprising: total iron (Fe 2 O 3 ) 0 to 1.1 weight percent; and from 0.0001 to 0.15 weight percent of at least one of the following: Cu nanostructures, Au nanostructures, or Ag nanostructures, wherein the weight percents are based on the total weight of the glass composition. The colorant of the invention can be used to make glass compositions having various colors.
1. A method for forming a colored glass article in a single heating step, comprising the steps of:
providing a glass batch composition comprising a base glass portion comprising:
SiO 2
66 to 75
weight percent
Na 2 O
10 to 20
weight percent
CaO
5 to 15
weight percent
MgO
0 to 5
weight percent
Al 2 O 3
0 to 5
weight percent
K 2 O
0 to 5
weight percent
BaO
0 to 1
weight percent
Bi 2 O 3
0 to 5
weight percent
total iron (Fe 2 O 3 )
to provide a redox ratio of >0.35;
providing a colorant portion comprising precursor materials for at least one of Cu nanostructures, Au nanostructures, or Ag nanostructures, wherein the Cu nanostructures precursor is selected from the group consisting of copper containing sulfates, copper containing nitrates, and copper containing oxides; the Au nanostructures precursor is selected from the group consisting of hydrogen tetrachloreaurate (III) tri-hydrate (HAuCl 4 .3H 2 O), gold (III) chloride, gold (III) oxide, sodium aurothiomalate hydrate, and gold (III) hydroxide; and the Ag nanostructures precursor is selected from the group consisting of silver nitrate (AgNO 3 ), silver chloride, silver oxide, silver acetate, silver perchlorate, and silver acetylacetonate;
heating the glass batch composition and colorant portion in a single heating step to form molten glass of a desired color having at least one of 0.0001 to 0.15 weight percent of Cu nanostructures, <0.01 weight percent of Au nanostructures, or <0.01 weight percent of Ag nanostructures;
depositing the molten glass on a bath of molten tin to form a glass ribbon of the desired color; and
removing the glass ribbon from the molten tin bath to form glass sheets of the desired color.
2. The method according to claim 1 , wherein the amount of total iron ranges from 0.005 to 0.40 weight percent.
3. The method according to claim 1 , further comprising adding at least one of the following to the batch material: cobalt, nickel, neodymium oxide, erbium, vanadium and chrome oxide.
4. The method according to claim 3 , further comprising adding cobalt in an amount ranging up to 500 PPM.
5. The method according to claim 1 , further comprising adding selenium in an amount up to 50 PPM.
6. The method according to claim 1 , further comprising adding at least one reducing agent selected from stannous oxide (SnO), selenium (Se), tellurium dioxide (TeO 2 ), bismuth oxide (Bi 2 O 3 ), or anthracite powdered coal.
7. A glass article made from the method of claim 1 .