Publicaciones Científicas Nanociencias y Materiales: Envíos recientes

Mostrando ítems 341-360 de 585

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Temperature dependence of sensors based on silver-decorated nitrogen-doped multiwalled carbon nanotubes 

      Gracia Espino, Edgar Eduardo; Rebollo Plata, Bernabé; Martinez Gutierrez, Hugo; Muñoz Sandoval, Emilio; López Urías, Florentino; Endo, Morinobu; Terrones Maldonado, Humberto; Terrones Maldonado, Mauricio (2016)
      "Vapor sensors are easily fabricated onto alumina substrates using foils of silver-decorated nitrogen-doped multiwalled carbon nanotubes (CNX-MWNTs-Ag) as active sensing material. The vapor sensors are tested using carbon ...

    • Loop formation in graphitic nanoribbon edges using furnace heating or Joule heating 

      Jia, Xiaoting; Campos Delgado, Jessica Rosaura; Gracia Espino, Edgar Eduardo; Hofmann, Mario; Muramatsu, Hiroyukim; Kim, Yoong Ahm; Hayashi, Takuya; Endo, Morinobu; Kong, Jing; Terrones Maldonado, Mauricio; Dresselhaus, Mildred (2009-07)
      "Here the authors report the use of either furnace heating or Joule heating to pacify the exposed graphene edges by loop formation in a novel graphitic nanoribbon material, grown by chemical vapor deposition. The edge ...

    • Recrystallization of a Ti-45Ni-5Cu cold-worked shape memory alloy characterized by thermoelectric power and electrical properties 

      Soto-Parra, Daniel Enrique; Flores Zúñiga, Horacio; López Cuéllar, Enrique Manuel; Ochoa-Gamboa, Raul Armando; Ríos Jara, David (2014)
      "The recrystallization of a cold-worked shape memory alloy (SMA) without R-phase transition, i.e. the Ti-45.0Ni-5.0Cu (% at.), has been studied by thermoelectric power (TEP) technique and electrical resistivity change (Dρ) ...