scholarly journals Spontaneous precipitation pattern formation by crystallites of Mn–Fe-based Prussian blue analogues in agarose gel

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36240-36247 ◽  
Author(s):  
Hisashi Hayashi ◽  
Saya Aoki ◽  
Tomoko Suzuki
Keyword(s):  
Pattern Formation ◽  
Prussian Blue ◽  
Precipitation Pattern ◽  
Agarose Gel ◽  
Precipitation Patterns ◽  
Prussian Blue Analogues

Precipitation patterns spontaneously formed by Mn–Fe PBAs in agarose gel were investigated over wide concentrations ranges for the outer (0.10 ≤ [Mn2+] ≤ 0.70 M) and inner electrolytes (0.01 ≤ [[Fe(CN)6]3−] ≤ 0.35 M) by visual/SEM observations.

An XAFS study of Cs adsorption by the precipitation bands of Mn–Fe-based Prussian blue analogues spontaneously formed in agarose gel

2019 ◽  
Vol 21 (40) ◽  
pp. 22553-22562 ◽  
Author(s):  
Hisashi Hayashi ◽  
Saya Aoki ◽  
Mao Takaishi ◽  
Yui Sato ◽  
Hitoshi Abe
Keyword(s):  
Prussian Blue ◽  
Agarose Gel ◽  
Distribution Analysis ◽  
Prussian Blue Analogue ◽  
Xafs Spectroscopy ◽  
Prussian Blue Analogues

The adsorption of Cs+ ions by the precipitation bands of a Mn–Fe based Prussian blue analogue that form spontaneously in agarose gel was investigated by XAFS spectroscopy coupled with SEM and XRF distribution analysis.

In situ XRF analysis of Cs adsorption by the precipitation bands of Prussian blue analogues formed in agarose gels

2019 ◽  
Vol 34 (5) ◽  
pp. 979-985 ◽  
Author(s):  
Hisashi Hayashi ◽  
Yui Sato ◽  
Saya Aoki ◽  
Mao Takaishi
Keyword(s):  
Prussian Blue ◽  
Agarose Gel ◽  
X Ray ◽  
Agarose Gels ◽  
Xrf Analysis ◽  
Prussian Blue Analogues ◽  
Xrf Spectroscopy

The measurement of Cs adsorption by the precipitation bands of Mn-based Prussian blue analogues (PBAs), Co-based PBAs, and Prussian blue (PB), which were spontaneously formed in agarose gel, was carried out using in situ X-ray fluorescence (XRF) spectroscopy.

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.

Design and Synthesis of Concentration Gradient Prussian Blue Analogues

2021 ◽  
Vol 21 (2) ◽  
pp. 916-925
Author(s):  
SuKyung Jeon ◽  
Carissa H. Li ◽  
Daniel R. Talham
Keyword(s):  
Prussian Blue ◽  
Concentration Gradient ◽  
Design And Synthesis ◽  
Prussian Blue Analogues

Titelbild: Mesostructured Prussian Blue Analogues (Angew. Chem. 3/2008)

2007 ◽  
Vol 120 (3) ◽  
pp. 427-427
Author(s):  
Xavier Roy ◽  
Laurence K. Thompson ◽  
Neil Coombs ◽  
Mark J. MacLachlan
Keyword(s):  
Prussian Blue ◽  
Prussian Blue Analogues

scholarly journals “Green” Prussian Blue Analogues as Peroxidase Mimetics for Amperometric Sensing and Biosensing

Biosensors ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 193
Author(s):  
Galina Z. Gayda ◽  
Olha M. Demkiv ◽  
Yanna Gurianov ◽  
Roman Ya. Serkiz ◽  
Halyna M. Klepach ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Noble Metals ◽  
High Sensitivity ◽  
Graphite Electrodes ◽  
Flavocytochrome B2 ◽  
Prussian Blue Analogues ◽  
Scientific Investigations ◽  
Electrochemically Active ◽  
Amperometric Sensing ◽  
Prussian Blue Analogs

Prussian blue analogs (PBAs) are well-known artificial enzymes with peroxidase (PO)-like activity. PBAs have a high potential for applications in scientific investigations, industry, ecology and medicine. Being stable and both catalytically and electrochemically active, PBAs are promising in the construction of biosensors and biofuel cells. The “green” synthesis of PO-like PBAs using oxido-reductase flavocytochrome b2 is described in this study. When immobilized on graphite electrodes (GEs), the obtained green-synthesized PBAs or hexacyanoferrates (gHCFs) of transition and noble metals produced amperometric signals in response to H2O2. HCFs of copper, iron, palladium and other metals were synthesized and characterized by structure, size, catalytic properties and electro-mediator activities. The gCuHCF, as the most effective PO mimetic with a flower-like micro/nano superstructure, was used as an H2O2-sensitive platform for the development of a glucose oxidase (GO)-based biosensor. The GO/gCuHCF/GE biosensor exhibited high sensitivity (710 A M−1m−2), a broad linear range and good selectivity when tested on real samples of fruit juices. We propose that the gCuHCF and other gHCFs synthesized via enzymes may be used as artificial POs in amperometric oxidase-based (bio)sensors.

Bonding properties in Prussian blue analogues of the type Fe[Fe(CN)5X]·xH2O

1979 ◽  
Vol 41 (3) ◽  
pp. 287-292 ◽  
Author(s):  
E. Fluck ◽  
H. Inoue ◽  
M. Nagao ◽  
S. Yanagisawa
Keyword(s):  
Prussian Blue ◽  
Prussian Blue Analogues ◽  
Bonding Properties
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