Artículos de revistas: "Ferricyanide ion"

1

Hipps, K. W., Erik Dunkle y Ursula Mazur. "Adsorption of ferricyanide ion on alumina". Langmuir 4, n.º 2 (marzo de 1988): 463–69. http://dx.doi.org/10.1021/la00080a038.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

2

Carvalho, Rui N. L., Cristina M. Cordas y Luís J. P. da Fonseca. "Electrode Kinetics of Ion Jelly and Ion Sol-Gel Redox Materials on Screen-Printed Electrodes". Applied Sciences 12, n.º 4 (17 de febrero de 2022): 2087. http://dx.doi.org/10.3390/app12042087.

Texto completo

Resumen

Several hydrogel materials have been proposed for drug delivery systems and other purposes as interfacial materials, such as components for fuel cells and immobilization of biomolecules. In the present work, two materials, an ion sol-gel, based on 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and an ion jelly (1-ethyl-3-methylimidazolium ethylsulfate) film deposited on carbon screen-printed electrodes, were electrochemically characterized. The electrode kinetics of ion jelly and ion sol-gel materials were compared by using ferrocyanide/ferricyanide redox reaction couple as a model redox process. Diffusion coefficients were calculated and compared to those obtained with the model redox couple in non-modified electrodes. Results pointed to a decrease of two and four orders of magnitude in the diffusion coefficients, respectively, for ion jelly and ion sol-gel film modified electrodes. Heterogeneous electron transfer constants for the ferrocyanide/ferricyanide ion redox process were also determined for modified and non-modified electrodes, in which the ion sol-gel film modified electrode presented the lower values. This work sought to contribute to the understanding of these materials’ properties, with emphasis on their diffusion, conductivity, and electrochemical behavior, namely reversibility, transfer coefficients, and kinetics, and optimize the most suitable properties for different possible applications, such as drug delivery.

Los estilos APA, Harvard, Vancouver, ISO, etc.

3

Mbadcam, J. Ketcha, G. F. Tchatat Wouaha y V. Hambate Gomdje. "Adsorption of Ferricyanide Ion onActivated Carbon and γ-Alumina". E-Journal of Chemistry 7, n.º 3 (2010): 721–26. http://dx.doi.org/10.1155/2010/645479.

Texto completo

Resumen

Iron-cyanide complexes are present in soil and ground water due to anthropogenic inputs. We compared the adsorption of ferricyanide ion, on two commercial activated carbons (COM3 and COM4) and γ-alumina (A1G) in aqueous solution. Isotherm parameters obtained from batch experiments of iron-cyanide complex adsorption on these adsorbents were carried-out. The mass of the adsorbents were varied at 40 mg, 60 mg and 100 mg and the inorganic ion initial concentrations, Coalso varied between 3.04×10-4and 2.43×10-3mol/L. The equilibrium data obtained were tested by using the Langmuir and Freundlich isotherm models. These data fit well with the Langmuir and Freundlich isotherm models at this low inorganic ion initial concentration.

Los estilos APA, Harvard, Vancouver, ISO, etc.

4

Engel, Nicholas, Sergey I. Bokarev, Alexandre Moguilevski, Azhr A. Raheem, Ruba Al-Obaidi, Tobias Möhle, Gilbert Grell et al. "Light-induced relaxation dynamics of the ferricyanide ion revisited by ultrafast XUV photoelectron spectroscopy". Physical Chemistry Chemical Physics 19, n.º 22 (2017): 14248–55. http://dx.doi.org/10.1039/c7cp01288h.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

5

Bunting, John W. y Dimitrios Stefanidis. "Relative reactivities of heteroaromatic cations toward ferricyanide ion oxidation". Journal of Organic Chemistry 51, n.º 11 (mayo de 1986): 2068–71. http://dx.doi.org/10.1021/jo00361a025.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

6

Domingo, Pedro L., Begoña García y José M. Leal. "Acid–base behaviour of the ferricyanide ion in perchloric acid media. Spectrophotometric and kinetic study". Canadian Journal of Chemistry 68, n.º 2 (1 de febrero de 1990): 228–35. http://dx.doi.org/10.1139/v90-030.

Texto completo

Resumen

A wide study was carried out of the acid–base behaviour of ferricyanide ions in aqueous perchloric acid media in the range 0.1–11.5 M. This study shows that protonation and decomposition of the ferricyanide ions occur simultaneously. The three successive protonation equilibria were found in the acidity ranges 0.1–4.0, 3.5–8.5, and 7.0–11.5 M HClO4, respectively. A kinetic study was also made of the decomposition reaction at 60 °C. The kinetic data are explained by considering a reaction mechanism involving homolytic and heterolytic dissociation steps. The homolytic and heterolytic rate constants corresponding to each of the four protonated species were determined, along with the acid–base protonation constants, pK1 = −6.25 ± 0.10; pK2 = −3.23 ± 0.03; and pK3 = −0.60 ± 0.02. Keywords: acid–base behaviour, protonated species, decomposition, homolytic dissociation, heterolytic dissociation.

Los estilos APA, Harvard, Vancouver, ISO, etc.

7

Bunting, John W. y Dimitrios Stefanidis. "Kinetics of the oxidation of isoquinolinium cations by ferricyanide ion". Journal of Organic Chemistry 51, n.º 11 (mayo de 1986): 2060–67. http://dx.doi.org/10.1021/jo00361a024.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

8

del CASTILLO-OLIVARES, Antonio, Miguel A. MEDINA, Ignacio NÚÑEZ de CASTRO y Javier MÁRQUEZ. "Purification and characterization of a plasma membrane ferricyanide-utilizing NADH dehydrogenase from Ehrlich tumour cells". Biochemical Journal 314, n.º 2 (1 de marzo de 1996): 587–93. http://dx.doi.org/10.1042/bj3140587.

Texto completo

Resumen

A ferricyanide-utilizing NADH dehydrogenase (NADH-ferricyanide oxidoreductase) from the plasma membrane of Ehrlich ascites tumour cells has been purified about 1500-fold to apparent homogeneity. The method comprises the isolation of an enriched plasma membrane fraction, solubilization with Triton X-100, ion-exchange chromatography, ammonium sulphate precipitation, Cibacron Blue chromatography and fast-protein liquid chromatography with a Superose-6 gel filtration column. The specific activity of the final pool was more than 61 units/mg protein. The pure enzyme examined by SDS/PAGE displayed only one type of subunit with an apparent molecular mass of 32.0 kDa. The molecular mass of the native protein (117.0 kDa) was estimated by gel filtration; these results suggest a protein composed of four subunits of identical molecular mass. The enzyme was stable in the pH interval between 6 and 9, with maximum activity at pH values from 7.5 to 8.5. The purified enzyme showed Michaelis–Menten kinetics for the substrates, with apparent Km values of 4.3×10-5 M and 6.7×10-5 M for NADH and ferricyanide respectively. The isolated protein was strongly inhibited by Zn2+ and the thiol-specific reagents mersalyl and p-chloromercuribenzenesulphonic acid.

Los estilos APA, Harvard, Vancouver, ISO, etc.

9

HONDA, Kazuhiro. "Acceleration of Reduction of Ferricyanide Ion by Cyanide Ion in Aqueous Solution under Freezing Process." Journal of the Surface Finishing Society of Japan 50, n.º 2 (1999): 225–30. http://dx.doi.org/10.4139/sfj.50.225.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

10

Maneva, Ana, Borislava Taleva y Lilia Maneva. "Lactoferrin-Protector against Oxidative Stress and Regulator of Glycolysis in Human Erythrocytes". Zeitschrift für Naturforschung C 58, n.º 3-4 (1 de abril de 2003): 256–62. http://dx.doi.org/10.1515/znc-2003-3-420.

Texto completo

Resumen

Binding of lactoferrin (Lf) to its membrane receptors requires an electron for the reduction of Fe3+LF to Fe2+LF. It is possible that glyceraldehyde D3-phosphate dehydrogenase, a glycolytic enzyme part of the erythrocyte membrane, delivers that electron. Then Lf, obtaining an electron from the coenzyme NADH, might stimulate glycolysis, which requires the oxidised state of the coenzyme NAD+. Such possibility is supported by the finding that another extracellular e- acceptor - potassium ferricyanide activates glycolysis by the similar mechanism. Present results show that ferricyanide inhibited the specific 59Fe-lactoferrin binding to its erythrocyte membrane receptors. It may be assumed that ferricyanide competes with lactoferrin for an electron which leads to decrease of the binding of 59Fe-lactoferrin to its receptors. Lactoferrin (50 and 100 nm), similar to ferricyanide, increased the accumulation of lactate (respectively by 25% and 30%). These results support the assumption that ferricyanide and lactoferrin are final acceptors of a common electron transport chain connected with the regulation of glycolysis.We established an antioxidative effect of lactoferrin on erythrocytes, which was expressed as: a) an influence on content and on activity of intracellular antioxidants - namely an enhancement of the content of reduced glutathione; b) a decreased content both of products of lipid peroxidation (thiobarbituric acid reactive substances) and hemolysis under normal conditions and oxidative stress.Lactoferrin is capable to bind metal ions and thus to block their catalytic participation in the oxidative disturbances of the membrane. In most of our experiments there were no metal ions in the incubation mixtures (except those stimulating oxidative stress). Our results showed that Lf limited both the generation of thiobarbituric acid reactive substances and hemolysis in the absence of metal ions in the media, as well as in their presence. These facts suggest that probably the antioxidative property of lactoferrin is glycolysis stimulation, leading to increased formation of ATP, which is necessary to maintain the ion gradient, membrane potential and morphology of the erythrocyte.

Los estilos APA, Harvard, Vancouver, ISO, etc.

11

Devi, Selvaraj y Kannaiyan Pandian. "Synthesis of Chitosan Protected Nickel Hexacyanoferrate Modified Titanium Oxide Nanotube and Study its Application on Simultaneous Electrochemical Detection of Paracetamol and Caffeine". Advanced Materials Research 938 (junio de 2014): 192–98. http://dx.doi.org/10.4028/www.scientific.net/amr.938.192.

Texto completo

Resumen

The nickel hexacyanoferrate decorated titanium oxide nanotube (NiHCF@TNT) was prepared by ion exchange method by mixing of nickel ion modified titanium oxide nanotube with a known amount of potassium ferricyanide under stirring over a period of 5 h. The resulting product was isolated and then characterized with XRD, FT-IR and SEM. The electrochemical behaviour of NiHCF@TNT was investigated by cyclic voltammetry using chitosan as stabilizing agent. The electrocatalytic property of chitosan protected NiHCF@TNT was carried out on electrochemical oxidation of paracetamol and caffeine simultaneously. The proposed method may be applied for the electrochemical detection of paracetamol in drug samples. _______________________________________________________________________________

Los estilos APA, Harvard, Vancouver, ISO, etc.

12

Dewi, Eniya Listiani, Hiroko Nakano, Kenichi Oyaizu, Hiroyuki Nishide y Eishun Tsuchida. "Ion-Exchange and Apparent Diffusion Coefficients Within Cationic Polysulfonium Coatings Containing Ferricyanide". Journal of Macromolecular Science, Part A 40, n.º 1 (3 de enero de 2003): 37–47. http://dx.doi.org/10.1081/ma-120016672.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

13

Uchiyama, Shunichi, Yuichi Kurokawa, Yasushi Hasebe y Shuichi Suzuki. "Rapid coulometry of tocopherols in ethanol and chloroform using ferricyanide ion mediator". Electroanalysis 6, n.º 1 (enero de 1994): 63–66. http://dx.doi.org/10.1002/elan.1140060112.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

14

Abbas, Khamis y Deeb Marji. "Oxidation of Triethylamine by Ferricyanide Ions in the Presence of Sodium Hydroxide and Potassium Hydroxide". Zeitschrift für Naturforschung A 60, n.º 8-9 (1 de septiembre de 2005): 667–71. http://dx.doi.org/10.1515/zna-2005-8-918.

Texto completo

Resumen

The rate of the oxidation of triethylamine by ferricyanide ions in sodium hydroxide or potassium hydroxide solutions has been determined spectrophotometrically at 25℃. Analysis of the kinetic data indicates that the hydroxide ion does not appear in the rate law. Strong retardation of the oxidation of triethylamine, caused by the addition of ferrocyanide ions, has been observed. A plausible mechanism is suggested, and a suitable rate law, congruent with the experimental observations, has been derived.

Los estilos APA, Harvard, Vancouver, ISO, etc.

15

Sarhid, Iyad, Isabelle Lampre, Diana Dragoe, Patricia Beaunier, Bruno Palpant y Hynd Remita. "Hexacyano Ferrate (III) Reduction by Electron Transfer Induced by Plasmonic Catalysis on Gold Nanoparticles". Materials 12, n.º 18 (17 de septiembre de 2019): 3012. http://dx.doi.org/10.3390/ma12183012.

Texto completo

Resumen

Redox reactions are of great importance in environmental catalysis. Gold nanoparticles (Au-NPs) have attracted much attention because of their catalytic activity and their localized surface plasmon resonance (LSPR). In the present study, we investigated, in detail, the reduction of ferricyanide (III) ion into a ferrocyanide (II) ion catalyzed by spherical gold nanoparticles of two different sizes, 15 nm and 30 nm, and excited at their LSPR band. Experiments were conducted in the presence (or absence) of sodium thiosulfate. This catalysis is enhanced in the presence of Au- NPs under visible light excitation. This reduction also takes place even without sodium thiosulfate. Our results demonstrate the implication of hot electrons in this reduction.

Los estilos APA, Harvard, Vancouver, ISO, etc.

16

范, 旭良. "The Sodium Ion Storage Process of Nickel Ferricyanide Cathode in the Natural Seawater". Advances in Energy and Power Engineering 09, n.º 04 (2021): 191–97. http://dx.doi.org/10.12677/aepe.2021.94021.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

17

HAN, Xiaojun y Erkang WANG. "Ion-Channel Sensing of Ferricyanide Anion Based on a Supported Bilayer Lipid Membrane." Analytical Sciences 17, n.º 10 (2001): 1171–74. http://dx.doi.org/10.2116/analsci.17.1171.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

18

You, Ya, Xing-Long Wu, Ya-Xia Yin y Yu-Guo Guo. "A zero-strain insertion cathode material of nickel ferricyanide for sodium-ion batteries". Journal of Materials Chemistry A 1, n.º 45 (2013): 14061. http://dx.doi.org/10.1039/c3ta13223d.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

19

Chatterjee, Debabrata y Alak Kr Ghosh. "Kinetics of the interaction of aquo-ethylenediaminetetraacetatoruthenate(III) with ferricyanide ion in water". Transition Metal Chemistry 16, n.º 5 (octubre de 1991): 481–83. http://dx.doi.org/10.1007/bf01024311.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

20

Fan, Jiaxin, Yaobing Fang, Qiangqiang Xiao, Runyu Huang, Li Li y Wenhui Yuan. "A Dual‐Ion Battery with a Ferric Ferricyanide Anode Enabling Reversible Na+Intercalation". Energy Technology 7, n.º 4 (25 de marzo de 2019): 1800978. http://dx.doi.org/10.1002/ente.201800978.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

21

Bongard, R. D., M. P. Merker, R. Shundo, Y. Okamoto, D. L. Roerig, J. H. Linehan y C. A. Dawson. "Reduction of thiazine dyes by bovine pulmonary arterial endothelial cells in culture". American Journal of Physiology-Lung Cellular and Molecular Physiology 269, n.º 1 (1 de julio de 1995): L78—L84. http://dx.doi.org/10.1152/ajplung.1995.269.1.l78.

Texto completo

Resumen

The uptake of methylene blue (MB), and toluidine blue O (TBO) by bovine pulmonary arterial endothelial cells grown on microcarrier beads was detected as a decrease in the concentration of dye in the medium after these thiazine dyes were added to the medium surrounding the cells. Because the reduced forms of these dyes are much more lipophilic than the oxidized forms, we considered the possibility that reduction of the dyes at the cell surface might have preceded the uptake by the cells. Therefore, we studied the ability of the cells to reduce a toluidine blue O-polyacrylamide polymer (TBOP), which was too large to enter the cells in either the oxidized or reduced form. The TBO moieties of the polymer were reduced by the cells, indicating that the dyes did not have to enter the cells to be reduced and that reduction can occur at, or near, the cell surface. The rate of TBOP reduction was about the same as the rate of uptake of the monomeric dyes, indicating that the cell surface reduction mechanism had a sufficient capacity to account for the monomer uptake by the cells. We also found that ferricyanide ion, which also did not permeate the cells, was reduced by the cells and that external ferricyanide inhibited the monomeric MB uptake. Thus the results with ferricyanide were also consistent with the concept that the monomeric thiazine dyes are reduced at the cell surface before the more lipophilic reduced forms are taken up by the endothelial cells.

Los estilos APA, Harvard, Vancouver, ISO, etc.

22

Keresten, Valentina y Konstantin Mikhelson. "Voltammetric Ion Sensing with Ionophore-Based Ion-Selective Electrodes Containing Internal Aqueous Solution, Improving Lifetime of Sensors". Membranes 12, n.º 11 (27 de octubre de 2022): 1048. http://dx.doi.org/10.3390/membranes12111048.

Texto completo

Resumen

The possibility of voltammetric ion sensing is demonstrated, for the first time, for ion-selective electrodes (ISEs) containing an internal aqueous solution. ISEs selective to calcium, lithium and potassium ions are used as model systems. The internal solution of the ISEs contains a chloride salt of the respective cation and a ferrocenemethanol or ferrocyanide/ferricyanide redox couple. A platinum wire is used as the internal reference electrode. It is shown, theoretically and experimentally, that the dependence of oxidation and reduction peak potentials on the sample composition obeys the Nernst law, while the peak currents virtually do not depend on the sample composition. Thus, the electrode behavior is similar to that reported by Bakker’s group for solid contact ISEs with ultra-thin membranes (200–300 nm). It is shown that the use of classical ISEs with relatively thick membranes (100–300 µm) and internal aqueous solution allows for the sensor lifetime of about one month. It is also shown that use of a suitable background electrolyte allows for improvement of the detection limits in voltammetric measurements with ISEs.

Los estilos APA, Harvard, Vancouver, ISO, etc.

23

Usuda, Hatsuho, Yoshie Mishima, Tohru Kawamoto y Kimitaka Minami. "Desorption of Ammonia Adsorbed on Prussian Blue Analogs by Washing with Saturated Ammonium Hydrogen Carbonate Solution". Molecules 27, n.º 24 (13 de diciembre de 2022): 8840. http://dx.doi.org/10.3390/molecules27248840.

Texto completo

Resumen

Prussian blue analogs (PBAs) have been reported as promising ammonia (NH3) adsorbents with a high capacity compared to activated carbon, zeolite, and ion exchange resins. The adsorbed NH3 was desorbed by heating and washing with water or acid. Recently, we demonstrated that desorption was also possible by washing with a saturated ammonium hydrogen carbonate solution (sat. NH4HCO3aq) and recovered NH3 as an NH4HCO3 solid by introducing CO2 into the washing liquid after desorption. However, this has only been proven for copper ferrocyanide and the relationship between the adsorption/desorption behavior and metal ions in PBAs has not been identified. In this study, we investigated the adsorption/desorption behavior of PBAs that are complexes of first row transition metals with hexacyanometalate anions. Six types of PBAs were tested in this study and copper ferricyanide exhibited the highest desorption/adsorption ratio. X-ray diffraction results revealed high structural stability for cobalt hexacyanocobaltate (CoHCC) and nickel ferricyanide (NiHCF). The Fourier transform infrared spectroscopy results showed that the NH3 adsorbed on the vacancy sites tended to desorb compared to the NH3 adsorbed on the interstitial sites as ammonium ions. Interestingly, the desorption/adsorption ratio exhibited the Irving-Williams order.

Los estilos APA, Harvard, Vancouver, ISO, etc.

24

Lounasvuori, Mailis M., Martin Rosillo-Lopez, Christoph G. Salzmann, Daren J. Caruana y Katherine B. Holt. "Electrochemical characterisation of graphene nanoflakes with functionalised edges". Faraday Discuss. 172 (2014): 293–310. http://dx.doi.org/10.1039/c4fd00034j.

Texto completo

Resumen

Graphene nanoflakes (GNF) of diameter ca. 30 nm and edge-terminated with carboxylic acid (COOH) or amide functionalities were characterised electrochemically after drop-coating onto a boron-doped diamond (BDD) electrode. In the presence of the outer-sphere redox probe ferrocenemethanol there was no discernible difference in electrochemical response between the clean BDD and GNF-modified electrodes. When ferricyanide or hydroquinone were used as redox probes there was a marked difference in response at the electrode modified with COOH-terminated GNF in comparison to the unmodified BDD and amide-terminated GNF electrode. The response of the COOH-terminated GNF electrode was highly pH dependent, with the most dramatic differences in response noted at pH < 8. This pH range coincides with partial protonation of the carboxylic acid groups as determined by titration. The acid edge groups occupy a range of bonding environments and are observed to undergo deprotonation over a pH range ca. 3.7 to 8.3. The protonation state of the GNF influences the oxidation mechanism of hydroquinone and in particular the number of solution protons involved in the reaction mechanism. The voltammetric response of ferricyanide is very inhibited by the presence of COOH-terminated GNF at pH < 8, especially in low ionic strength solution. While the protonation state of the GNF is clearly a major factor in the observed response, the exact role of the acid group in the redox process has not been firmly established. It may be that the ferricyanide species is unstable in the solution environment surrounding the GNF, where dynamic protonation equilibria are at play, perhaps through disruption to ion pairing.

Los estilos APA, Harvard, Vancouver, ISO, etc.

25

Kumar, Arun, Rajesh, Asha Chaubey, S. K. Grover y B. D. Malhotra. "Immobilization of cholesterol oxidase and potassium ferricyanide on dodecylbenzene sulfonate ion-doped polypyrrole film". Journal of Applied Polymer Science 82, n.º 14 (2001): 3486–91. http://dx.doi.org/10.1002/app.2210.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

26

Chen, Meng Yao, Bo Lai, Yu Fei Zhou y Guo Quan Zhang. "Electrocatalytic Activity of Fe-N Doped Carbon Material Derived from Polyaniline-Prussian Blue Composite towards Oxygen Reduction Reaction". Advanced Materials Research 1051 (octubre de 2014): 186–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.186.

Texto completo

Resumen

Doped carbon materials have been recognized as a promising non-Pt cathode catalyst for oxygen reduction reaction (ORR). We prepared a new Fe-N codoped carbon meterial by the carbonization of Polyaniline-Prussian blue composite (PANI-PB). PANI-PB was first prepared by doping polyaniline with ferrous ion and ferricyanide ion in turn. The composite was then carbonized in a nitrogen atmosphere at a heating rate of 10°C min−1 up to a maximum temperature of 800°C, forming a Fe-N doped carbon meterial (Fe-N/C). The product demonstrates a unique graphitized structure and has a relatively high Fe-N doping amount. The cyclic voltammetry curves (CV) show that the composite can catalyze the ORR much more efficiently than either of the single materials containing only carbonized PANI or carbonized PB in alkaline media.

Los estilos APA, Harvard, Vancouver, ISO, etc.

27

Marimuthu, Alexander y Kannaiyan Pandian. "Electrochemical Detection of Hydrazine Using Cobalt Hexacynoferrate Deposited Carbon Sphere Modified Glassy Carbon Electrode". Advanced Materials Research 584 (octubre de 2012): 324–28. http://dx.doi.org/10.4028/www.scientific.net/amr.584.324.

Texto completo

Resumen

Cobalt hexacynoferrate decorated carbon spheres (CoHCF@C) with few micron dimensions was synthesized by sequential deposition method in which the carbon sphere previously modified with cobalt ion exposed into potassium ferricyanide. The thickness of the CoHCF layer was restricted to five cycles. The formation of layer CoHCF was confirmed by FT-IR, XRD, HRSEM, EDX and cyclic voltammeter technique. The CoHCF decorated carbon sphere modified GCE was utilized as electron transfer mediator for electrocatalytic oxidation of hydrazine in phosphate buffer medium. The electrocatalytic behavior of modified electrode on oxidation of hydrazine is compared with bare GCE. The amperometry method was adapted for the quantitative detection of hydrazine in water samples.

Los estilos APA, Harvard, Vancouver, ISO, etc.

28

Petrovic, Steven. "Cyclic Voltammetry of Hexachloroiridate(IV): An Alternative to the Electrochemical Study of the Ferricyanide Ion". Chemical Educator 5, n.º 5 (octubre de 2000): 231–35. http://dx.doi.org/10.1007/s00897000416a.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

29

Szánto, D. A., S. Cleghorn, C. Ponce-de-León y F. C. Walsh. "The limiting current for reduction of ferricyanide ion at nickel: The importance of experimental conditions". AIChE Journal 54, n.º 3 (2008): 802–10. http://dx.doi.org/10.1002/aic.11420.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

30

Rabai, Gyula, Akiko Kaminaga y Ichiro Hanazaki. "The Role of the Dushman Reaction and the Ferricyanide Ion in the Oscillatory IO3--SO32--Fe(CN)64- Reaction". Journal of Physical Chemistry 99, n.º 24 (junio de 1995): 9795–800. http://dx.doi.org/10.1021/j100024a021.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

31

Zhang, Du, Wang, Zhao y Zhou. "Determination of Iron Valence States Around Pits and the Influence of Fe3+ on the Pitting Corrosion of 304 Stainless Steel". Materials 13, n.º 3 (5 de febrero de 2020): 726. http://dx.doi.org/10.3390/ma13030726.

Texto completo

Resumen

Potassium ferricyanide and potassium ferrocyanide were used to observe and monitor the pitting corrosion of 304 stainless steel (SS) at anodic polarization in situ. The results show that there are Fe3+ ions around the corrosion pit when pitting occurs on 304 SS in NaCl aqueous solution. The effect of Fe3+ surrounded pits on the pitting corrosion was also studied by testing the electrochemical behavior of 304 SS in different Fe3+/Fe2+ solutions. The presence of Fe3+ leads to the positive shift of corrosion potential and the increase of corrosion rate of 304 SS. There are two possible reasons for this phenomenon. On the one hand, Fe3+ hydrolysis results in the decrease of pH value of solution. At the same iron ion concentration, the higher the Fe3+ ion concentration, the lower the solution pH value. On the other hand, Fe3+ may reduce on the electrode surface. The decrease of solution pH and the reduction of Fe3+ resulted in the acceleration of the corrosion rate.

Los estilos APA, Harvard, Vancouver, ISO, etc.

32

d’Agostino, Chiara, Andre Dejam, Mildred Pelletier, Nathawut Sibmooh, Fabiola Rizzatti y Alan N. Schechter. "Nitrite Ion Fluxes in Human Erythocytes." Blood 106, n.º 11 (16 de noviembre de 2005): 3731. http://dx.doi.org/10.1182/blood.v106.11.3731.3731.

Texto completo

Resumen

Abstract Our recent studies suggest that nitrite ions serve as a storage pool of nitric oxide (NO•) bioactivity, with reduction of nitrite to NO• within red blood cells (RBC), thus potentially explaining endocrine effects of NO•. We have investigated nitrite uptake and decay in human RBC using recently described methodologies based on assaying after stabilization of nitrite to reaction with hemoglobin by treatment with ferricyanide and quantificating by reductive chemiluminescence. Uptake of nitrite added to whole blood is very rapid (sec) and independent of temperature (from 4°C to 37°C) and state of oxygenation of the cells, or treatment with carbon monoxide. We obtain intracellular values as high as 711 ± 45.44 nM/l with an extracellular value of 10,935.089 ± 897.370 nM/l. Decay of nitrite levels within the RBC is, however, strongly temperature and ligand dependent. At 37°C only 22% of the original maximal value remains at 30 minutes (half life: 5.24 min), while there is no apparent decay at 4°C. Carbon monoxide also prevents nitrite destruction. If the nitrite-containing RBC are suspended in nitrite-free plasma, decay of nitrite levels is faster (half life 2.1min) suggesting export of nitrite as well as reaction with hemoglobin. We have also observed whole blood and RBC artery-to-vein gradients of nitrite levels in human forearm circulation suggesting rapid loss during RBC transit of the microcirculation. These results suggest rapid fluxes of nitrite ions into and out of RBC, as well as controlled intra-erythrocytic metabolism, which could contribute to local, rapid modulation of blood flow by mechanisms involving nitrite activation to NO• by intra-erythrocytic hemoglobin.

Los estilos APA, Harvard, Vancouver, ISO, etc.

33

Maeda, K., K. Truscott, X. L. Liu y R. K. Scopes. "A thermostable NADH oxidase from anaerobic extreme thermophiles". Biochemical Journal 284, n.º 2 (1 de junio de 1992): 551–55. http://dx.doi.org/10.1042/bj2840551.

Texto completo

Resumen

A high-abundance NADH-oxidizing enzyme (NADH: acceptor oxidoreductase, EC 1.6.99.3) has been identified and isolated from a range of anaerobic extreme thermophiles, including strains of Clostridium thermohydrosulfuricum and Thermoanaerobium brockii. By use of a pseudo-affinity salt-promoted adsorbent, a nearly pure sample was obtained in one step; remaining impurities were separated by ion-exchange. The fully active purified enzyme contains FAD (two molecules per subunit of 75-78 kDa) and iron-sulphur, and is hexameric in its most active form. The reaction with oxygen is a one- or two-electron transfer to produce superoxide radical and H2O2; other acceptors include tetrazolium salts, dichlorophenol-indophenol, menadione and ferricyanide. The role of the enzyme is not clear; it was found not to be NAD:ferredoxin oxidoreductase, which is a major NADH-utilizing enzyme in these organisms.

Los estilos APA, Harvard, Vancouver, ISO, etc.

34

UEMATSU, Kohei, Takaaki UENO y Hajime KATANO. "Effect of ε-Poly-L-lysine on a Glucose Sensor Based on Glucose Oxidase and Ferricyanide Ion". Analytical Sciences 34, n.º 8 (10 de agosto de 2018): 947–51. http://dx.doi.org/10.2116/analsci.18p114.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

35

Wierzchowski, Jacek, Danuta Slawinska y Janusz Slawinski. "Carbonate and Superoxide Ion-Radicals as Intermediates in the Chemiluminescence of the Ferricyanide — Hydrogen Peroxide Redox System". Zeitschrift für Physikalische Chemie 148, n.º 2 (enero de 1986): 197–214. http://dx.doi.org/10.1524/zpch.1986.148.2.197.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

36

Chong, Shaokun, Yuanzhen Chen, Yang Zheng, Qiang Tan, Chengyong Shu, Yongning Liu y Zaiping Guo. "Potassium ferrous ferricyanide nanoparticles as a high capacity and ultralong life cathode material for nonaqueous potassium-ion batteries". Journal of Materials Chemistry A 5, n.º 43 (2017): 22465–71. http://dx.doi.org/10.1039/c7ta08139a.

Texto completo

Resumen

KFe^II[Fe^III(CN)₆] with a symmetric cubic structure exhibits exceptional electrochemical performance based on a solid solution mechanism, and its high structural stability and electrochemical reversibility.

Los estilos APA, Harvard, Vancouver, ISO, etc.

37

Oshikiri, Yoshinobu, Makoto Miura y Ryoichi Aogaki. "Buoyancy Effect of Ionic Vacancy on the Change of the Partial Molar Volume in Ferricyanide-Ferrocyanide Redox Reaction under a Vertical Gravity Field". International Journal of Electrochemistry 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/610310.

Texto completo

Resumen

With a gravity electrode (GE) in a vertical gravity field, the buoyancy effect of ionic vacancy on the change of the partial molar volume in the redox reaction between ferricyanide (FERRI) and ferrocyanide (FERRO) ions was examined. The buoyancy force of ionic vacancy takes a positive or negative value, depending on whether the rate-determining step is the production or extinction of the vacancy. Though the upward convection over an upward electrode in the FERRO ion oxidation suggests the contribution of the positive buoyancy force arising from the vacancy production, the partial molar volume of the vacancy was not measured. On the other hand, for the downward convection under a downward electrode in the FERRI ion reduction, it was not completely but partly measured by the contribution of the negative buoyancy force from the vacancy extinction. Since the lifetime of the vacancy is decreased by the collision between ionic vacancies during the convection, the former result was ascribed to the shortened lifetime due to the increasing collision efficiency in the enhanced upward convection over an upward electrode, whereas the latter was thought to arise from the elongated lifetime due to the decreasing collision efficiency by the stagnation under the downward electrode.

Los estilos APA, Harvard, Vancouver, ISO, etc.

38

Masi, Sabrina Di, Antonio Pennetta y Cosimino Malitesta. "Preliminary Study on Electrochemical Ion Imprinted Polymeric Film in Sensor Development for Cd(II) Ions Determination in Water". Proceedings 60, n.º 1 (2 de noviembre de 2020): 39. http://dx.doi.org/10.3390/iecb2020-07037.

Texto completo

Resumen

Preliminary results on an electrosynthesized ion imprinted polymeric film (IIP-film) for Cd(II) ions determination in sensor development are here reported. The sensor was prepared by electropolymerization of 4-aminophenylacetic acid (4-APA) monomer in presence of Cd(II) ions, which acts as the template. The screen-printed carbon electrodes (SPCE) were used as transducer during sensor development, whereas the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were selected as the electrochemical methods for the synthesis and Cd(II) ions sensing, respectively. The incubation of the developed sensor in NaOH 250 mM involved into remove the template and the formation of specific recognition cavities into the polymer. A multivariate optimization based on central composite design (CCD) was employed to study the effect of three independent parameters on electrochemical performances of the sensor. The electrochemical characterization of sensors was performed in ferrocyanide-ferricyanide redox couple and in KCl 0.1 M, the latter revealing redox properties from the polymeric film. The performances of sensors and the control (non-imprinted film, NIP) was observed in sodium acetate buffer (100 mM, pH = 5) over the Cd(II) concentration range 0.1–10 µM.

Los estilos APA, Harvard, Vancouver, ISO, etc.

39

Shohibuddin, Ihda Uswatun Shalihah y Wan Wardatul Amani Wan Salim. "Tailoring the Electrochemical and Morphological Properties of Electropolymerized and Dropcast Reduced Graphene Oxide-Poly(3,4-ethylene dioxythiophene):polystyrenesulfonate Transducers for Ion-Selective Sensors". Proceedings 60, n.º 1 (2 de noviembre de 2020): 11. http://dx.doi.org/10.3390/iecb2020-07058.

Texto completo

Resumen

Fabrication of ion-selective sensors for continuous measurement in fluids depends on understanding the electrochemical and morphological properties of transducers. Electropolymerized nanomaterials essentially offer stable transducers that can reduce measurement drifts. This study aims to elucidate the electrochemical and morphological characteristics of electropolymerized reduced graphene oxide stabilized in polystyrenesulfonate and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate composites on screen-printed carbon electrodes (rGO:PSS-PEDOT:PSS/SPCEs) using scanning electron microscopy (SEM) and cyclic voltammetry (CV) in 0.1 M potassium ferricyanide (K3Fe(CN)6) solution. We fabricated the rGO:PSS-PEDOT:PSS/SPCEs by two different techniques: electropolymerization deposition (EPD) and drop-casting (DC). Results revealed smaller peak-to-peak potential separation (∆Ep) of 360 mV for EPD rGO:PSS-PEDOT:PSS/SPCEs, compared to 510 mV for the DC rGO:PSS-PEDOT:PSS/SPCEs. A smaller ∆Ep indicates higher reversibility and faster electron-transfer rate at the electrode-analyte interface. SEM results showed EPD rGO:PSS-PEDOT:PSS/SPCEs have the roughest surface among electrodes; homogeneous globular structures with diameter range of 1.4–5.3 µm covered the electrode surface. In terms of electrode integrity in fluids, cracks can be seen on the surface of DC PEDOT:PSS/SPCEs after undergoing CV in 0.1 M K3Fe(CN)6, whereas rGO:PSS-PEDOT:PSS/SPCEs for both deposition methods maintained their integrity. Globular structures of rGO:PSS-PEDOT:PSS using EPD methods remained after undergoing CV. The results suggest that EPD serves as a potential method to fabricate a stable transducer for ion-selective sensing. This study aims to elucidate performance of nanocomposites via EPD methods, to develop stable ion-selective sensors for physiological and environmental applications.

Los estilos APA, Harvard, Vancouver, ISO, etc.

40

BASU, Piku, Bettina KATTERLE, K. Kristoffer ANDERSSON y Howard DALTON. "The membrane-associated form of methane mono-oxygenase from Methylococcus capsulatus (Bath) is a copper/iron protein". Biochemical Journal 369, n.º 2 (15 de enero de 2003): 417–27. http://dx.doi.org/10.1042/bj20020823.

Texto completo

Resumen

A protocol has been developed which permits the purification of a membrane-associated methane-oxidizing complex from Methylococcus capsulatus (Bath). This complex has 5 fold higher specific activity than any purified particulate methane mono-oxygenase (pMMO) previously reported from M. capsulatus (Bath). This efficiently functioning methane-oxidizing complex consists of the pMMO hydroxylase (pMMOH) and an unidentified component we have assigned as a potential pMMO reductase (pMMOR). The complex was isolated by solubilizing intracytoplasmic membrane preparations containing the high yields of active membrane-bound pMMO (pMMOm), using the non-ionic detergent dodecyl-β-d-maltoside, to yield solubilized enzyme (pMMOs). Further purification gave rise to an active complex (pMMOc) that could be resolved (at low levels) by ion-exchange chromatography into two components, the pMMOH (47, 27 and 24kDa subunits) and the pMMOR (63 and 8kDa subunits). The purified complex contains two copper atoms and one non-haem iron atom/mol of enzyme. EPR spectra of preparations grown with 63Cu indicated that the copper ion interacted with three or four nitrogenic ligands. These EPR data, in conjunction with other experimental results, including the oxidation by ferricyanide, EDTA treatment to remove copper and re-addition of copper to the depleted protein, verified the essential role of copper in enzyme catalysis and indicated the implausibility of copper existing as a trinuclear cluster. The EPR measurements also demonstrated the presence of a tightly bound mononuclear Fe3+ ion in an octahedral environment that may well be exchange-coupled to another paramagnetic species.

Los estilos APA, Harvard, Vancouver, ISO, etc.

41

Chen, Cheng-Chuan, Shu-Cheng Lo y Pei-Kuen Wei. "Combination of Capped Gold Nanoslit Array and Electrochemistry for Sensitive Aqueous Mercuric Ions Detection". Nanomaterials 12, n.º 1 (29 de diciembre de 2021): 88. http://dx.doi.org/10.3390/nano12010088.

Texto completo

Resumen

Label-free surface plasmon resonance (SPR) detection of mercuric ions in various aqueous solutions, using capped gold nanoslit arrays combined with electrochemical (EC) sensing technique, is demonstrated. The nanoslit arrays are fabricated on flexible cyclo-olefin polymer substrates by a nanoimprinting lithography method. The EC and SPR signals for the investigation of current responses and transmission SPR spectra are simultaneously measured during metal ions electrodeposition. Glycerol–water solution is studied to evaluate the resonant peak wavelength sensitivity (480.3 nm RIU−1) with a FOM of 40.0 RIU−1 and the obtained intensity sensitivity is 1819.9%. The ferrocyanide/ferricyanide redox couple performs the diffusion controlled electrochemical processes (R2 = 0.99). By investigating the SPR intensity changes and wavelength shifts of various mercuric ion concentrations, the optical properties are evaluated under chronoamperometric conditions. The sensors are evaluated in the detection range between 100 μM and 10 nM with a detection limit of 1 μM. The time dependence of SPR signals and the selectivity of 10 μM Hg2+ in the presence of 10 μM interfering metal ion species from Ca2+, Co2+, Ni2+, Na+, Cu2+, Pb2 + and Mn2+ are determined. The capped gold nanoslit arrays show the selectivity of Hg2+ and the EC sensing method is effectively utilized to aqueous Hg2+ detection. This study provides a label-free detection technique of mercuric ions and this developed system is potentially applicable to detecting chemicals and biomolecules.

Los estilos APA, Harvard, Vancouver, ISO, etc.

42

Denger, Karin, Theo H. M. Smits y Alasdair M. Cook. "L-Cysteate sulpho-lyase, a widespread pyridoxal 5′-phosphate-coupled desulphonative enzyme purified from Silicibacter pomeroyi DSS-3T". Biochemical Journal 394, n.º 3 (24 de febrero de 2006): 657–64. http://dx.doi.org/10.1042/bj20051311.

Texto completo

Resumen

Quantitative utilization of L-cysteate (2-amino-3-sulphopropionate) as the sole source of carbon and energy for growth of the aerobic, marine bacterium Silicibacter pomeroyi DSS-3T was observed. The sulphonate moiety was recovered in the medium largely as sulphite, and the appropriate amount of the ammonium ion was also observed. Genes [suyAB (3-sulpholactate sulpho-lyase)] encoding the known desulphonation reaction in cysteate degradation were absent from the genome, but a homologue of a putative sulphate exporter gene (suyZ) was found, and its neighbour, annotated as a D-cysteine desulphhydrase, was postulated to encode pyridoxal 5′-phosphate-coupled L-cysteate sulpho-lyase (CuyA), a novel enzyme. Inducible CuyA was detected in cysteate-grown cells. The enzyme released equimolar pyruvate, sulphite and the ammonium ion from L-cysteate and was purified to homogeneity by anion-exchange, hydrophobic-interaction and gel-filtration chromatography. The N-terminal amino acid sequence of this 39-kDa subunit confirmed the identification of the cuyA gene. The native enzyme was soluble and homomultimeric. The Km-value for L-cysteate was high (11.7 mM) and the enzyme also catalysed the D-cysteine desulphhydrase reaction. The gene cuyZ, encoding the putative sulphite exporter, was co-transcribed with cuyA. Sulphite was exported despite the presence of a ferricyanide-coupled sulphite dehydrogenase. CuyA was found in many bacteria that utilize cysteate.

Los estilos APA, Harvard, Vancouver, ISO, etc.

43

UEMATSU, Kohei, Misato YAMASAKI, Takao HIBI y Hajime KATANO. "Promotion Effect by ^|^epsilon;-Poly-L-lysine on the Enzymatic Reaction of Glucose Oxidase with Ferricyanide Ion as an Oxidant". Analytical Sciences 28, n.º 7 (2012): 657–60. http://dx.doi.org/10.2116/analsci.28.657.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

44

DiTucci, Matthew J., Sven Heiles y Evan R. Williams. "Role of Water in Stabilizing Ferricyanide Trianion and Ion-Induced Effects to the Hydrogen-Bonding Water Network at Long Distance". Journal of the American Chemical Society 137, n.º 4 (26 de enero de 2015): 1650–57. http://dx.doi.org/10.1021/ja5119545.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

45

Abdolmohammad-Zadeh, Hossein y Elaheh Rahimpour. "A novel chemosensor based on graphitic carbon nitride quantum dots and potassium ferricyanide chemiluminescence system for Hg(II) ion detection". Sensors and Actuators B: Chemical 225 (marzo de 2016): 258–66. http://dx.doi.org/10.1016/j.snb.2015.11.052.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

46

Li, Wanfeng, Fang Zhang, Xingde Xiang y Xiucheng Zhang. "High-Efficiency Na-Storage Performance of a Nickel-Based Ferricyanide Cathode in High-Concentration Electrolytes for Aqueous Sodium-Ion Batteries". ChemElectroChem 4, n.º 11 (15 de agosto de 2017): 2870–76. http://dx.doi.org/10.1002/celc.201700776.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

47

Melato, Ana I. y Luisa M. Abrantes. "Electrochemical behavior of poly(3,4-ethylenedioxy)thiophene doped with hexacyanoferrate anions in different electrolyte media". Collection of Czechoslovak Chemical Communications 74, n.º 11-12 (2009): 1791–805. http://dx.doi.org/10.1135/cccc2009114.

Texto completo

Resumen

This paper describes in detail the electrochemical properties of potentiodynamically synthesized poly(3,4-ethylenedioxy)thiophene (PEDOTh) modified by the entrapment of hexacyanoferrate anions (Fe(CN)63–). Cyclic voltammetric data clearly shows that during polymer redox conversion/immobilized anion reduction and re-oxidation, charge compensation occurs at the expenses of the insertion–deinsertion of appropriate cations from solution. In aqueous electrolyte mainly protons are involved whereas in organic media the process requires small highly mobile ions such as lithium. PEDOTh/Pt and PEDOTh/Fe(CN)63–/Pt have been used for the detection of ascorbic acid (AA) in mixed medium (0.1 M TBAPF6 in acetonitrile + 8% H2O). Compared to that of bare platinum electrode, the analyte oxidation peak potential occurs at significant less positive values at both modified electrodes, revealing their good electrocatalytic activity. For the polymer incorporating ferricyanide ion, the observed decrease in the AA oxidation onset potential along with the fading away of Fe(CN)63– reduction signal, supports a mechanism taking into account the mediator character of the embedded anion.

Los estilos APA, Harvard, Vancouver, ISO, etc.

48

Ghimire, Basanta, Nawraj Sapkota, Herbert Behlow, Sriparna Bhattacharya, Morteza Sabet, Abha Misra y Apparao M. Rao. "Waste Heat Driven Microporous-Carbon-Based Thermo-Electrochemical Cells". ECS Meeting Abstracts MA2022-02, n.º 1 (9 de octubre de 2022): 1. http://dx.doi.org/10.1149/ma2022-0211mtgabs.

Texto completo

Resumen

Solid-state thermoelectrics have focused on thermal to electrical energy conversion for many decades. Nevertheless, the thermoelectric energy conversion efficiency is limited by the intrinsic coupling between material properties such as electrical conductivity and the Seebeck coefficient, which reduces its efficiency despite much progress in this field. Here, we demonstrate a simple, cost-effective platform for harvesting waste heat into electricity via thermo-electrochemical cells (or thermocells) that utilize the effect of temperature on electrochemical redox potentials (i.e., the electrochemical Seebeck effect). In our preliminary experiments, coin cell type thermocells were prepared using microstructured carbon electrodes, aqueous ferricyanide/ferrocyanide redox couple, and commercial polymer separators. The wettability of the electrodes was varied by changing the duration of reactive ion etching (RIE), which improved the power performance. The highest output power (~ 75 nW) was recorded for RIE time of 3 minutes with a load of 1 kΩ. Separately, we also tested thermocells using natural wood-derived cellulose as separator materials. The performance of our thermocells will be presented, and their ability to directly power small electronic devices will be discussed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

49

Noguchi, Takio y Jun-ichi Anzai. "Redox Properties of the Ferricyanide Ion on Electrodes Coated with Layer-by-Layer Thin Films Composed of Polysaccharide and Poly(allylamine)". Langmuir 22, n.º 6 (marzo de 2006): 2870–75. http://dx.doi.org/10.1021/la053226u.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

50

Chen, Hailing, Tingxiu Ye, Bin Qiu, Guonan Chen y Xi Chen. "A novel approach based on ferricyanide-mediator immobilized in an ion-exchangeable biosensing film for the determination of biochemical oxygen demand". Analytica Chimica Acta 612, n.º 1 (marzo de 2008): 75–82. http://dx.doi.org/10.1016/j.aca.2008.02.006.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Artículos de revistas sobre el tema "Ferricyanide ion"

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros