Chrome-on-glass

Figure 13.1 Depiction of the glass-based lab-on-a-chip fabrication method. Shown in the figure is (a) the photoresist and chrome-coated glass substrate, (b) the coated substrate exposed to UV light through a mask (black rectangle), (c) removal of the exposed photoresist, (d) removal of the exposed chrome layer, (e) removal of glass by wet chemical etching, (f) removal of the bulk photoresist, and (g) removal of the bulk chrome layer.

In 1960 there were three commercial coupling agents a methacrylate-chrome complex (Volan ), vinyltriethoxysilane, and aminopropyltriethoxysilane. There was little evidence that Volan or vinyl silanes on glass actually copolymetized with unsaturated resins in composites. It was even more difficult to explain how Volan was almost as good as aminopropylsilanes in epoxy composites. There... 

Palacek M and Peters A (1984) A report by the International Commission on Glass Technical Committee 2 Durability and Analysis Recommended methods for the determination of titania, alumina, Ume, and magnesia in chrome green soda-Ume-magnesia-silica glasses. Glass Technology 25(2) 55-61. 

For gas chromatographic analysis of the products, the submitter used a 3 ft. x 0.125 in. stainless steel column of 5% LAC-446 (cross-linked diethylene glycol-adipic ester) on Diatoport S (60-80 mesh), which was heated at 140° and swept with prepurified nitrogen at 30 ml. per minute. The four isomers were observed as three peaks at retention times of 3.08, 3.69, and 4.07 minutes. The checkers used aim. x 4 mm. glass column of 10% DECS on Gas Chrome Q (60-80 mesh), which was heated at 200° and swept with prepurified nitrogen at 75 ml. per minute. 

Fig. 5 Schematic of electrodes on a glass substrate. The thickness of the chrome and gold layer (5 + 50nm) and the gap between the electrodes (10 im) are not true to scale. The size of the arrangement (sample size) is about 6x6x 1mm3. The electric field is homogeneous between the electrodes. Reprinted with permission from [33]. Copyright 2009 American Chemical Society...

In a large lead-lined vessel, 300 grams of sublimed, still moist, anthracene (calculated on the basis of 100 per cent product) is stirred with 6 liters of water and 600 grams of sodium bichromate. The mixture is heated to 80°C. over a Fletcher burner, and 1800 grams of 50 per cent sulfuric acid is added over a period of 10 hours. Chromic-acid should always be present, and the mixture should be stirred with a wooden or glass rod. Finally, the mixture is boiled for 2 hours, replacing the water lost by evaporation. The precipitate is then filtered off and washed thoroughly. The mother liquor can be worked up to recover chrome alum or chromic sulfate. 

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