Chemistry Reference
In-Depth Information
Fig. 3.21 Characterisation of Procion Black MX-K using thin-layer chromatography, and UV-Vis
and re
ection spectroscopy. a Hexane (Rf
f
= 0), b ethanol:water (1:1, v/v) (Rf
f
= 0.44), c acetone
(R
f,red
= 0.22), d ethanol:acetone (1:1, v/v) (R
f,red
= 0.22, R
f,blue
= 0.04), and e acetone:ethanol
(4:1, v/v) (R
f,red
= 0.66, R
f,blue
= 0.23) at 24
°
C. The upper black lines on the TLC plates represent
the solvent front. f Absorption spectrum of Procion MX-K. g Reflection spectrum of Procion
MX-K dyed
filter paper, and Fe
3
O
4
-paper composite
fl
(10
C for 5 min. DEKA-L
dye, sodium chloride and DI water were mixed with 2:1:40 (w/w/v). Nitrocellulose
membrane samples cut to 8 mm
100 mM) while varying the temperature from 23 to 70
°
-
2.5 cm were immersed into sealed dye baths.
DEKA-L dye bath was stored at 80
×
°
C for 2 days, and dyed nitrocellulose strips
were rinsed with DI water and dried.
Mass
flow rate of the paper substrates depends on the distribution of the pore
size and hydrophilicity. Procion MX-K dyed/plain Whatman
fl
filter/chromatography
papers were cut to 8 cm
8 mm and attached to a levelled surface. The strips were
lowered into a DI water bath with the tips immersed 3 mm and time lapse images
were taken in every 10 s (Fig.
3.22
a
×
c distance
was estimated (Fig.
3.22
d). Capillary rise depended on the density and
c). The time taken to wet a speci
-
