Through coupled electrochemical processes, reactant ion diffusion affected by electric field, and precipitation reactions, we offer a simple and new technique for forming precipitation patterns of Cu-Fe-based Prussian blue analogues (Cu-Fe PBA) in agarose gel. To observe the crystallites generated in the gel sample, several photos were taken with a steady increase in magnification. Visual inspection, Fe K intensity distribution measurements, and optical and scanning electron microscopy observations were used to analyse the precipitates' spatiotemporal evolution, spatial distribution, and crystallite morphologies. The applied voltage had an effect on the observed precipitation patterns and their progression. Under cyclic alternating voltage, multicoloured periodic precipitation bands were generated stochastically (4 V for 1 h and then 1 V for 4 h per cycle). The spacing between consecutive bars was distributed at random (0.30 0.25 mm). The crystallite sizes and shapes formed in the gel were position-dependent. In the periodic bands, cubic but very irregular crystallites (0.1–0.8 m) developed, whereas obviously cube-shaped crystallites (1–3 m) emerged near to the anode. Cu-FeII PBA was attributed to these cube-like reddish-brown crystallites. Plate-like blue crystallites (assigned to Cu(OH)2) were also found in several periodic bands. Future possibilities for using the observed periodic banding to selectively manufacture Cu-Fe PBA crystallites were addressed.
Author(S) Details
Hisashi Hayashi
Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo, 112-8681, Japan.
Tomoko Suzuki
Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo, 112-8681, Japan.
View Book:- https://stm.bookpi.org/NICB-V5/article/view/5144
No comments:
Post a Comment