Optical properties of the polymers in solution display additive bands in the absorbance spectrum and luminescent properties in the emission region of the individual dye monomers.
Comparing with the individual dye-sensitized solar cell, an efficiency increase of 10% has been obtained for the hybrid tandem cell.
Importantly, the research offers almost no clue about the relative risks of individual dyes, making specific regulatory actions against, say, Green No. 3 or Yellow No. 6 almost impossible.
After development, spots were visualised and the R F values were calculated for individual dyes.
And such result was verified by the color difference measurement of the degraded silk dyed with individual dye solution.
Second, individual dye solutions of berberine, palmatine, alizarin, purpurin, and indigotin were separately made by adding 0.025 g dye in 75 mL water.
A new silk sample weighing 2.45 g was iron mordanted, and dyed using the same procedure as above using individual dye solutions.
Silk were dyed using either a mixed dye solution of five dyes or individual dye solutions and each were degraded for 7 and 14 days, respectively, and the dye was extracted from the samples for the HPLC analysis.
For silk samples dyed with individual dye solutions, the color measurement was carried out using a JS-555 spectro-colorimeter (Color Techno System, Japan) under D65 illuminant and 10° standard observer at three spots and the average data were reported.
Color differences of alum mordanted silk and iron mordanted silk dyed with individual dye solution, after 0 ~ 14 days of thermal degradation treatment are illustrated in Figure 9 and Figure 10, respectively.
