Alginate electrodeposition onto three-dimensional porous Co-Ni films as drug delivery platforms

Three-dimensional porous Co–Ni films/alginate hybrid materials have been successfully prepared by electrodeposition to be used as a steerable magnetic device for drug delivery. Firstly, 3D porous Co–Ni films were prepared as substrates for the subsequent electrodeposition of the alginate biopolymer. Cyclic voltammetry, galvanostatic and potentiostatic studies were performed to establish the best conditions to obtain porous Co–Ni films. The electrochemical experiments were carried out in an electrolyte containing the metal salts and ammonium chloride at low pHs. In a second stage, the electrochemical deposition of alginate as a biocompatible polymer drug delivery carrier was performed. The characteristics of the alginate matrix were investigated in terms of electrochemical properties, morphology and drug release. The hybrid material obtained showed soft-magnetic behavior and drug release indicating its suitability to be used as a steerable magnetic drug delivery device.Postprint (author's final draft

Determining kinetic constants and transport efficiencies at membrane interfaces to optimize the removal/recovery of Cu(II) through lulk liquid membranes containing benzoylacetone as carrier

The removal, separation, and enrichment of heavy metals in aqueous solutions has become a prime concern over the last few decades because of both their adverse effects on the ecosystem and living organisms and their valuable resource character. This paper describes a study to optimize the simultaneous removal/ recovery of Cu(II) from aqueous solutions by bulk liquid membranes, through a facilitated countertransport mechanism using benzoylacetone as a mobile carrier and hydrochloric acid as a stripping agent (protons as counter ions), by analyzing the effect of different operational variables (carrier concentration in membrane phase, stripping agent concentration in product phase, stirring rate, and membrane phase volume) on the removal/recovery kinetics constants and on the transport efficiencies through the feed/membrane and membrane/product interfaces.We would like to thank Mr. A. Guzmán and Mr. J.A. López for manufacturing the experimental cell

Platinum Electrodeposition in an Ionic Liquid Analogue. Solvent Stability Monitoring

The use of ionic liquid analogues as solvents has increased in order to substitute the aqueous solvents in some applications in which the side reactions are undesirable. However these solvents prepared from the mixture in the eutectic proportion of species establishing hydrogen bonds are susceptible of electrochemical reactions. The study of platinum deposition on vitreous carbon in an ionic liquid analogue (2 urea: choli ne chloride) is presented; the electrochemical study has permitted to interpret the sequence of the metal deposition process and simultaneously to analyze the behavior of the ionic liquid analogue along the process. Reduction reactions of the solvent relat ed both to the electronation of choline and hydrogen formation have been detected. Different substrata have been used in order to test the possibility and the extent of these reactions depending on the nature of material. The results indicate that the feas ible electrochemical window of the substrate/solvent is highly dependent of the kind of substrate; the negative limit is tied by the massive hydrogen reaction, reaction enhanced by the electrocatalytic character of the substrate

p-Filiform Zinbiel algebras

The paper deals with the classification of a subclass of finite-dimensional Zinbiel algebras: the naturally graded p-filiform Zinbiel algebras. A Zinbiel algebra is the dual to Leibniz algebra in Koszul sense. We prove that there exists, up to isomorphism, only one family of naturally graded p-filiform Zinbiel algebras under hypothesis n − p 4

Diseño y construcción de una máquina interactiva que ilustre la formación de las dunas en el desierto para el Parque Interactivo Explora

En este proyecto se muestra el desarrollo de una máquina interactiva para la sala Colombia Geodiversa del Parque Explora, teniendo en cuenta el fenómeno geomorfológico de la formación de las dunas en el desierto -- Este proyecto surgió con el objetivo de desarrollar una máquina interactiva que ilustre de manera lúdica el fenómeno de la formación de las dunas -- La experiencia estará dirigida a los usuarios de museos interactivos entre los 10 y 17años de edad -- Dunar es la máquina que ilustra la formación de Las DUNAS, mostrando el resultado de una gran acumulación de arena, presentando ondulaciones producidas por la interacción de elementos naturales como la corriente costera, el oleaje y el viento, creando así diferentes tipos de DUNAS como: Duna Lateral -- Duna de Estela -- Duna Transversal -- “Dunar” como su nombre lo indica nace de la palabra dunas, las cuales se refieren a comunidades vegetales y plantas que prosperan en los suelos arenosos móviles de las dunas a las cuales ayudan a fijar -- En nuestros territorios, tales montículos de arena movidos por el viento existen más que todo en las playas y en zonas litorales -- Este fenómeno genera en las personas atracción por el enigma que la palabra produce y crea expectativa acerca de la explicación de dicho fenómeno -- La finalidad del proyecto es diseñar y fabricar un modelo funcional, con un alto nivel de exigencia en la calidad y el diseño, logrando captar la atención del usuario, permitiendo que se divierta y transmitiendo conocimiento mediante la interacción del usuario con la experiencia acerca de los desiertos colombianos y lo que allí ocurre -- El desarrollo de este modelo surgió de la necesidad del proyecto que desarrolla la Universidad EAFIT junto con el Parque EXPLORA para desarrollar experiencias para el museo que expliquen fenómenos naturale

Quasi-filiform Leibniz algebras of maximum length

The n-dimensional p-filiform Leibniz algebras of maximum length have already been studied with 0 p 2. For Lie algebras whose nilindex is equal to n − 2 there is only one characteristic sequence, (n − 2, 1, 1), while in Leibniz theory we obtain two possibilities: (n−2, 1, 1) and (n−2, 2). The first case (the 2-filiform case) is already known. The present paper deals with the second case, i.e., quasi-filiform non Lie Leibniz algebras of maximum length. Therefore this work completes the study of maximum length of Leibniz algebras with nilindex n − p with 0 p 2.Junta de Andalucía FQM-14

3-filiform Leibniz algebras of maximum length

This work completes the study of the solvable Leibniz algebras, more precisely, it completes the classi cation of the 3- liform Leibniz algebras of maximum length [4]. Moreover, due to the good structure of the algebras of maximum length, we also tackle some of their cohomological properties. Our main tools are the previous result of Cabezas and Pastor [3], the construction of appropriate homogeneous basis in the considered connected gradation and the computational support provided by the two programs implemented in the software Mathematica.Ministerio de Economía y Competitividad MTM2013–43687–