Materials Literature
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We have characterized the vertical transport properties of epitaxial layered structures composed of Pr0.7Ca0.3MnO3(PCMO) sandwiched between SrRuO3(SRO) bottom electrode and several kinds of top electrodes such as SRO, Pt, Au, Ag, and Ti. Among the layered structures, Ti∕PCMO∕SRO is distinct due to a rectifying I–V cha…
The electromagnetic theory of diffraction and the Babinet principle are applied to the design of artificial metasurfaces and metamaterials. A new particle, the complementary split rings resonator, is proposed for the design of metasurfaces with high frequency selectivity and planar metamaterials with a negative dielec…
Single-walled carbon nanotube (SWNT)/poly(methyl methacrylate) (PMMA) nanocomposites were prepared via our coagulation method providing uniform dispersion of the nanotubes in the polymer matrix. Optical microscopy, Raman imaging, and SEM were employed to determine the dispersion of nanotube at different length scales.…
Lead-free piezoelectric ceramics (1−x)(Na0.5K0.5)NbO3–xLiNbO3 {[Lix(Na0.5K0.5)1−x]NbO3} (x=0.04–0.20) have been synthesized by an ordinary sintering technique. The materials with perovskite structure is orthorhombic phase at x⩽0.05 and becomes tetragonal phase at x⩾0.07, a phase K3Li2Nb5O15 with tetragonal tungsten br…
Molecular and cellular MR imaging is a rapidly growing field that aims to visualize targeted macromolecules or cells in living organisms. In order to provide a different signal intensity of the target, gadolinium-based MR contrast agents can be employed although they suffer from an inherent high threshold of detectabi…
In 1955, a phenomenological theory of ferromagnetism was well established and had been corroborated by a considerable amount of experimental data. However, there were problems in the phenomenological theory of the dynamics of the magnetization field. The Landau-Lifshitz equation for damping of the motion of the magnet…
We derive an exact representation of the exchange-correlation energy within density functional theory (DFT) which spawns a class of approximations leading to correct long-range asymptotic behavior. In what amounts to be the simplest approximation, we obtain an electronic structure theory that combines a new local corr…
We have found CueO from Escherichia coli to have a robust cuprous oxidase activity, severalfold higher than any homologue. These data suggest that a functional role for CueO in protecting against copper toxicity in vivo includes the removal of Cu(I).
When a ferromagnet is in proximity with an antiferromagnet, lateral length scales such as the respective magnetic domain sizes drastically affect the exchange bias. Bilayers of FeF2 and either Ni, Co or Fe are studied using SQUID and spatially resolved MOKE. When the antiferromagnetic domains are larger than or compar…
A quantitative model of the rheology of fractionated short chain branched hyperbranched polyesters was developed. The two parameter Schulz-Zzimm were used where the parameters characterized the gamma function. The excellent fits to both the parent HBP and fractions implies that short chain branched HBPs are unentangle…
In this paper we discuss the glass transition and fragility of supercooled confined water. We have used vermiculite clay, a molecular sieve and purple membrane as host materials in order to obtain confinements that are severe enough to avoid crystallization of the water, even in the (for bulk water) experimentally ina…
The phase behaviour of water confined in porous Vycor glass is investigated by means of dielectric measurements. The effective static permittivity ε eff (0) of the sample, which consists of Vycor glass and water confined in the pores, is obtained over a wide range of temperature and pressure. The boiling point of the…
An amphiphilic surfactant, dodecylbenzenesulfonic acid (DBSA), was complexed with poly(ethylene oxide) (PEO) block in poly(1,4-butadiene)- block -PEO (PB- b -PEO) through hydrogen bonding to yield a molecular architecture resembling comb−coil diblock copolymer. For the two binding fractions ( x = 0.5 and 1.0 with x be…
The extent and locus of solubilization of guest and self-assembling surfactant host molecules in aqueous solutions are influenced by a variety of hydrophobic and hydrophilic interactions, as well as by more specific interactions between the various species present. By using a combination of two-dimensional heteronucle…
The structure and magnetocaloric effect (MCE) of rapidly quenched LaFe 11.4 Si 1.6 compound were investigated by means of x-ray diffraction analyses and magnetic measurements. The rapid quenching greatly facilitates the formation of the cubic La(Fe,Si) 13 (1:13 structure) in LaFe 11.4 Si 1.6 alloy. Rietveld analyses i…
The effect of salt concentration on the nanostructure of a spread monolayer of ionic amphiphilic diblock copolymer, (diethylsilacyclobutane)m-b-(methacrylic acid)n, at the air-water interface was directly investigated by in situ X-ray reflectivity and neutron reflectivity techniques. Previously, we had found that a po…
Se han preparado materiales hbridos por medio de reacciones de hidrlisis y condensacin de alcxidos de Si y Ti (TEOS y TBT, respectivamente) y de reacciones de copolimerizacin de stos con polidimetilsiloxano (PDMS). Se han estudiado las citadas reacciones mediante espectroscopia FT-IR, desde el mismo comienzo hasta la…
The thermal decomposition of methanol has been studied on TiO 2 (110) as well as on Cu and oxygen-covered Cu nanoclusters supported on TiO 2 (110) using temperature programmed desorption (TPD). The sizes of the Cu clusters were characterized by scanning tunneling microscopy (STM). Methanol chemistry on the vacuum-anne…
We address the question of the dependence of the fragility of glass forming supercooled liquids on the 'softness' of an interacting potential by performing numerical simulation of a binary mixture of soft spheres with different power n of the interparticle repulsive potential. We show that the temperature dependence o…
Sintering of supported nanocatalysts often leads to the loss of the catalytic activity and selectivity. This paper reports on synchrotron X-ray studies of the thermal stability of supported platinum nanoparticles produced by cluster deposition on the naturally oxidized surface of a silicon wafer (SiO 2 /Si(111)). The…