Wet Stamping of Microscale Periodic Precipitation Patterns

2005 ◽  
Vol 109 (7) ◽  
pp. 2774-2778 ◽  
Author(s):  
I. T. Bensemann ◽  
M. Fialkowski ◽  
B. A. Grzybowski
Keyword(s):  
Periodic Precipitation ◽  
Precipitation Patterns

Gravity Effect on the Formation of Periodic Precipitation Patterns

2000 ◽  
Vol 65 (9) ◽  
pp. 1438-1442 ◽  
Author(s):  
Vladislav Holba ◽  
Frederik Fusek
Keyword(s):  
Gravitational Field ◽  
Spatial Arrangement ◽  
Experimental Results ◽  
Single Sample ◽  
Gravity Effect ◽  
Periodic Precipitation ◽  
Precipitation Patterns ◽  
Liesegang Bands

The effect of gravity on the formation of Liesegang patterns of Ag2Cr2O7in gelatin and that of PbI2in agar was investigated. Spatial arrangement of Liesegang bands was measured in the parallel and antiparallel orientation to the gravitational field in a single sample with all other parameters kept fixed. The experimental results are discussed in terms of the prenucleation theory of periodic precipitation.

Independence of Primary and Secondary Structures in Periodic Precipitation Patterns

2011 ◽  
Vol 2 (4) ◽  
pp. 345-349 ◽  
Author(s):  
Stoyan K. Smoukov ◽  
István Lagzi ◽  
Bartosz A. Grzybowski
Keyword(s):  
Secondary Structures ◽  
Periodic Precipitation ◽  
Precipitation Patterns

Curiosities in Periodic Precipitation Patterns

Science ◽  
1982 ◽  
Vol 216 (4546) ◽  
pp. 635-637 ◽  
Author(s):  
S. C. MULLER ◽  
S. KAI ◽  
J. ROSS
Keyword(s):  
Periodic Precipitation ◽  
Precipitation Patterns

Periodic Precipitation Patterns during Coalescence of Reacting Sessile Droplets

Langmuir ◽  
2015 ◽  
Vol 31 (42) ◽  
pp. 11484-11490 ◽  
Author(s):  
Marie Jehannin ◽  
Sophie Charton ◽  
Stefan Karpitschka ◽  
Thomas Zemb ◽  
Helmuth Möhwald ◽  
...  
Keyword(s):  
Periodic Precipitation ◽  
Precipitation Patterns

scholarly journals A Reaction–Diffusion–Reaction System for Forming Periodic Precipitation Bands of Cu-Fe-Based Prussian Blue Analogues

2021 ◽  
Vol 11 (11) ◽  
pp. 5000
Author(s):  
Hisashi Hayashi ◽  
Tomoko Suzuki
Keyword(s):  
Prussian Blue ◽  
Reaction System ◽  
Reaction Diffusion ◽  
Diffusion Reaction ◽  
Ion Diffusion ◽  
Periodic Precipitation ◽  
Precipitation Patterns ◽  
Prussian Blue Analogues ◽  
Potential Applications ◽  
Alternating Voltage

We propose a simple and novel system to form precipitation patterns of Cu-Fe-based Prussian blue analogues (Cu-Fe PBA) in agarose gel through coupled electrochemical reactions, reactant ion diffusion influenced by electric field, and precipitation reactions. The spatiotemporal evolution, spatial distribution, and crystallite morphologies of the precipitates were investigated by visual inspection, Fe Kα intensity distribution measurements, and optical and scanning electron microscope observations. The observed precipitation patterns and their evolution depended on the applied voltage. Multicolored periodic precipitation bands were stochastically formed under cyclic alternating voltage (4 V for 1 h and then 1 V for 4 h per cycle). The distances between adjacent bands were randomly distributed (0.30 ± 0.25 mm). The sizes and shapes of the crystallites generated in the gel were position-dependent. Cubic but fairly irregular crystallites (0.1–0.8 μm) were formed in the periodic bands, whereas definitely cube-shaped crystallites (1–3 μm) appeared close to the anode. These cube-like reddish–brown crystallites were assigned to Cu-FeII PBA. In some periodic bands, plate-like blue crystallites (assigned to Cu(OH)2) were also present. Future issues for potential applications of the observed periodic banding for selective preparation of Cu-Fe PBA crystallites were discussed.

scholarly journals An Electrochemical System for Forming Periodic Precipitation Bands of Cu-Fe-Based Prussian Blue Analogues

2021 ◽  
Author(s):  
Hisashi Hayashi ◽  
Tomoko Suzuki
Keyword(s):  
Prussian Blue ◽  
Applied Voltage ◽  
Visual Inspection ◽  
Electrochemical System ◽  
Spatiotemporal Evolution ◽  
Agarose Gels ◽  
Periodic Precipitation ◽  
Precipitation Patterns ◽  
Prussian Blue Analogues ◽  
Alternating Voltage

We propose a novel electrochemical system to form precipitation patterns of Cu-Fe-based Prussian blue analogues (Cu-Fe PBA) in agarose gels, using an applied voltage to produce reactant ions. The spatiotemporal evolution, spatial distribution, and crystallite morphologies of the precipitates were investigated by visual inspection, Fe Kα intensity distribution measurements, and optical and scanning electron microscope observations. The precipitation patterns and their evolution depended on the applied voltage. Multicolored periodic precipitation bands were stochastically formed under cyclic alternating voltage (4 V for 1 h and then 1 V for 4 h per cycle). The distances between adjacent bands were randomly distributed (0.30 ± 0.25 mm). The sizes and shapes of the crystallites generated in the gel were position-dependent. Almost cubic but fairly irregular crystallites (0.1–0.8 μm) were formed in the periodic bands, whereas definitely cube-shaped crystallites (1–3 μm) appeared close to the anode. These cube-like reddish-brown crystallites were assigned to Cu-FeII PBA. In some periodic bands, plate-like blue crystallites (assigned to Cu(OH)2) were also present. Future issues for applications of the observed periodic banding were discussed.

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