Nanostructured modified electrodes: Role of ions and solvent flux in redox active polyelectrolyte multilayer films

2006 ◽  
Vol 8 (43) ◽  
pp. 5086 ◽  
Author(s):  
Mario Tagliazucchi ◽  
Doris Grumelli ◽  
Ernesto J. Calvo
Keyword(s):  
Modified Electrodes ◽  
Multilayer Films ◽  
Polyelectrolyte Multilayer ◽  
Redox Active

Recent Progress in the Analysis of Captopril Using Electrochemical Methods: A Review

2019 ◽  
Vol 15 (3) ◽  
pp. 198-206 ◽  
Author(s):  
Sarfaraz Ahmed Mahesar ◽  
Saeed Ahmed Lakho ◽  
Syed Tufail Hussain Sherazi ◽  
Hamid Ali Kazi ◽  
Kamran Ahmed Abro ◽  
...  
Keyword(s):  
Enzyme Inhibitor ◽  
Modified Electrodes ◽  
High Sensitivity ◽  
Pharmaceutical Formulations ◽  
Inorganic Materials ◽  
Electrochemical Methods ◽  
Nano Particles ◽  
Moderate Heart Failure ◽  
Analytical Instrumentation

Background: Captopril is the synthetic dipeptide used as an angiotensin converting enzyme inhibitor. Captopril is used to treat hypertension as well as for the treatment of moderate heart failure. Analytical instrumentation and methodology plays an important role in pharmaceutical analysis. Methods: This review presents some important applications of electrochemical modes used for the analysis of captopril. So far captopril has been analyzed by using different bare and modified working electrodes with a variety of modifiers from organic and inorganic materials to various types of nano particles/materials. Results: This paper presents some of the methods which have been published in the last few years i.e. from 2003 to 2016. This review highlights the role of the analytical instrumentation, particularly electrochemical methods in assessing captopril using various working electrodes. Conclusion: A large number of studies on voltammetry noted by means of various bare and modified electrodes. Among all of the published voltammetric methods, DPV, SWV, CV and miscellaneous modes were trendy techniques used to analyze captopril in pharmaceutical formulations as well as biological samples. Electrodes modified with nanomaterials are promising sensing tools as this showed high sensitivity, good accuracy with precision as well as selectivity. In comparison to chromatographic methods, the main advantages of electrochemical methods are its cheaper instrumentation, lower detection limit and minimal or no sample preparation.

scholarly journals Green Nanocoatings Based on the Deposition of Zirconium Oxide: The Role of the Substrate

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1043
Author(s):  
Vitor Bonamigo Moreira ◽  
Anna Puiggalí-Jou ◽  
Emilio Jiménez-Piqué ◽  
Carlos Alemán ◽  
Alvaro Meneguzzi ◽  
...  
Keyword(s):  
Zirconium Oxide ◽  
Active Sites ◽  
Modified Electrodes ◽  
Chemical Conversion ◽  
Ceramic Materials ◽  
Point Of View ◽  
Oxide Coatings ◽  
Alloying Element ◽  
Substrate Nature

Herein, the influence of the substrate in the formation of zirconium oxide monolayer, from an aqueous hexafluorozirconic acid solution, by chemical conversion and by electro-assisted deposition, has been approached. The nanoscale dimensions of the ZrO2 film is affected by the substrate nature and roughness. This study evidenced that the mechanism of Zr-EAD is dependent on the potential applied and on the substrate composition, whereas conversion coating is uniquely dependent on the adsorption reaction time. The zirconium oxide based nanofilms were more homogenous in AA2024 substrates if compared to pure Al grade (AA1100). It was justified by the high content of Cu alloying element present in the grain boundaries of the latter. Such intermetallic active sites favor the obtaining of ZrO2 films, as demonstrated by XPS and AFM results. From a mechanistic point of view, the electrochemical reactions take place simultaneously with the conventional chemical conversion process driven by ions diffusion. Such findings will bring new perspectives for the generation of controlled oxide coatings in modified electrodes used, as for example, in the construction of battery cells; in automotive and in aerospace industries, to replace micrometric layers of zinc phosphate by light-weight zirconium oxide nanometric ones. This study is particularly addressed for the reduction of industrial waste by applying green bath solutions without the need of auxiliary compounds and using lightweight ceramic materials.

scholarly journals Recent Advances in the Use of Transition-Metal Porphyrin and Phthalocyanine Complexes as Electro-Catalyst Materials on Modified Electrodes for Electroanalytical Sensing Applications

Solids ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 212-231
Author(s):  
J. Antonio Cruz-Navarro ◽  
Fabiola Hernández-García ◽  
Luis Humberto Mendoza-Huizar ◽  
Verónica Salazar-Pereda ◽  
J. Ángel Cobos-Murcia ◽  
...  
Keyword(s):  
Transition Metal ◽  
Catalytic Properties ◽  
Modified Electrodes ◽  
Metal Porphyrin ◽  
Water Contaminants ◽  
Active Behavior ◽  
Sensing Applications ◽  
Redox Active ◽  
Innovative Materials ◽  
Solid Electrodes

Metalloporphyrins (MP) and metallophtalocyanines (MPc) are innovative materials with catalytic properties that have attracted attention for their application for diverse electrochemical purposes. The presence of metallic centers in their structure offers a redox-active behavior that is being applied in the design of solid electrodes for the quantification of biomolecules, water contaminants, and pharmaceuticals, among others. Herein, we collect the recent information about porphyrin and phthalocyanine complexes as modifiers of electrodes, and the important aspects of the design, characterization, and application of these electrodes.

Controlling the Growth Regime of Polyelectrolyte Multilayer Films:  Changing from Exponential to Linear Growth by Adjusting the Composition of Polyelectrolyte Mixtures

Langmuir ◽  
2004 ◽  
Vol 20 (5) ◽  
pp. 1980-1985 ◽  
Author(s):  
Eric Hübsch ◽  
Vincent Ball ◽  
Bernard Senger ◽  
Gero Decher ◽  
Jean-Claude Voegel ◽  
...  
Keyword(s):  
Linear Growth ◽  
Multilayer Films ◽  
Polyelectrolyte Multilayer ◽  
Growth Regime

scholarly journals Bombardment induced ion transport – part IV: ionic conductivity of ultra-thin polyelectrolyte multilayer films

2016 ◽  
Vol 18 (6) ◽  
pp. 4345-4351 ◽  
Author(s):  
Veronika Wesp ◽  
Matthias Hermann ◽  
Martin Schäfer ◽  
Jonas Hühn ◽  
Wolfgang J. Parak ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ion Transport ◽  
Multilayer Films ◽  
Low Energy ◽  
Ionic Conductance ◽  
Polyelectrolyte Multilayer ◽  
Transport Part

Low energy bombardment induced ion transport (BIIT) studies demonstrate that the ionic conductance of ultra-thin polyelectrolyte multilayer (PEM) films depends non-monotonically on the number of bilayers.

The role of cardiomyocyte Nox4D, a redox-active splice variant of NADPH oxidase-4

2018 ◽  
Vol 120 ◽  
pp. 20
Author(s):  
N. Savage ◽  
N. Anilkumar ◽  
E. Henckaerts ◽  
A.M. Shah
Keyword(s):  
Nadph Oxidase ◽  
Splice Variant ◽  
Nadph Oxidase 4 ◽  
Redox Active

scholarly journals Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Marc Michel ◽  
Valérie Toniazzo ◽  
David Ruch ◽  
Vincent Ball
Keyword(s):  
Short Review ◽  
Multilayer Films ◽  
Film Deposition ◽  
Layer By Layer ◽  
Operational Parameters ◽  
Polyelectrolyte Multilayer ◽  
Interacting Species ◽  
Growth Regime ◽  
Versatile Tool ◽  
Solid Liquid

The modification of solid-liquid interfaces with polyelectrolyte multilayer films appears as a versatile tool to confer new functionalities to surfaces in environmentally friendly conditions. Indeed such films are deposited by alternate dipping of the substrates in aqueous solutions containing the interacting species or spraying these solutions on the surface of the substrate. Spin coating is more and more used to produce similar films. The aim of this short review article is to provide an unifying picture about the deposition mechanisms of polyelectrolyte multilayer films. Often those films are described as growing either in a linear or in a supralinear growth regime with the number of deposited “layer pairs”. The growth regime of PEM films can be controlled by operational parameters like the temperature or the ionic strength of the used solutions. The control over the growth regime of the films as a function of the number of deposition steps allows to control their functional properties: either hard and impermeable films in the case of linear growth or soft and permeable films in the case of supralinear growth. Such different properties can be obtained with a given combination of interacting species by changing the operational parameters during the film deposition.

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