84 research outputs found
Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay of 5Î He and 12Î C
We present general explicit expressions for a shell-model calculation of the vector hypernuclear parameter in nonmesonic weak decay. We use a widely accepted effective coupling Hamiltonian involving the exchange of the complete pseudoscalar and vector meson octets (Ï, η, K, Ï, Ï, K*). In contrast to the approximated formula widely used in the literature, we correctly treat the contribution of transitions originated from single-proton states beyond the s-shell. Exact and simple analytical expressions are obtained for the particular cases of 5ÎHe and 12ÎC, within the one-pion-exchange model. Numerical computations of the asymmetry parameter, aÎ, are presented. Our results show a qualitative agreement with other theoretical estimates but also a contradiction with recent experimental determinations. Our simple analytical formulas provide a guide in searching the origin of such discrepancies, and they will be useful for helping to solve the hypernuclear weak decay puzzle.Facultad de Ciencias Exacta
Asymmetry parameter for the nonmesonic decay of Î5He
We report the preliminary result of an exact calculation of the asymmetry parameter, aÎ, in the nonmesonic hypernuclear decay, based on a one-meson-exchange (OME) model. For the case of Î 5He and including one-pion-exchange only, the result is shown not to differ considerably from the one obtained with the approximate formula widely used in the literature. In particular, the sign of aÎ remains negative, in disagreement with its most recent experimental determination. Whether these facts remain true for heavier hypernuclei and in a more complete OME model is still under investigation.Facultad de Ciencias Exacta
Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay of 5Î He and 12Î C
We present general explicit expressions for a shell-model calculation of the vector hypernuclear parameter in nonmesonic weak decay. We use a widely accepted effective coupling Hamiltonian involving the exchange of the complete pseudoscalar and vector meson octets (Ï, η, K, Ï, Ï, K*). In contrast to the approximated formula widely used in the literature, we correctly treat the contribution of transitions originated from single-proton states beyond the s-shell. Exact and simple analytical expressions are obtained for the particular cases of 5ÎHe and 12ÎC, within the one-pion-exchange model. Numerical computations of the asymmetry parameter, aÎ, are presented. Our results show a qualitative agreement with other theoretical estimates but also a contradiction with recent experimental determinations. Our simple analytical formulas provide a guide in searching the origin of such discrepancies, and they will be useful for helping to solve the hypernuclear weak decay puzzle.Facultad de Ciencias Exacta
Direct patterning of polystyreneâpolymethyl methacrylate copolymer by means of laser interference lithography using UV laser irradiation
The fabrication of functionalized surfaces on polymericsubstrates is of importance in chemistry, biology,physics, and material science. Examples of functionalsurfaces are micro/nano periodic arrays that can befabricated using different methods. However, many ofthese techniques require several fabrication steps. Inthis communication, we report the fabrication of advancedarchitectures in poly(methylmethacrylate)?polystyrene(PMMA?PS) copolymers using direct laserinterference patterning. Because of the mixed opticalproperties of the copolymers, a different type of periodicarchitectures could be fabricated when comparedwith traditional pure polymers. This new type of periodicstructures results from the local swelling of thecopolymer due to the formation of gaseous productsinduced by the laser radiation. Additionally, relativelylow laser fluences are necessary to initiate the ablationprocess of the copolymers.Fil: Lasagni, A.F.. Universitat Saarland; AlemaniaFil: Acevedo, Diego Fernando. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Universitat Saarland; Alemania. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba; ArgentinaFil: Barbero, CĂ©sar Alfredo. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba; ArgentinaFil: MĂŒcklich, F.. Universitat Saarland; Alemani
Formic acid oxidation over hierarchical porous carbon containing PtPd catalysts
The use of high surface monolithic carbon as support for catalysts offers important advantage, such as elimination of the ohmic drop originated in the interparticle contact and improved mass transport by ad-hoc pore design. Moreover, the approach discussed here has the advantage that it allows the synthesis of materials having a multimodal porous size distribution, with each pore size contributing to the desired properties. On the other hand, the monolithic nature of the porous support also imposes new challenges for metal loading. In this work, the use of Hierarchical Porous Carbon (HPC) as support for PtPd nanoparticles was explored. Three hierarchical porous carbon samples (denoted as HPC-300, HPC-400 and HPC-500) with main pore size around 300, 400 and 500 nm respectively, are used as porous support. PtPd nanoparticles were loaded by impregnation and subsequent chemical reduction with NaBH4. The resulting material was characterized by EDX, XRD and conventional electrochemical techniques. The catalytic activity toward formic acid and methanol electrooxidation was evaluated by electrochemical methods, and the results compared with commercial carbon supported PtPd. The Hierarchical Porous Carbon support discussed here seems to be promising for use in DFAFC anodes.Fil: Baena Moncada, AngĂ©lica MarĂa. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Morales, Gustavo Marcelo. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Barbero, CĂ©sar Alfredo. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Planes, Gabriel Angel. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Florez Montano, Jonathan. Universidad de la Laguna; EspañaFil: Pastor, Elena. Universidad de la Laguna; Españ
Effect of chemical functionalization on the electrochemical properties of conducting polymers. Modification of polyaniline by diazonium ion coupling and subsequent reductive degradation
The electrochemical properties of polyaniline (PANI) can be altered by coupling the polymer with aryldiazonium ions. The ions are synthesized by diazotization of aromatic primary amines (1-aminoanthraquinone, sulphadiazine and 4-cyanoaniline) bearing functional groups which are then linked to the polyaniline backbone. All materials produced are electroactive, suggesting that the reaction involves coupling of the diazonium ion with the aromatic rings and not nucleophilic substitution by the aminic nitrogen of PANI on the aryl cations. The electrochemical properties of the modified polymers are different to those of PANI, likely due to electronic and steric effects of the attached groups. Reductive degradation of the azo linkages, using dithionite ion, removes the attached moieties leaving primary amino groups attached to the polyaniline backbone. In that way, the effect of the attached groups on the electrochemical properties of PANI is eliminated. FTIR spectroscopy measurement of the different polymers supports the proposed mechanism. Using the method a polymer containing redox (anthraquinone) groups, which could be used for charge storage, is obtained. Additionally a material containing sulphadiazine moieties, which can be released in vivo by bacterial activity, is also produced. The molecule is a well-known sulfa drug with bacteriostatic activity. The reaction sequence seems to be of general application to modify polyanilines, by attaching functional groups, and then to produce a PANI backbone bearing primary amino groups. Evidence is presented on the kinetic control of attached group removal. © 2011 Elsevier Ltd. All rights reserved.Fil: Acevedo, Diego Fernando. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; ArgentinaFil: Rivarola, Claudia Rosana. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; Argentina. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; ArgentinaFil: Miras, MarĂa C.. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; ArgentinaFil: Barbero, CĂ©sar Alfredo. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; Argentin
Bioethanol production by reusable Saccharomyces cerevisiaeimmobilized in a macroporous monolithic hydrogel matrices
Performance of yeasts on industrial processes can be dramatically improved by immobilization of the biocatalyst. The immobilization of Saccharomyces cerevisiae inside monolithic macroporous hydrogels were produced by in-situ polymerization of acrylamide around a live yeast suspension under cryogelation conditions. Preculture of the yeasts was not necessary and this innovative and simple procedure is amenable to scaling-up to industrial production. The yeasts were efficiently retained in monolithic hydrogels, presenting excellent mechanical properties and high cell viability. Macroporous hydrogels showed a fast mass transport allowing the hydrogel-yeast complexes achieved similar ethanol yield and productivity than free yeasts, which is larger than those reached with yeasts immobilized in compact hydrogels. Moreover, the same yeasts were able to maintain its activity by up to five reaction cycles with a cell single batch during fermentation reactions.Fil: Mulko, Lucinda Emma. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba; ArgentinaFil: Rivarola, Claudia Rosana. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba; Argentina. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; ArgentinaFil: Barbero, CĂ©sar Alfredo. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba; ArgentinaFil: Acevedo, Diego Fernando. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba; Argentina. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentin
Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay of 5Î He and 12Î C
We present general explicit expressions for a shell-model calculation of the vector hypernuclear parameter in nonmesonic weak decay. We use a widely accepted effective coupling Hamiltonian involving the exchange of the complete pseudoscalar and vector meson octets (Ï, η, K, Ï, Ï, K*). In contrast to the approximated formula widely used in the literature, we correctly treat the contribution of transitions originated from single-proton states beyond the s-shell. Exact and simple analytical expressions are obtained for the particular cases of 5ÎHe and 12ÎC, within the one-pion-exchange model. Numerical computations of the asymmetry parameter, aÎ, are presented. Our results show a qualitative agreement with other theoretical estimates but also a contradiction with recent experimental determinations. Our simple analytical formulas provide a guide in searching the origin of such discrepancies, and they will be useful for helping to solve the hypernuclear weak decay puzzle.Facultad de Ciencias Exacta
Asymmetry parameter for the nonmesonic decay of Î5He
We report the preliminary result of an exact calculation of the asymmetry parameter, aÎ, in the nonmesonic hypernuclear decay, based on a one-meson-exchange (OME) model. For the case of Î 5He and including one-pion-exchange only, the result is shown not to differ considerably from the one obtained with the approximate formula widely used in the literature. In particular, the sign of aÎ remains negative, in disagreement with its most recent experimental determination. Whether these facts remain true for heavier hypernuclei and in a more complete OME model is still under investigation.Facultad de Ciencias Exacta
Acid hydrogel matrixes as reducing/stabilizing agent for the in-situ synthesis of Ag-nanocomposites by UV irradiation: PH effect
Synthetic methods to obtain Ag-nanocomposites are widely studied in order to produce antimicrobialmaterials without using harmful agents for possible applications in biologic systems. In this way, thenanocomposites could be able to apply in biomedicine area avoiding going through exhaustiveprocesses of purification. Biocompatible hydrogel based on N-isopropylacrylamide (NIPAM)copolymerized with different proportions of methacrylic acid (MAA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS), were proposed as matrixes of Ag-nanocomposites. A comprehensive studyof the physicochemical behavior, reducing and stabilizing character of the matrixes were carried out atpH 2 and 7. Hydrogel nanopores were used as photoreducing of Ag+ ions and stabilizing of Agnanoparticles(Ag-NPs) at the same time. Most of the matrixes showed high reducing character atpH 7 while at pH 2 it was significantly reduced. Photoreducer character at pH 7 increased with MAAco-monomer concentration and Ag-NPs sizes of 4?5 nm were obtained. In addition, it wasdemonstrated that acidic co-monomers favor the stabilization of Ag-NPs avoiding agglomerations. Itwas possible to conclude that the photoreduction reaction takes mainly place at pH 7 when nonbonding electron pairs from carboxylic and amide groups of the matrix are available. Therefore,biocompatible and antimicrobial nanocomposites can be easily synthesized without using damagingadditives(reducer, solvent) and be applied in biomedicine.Fil: Broglia, Martin Federico. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Departamento de QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Balmaceda, Ivana. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; ArgentinaFil: Carrizo, Florencia. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; ArgentinaFil: Barbero, CĂ©sar Alfredo. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; ArgentinaFil: Rivarola, Claudia Rosana. Universidad Nacional de RĂo Cuarto. Facultad de Ciencias Exactas FisicoquĂmicas y Naturales. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados. - Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - CĂłrdoba. Instituto de Investigaciones en TecnologĂas EnergĂ©ticas y Materiales Avanzados; Argentin
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