Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We use the finite lattice method to count the number of punctured staircase and self-avoiding polygons with up to three holes on the square lattice. New or radically extended series have been derived for both the perimeter and area generating functions. We show that the critical point is unchanged by a finite number o…
We present a combined experimental and theoretical study of memory effects in vibration-induced compaction of granular materials. In particular, the response of the system to an abrupt change in shaking intensity is measured. At short times after the perturbation a granular analog of aging in glasses is observed. Usin…
Local ultrafast optical excitation of electron-hole pairs in disordered semiconductors provides the possibility to observe experimentally interaction-assisted propagation of correlated quantum particles in a disordered environment. In addition to the interaction driven delocalization known for the conventional single-…
Using a scattering technique based on a parametrized linear combination of atomic orbitals Hamiltonian, we calculate the ballistic quantum conductance of multiwall carbon nanotubes. We find that interwall interactions not only block some of the quantum conductance channels, but also redistribute the current nonuniform…
Thermal convection is observed in molecular dynamic simulation of a fluidized granular system of nearly elastic hard disks moving under gravity, inside a rectangular box. Boundaries introduce no shearing or time dependence, but the energy injection comes from a slip (shear-free) thermalizing base. The top wall is perf…
A giant level shift, resulted from the interaction of an electron in a spherical quantum dot with zero--point oscillations of confined modes of the electric field, is divulged. The energy correction depends on the dot radius. This size scaling of the depolarisation effect is computed semiclassically. A change of the o…
Previous studies by the authors and their co-workers show that the structure of equations representing shape Memory Alloy (SMA) constitutive behaviour can be very similar to those of rate-independent plasticity models. For example, the Boyd–Lagoudas polynomial hardening model has a stress-elastic strain constitutive r…
Coulometric nanotitrations were realized in a microchannel system using a continuous-flow titration technique with a triangle current-time profile. Redox and acid-base titrations were carried out on Fe(II) and nitric acid samples, respectively, with the same nanotitrator device. A linear relation between the concentra…
The structure of lanthanide-doped (La, Sm, and Ce) V 2 O 5 /Al 2 O 3 catalysts for the Selective Catalytic Reduction (SCR) of NO x with NH 3 in the presence of O 2 have been studied by means of XRD, S BET, XAS, UV−vis, XPS, and TPR techniques. As function of the vanadium loading and lanthanide dopant used, an alterati…
Diameter distributions of single-wall carbon nanotubes (SWNTs) produced by an arc discharge with a Rh−Pt catalyst at various helium pressures from 50 to 1520 Torr were studied by transmission electron microscopy and Raman scattering spectroscopy. The distribution shifted systematically to small diameter with the decre…
Cubic solid solutions of general formula Ce 1 - x M x O 2 (M = Zr, Th, Hf) have been modeled in the range (0 < x < 1) using atomistic simulation methods. The Ce 4+ /Ce 3+ reduction energy in the bulk materials and the activation energy for oxygen migration have been calculated. The Ce 4+ /Ce 3+ reduction energy decrea…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanopattern Formation from Tethered PS-b-PMMA Brushes upon Treatment with Selective SolventsBin Zhao, William J. Brittain, Wensheng Zhou, and Stephen Z. D. ChengView Author Information Department of Polymer Science The University of Akron, Akron, Ohio 44325-3909 Cite t…
Adsorption and reaction of NO on the (5 × 20)-Pt(100) surface and two Sn/Pt(100) surface alloys have been studied using temperature programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). On the (5 × 20)-Pt(100) surface, in the absence of Sn, NO is primarily reversibly adsorbed, and…
Surface modification of CeO 2 −ZrO 2 solid solutions took place using formation and transport of volatile vapor complexes such as AlCl 3 −CeCl 3 and AlCl 3 −ZrCl 4, which was denoted as “chemical filing.” XPS analysis showed surface Ce enrichment, and transmission electron microscopy and Raman spectra revealed that a…
This presentation summarizes efforts to develop and apply chemically bonded phosphate ceramic (Ceramicrete{trademark}) technology for radiation shielding applications. The specific application being targeted is a packaging system for spent-fuel transport and storage. Using Ceramicrete technology under ambient conditio…
Single-crystal X-ray analyses of oligomeric models for high-performance aromatic polymers, interfaced to computer-based molecular modeling and diffraction simulation, have enabled the determination of a range of previously unknown polymer crystal structures from X-ray powder data. Materials which have been successfull…
Polycondensation reactions of optically active ( S, S )-1,3-dimethyl-1,3-diphenyldisiloxanediol [( S, S ):( S, R ):( R, R ) = 86:14:0] with bis(dimethylamino)dimethylsilane and bis(dimethylamino)diphenylsilane were carried out to give stereoregular and optically active polysiloxanes. The stereoregularity of the polysi…
Carbonate is generally a strongly complexing ligand for f-element ions, including trivalent lanthanides. The few lanthanide(III) carbonates previously characterized have extended multidimensional solid state structures. Spectroscopic and solubility studies indicate that the solution species are monomeric; however, str…
Two different synthetic routes for the formation of sodium phenylsiloxanolate (SPS) have been developed: (i) the cleavage of oligo(phenylsilsesquioxane), OPSSO, by NaOH in n -butyl alcohol and (ii) the reaction of phenyltri- n -butoxysilane, PhSi( n -BuO) 3, and NaOH in n -butyl alcohol in the presence of water. From…
A systematic approach is proposed to structural characterization of templated nanoporous materials with cubic symmetry by gas adsorption. We hypothesize that regular structures of these materials can be described in terms of triply periodic minimal surfaces (TPMS), similarly to bicontinuous mesophases observed in oil−…