Research Center en Quimica Aplicada
Research Center en Quimica Aplicada
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: NMP.2010.1.2-4 | Award Amount: 4.04M | Year: 2010
Silver nanoparticles and silver based nanostructured composites are being frequently used in a variety of biomedical and industrial applications, such as an antimicrobial agents, lead-free solders, electric contact materials, gas-sensitive sensor, etc. The most complicated Silver using problems are related to: i) recovery of silver from ore waste materials; ii) the controlled synthesis of metal nanoparticles of well-defined size, shape and composition; iii) nanoparticles incorporation to desired implant surfaces; iv) synthesis of Silver based nanostructured composites for industrial purposes. The main goal of the Project is to develop: 1. Clean and efficient procedure of silver recovery from waste: Combined Mechanical Activation Thermal Oxidation Processing jarosite type residues to alleviate and accelerate the following precious metal leaching; 2. Combined nanotechnology of biological synthesis (use of plants for the nanoparticles synthesis) of Ag nanoparticles and its deposition on implant surfaces by electrophoretic and plasma spraying deposition; 3. Nanostructuring technology of Silver based nanocomposites manufacturing for electrical contact applications. Pilot production and trials of developed Ag nanoparticle modified implants and Ag based nanostructured composites: 1. TiO2 and Hydroxyapatite Ca10(PO4)6(OH)2) coated implants which are widely used in orthopaedic surgery because of their good biocompatibility related to the osteoconductive properties of calcium phosphate coating; 2. Ag-SnO contacts for electrical systems; these composites combine high resistance to welding and to electric arch erosion of the refractory phases with the high electric and thermal conductivities.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: NMP.2010.1.2-4 | Award Amount: 3.75M | Year: 2010
Successful adaptation of nanotechnology in the end-products requires an access to the nanofiller technology and to the raw materials. The MINANO-project brings together partners representing end-users product know-how, formulation and processing technology and most importantly secure and reliable source of nano raw materials. Although there has been tremendous development in the area of nanocompounds with improved functionality, there exists a need to develop an efficient, continuous method of large-scale, low-cost synthesis of such materials. To answer to this need the following steps are suggested: 1) Integrate the functionalization of the high-quality nanoparticles directly on the continuous mass-production process already in the mining industry, 2) ensure controlled dispersion to the matrix material in large scale by cooperation between nanoparticle producer and end-product manufacturer, 3) assure sustainable and safe production and use by state-of-the-art life-cycle analysis. Based on the mass production process and cooperative value chain we concentrate on three major functionalities: Flame retardancy, UV resistance and antimicrobial properties. These properties are achieved by functionalized Mg(OH)2, ZnO and Ag nanoparticles. Societal and industrial impacts of these properties are extensive and there is a strong request of these functionalities for both plastic and wood-plastic based matrix materials. The use of nano-sized functional filler materials enables to use smaller amount of additives thus giving better recyclability, lower weight, higher mechanical strength and potential multifunctional features to the end-product. The combination of new nanofunctionalities gives far reaching possibilities for new types of functional plastics, and completely new possibilities to wood-plastic composites as well. This moves both mining industry and end-product companies towards high-tech on the long run.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: NMP.2010.1.2-4 | Award Amount: 1.99M | Year: 2010
Antibacterial coatings represent a huge market in healthcare and food sectors.CuVito brings together Mexican mining products and European product development, to produce a state-of-the-art copper nano-structured coating. Bacteria in hospitals present a major health issue.The effectiveness of cleaning is considerably enhanced on smooth, scratch-free surfaces.Anti-bacterial silver coatings are available; however they are not used in hospitals due to cost, effectiveness and durability.Copper offers a low cost, effective and environmentally friendly solution that could be readily adopted. The challenge is to retain copper nano-particles in a structure that provides antibacterial functionality, but prevents leaching.The CuVito consortium believes that the silsesquioxane structure, formed using Vitolane technology is the answer. Silsesquioxanes have the formula RSiO1.5 (where R is an organic ligand), and form cage or ladder structures.They confer hardness and abrasion resistance to coatings and, by selecting appropriate R groups (e.g. acrylate, glycidoxy) can chemically bond to the organic resin in the formulation controlling cross-link density to enhance durability.Hence silsesquioxanes are inherently suited to use in coatings for surfaces which require regular cleaning.Silsesquioxanes have been available for some years but at a prohibitively high cost, due to the complexity of manufacture.Vitolane technology is an alternative, cost effective production route which has been patented and is currently being scaled up commercially.It has a unique processing feature in allowing simple selection of R groups and it is proposed to use this to bond directly to the copper nanoparticles, resolving the issue of leaching.The objectives of the project of the project are: 1.Develop a copper nano-particle production process 2.Functionalise silsesquioxanes with copper using Vitolane technology 3.Produce a commercially acceptable coating 4.Validate coating in a hospital environment
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: NMP-2008-1.3-2 | Award Amount: 2.93M | Year: 2009
Metal oxide and metal NPs are particularly dangerous for two reasons: their special catalytic activity coming from the properties of their nanointerface may interfere with numerous intracellular biochemical processes and the decomposition of NPs and the ion leakage could heavily interfere with the intracellular free metal ion homeostasis, which is essential for cell metabolism. A very specific problem is the difficulty of localizing and quantifying them in cells. Obtaining dose effect relationships is not simple, because of the unknown amount of material present in affected cells. The following main points will be addressed in this proposal:1) Design and synthesis of metal oxide and metal NPs, which can be traced by SPECT, PET, and fluorescence techniques and the appropriate characterization of these NPs.2) Application of label-free techniques, such as IBM and EM to ensure that the radioactive and fluorescent constituents do not modify the cytological and organismic response by themselves.3) Characterization of the uptake, distribution kinetics and NP release at the level of the organism.4) Study of the interaction of NPs with plasma components forming complexes with NPs and the assessment of their possible impact on the uptake compared with that of bare or capped particles.5) Quantification and localization of metallic NPs in immune competent cells is a key task for the establishment of proper dose-response correlations. A technique applicable with living cells as ultimate control will be IBM, capable of detecting single metal NPs in cells at different depths.6) Development of sophisticated cell physiological approaches focusing on the determination of oxidative activity, cytokine production and adaptive processes concerning signalling pathways beyond standard vitality tests. The research project will indicate toxic levels of various NPs and sub-toxic effects will be investigated by analysing the signalling response of immune cells
Research Center En Quimica Aplicada, Instituto Nacional de Investigaciones Nucleares and Research Center Cientifica Of Yucatan | Date: 2013-07-03
A method for obtaining sweet gas, synthetic gas, and sulphur from natural gas. The method includes the steps of removing impurities from the natural gas for obtaining pre-treated natural gas; sweetening the pre-treated natural gas through a separation using a plurality of membranes for obtaining sweet gas and acid gases; ionizing the acid gases to dissociate them into sulphur and synthetic gas with remnants of acid gases; and neutralizing the synthetic gas with remnants of acid gases for generating sweet gas. Likewise, a system is presented on how to implement the method.
Lopez-Dominguez V.,University of Barcelona |
Hernaindez J.M.,University of Barcelona |
Tejada J.,University of Barcelona |
Ziolo R.F.,Research Center en Quimica Aplicada
Chemistry of Materials | Year: 2013
In this work, we show the enormous size effect on the ordering transition temperature, TO, in samples of CoFe2O4 nanoparticles with diameters ranging from 1 to 9 nm. Samples were characterized by HRTEM and XRD analyses and show a bimodal particle size distribution centered at 3 nm and around 6 nm for "small" and "large" particles, respectively. The results and concomitant interpretation were derived from studies of the magnetization dependence of the samples on temperature at low and high magnetic fields and relaxation times using both dc and ac fields. The large particles show a typical superparamagnetic behavior with blocking temperatures, TB, around 100 K and a Curie temperature, T C, above room temperature. The small particles, however, show a colossal reduction of their magnetic ordering temperature and display paramagnetic behavior down to ∼10 K. At lower temperatures, these small particles are blocked and show both exchange and anisotropy field values above 5 T. The order of magnitude reduction in TO demonstrates a heretofore unreported magnetic behavior for ultrasmall nanoparticles of CoFe 2O4, suggesting its further study as an advanced material. © 2012 American Chemical Society.
Sanchez-Valdes S.,Research Center en Quimica Aplicada
Polymer Bulletin | Year: 2014
Silver nanoparticles were deposited on the surface of an extruded film of linear low density polyethylene/cyclo olefin copolymer (LLDPE/COC) blend by an ultrasound-assisted method. A series of LLDPE/COC/silver nanocomposites, containing 0.02, 0.05, 0.08 and 0.1 mol/L of AgNO3 were prepared and characterized. The effect of ultrasound method on the silver deposition on the film surface was characterized as well as the effect of silver nanoparticles on their fungicidal characteristics. The silver action and biocide effect of the films were enhanced significantly as the silver content increased from 0.02 to 0.08 mol/L of AgNO3 and after that no significant enhancement was observed. From the UV-Vis analysis and transmission electron microscopic observations, the particle shape, size and size distribution were determined. Films of LLDPE/COC blends with silver deposition exhibited a noticeable increase in water vapor barrier properties with the increase in the concentration of AgNO3 and demonstrated good fungicidal activity, specifically against fungus Aspergillius niger. The observed results could be applied in the design of industrial films for packaging. © 2014 Springer-Verlag Berlin Heidelberg.
Research Center En Quimica Aplicada | Date: 2013-08-21
A method for producing drug-loaded polymeric nanoparticles, which includes the steps of: (a) preparing a first solution by dissolving a drug in a polymerizable monomer; (b) preparing a micellar solution by dissolving a surfactant and a water-soluble radical initiator in water; (c) adding said first solution to said micellar solution for polymerizing said polymerizable monomer, obtaining a dispersion of drug-loaded polymeric nanoparticles, the drug-loaded polymeric nanoparticles have a controlled size with average diameter smaller than 50 nm; and (d) evaporating residual polymerizable monomer from the dispersion of drug-loaded polymeric nanoparticles.
Corral-Flores V.,Research Center en Quimica Aplicada |
Bueno-Baques D.,Research Center en Quimica Aplicada |
Ziolo R.F.,Research Center en Quimica Aplicada
Acta Materialia | Year: 2010
Novel multiferroic nanostructures of cobalt ferrite-barium titanate were synthesized by a two-step wet chemical procedure, combining co-precipitation and sol-gel techniques. The fraction of cobalt ferrite in the nanostructures was varied from 20 to 60 wt.%. X-ray diffraction confirmed the presence of both the spinel and the perovskite phases, with average crystallite sizes in the range of 15-28 nm. Both the degree of tetragonality of barium titanate and the lattice parameter of cobalt ferrite significantly increased with the content of ferrite in the nanostructures, revealing a crystallographic distortion related to the shell thickness. Transmission electron microscopy data showed two-phase composite nanostructures consisting of a cobalt ferrite core surrounded by a barium titanate shell-like coating. Magnetization data showed expected ferromagnetic behavior. The multiferroic nanostructures are proposed as building blocks for higher-order multiferroic inorganic and hybrid inorganic-organic nanocomposites. © 2009 Acta Materialia Inc.
Research Center En Quimica Aplicada | Date: 2012-12-07
A method for preparing polymeric nanoparticles having entrapped active ingredients or drugs, the method includes the step of preparing a reaction by mixturing water, a surfactant, and a water-soluble radical initiator; polymerizing a polymerizable monomer in the reaction to obtain a dispersion of polymeric nanoparticles having a controlled size with average diameters smaller than 50 nm; dissolving one or more active ingredients in a suitable solvent; adding the solution of active ingredients to the dispersion of polymeric nanoparticles and allowing that the active ingredients to become entrapped within polymeric nanoparticles; and evaporating the dispersion of polymeric nanoparticles having entrapped active ingredients to evaporate the residual monomer and the solvent used as a vehicle for loading the active ingredient.