División de Nanociencias y Materiales: Envíos recientes

Mostrando ítems 341-360 de 588

    • Photoanodes modified with reduced graphene oxide to enhance photoelectrocatalytic performance of B-TiO2 under visible light 

      Gualdrón Reyes, Andrés Fabián; Meléndez, Angel M.; Niño Gómez, Martha Eugenia; Rodríguez González, Vicente; Carreño Lizcano, María Isabel (2015)
      "The effect of reduced graphene oxide (rGO) content in boron-modified TiO2 nanocrystalline films on their photocatalytic activity in phenol oxidation is investigated. Visible-light-active TiO2 modified photoanodes were ...

    • Magnetocaloric effect in nanostructured Pr2Fe17 and Nd2Fe17 synthesized by high-energy ball-milling 

      Álvarez Alonso, Pablo; Sánchez Marcos, Jorge; Sánchez Llamazares, José Luis; Franco, Victorino; Reiffers, Marian; Blanco Rodríguez, Jesús Angel; Gorria, Pedro (2010-11)
      "Nanocrystalline Pr2Fe17 and Nd2Fe17 powders with rhombohedral Th2Zn17-type crystal structure and average particle sizes around 20 nm have been obtained by high-energy ball milling While the bulk alloys show a well-defined ...

    • Direct imaging of phase objects enables conventional deconvolution in bright field light microscopy 

      Hernández Candia, Carmen Noemí; Gutiérrez Medina, Braulio (2014-02)
      "In transmitted optical microscopy, absorption structure and phase structure of the specimen determine the three-dimensional intensity distribution of the image. The elementary impulse responses of the bright field microscope ...

    • Ultrastructural analysis of Candida albicans when exposed to silver nanoparticles 

      Vázquez Muñoz, Roberto; Ávalos Borja, Miguel; Castro Longoria, Ernestina (2014-10)
      "Candida albicans is the most common fungal pathogen in humans, and recently some studies have reported the antifungal activity of silver nanoparticles (AgNPs) against some Candida species. However, ultrastructural analyses ...

    • SERS properties of different sized and shaped gold nanoparticles biosynthesized under different environmental conditions by Neurospora crassa extract 

      Quester, Katrin; Ávalos Borja, Miguel; Vilchis Nestor, Alfredo Rafael; Camacho-López, Marco Antonio; Castro Longoria, Ernestina (2013-10)
      "Surface-enhanced Raman scattering (SERS) is a surface-sensitive technique that enhances Raman scattering by molecules adsorbed on rough metal surfaces. It is known that metal nanoparticles, especially gold and silver ...

    • Magnetovolume and magnetocaloric effects in Er2Fe17 

      Álvarez Alonso, Pablo; Gorria, Pedro; Blanco Rodríguez, Jesús Angel; Sánchez Marcos, Jorge; Cuello, Gabriel J.; Puente Orench, Inés; Rodríguez Velamazán, José Alberto; Garbarino, Gastón; De Pedro, Imanol; Rodríguez Fernández, Jesús; Sánchez Llamazares, José Luis (2012-11)
      "Combining different experimental techniques, investigations in hexagonal P6(3)/mmc Er2Fe17 showremarkable magnetovolume anomalies below the Curie temperature, T-C. The spontaneous magnetostriction reaches 1.6 x 10(-2) at ...

    • Statistical similarity between the compression of a porous material and earthquakes 

      Baró, Jordi; Corral, Alvaro; Illa, Xavier; Planes, Antoni; Salje, Ekhard K. H.; Schranz, Wilfried; Soto-Parra, Daniel Enrique; Vives, Eduard (2013-02)
      "It has long been stated that there are profound analogies between fracture experiments and earthquakes; however, few works attempt a complete characterization of the parallels between these so separate phenomena. We study ...

    • A minimal optical trapping and imaging microscopy system 

      Hernández Candia, Carmen Noemí; Tafoya Martínez, Sara (2013-02)
      "We report the construction and testing of a simple and versatile optical trapping apparatus, suitable for visualizing individual microtubules (similar to 25 nm in diameter) and performing single-molecule studies, using a ...

    • Observation of magnetic edge state in graphene nanoribbons 

      Joly, V. L.Joseph; Kiguchi, Manabu; Hao, Sijia; Takai, Kazuyuki; Enoki, Toshiaki; Sumii, Ryouhei; Amemiya, Kenta; Muramatsu, Hiroyukim; Hayashi, Takuya; Kim, Yoong Ahm; Endo, Morinobu; Campos Delgado, Jessica Rosaura; López Urías, Florentino; Botello Méndez, Andrés Rafael; Terrones Maldonado, Humberto; Terrones Maldonado, Mauricio; Dresselhaus, Mildred (2010-06)
      "The electronic structure and spin magnetism for few-layer-graphene nanoribbons synthesized by chemical vapor deposition have been investigated using near-edge x-ray absorption fine structure (NEXAFS) and electron-spin ...

    • Caloric effects induced by magnetic and mechanical fields in a Ni50Mn25-xGa25Cox magnetic shape memory alloy 

      Castillo Villa, Pedro Osmany; Soto-Parra, Daniel Enrique; Matutes Aquino, José Andrés; Ochoa-Gamboa, Raul Armando; Planes, Antoni; Mañosa, Lluis; González Alonso, David; Stipcich, Marcelo; Romero, Ricardo; Ríos Jara, David; Flores Zúñiga, Horacio (2011-05)
      "We have studied the elastocaloric effect in a Co-doped Ni-Mn-Ga magnetic Heusler shape memory alloy in the vicinity of its martensitic transition. Measurements of the length change as a function of temperature have been ...

    • Generalizing segregation and chemical ordering in bimetallic nanoclusters through atomistic view points 

      Reyes Nava, Juan Andrés; Rodríguez López, José Luis; Umapada Pal (2009-10)
      "We predict general trends for surface segregation in binary metal clusters based on the difference between the atomic properties of the constituent elements. The energetically most favorable site for a guest atom on a ...

    • Two-dimensional tunneling in a SQUID 

      Ivlev, Boris; Palomares Báez, Juan Pedro (2010-11)
      "Traditionally quantum tunneling in a superconducting quantum interference device (SQUID) is studied on the basis of a classical trajectory in imaginary time under a two-dimensional potential barrier. The trajectory connects ...

    • Effect of packing on the cohesive and electronic properties of methanofullerene crystals 

      Nápoles Duarte, José Manuel; Reyes Reyes, Marisol; Ricardo Chávez, José Luis; Garibay Alonso, Raúl; López Sandoval, Román (2008-07)
      "The crystal structure, cohesive energy, and electronic properties of bulk phases of the fullerene derivative [6, 6]-phenyl-C(61)-butyric-acid-methyl-ester (PCBM) have been calculated using ab initio density-functional ...

    • Intertwined magneto-optical and plasmonic effects in Ag/Co/Ag layered structures 

      Ferreiro Vila, Elías; González Díaz, Juan B.; Fermento, Rui; González, María Ujué; García Martín, Antonio; García Martín, José Miguel; Cebollada, Alfonso; Armelles, Gaspar; Meneses Rodríguez, David; Muñoz Sandoval, Emilio (2009-09)
      "Surface plasmon polariton (SPP) excitation effects on the magneto-optical (MO) activity of Au capped Ag/Co/Ag trilayers are studied as a function of Co thickness. An enhancement of the transverse MO Kerr signal under SPP ...

    • Raman spectroscopy study of heat-treated and boron-doped double wall carbon nanotubes 

      Villalpando Paez, Federico; Son, Hyungbin; Chou, Shin Grace; Samsonidze, Georgy G.; Kim, Yoong Ahm; Muramatsu, Hiroyukim; Hayashi, Takuya; Endo, Morinobu; Terrones Maldonado, Mauricio; Dresselhaus, Mildred (2009-07)
      "We performed Raman spectroscopy experiments on undoped and boron-doped double walled carbon nanotubes (DWNTs) that exhibit the "coalescence inducing mode" as these DWNTs are heat treated to temperatures between 1200 C and ...

    • Wave transmission through periodic, quasiperiodic, and random one-dimensional finite lattices 

      Gutiérrez Medina, Braulio (2013-02)
      "The quantum mechanical transmission probability is calculated for one-dimensional finite lattices with three types of potentials: periodic, quasiperiodic, and random. When the number of lattice sites included in the ...

    • Hybridization vs. bond stretching isomerism in Ru(II) cyclometalated complexes of 2-phenylpyridine 

      Molina, Bertha; Alexandrova, Larissa; LeLagadec, Ronan; Sansores Cuevas, Luis Enrique; Ríos Jara, David; Espinosa Magaña, Francisco; Salcedo, Roberto (MDPI, 2012-01)
      "The phenomenon of formation of two isomers, yellow and orange, of the cyclometalated Ru(II) complex, [Ru(o-C6H4-py)(MeCN)4]+, was investigated by EELS spectroscopy and theoretical calculations. Both forms show very similar ...

    • Pure and doped boron nitride nanotubes 

      Terrones Maldonado, Mauricio; Romo Herrera, José Manuel; Cruz Silva, Eduardo; López Urías, Florentino; Muñoz Sandoval, Emilio; Velázquez Salazar, J. Jesús; Terrones Maldonado, Humberto; Bandô, Yoshio; Golberg, Dmitri (2007-05)
      "More than ten years ago, it was suggested theoretically that boron nitride (BN) nanotubes could be produced. Soon after, various reports on their synthesis appeared and a new area of nanotube science was born. This review ...

    • Competing magnetic structures and magnetic transitions in Er(2)Ni(2)Pb: powder neutron diffraction measurements 

      Muñoz Sandoval, Emilio (2008-07)
      "We have studied the magnetic structures of Er(2)Ni(2)Pb using a powder neutron diffraction technique in zero field. Previous bulk measurements suggested three distinct magnetic phase transitions. Our neutron diffraction ...

    • Enhanced tunneling through nonstationary barriers 

      Palomares Báez, Juan Pedro; Ivlev, Boris; Rodríguez López, José Luis (2007-11)
      "Quantum tunneling through a nonstationary barrier is studied analytically and by a direct numerical solution of Schrödinger equation. Both methods are in agreement and say that the main features of the phenomenon can be ...