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Rodrigo E.,Autonomous University of Madrid | Garcia Alcubilla B.,Autonomous University of Madrid | Sainz R.,Nanoinnova Technologies SL | Fierro J.L.G.,CSIC - Institute of Catalysis | And 2 more authors.
Chemical Communications | Year: 2014

Reduced graphene oxide (rGO) has been used as a support for piperazine to provide a heterogeneous bifunctional organocatalyst (rGO-NH) that is able to efficiently promote vintage organic transformations such as Knoevenagel, Michael and aldol reactions. The obtained results suggest a significant role of the support in the course of these reactions. This journal is © the Partner Organisations 2014.


Liu Y.,Wuhan Textile University | Liu Y.,IMDEA Madrid Institute for Advanced Studies | Babu H.V.,IMDEA Madrid Institute for Advanced Studies | Zhao J.,South China University of Technology | And 5 more authors.
Composites Part B: Engineering | Year: 2016

Cu-doped graphene (graphenit-Cu) was successfully prepared through chemical reduction method, and its surface morphology, crystalline structure and Cu content in graphenit-Cu were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), inductive couple plasma (ICP) and electrochemical cyclic voltammetry, respectively. Graphenit-ox/epoxy systems and graphenit-Cu/epoxy systems were prepared, and the contents of graphenit-ox and graphenit-Cu were kept as 1 and 3 wt%, respectively. The effect of graphenit-ox or graphenit-Cu on the flame retardancy, combustion properties, thermal degradation and thermomechanical properties of epoxy resin was investigated systematically by limiting oxygen index (LOI), cone calorimeter (Cone), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Compared to graphenit-ox, the addition of graphenit-Cu reduced the heat release rate (HRR), total smoke production (TSP) and smoke production rate (SPR), and improved LOI values of epoxy composites. Moreover, the addition of graphenit-ox also had little flame retardant effect on epoxy composite. The possible synergistic effect between graphene and Cu was confirmed in the flame retardant epoxy composites. TGA and DMA results also indicated the considerable effect on the thermal degradation and thermomechanical properties of epoxy composites with the addition of graphenit-Cu. The results supplied an effective solution for developing excellent flame retardant epoxy composites. © 2015 Elsevier Ltd. All rights reserved.


Kamanina N.V.,S. I. Vavilov State Optical Institute | Rozhkova N.N.,Russian Academy of Sciences | Chernozatonskii L.A.,RAS Emanuel Institute of Biochemical Physics | Shmidt N.M.,RAS Ioffe Physical - Technical Institute | And 3 more authors.
Nonlinear Optics Quantum Optics | Year: 2012

The effect of nano-objects, such as fullerenes, nanotubes, quantum dots, shungites, graphene oxides, etc. on the nonlinear refraction and third order susceptibility as well as their influence on some surface peculiarities of the organic and inorganic materials are discussed under conditions when these nano-objects are used as nanosensitizers or as nanocoatings. © 2012 Old City Publishing, Inc.


Grant
Agency: European Commission | Branch: FP7 | Program: MC-ITN | Phase: FP7-PEOPLE-2013-ITN | Award Amount: 3.92M | Year: 2013

The proposed ITN BIOENERGY deals with the understanding of experimental limits and fundamental principles for exploiting and developing electro-conducting nanoarchitectures to assemble highly efficient bioelectrocatalytic structures as a basis for efficient and stable biofuel cells. Based on that fundamental understanding, the main technological objective of BIOENERGY is to develop efficient and stable biofuel cells including potentially implantable biodevices. Individual elements like electrodes, enzymes and mediators will be developed, integrated into each other and finally assembled to bio fuel cells. ESR and ER will be work on the all tasks of this scientific chain being therefore trained in the fundamentals of bioelectrochemistry, modern experimental methods in bioelectrochemistry and applications of bioelectrochemistry. Training of the fellows will take place at the host institute, via secondments, workshops, summer schools and joint measurement campaigns. The scientific training will be completed by training of complementary skill with respect management, fund raising and scientific communication. The consortium consists of the leading scientists in bioelectrochemistry in Europe and is supported by several private partners working in the field. It is expected that BIOENERGY will improve the availability of a highly skilled workforce for European industries and research, and will be the seed of innovative long-term research and education in bioelectrochemistry.


Rincon A.,Institute Ceramica y Vidrio ICV | Moreno R.,Institute Ceramica y Vidrio ICV | Gutierrez-Gonzalez C.F.,University of Oviedo | Saiz R.,Nanoinnova Technologies SL | And 2 more authors.
Journal of the European Ceramic Society | Year: 2016

Multilayer materials have demonstrated to provide an efficient mechanism for toughening by deflection of a propagating crack by weak interlayers. Therefore, the aim of this work is to study the colloidal processing of 8 mol% yttria stabilized zirconia (8YSZ) based laminates by intercalating thin layers of graphene enriched with 8YSZ, and to evaluate the advantages of such multilayered structure in the propagation of cracks induced by indentation. Green tapes of 8YSZ and graphene-oxide with YSZ were obtained by aqueous tape casting and sintered in one-step by spark plasma sintering at 1400. °C. Microindentation results showed that the indentation cracks propagate within the horizontal direction within the ceramic layer, but in the cross-sectional direction the presence of the GO-rich layers stops the cracks without deflection or bifurcation. The hardness and elastic modulus values were higher than 17.6. GPa and 230. GPa, respectively, and similar for all layers. © 2016 Elsevier Ltd.


Di Bari C.,CSIC - Institute of Catalysis | Goni-Urtiaga A.,Nanoinnova Technologies SL | Pita M.,CSIC - Institute of Catalysis | Shleev S.,Malmö University | And 3 more authors.
Electrochimica Acta | Year: 2016

High surface area graphene electrodes were prepared by simultaneous electrodeposition and electroreduction of graphene oxide. The electrodeposition process was optimized in terms of pH and conductivity of the solution and the obtained graphene electrodes were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy and electrochemical methods (cyclic voltammetry and impedance spectroscopy). Electrodeposited electrodes were further functionalized to carry out covalent immobilization of two oxygen-reducing multicopper oxidases: laccase and bilirubin oxidase. The enzymatic electrodes were tested as direct electron transfer based biocathodes and catalytic currents as high as 1 mA/cm2 were obtained. Finally, the mechanism of the enzymatic oxygen reduction reaction was studied for both enzymes calculating the Tafel slopes and transfer coefficients. © 2016 Elsevier Ltd. All rights reserved.


Ali-Boucetta H.,University College London | Ali-Boucetta H.,University of Birmingham | Nunes A.,University College London | Sainz R.,CNRS Strasbourg Institute of Chemistry | And 6 more authors.
Angewandte Chemie - International Edition | Year: 2013

Sometimes shorter is better: The apparent similarity between multi-walled carbon nanotubes (MWNTs) and asbestos fibers has generated serious concerns about their safety profile. The asbestos-like pathogenicity observed for long, pristine nanotubes (NTlong, see scheme) can be completely alleviated if their effective length is decreased as a result of chemical functionalization, such as with tri(ethylene glycol) (TEG). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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