Electrochemical methods for template-assisted synthesis of nanostructured materials

Prida, V.M.; Vega, V.; Garcı́a, Javier; Iglesias, Lucía; Hernando, B.; Mínguez-Bacho, Ignacio

doi:10.1016/b978-0-08-100164-6.00001-1

Cited by 22 publications

(21 citation statements)

References 175 publications

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“…A highly ordered NPAM with hexagonally distributed pore arrangement was prepared by the two-step anodization of aluminum [ 10 , 29 ]. Firstly, high purity aluminum foil substrate (99.999%, Goodfellow, Huntingdon, England), with 0.5 mm in thickness and 25 × 25 mm 2 in area was cleaned by sonication for 5 min in isopropanol and ethanol and then rinsed with deionized water.…”

Section: Methodsmentioning

confidence: 99%

Morphological, Chemical Surface, and Diffusive Transport Characterizations of a Nanoporous Alumina Membrane

et al. 2015

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Synthesis of a nanoporous alumina membrane (NPAM) by the two-step anodization method and its morphological and chemical surface characterization by analyzing Scanning Electron Microscopy (SEM) micrographs and X-Ray Photoelectron Spectroscopy (XPS) spectra is reported. Influence of electrical and diffusive effects on the NaCl transport across the membrane nanopores is determined from salt diffusion measurements performed with a wide range of NaCl concentrations, which allows the estimation of characteristic electrochemical membrane parameters such as the NaCl diffusion coefficient and the concentration of fixed charges in the membrane, by using an appropriated model and the membrane geometrical parameters (porosity and pore length). These results indicate a reduction of ~70% in the value of the NaCl diffusion coefficient through the membrane pores with respect to solution. The transport number of ions in the membrane pores (Na+ and Cl−, respectively) were determined from concentration potential measurements, and the effect of concentration-polarization at the membrane surfaces was also considered by comparing concentration potential values obtained with stirred solutions (550 rpm) and without stirring. From both kinds of results, a value higher than 0.05 M NaCl for the feed solution seems to be necessary to neglect the contribution of electrical interactions in the diffusive transport.

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Section: Methodsmentioning

confidence: 99%

Morphological, Chemical Surface, and Diffusive Transport Characterizations of a Nanoporous Alumina Membrane

et al. 2015

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“…A 0.3 M solution of sulphuric acid at a constant anodization voltage of 25 V (Sf-NPAM membrane), or a 0.3 M solution of oxalic acid under an applied anodization voltage of 40 V (Ox-NPAM membrane), were respectively used for the first (and second) anodization processes, as it was extensively explained in ref. [15]. The duration of the first anodization step was fixed to 24 h in all the cases, in order to assure a high periodicity of nanopores self-ordering degree of NPAMs.…”

Section: Methodsmentioning

confidence: 99%

Influence of TiO2-Coating Layer on Nanoporous Alumina Membranes by ALD Technique

et al. 2018

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Geometrical, chemical, optical and ionic transport changes associated with ALD of TiO 2 -coating on the porous structure of two nanoporous alumina membranes (NPAMs), which were obtained by the two-step aluminum anodization method but with different pore size and porosity, are presented. Chemical and morphological changes were determined by analyzing XPS spectra and SEM images, showing practically total coverage of the NPAMs surface and leading to a reduction in the geometrical parameters of both samples, while SAED and high resolution TEM measurements allowed us to determine the crystalline structure and thickness of the TiO 2 -coating, with the latter confirmed by depth-profile XPS analysis. Spectroscopic ellipsometry measurements were also carried out in order to detect changes in characteristic optical parameters (refractive index, n, and extinction coefficient, k), due to the TiO 2 -coating of NPAMs. Considering the common application of NPAMs in solute/ion diffusion processes, the effect of the TiO 2 -coverage on electrochemical parameters was analyzed by measuring the concentration potential with a typical model electrolyte (KCl solutions), leading to an increase of the electropositive character for both kinds of samples.

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“…The non-stationary electrolysis using alternating current has been the focus of interest for many years. In the first line, it concerns the obtaining of compact metal galvanic coatings [1,2] or nanopore arrays used as templates for deposition of nanowires [3,4], but in the second line-also other industrial processes like water electrolysis [5,6] or metal refining (like copper [7,8]).…”

Section: Introductionmentioning

confidence: 99%

Methods to Determine the Current Efficiency in AC Electrolysis

et al. 2020

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The paper presents several methods (analytical, electromechanical and electronic) for determining the cathodic current efficiency of the metal deposition processes carried out by AC or pulse current. Based on the results of own experimental researches (for indium, cadmium, nickel, tin and zinc), the appropriate equations are given and the distribution of both faradaic and non-faradaic parts of charge (charging of the electrode double layer) is calculated.

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Electrochemical methods for template-assisted synthesis of nanostructured materials

Cited by 22 publications

References 175 publications

Morphological, Chemical Surface, and Diffusive Transport Characterizations of a Nanoporous Alumina Membrane

Morphological, Chemical Surface, and Diffusive Transport Characterizations of a Nanoporous Alumina Membrane

Influence of TiO2-Coating Layer on Nanoporous Alumina Membranes by ALD Technique

Methods to Determine the Current Efficiency in AC Electrolysis

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