Hyeon Suk Shin、Young Mee Jung、Tae Young Oh 等 7 位作者2002-06-26Langmuir
Temperature-dependent reflection−absorption Fourier transform infrared spectra of poly(methyl methacrylate) (PMMA) thin films were measured. From these spectra, two-dimensional (2D) maps of the first derivative of the absorbance with respect to temperature over the space of wavenumber and temperature were constructed.…
Glass properties and applicationsMaterial Dynamics and PropertiesPhotochemistry and Electron Transfer Studies
Zhongwu Wang、Surendra K. Saxena、Chang‐Sheng Zha2002-06-26Physical review. B, Condensed matter
In situ x-ray diffraction and Raman spectroscopy were used to explore the pressure-induced phase transformation of spinel ${\mathrm{Zn}}_{2}{\mathrm{TiO}}_{4}$ to pressures of 52.4 and 81.1 GPa, respectively. Results indicate that spinel ${\mathrm{Zn}}_{2}{\mathrm{TiO}}_{4}$ initially transforms to the orthorhombic $(…
Nuclear materials and radiation effectsFerroelectric and Piezoelectric MaterialsHigh-pressure geophysics and materials
Junying Zhang、Zhongtai Zhang、Zilong Tang 等 5 位作者2002-06-26Chemistry of Materials
BaMgAl 10 O 17:Eu 2+ phosphor powder was synthesized using a sol−gel process. Doping Er 3+ and Nd 3+ in the phosphor can increase the luminescent intensity of the phosphor in the VUV region. The BaMgAl 10 O 17:Eu 2+ phosphor crystallizes completely when the dried gel is calcined at 1300 °C. The BaMgAl 10 O 17:Eu 2+ ca…
Luminescence Properties of Advanced MaterialsRadiation Detection and Scintillator TechnologiesNuclear materials and radiation effects
Élodie Bourgeat‐Lami、Isabelle Tissot、F. Lefebvre2002-06-26Macromolecules
Polystyrene latex particles carrying silanol groups on their surface have been synthesized in emulsion polymerization using 3-(trimethoxysilyl)propyl methacrylate (MPS) as a functional comonomer. We showed that the colloidal stability of the resulting latex suspensions was highly dependent on pH and on the nature of t…
Polymer Surface Interaction StudiesMicrofluidic and Capillary Electrophoresis ApplicationsSurfactants and Colloidal Systems
Cristina Bena、Smitha Vishveshwara、Leon Balents 等 4 位作者2002-06-26Physical Review Letters
With the surge of research in quantum information, the issue of producing entangled states has gained prominence. Here, we show that judiciously bringing together two systems of strongly interacting electrons with vastly differing ground states-the gapped BCS superconductor and the Luttinger liquid-can result in quant…
Carbon Nanotubes in CompositesMechanical and Optical ResonatorsNanotechnology research and applications
Kikuo Harigaya2002-06-26arXiv
Optical excitations in hexagonal nanonetwork materials, for example, Boron-Nitride (BN) sheets and nanotubes, are investigated theoretically. The bonding of BN systems is positively polarized at the B site, and is negatively polarized at the N site. There is a permanent electric dipole moment along the BN bond, whose…
Chemical PhysicsStrongly Correlated ElectronsSoft Condensed Matterphysics.opticsMaterials Science
Jean-Christophe Baret、Damien Vandembroucq、Stephane Roux2002-06-26arXiv
An extremal model for the plasticity of amorphous materials is studied in a simple two-dimensional anti-plane geometry. The steady-state is analyzed through numerical simulations. Long-range spatial and temporal correlations in local slip events are shown to develop, leading to non-trivial and highly anisotropic scali…
Materials Sciencecond-mat.dis-nn
Jian-Xin Zhu、A. V. Balatsky2002-06-26arXiv
The Josephson current in the presence of a precessing spin between various types of superconductors is studied. It is shown that the Josephson current flowing between two spin-singlet pairing superconductors is not modulated by the precession of the spin. When both superconductors have equal-spin-triplet pairing state…
SuperconductivityMaterials Science
P. E. Kornilovitch、A. M. Bratkovsky、R. S. Williams2002-06-26arXiv
A simple experimentally accessible realization of current rectification by molecules (molecular films) bridging metal electrodes is described. It is based on the spatial asymmetry of the molecule and requires only one resonant conducting molecular level (pi-orbital). The rectification, which is due to asymmetric coupl…
Materials ScienceSoft Condensed Matter
D. T. Adroja、P. C. Riedi、J. G. M. Armitage 等 4 位作者2002-06-26arXiv
We have investigated a single crystal of CeAgSb2 using low field ac-susceptibility, thermal expansion and magnetostriction measurements in the temperature range 1.5K to 90K. The ac-susceptibility exhibits a sharp peak at 9.7K for both B//c and B perp c due to the magnetic ordering of the Ce moment. The thermal expansi…
Materials ScienceStrongly Correlated Electrons
G. Bilalbegovic2002-06-26arXiv
In the process of molecular dynamics simulation studies of gold nanowires an interesting structure is discovered. This is a finite double-wall nanowire with a large empty core similar to single-wall and double-wall carbon nanotubes. The structure of the 16-10 gold nanotube is studied at the room temperature. An invest…
Materials Science
Arno Schindlmayr2002-06-26arXiv
The good performance of the GW approximation for band-structure calculations in solids was long taken as a sign that the sum of self-energy diagrams is converged and that all omitted terms are small. However, with modern computational resources it has now become possible to evaluate self-consistency and vertex correct…
Materials Science
Carsten Zobel、M. Kriener、Donald G. Bruns 等 8 位作者2002-06-26OpenAlex
We present measurements of the magnetic susceptibility and of the thermal expansion of a ${\mathrm{LaCoO}}_{3}$ single crystal. Both quantities show a strongly anomalous temperature dependence. Our data are consistently described in terms of a spin-state transition of the ${\mathrm{Co}}^{3+}$ ions with increasing temp…
Advanced Condensed Matter PhysicsMagnetic and transport properties of perovskites and related materialsRare-earth and actinide compounds
D. Sauter、Markus Weinmann、Frank Berger 等 6 位作者2002-06-25Chemistry of Materials
Amorphous B−C−N ceramics were produced by thermolysis of poly(borosesquicarbodiimide) of idealized formula [B 2 (NCN) 3 ] n at 1100 °C in an argon atmosphere. Their structure was investigated by X-ray and neutron diffraction. Wide-angle diffraction showed that the ceramics consist of an amorphous structure with hexago…
Muon and positron interactions and applicationsBoron and Carbon Nanomaterials ResearchX-ray Diffraction in Crystallography
Liliana Yolanda Ancalla Dávila、Marília Caldas2002-06-25Journal of Computational Chemistry
Semiempirical Hartree-Fock techniques are widely used to study properties of long ring-structured chains, although these types of systems were not included in the original parametrization ensembles. These techniques are very useful for an ample class of studies, and their predictive power should be tested. We present…
Organic Light-Emitting Diodes ResearchConducting polymers and applicationsOrganic Electronics and Photovoltaics
Tianquan Lü、Wenwu Cao2002-06-25Physical review. B, Condensed matter
A generalized Ginzburg-Landau-Devonshire free energy has been used to describe the influence of imperfect surface layers or interface layers in ferroelectric thin films. The natural boundary condition has been employed in solving the polarization profile, which can reflect a more realistic situation compared to the pr…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesDielectric materials and actuators
Gloria Berlier、Takashi Yamamoto、Giuseppe Spoto 等 6 位作者2002-06-25Physical Chemistry Chemical Physics
The IR spectra of O3 adsorbed on polycrystalline (high surface area) MgO are reported and assigned. Two distinct groups of absorptions in the 1160–970 and 1730–1170 cm−1 spectral regions were observed. The bands falling in the first region, fully reversible upon decreasing the O3 pressure, are grouped into two doublet…
Luminescence Properties of Advanced MaterialsGas Sensing Nanomaterials and SensorsCatalytic Processes in Materials Science
Gabriel C. Ossenkamp、Tim Kemmitt、Jim H. Johnston2002-06-25Langmuir
Three aspects of the esterification reaction of silica surfaces with alcohols that are relevant for the synthesis of functional materials have been studied: surface coverage, hydrolytic stability, and the introduction of functional groups. The chemisorption of alcohols on silica can be described by the Langmuir adsorp…
Molecular Junctions and NanostructuresMesoporous Materials and CatalysisCatalysis and Oxidation Reactions
Swetlana Schauermann、Jens Hoffmann、Viktor Johánek 等 5 位作者2002-06-25Physical Chemistry Chemical Physics
We have investigated the adsorption, decomposition and oxidation of methanol on a well-defined supported Pd model catalyst, utilizing a combination of molecular beam methods, reflection absorption IR spectroscopy (RAIRS) and temperature-programmed desorption (TPD). The Pd model catalyst is prepared under ultrahigh-vac…
Catalysts for Methane ReformingCatalytic Processes in Materials ScienceCatalysis and Oxidation Reactions
Bryce Sadtler、Alexander Wei2002-06-25Chemical Communications
Core-shell ensembles of citrate-stabilized gold nanoparticles (20-80 nm) on submicron silica cores (330-550 nm) have been prepared by electrostatic self-assembly with shell packing densities as high as phi = 0.55.
Nanocluster Synthesis and Applicationsnanoparticles nucleation surface interactionsGold and Silver Nanoparticles Synthesis and Applications