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  1. Article ; Online: Low temperature nucleation of thermochromic VO

    Alcaide, A M / Regodon, G / Ferrer, F J / Rico, V / Alvarez, R / Rojas, T C / González-Elipe, A R / Palmero, A

    Nanotechnology

    2023  Volume 34, Issue 25

    Abstract: The low temperature formation of monoclinic ... ...

    Abstract The low temperature formation of monoclinic VO
    Language English
    Publishing date 2023-04-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/acc664
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Optimization of anion exchange membrane water electrolyzers using ionomer-free electrodes

    López-Fernández, E. / Gómez-Sacedón, C. / Gil-Rostra, J. / Espinós, J.P. / Brey, J. Javier / González-Elipe, A.R. / de Lucas-Consuegra, A. / Yubero, F.

    Renewable energy. 2022 Sept., v. 197

    2022  

    Abstract: This work is carried out in the context of the anion exchange membrane water electrolysis (AEMWE) and pursuits to determine the influence of different cell components on the global electrochemical performance. Ionomer-free electrodes consisting of anodic ...

    Abstract This work is carried out in the context of the anion exchange membrane water electrolysis (AEMWE) and pursuits to determine the influence of different cell components on the global electrochemical performance. Ionomer-free electrodes consisting of anodic Ni–Fe and cathodic Ni electrocatalysts deposited by magnetron sputtering in an oblique angle deposition configuration were utilized for this study. In addition to the characteristics and equivalent thickness of the electrocatalysts, other factors affecting the efficiency that have been considered in this study encompass the type of gas diffusion layer (GDLs), including carbon paper and stainless-steel fiber paper supports, and several commercial anion exchange membranes. The electrocatalytic performances in both a three-electrode and complete single cell AEMWE set-ups, together with the physico-chemical characterization of the electrodes before and after operation, have served to select the optimum components for the utilized cell configuration. Thus, current densities of 670 mA cm⁻², at polarization voltage of 2.2 V, 1.0 M KOH electrolyte and 40 °C were obtained in a membrane electrode assembly. A seven days chronopotentiometry experiment at a fixed current of 400 mA cm⁻² demonstrated a noticeable stability of this type of AEMWE cells incorporating ionomer-free electrodes.
    Keywords anion exchange ; anion-exchange membranes ; carbon ; electric potential difference ; electrochemistry ; electrodes ; electrolysis ; electrolytes ; paper ; physicochemical properties ; renewable energy sources ; stainless steel
    Language English
    Dates of publication 2022-09
    Size p. 1183-1191.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2001449-1
    ISSN 1879-0682 ; 0960-1481
    ISSN (online) 1879-0682
    ISSN 0960-1481
    DOI 10.1016/j.renene.2022.08.013
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Growth dynamics of nanocolumnar thin films deposited by magnetron sputtering at oblique angles.

    Alvarez, R / Garcia-Valenzuela, A / Regodon, G / Ferrer, F J / Rico, V / Garcia-Martin, J M / Gonzalez-Elipe, A R / Palmero, A

    Nanotechnology

    2023  Volume 35, Issue 9

    Abstract: The morphology of numerous nanocolumnar thin films deposited by the magnetron sputtering technique at oblique geometries and at relatively low temperatures has been analyzed for materials as different as Au, Pt, Ti, Cr, ... ...

    Abstract The morphology of numerous nanocolumnar thin films deposited by the magnetron sputtering technique at oblique geometries and at relatively low temperatures has been analyzed for materials as different as Au, Pt, Ti, Cr, TiO
    Language English
    Publishing date 2023-12-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ad113d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Ripening and recrystallization of NaCl nanocrystals in humid conditions

    Oliva-Ramirez, M / Macías-Montero, M / Borras, A / González-Elipe, A. R

    RSC advances. 2016 Jan. 07, v. 6, no. 5

    2016  

    Abstract: This study shows that Ostwald ripening, a universal mechanism responsible for the increase of crystal size during precipitation from solutions, can be meditated by ion diffusion through condensed monolayers of water that connect separated nanocrystals. ... ...

    Abstract This study shows that Ostwald ripening, a universal mechanism responsible for the increase of crystal size during precipitation from solutions, can be meditated by ion diffusion through condensed monolayers of water that connect separated nanocrystals. In an environmental electron microscope we have observed “in situ” the time evolution of the number, shape, size and crystallographic texture of NaCl nanoparticles deposited by electron beam evaporation at oblique angles. Analysis of NaCl nanoparticles before and after water vapor condensation has evidenced that the size of nanocrystals is not the unique driving force inducing nanoparticle ripening and recrystallization, but the faceting of their crystalline habits and the amorphisation degree of the initially deposited nuclei also play important roles. These findings have implications for other crystallization and nucleation processes and can be of relevance for rock weathering and related phenomena.
    Keywords Ostwald ripening ; condensation (phase transition) ; crystallization ; evaporation ; nanocrystals ; nanoparticles ; sodium chloride ; texture ; water vapor ; weathering
    Language English
    Dates of publication 2016-0107
    Size p. 3778-3782.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c5ra22425j
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Silver and gold nanoparticles in nanometric confined templates: synthesis and alloying within the anisotropic pores of oblique angle deposited films.

    Parra-Barranco, J / Sanchez-Valencia, J R / Barranco, A / González-Elipe, A R

    Nanotechnology

    2017  Volume 28, Issue 48, Page(s) 485602

    Abstract: In this work we have developed an infiltration methodology to incorporate metal nanoparticles (NPs) of controlled size and shape into the open voids available in oblique angle deposited thin films. These NPs exhibited well-defined surface plasmon ... ...

    Abstract In this work we have developed an infiltration methodology to incorporate metal nanoparticles (NPs) of controlled size and shape into the open voids available in oblique angle deposited thin films. These NPs exhibited well-defined surface plasmon resonances (SPRs). The nanometric confined space provided by their porous microstructure has been used as a template for the growth of anisotropic NPs with interesting SPR properties. The fabrication methodology has been applied for the preparation of films with embedded Ag and Au NPs with two associated plasmon resonance features that developed a dichroic behaviour when examined with linearly polarized light. A confined alloying process was induced by near IR nanosecond laser irradiation yielding bimetallic NPs with SPR features covering a large zone of the electromagnetic spectrum. The possibilities of the method for the tailored fabrication of a wide range colour palette based on SPR features are highlighted.
    Language English
    Publishing date 2017-12-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/aa92af
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Kinetic energy-induced growth regimes of nanocolumnar Ti thin films deposited by evaporation and magnetron sputtering.

    Alvarez, R / Garcia-Valenzuela, A / Rico, V / Garcia-Martin, J M / Cotrino, J / Gonzalez-Elipe, A R / Palmero, A

    Nanotechnology

    2019  Volume 30, Issue 47, Page(s) 475603

    Abstract: We experimentally analyze different growth regimes of Ti thin films associated to the existence of kinetic energy-induced relaxation mechanisms in the material's network when operating at oblique geometries. For this purpose, we have deposited different ... ...

    Abstract We experimentally analyze different growth regimes of Ti thin films associated to the existence of kinetic energy-induced relaxation mechanisms in the material's network when operating at oblique geometries. For this purpose, we have deposited different films by evaporation and magnetron sputtering under similar geometrical arrangements and at low temperatures. With the help of a well-established growth model we have found three different growth regimes: (i) low energy deposition, exemplified by the evaporation technique, carried out by species with typical energies in the thermal range, where the morphology and density of the film can be explained by solely considering surface shadowing processes, (ii) magnetron sputtering under weak plasma conditions, where the film growth is mediated by surface shadowing mechanisms and kinetic-energy-induced relaxation processes, and (iii) magnetron sputtering under intense plasma conditions, where the film growth is highly influenced by the plasma, and whose morphology is defined by nanocolumns with similar tilt than evaporated films, but with much higher density. The existence of these three regimes explains the variety of morphologies of nanocolumnar Ti thin films grown at oblique angles under similar conditions in the literature.
    Language English
    Publishing date 2019-08-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ab3cb2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Physiological Degradation Mechanisms of PLGA Membrane Films under Oxygen Plasma Treatment

    López-Santos, C / Terriza A / Portolés J / Yubero F / González-Elipe A. R

    The Journal of Physical Chemistry C. 2015 Sept. 03, v. 119, no. 35

    2015  

    Abstract: Degradation under simulated physiological conditions of poly(lactic-co-glycolic) (PLGA) copolymer membrane films subjected to an oxygen plasma treatment compared to its “as prepared” state has been studied by gas cluster ion beam assisted X-ray ... ...

    Abstract Degradation under simulated physiological conditions of poly(lactic-co-glycolic) (PLGA) copolymer membrane films subjected to an oxygen plasma treatment compared to its “as prepared” state has been studied by gas cluster ion beam assisted X-ray photoelectron spectroscopy for chemical depth profiling analysis. This investigation is complemented with atomic force microscopy, weight loss measurements, and visual inspection of the films at the different stages of the degradation process. The obtained results show that the carbon functional groups of the PLGA membrane films undergo a heterogeneous hydrolytic degradation to different rates depending on the plasma pretreatment. The content of glycolic groups (GA) in untreated PLGA samples immersed for 3 weeks in a phosphate-buffered saline solution decreased at the surface, whereas the ratio between glycolic and lactic units (LA) did not vary in the inner regions (∼400 nm depth) of the degraded membrane films. By contrast, oxygen plasma pretreatment enhances the degradation efficiency and causes that both lactic and glycolic functional components decreased at the surface and in the interior of the film, although with less prevalence for the lactic units that present a comparatively higher resistance to degradation.
    Keywords X-ray photoelectron spectroscopy ; atomic force microscopy ; carbon ; composite polymers ; moieties ; oxygen ; sodium chloride ; weight loss
    Language English
    Dates of publication 2015-0903
    Size p. 20446-20452.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021%2Facs.jpcc.5b05011
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Single-step fabrication process of 1-D photonic crystals coupled to nanocolumnar TiO<sub>2</sub> layers to improve DSC efficiency.

    González-García, L / Colodrero, S / Míguez, H / González-Elipe, A R

    Optics express

    2015  Volume 23, Issue 24, Page(s) A1642–50

    Abstract: The present work proposes the use of a TiO ... 2 ... electrode coupled to a one-dimensional photonic crystal (1DPC), all formed by the sequential deposition of nanocolumnar thin films by physical vapor oblique angle deposition (PV-OAD), to enhance the ... ...

    Abstract The present work proposes the use of a TiO<sub>2</sub> electrode coupled to a one-dimensional photonic crystal (1DPC), all formed by the sequential deposition of nanocolumnar thin films by physical vapor oblique angle deposition (PV-OAD), to enhance the optical and electrical performance of DSCs while transparency is preserved. We demonstrate that this approach allows building an architecture combining a non-dispersive 3 µm of TiO<sub>2</sub> electrode and 1 µm TiO<sub>2</sub>-SiO<sub>2</sub> 1DPC, both columnar, in a single-step process. The incorporation of the photonic structure is responsible for a rise of 30% in photovoltaic efficiency, as compared with a transparent cell with a single TiO<sub>2</sub> electrode. Detailed analysis of the spectral dependence of the photocurrent demonstrates that the 1DPC improves light harvesting efficiency by both back reflection and optical cavity modes confinement within the TiO<sub>2</sub> films, thus increasing the overall performance of the cell.
    Language English
    Publishing date 2015-11-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.23.0A1642
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Structural control in porous/compact multilayer systems grown by magnetron sputtering.

    Garcia-Valenzuela, A / Lopez-Santos, C / Alvarez, R / Rico, V / Cotrino, J / Gonzalez-Elipe, A R / Palmero, A

    Nanotechnology

    2017  Volume 28, Issue 46, Page(s) 465605

    Abstract: In this work we analyze a phenomenon that takes place when growing magnetron sputtered porous/compact multilayer systems by alternating the oblique angle and the classical configuration geometries. We show that the compact layers develop numerous ... ...

    Abstract In this work we analyze a phenomenon that takes place when growing magnetron sputtered porous/compact multilayer systems by alternating the oblique angle and the classical configuration geometries. We show that the compact layers develop numerous fissures rooted in the porous structures of the film below, in a phenomenon that amplifies when increasing the number of stacked layers. We demonstrate that these fissures emerge during growth due to the high roughness of the porous layers and the coarsening of a discontinuous interfacial region. To minimize this phenomenon, we have grown thin interlayers between porous and compact films under the impingement of energetic plasma ions, responsible for smoothing out the interfaces and inhibiting the formation of structural fissures. This method has been tested in practical situations for compact TiO
    Language English
    Publishing date 2017-10-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/aa8cf4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Nanocolumnar association and domain formation in porous thin films grown by evaporation at oblique angles.

    Lopez-Santos, C / Alvarez, R / Garcia-Valenzuela, A / Rico, V / Loeffler, M / Gonzalez-Elipe, A R / Palmero, A

    Nanotechnology

    2016  Volume 27, Issue 39, Page(s) 395702

    Abstract: Porous thin films grown at oblique angles by evaporation techniques are formed by tilted nanocolumnar structures which, depending on the material type and growth conditions, associate along certain preferential directions, giving rise to large domains. ... ...

    Abstract Porous thin films grown at oblique angles by evaporation techniques are formed by tilted nanocolumnar structures which, depending on the material type and growth conditions, associate along certain preferential directions, giving rise to large domains. This arrangement, commonly denoted as bundling association, is investigated in the present work by performing fundamental experiments and growth simulations. It is proved that trapping processes of vapor species at the film surface, together with the shadowing mechanism, mediate the anisotropic widening of the nanocolumns and promote their preferential coalescence along certain directions, giving rise to domains with different shape and size. The role of these two processes is thoroughly studied in connection with the formation of these domains in materials as different as SiO2 and TiO2.
    Language English
    Publishing date 2016-09-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/0957-4484/27/39/395702
    Database MEDical Literature Analysis and Retrieval System OnLINE

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