Materials Literature
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Many metastable complex fluids such as colloidal glasses and gels show distinct nonlinear viscoelasticity with increasing oscillatory-strain amplitude; the storage modulus decreases monotonically as the strain amplitude increases whereas the loss modulus has a distinct peak before it decreases at larger strains. We pr…
Soft and transparent polymer–clay nanocomposites (see figure), consisting of hydrophobic poly(2-methoxyethylacrylate) and hydrophilic inorganic clay, with a unique clay-network morphology have been synthesized by in situ free-radical polymerization. The nanocomposites exhibit the first observation of abnormal necking…
Producing densely packed arrays of nanoscopic anisotropic objects, while necessary for applications in photovoltaic and field emission devices, presents considerable challenges. Here, we present findings on the phase separation of ligand-functionalized nanorods in a polymer matrix under an applied electric field. Dens…
A 1D periodic structure of ferroelectric domains in epitaxial BiFeO3 films is created. By careful control of the growth mechanism for the SrRuO3 bottom electrode, its in-plane lattice parameters are confined by the underlying DyScO3 (110)O single- crystal substrate, enabling the formation of an expitaxial film of (110…
Femtosecond time-resolved photoemission is used to investigate the time evolution of electronic structure in the Mott insulator 1T-TaS2. A collapse of the electronic gap is observed within 100 femtoseconds after optical excitation. The photoemission spectra and the spectral function calculated by dynamical mean field…
Collagen is a protein material with superior mechanical properties. It consists of collagen fibrils composed of a staggered array of ultra-long tropocollagen (TC) molecules. Theoretical and molecular modeling suggests that this natural design of collagen fibrils maximizes the strength and provides large energy dissipa…
Abstract Megawatt ArF laser photolysis of gaseous methyldisilazanes [(CH 3 ) n H 3− n Si] 2 NH ( n = 2, 3) in excess of Ar yields hydrocarbons (major volatile products), methylsilanes (minor volatile products) and allows chemical vapour deposition of solid amorphous Si/C/O/N/H powder containing SiX (XC, H, O, N) bon…
The authors report on an intense blue emission centered at 420nm under ultraviolet excitation from pentavalent tantalum ion-doped silicate glasses. The blue emission is distinctly different from emission due to defects in silica glass, which is also reflected in both absorption spectrum and remarkably enhanced emissio…
A combined study of the magnetic properties of GdCrO4 , Jiménez-Melero, E, Gubbens, P C M, Steenvoorden, M P, Sakarya, S, Goosens, A, Réotier, P Dalmas de, Yaouanc, A, Rodríguez-Carvajal, J, Beuneu, B, Isasi, J, Sáez-Puche, R, Zimmerman, U, Martínez, J L
This paper involves the formulation of the C 0 finite elements incorporating the conventional mechanism-based strain gradient plasticity theory. Higher-order variables and consequently higher-order continuity conditions are not required allowing the direct applications of conventional plasticity algorithms in the exis…
The authors describe the operation of an electro-optical photoluminescence quenching device based on CdSe nanoclusters formed using sequential ion implantation of Cd+ and Se+ in thermally grown SiO2 on silicon. A sample geometry consisting of a semitransparent gold electrode on top and an ohmic contact to the p-doped…
A technique for direct experimental investigations of coupling between applied elastic stress and magnetic response in ferromagnetic shape memory alloys over the temperature ranges of paramagnetic to ferromagnetic and martensitic transformations has been developed, based on the inverse magnetostriction (Villary) effec…
A method of annealing thin films of indium tin oxide in vacuum is proposed using a direct electric current flow through the film. During annealing at a constant electric power, the film resistance, free electron density, and structure evolution were monitored in situ. In comparison with the conventional isothermal ann…
The authors have studied nonradiative energy transfer between semiconductor nanocrystals (NCs) placed in a Fabry-Pérot microcavity. The spectrally integrated fluorescence from a monolayer of single sized NCs in the cavity is enhanced by a factor of 4.8 compared to free space. For a monolayer of mixed sized NCs, the ac…
A new approach is presented for modeling perovskite frameworks with disordered Jahn-Teller (JT) distortions and has been applied to study the elastic response of the LaMnO3 structure to defects in the JT ordering. Surprisingly, antiphase domain boundary defects in the pattern of ordered JT octahedra, along the [110] a…
A novel high mobility transparent conductive oxide thin film, tungsten-doped indium oxide (IWO), has been successfully grown on conventional glass substrates by reactive direct current magnetron sputtering technique from a metallic target. Analyses of x-ray photoelectron spectroscopy and x-ray diffraction reveal that…
Ceria, CeO2, based materials are a major (active) component of exhaust catalysts and promising candidates for solid oxide fuel cells. In this capacity, oxygen transport through the material is pivotal. Here, we explore whether oxygen transport is influenced (desirably increased) compared with transport within the bulk…
The Landau-Ginzburg-Devonshire theory is used to study the effects of the strain gradient due to the epitaxial stresses in ferroelectric thin films sandwiched between two different substrates. The polarization in the film is found to be nonuniform, resulting in charge offsets and an asymmetric hysteresis response with…
A method is presented for quantifying oxygen diffusion behavior in a nanodevice fabricated using individual ZnO nanowire/nanobelt. A nanodevice was built using a single nanobelt. Defects are introduced into nanobelt during specific nanofabrication procedure. Then, after the device being exposed to atmosphere for sever…
This letter reports a study of charge distribution on single-walled carbon nanotubes. An atomistic moment method is proposed based on classical electrostatics theory and the results of analysis are compared with those obtained from ab initio approach. It is shown that the classical electrostatics is applicable to solv…