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Begoña Ferrari

Other affiliations: Lucideon
Bio: Begoña Ferrari is an academic researcher from Spanish National Research Council. The author has contributed to research in topics: Electrophoretic deposition & Ceramic. The author has an hindex of 24, co-authored 127 publications receiving 2053 citations. Previous affiliations of Begoña Ferrari include Lucideon.


Papers
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TL;DR: The colloidal approach has been studied as an essential step in the tailoring of ceramic nanostructures, but most colloidal processes are limited by the complexity of preparation of highly concentrated and stable suspensions of nanoparticles and their fast ageing as mentioned in this paper.
Abstract: The colloidal approach has been studied as an essential step in the tailoring of ceramic nanostructures, but most colloidal processes are limited by the complexity of preparation of highly concentrated and stable suspensions of nanoparticles and their fast ageing. Electrophoretic deposition (EPD) stands out as the most appropriate colloidal process to produce ceramic structures using low solid content sols and suspensions (

233 citations

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TL;DR: In this article, the synthesis conditions were modified varying the molar ratio of water/TEOS, NH 3 /TEOS and amount of CTAB, and the results showed that the specific surface area and the porosity of silica particles were strongly affected by the addition of cetyltrimethylammonium bromide (CTAB) and the amount of H 2 O.
Abstract: Development of mesoporous silica nanoparticles as carriers for drug delivery systems has increased exponentially during the last decade. The present work is focused on the synthesis of silica carriers by sol–gel from tetraethyl orthosilicate (TEOS) as precursor of silica and cetyltrimethylammonium bromide (CTAB) as pore generating agent. The synthesis conditions were modified varying the molar ratio of water/TEOS, NH 3 /TEOS and amount of CTAB. The silica particles were characterized by scan electron microscopy techniques (FESEM), high resolution transmission electron microscopy (HR-TEM), N 2 adsorption–desorption isotherms, Zeta-potential and Dynamic Light Scattering (DLS). The results show that the specific surface area and the porosity of silica particles were strongly affected by the addition of CTAB and the amount of H 2 O. The dispersion and stability of silica mesoporous particles is achieved in spite of the high surface reactivity. The synthesis formulation affects considerably to the particle morphology, which changes from spheres to rods when the molar ratio of H 2 O increases. A maximum specific surface area of 1480 m 2 /g was obtained with pore sizes ranging 2.5–2.8 nm.

134 citations

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TL;DR: In this article, aqueous alumina slip on a graphite electrode is characterized in terms of viscosity, zeta potential and conductivity, and the best conditions for obtaining uniform and dense coatings are 6.4 mA cm −2 for up to 10 min.
Abstract: Electrophoretic deposition (EPD) of aqueous alumina slips on a graphite electrode is studied. The suspension is characterized in terms of viscosity, zeta potential and conductivity. The conductivity has proved to be a determining parameter for obtaining deposits. Well-dispersed slips having an adequate value of conductivity are used for constant current density experiments. Current densities of 1.6 to 12.8 mA cm −2 are applied for 10 min. After defining the optimal slip properties for the deposition, both the process development and the final properties of the materials obtained depend on the current/time relationship. Alumina deposits obtained at different current densities are characterized. The best conditions for obtaining uniform and dense coatings are 6.4 mA cm −2 for up to 10 min. The applied current allows not only to modify the properties and microstructure of the deposit, but also to increase the margin of slip conductivity assuring the success of the EPD process, that is, the working conditions.

117 citations

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TL;DR: In this article, the preparation of thin sol-gel coating by electrophoretic deposition (EPD) is studied, where commercial SiO2 nanoparticles are suspended in an acid-catalysed sol, whose stability is largely increased by adding tetramethylammonium hydroxide (TMAH) up to pH 6.
Abstract: Sol–gel technology allows the production of hybrid coatings on metals using low temperatures for densification, but has an important limitation related with the maximum coating thickness attainable, typically lower than 2 μm. The incorporation of nano-particles to the sol can make it possible to increase the coating thickness, without increasing the sintering temperature. This work deals with the preparation of thick sol–gel coating by electrophoretic deposition (EPD). Commercial SiO2 nanoparticles are suspended in an acid-catalysed SiO2 sol, whose stability is largely increased by adding tetramethylammonium hydroxide (TMAH) up to pH 6. Coatings are formed by dipping and by EPD on AISI 304 stainless steel substrates. The protective behaviour against corrosion in aggressive media (i.e. marine water) of the produced films is studied. EPD leads to coatings as thick as 5 μm with good corrosion resistance, while the suspension stability is increased by 15 times compared with that of the starting acid suspension.

70 citations

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TL;DR: In vitro behavior of PLA/Mg films demonstrated that Mg2+ ions increase the fibroblast cells growth and opens a window of opportunity for these composite films as bioabsorbable material for tissue engineering and wound dressing applications.

60 citations


Cited by
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TL;DR: In this article, a review of the fundamental aspects of electrophoretic deposition technique, factors influencing the deposition process, kinetic aspects, types of EPD, the driving forces, preconditioning electrophoreic suspension, stability and control of suspension, mechanisms involved in EPD and drying of deposits obtained by EPD are discussed.

1,827 citations

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1,682 citations

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TL;DR: In this article, a review of the recent developments and applications of sol-gel corrosion protection coatings on different metal substrates, such as steel, aluminum, copper, magnesium and their alloys, is presented.

924 citations

Journal ArticleDOI
TL;DR: In this paper, Belitz et al. presented a survey of the state-of-the-art in condensed-matter physics, focusing on the following papers: Condensed Matter Physics (Theoretical) J. IGNACIO CIRAC, Max-Planck-Institut für Quantenoptik Quantum Information RAYMOND E. GOLDSTEIN, University of Cambridge Biological Physics ARTHUR F. HEBARD and DAVID D. KAMIEN.
Abstract: Associate DIETRICH BELITZ, University of Oregon Editors: Condensed Matter Physics (Theoretical) J. IGNACIO CIRAC, Max-Planck-Institut für Quantenoptik Quantum Information RAYMOND E. GOLDSTEIN, University of Cambridge Biological Physics ARTHUR F. HEBARD, University of Florida Condensed Matter Physics (Experimental) RANDALL D. KAMIEN, University of Pennsylvania Soft Condensed Matter DANIEL KLEPPNER, Massachusetts Institute of Technology Atomic, Molecular, and Optical Physics (Experimental) PAUL G. LANGACKER, Institute for Advanced Study, Princeton University Particle Physics (Theoretical) VERA LÜTH, Stanford University Particle Physics (Experimental) DAVID D. MEYERHOFER, University of Rochester Physics of Plasmas and Matter at High-Energy Density WITOLD NAZAREWICZ, University of Tennessee, Oak Ridge National Laboratory Nuclear Physics JOHN H. SCHWARZ, California Institute of Technology Mathematical Physics FRIEDRICH-KARL THIELEMANN, Universität Basel Astrophysics Senior Assistant Editor: DEBBIE BRODBAR, APS Editorial Office American Physical Society

774 citations

Journal ArticleDOI
TL;DR: In this article, a review of electrophoretic deposition of materials is presented, focusing on the relation between the evolution of the current and the electric field strength, and the kinetics of the process.
Abstract: ▪ Abstract The electrophoretic deposition of materials is reviewed. Numerous applications of electrophoretic deposition are described, including production of coatings, free-standing objects, and laminated or graded materials, infiltration of porous materials, and fabrication of woven fiber preforms. The preparation of electrophoretic suspensions is discussed as are a number of mechanisms of deposition that have been proposed elsewhere. In discussing the kinetics of the process, primary attention is given to the relation between the evolution of the current and the electric field strength.

746 citations