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。
Abstract Density functional theory (DFT) was employed to evaluate the heats of formation (HOFs) for hexaazaadamantane (HAA) derivatives with CN, NC, and ONO 2 groups, respectively. This was done by designing isodesmic reactions at the B3LYP/6‐31G* level of theory, where the HAA cage skeletons were kept unbroken to…
The first nonsymmetric liquid crystal dimers, possessing salicylaldimine and cyanobiphenyl rodlike anisometric segments, exhibiting the biaxial smectic A (McMillan) phase unequivocally evidenced by microscopic, conoscopic, calorimetric and X-ray diffraction studies is reported.
Single-chamber solid oxide fuel cells (SC-SOFCs) rely on the selectivity of the anode and cathode materials for either the partial oxidation reaction of a hydrocarbon with oxygen from air (anode) or the oxygen reduction reaction (cathode). The observed open-circuit voltages (OCVs) of up to measured in SC-SOFCs suggest…
An estimation of the fraction of Cr(II) sites involved in the C(2)H(4) polymerization on a Cr(II)/SiO(2) Phillips catalyst has been obtained by means of in situ alternated CO adsorption and C(2)H(4) polymerization FTIR experiments: about 28% of the total surface sites react fast with C(2)H(4), while a lower fraction,…
Recently, Chen et al. [J. Biomed. Opt. Vol. 10, 024005 (2005)] reported on the concept of multicolor molecular imaging, which uses resonant light-scattering spectroscopy of multilayer nanospheres. They claimed that the resonance scattering peaks of three-layer nanoshells can be designed so that the ultrasharp widths a…
New macromolecular self-assembling building blocks, dendron-helical polypeptide copolymers, have been synthesized; these materials possess a well-defined 3-D shape and self-assemble in solution to form nanoribbon and lyotropic liquid crystalline phases.
Silica-based mesoporous materials have been employed as the support host for a suitably designed small octanuclear nickel(II) guest complex with a moderately anisotropic S = 4 ground spin state (D = −0.23 cm−1), which behaves as a single-molecule magnet at low temperature (TB = 3.0 K). Both unimodal MCM-41 and bimodal…
The present work describes a series of H-bonded complexes consisting of a melamine derivative and polycatenar acids that show columnar liquid crystalline behaviour. Chirality has been transferred from the molecular blocks (either the acids, A3* and A4*, or the melamine, T2*) to the columnar organization. Particular ef…
Fuel cells (FCs) are static energy conversion devices that convert the chemical energy of fuel directly into DC electrical energy. Among several types of fuel cells, solid oxide fuel cells (SOFC), polymer electrolyte membrane fuel cells (PEMFC) and molten carbonate fuel cells (MCFC) show great promise for distributed…
This paper is dedicated to Pedro Rivas, a pioneer in the study of some of the issues herein presented and the head of many of the research projects compiled. He has participated intensely in all the described investigations. The useful suggestions and comments from the referees A. Meunier and R. Pusch have improved th…
Luminescence properties of CdSiO 3 :Pb 2+ long-afterglow phosphor, including photoluminescence, fluorescence lifetime, long-afterglow decay curve, and thermostimulated luminescence spectra, are investigated in this paper. Photoluminescence of the synthesized phosphor shows a single intense Pb 2+ -related broadband emi…
The integral equation method for the simulation of the diffraction by optical gratings is an efficient numerical tool if profile gratings determined by simple cross-section curves are considered. This method in its recent version is capable to tackle profile curves with corners, gratings with thin coated layers, and d…
The plastics business is gathering around nanocomposites because of the unusual performance of these materials in some technologically important applications, such as automotive parts, packaging, textiles and flame resistant materials. The use of clay as the reinforcing component of polymers has transformed the proper…
Dissolution is a characterization test commonlyused by the pharmaceutical industry to guideformulation design and control product quality. Often, it is a required performance test for solid dosage forms,transdermal patches,and suspensions. It is also the only test that measures the
Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000 g⋅mol -1 and narrow polydispersities were grown from the surface of silica nanoparticles (Aerosil A200 fumed silica and Stöber silica, resp.) through nitroxide‐mediated polymerization (NMP). Alkoxyamine initiators based on N‐tert‐butyl‐1‐d…
Reactive hot pressing is discussed as a processing method to form ceramic‐based materials. Fundamental aspects of thermodynamics such as favorable Gibbs'‐free energy changes, phase equilibria, and adiabatic temperature are presented as criteria for determining whether the desired reactions can be used to form dense ma…
Research Article| January 01, 2006 Analysis of Disordered Materials Using Total Scattering and the Atomic Pair Distribution Function Thomas Proffen Thomas Proffen Lujan Neutron Scattering Center Los Alamos National Laboratory Los Alamos, New Mexico, 87545, U.S.A. LA-UR 06-0622, e-mail: tproffen@lanl.gov Search for oth…
X-ray-tomography was used to investigate the moisture distribution of multilayered textiles under praxis conditions. It was possible to follow the dynamics of the moisture transport without disturbing an ensemble during measurement, and to make quantitative statements concerning the localization of the moisture, both…
Reactions of 3,4-dimethyl-3',4'-bis(diphenylphosphino)tetrathiafulvalene, o-P2, with [BF(4)](-) salts of Fe(ii), Co(ii), Ni(II), Pd(II), and Pt(II) yield complexes of general formula [M(o-P2)(2)][BF(4)](2). Similar reactions between o-P2 and AgSbF(6) or AgPF(6) produced the salts [Ag(o-P2)(2)][X] where X = [SbF(6)](-)…
Dendritic-helical diblock copolypeptides, dendritic poly(-lysine)--poly(γ-benzyl--glutamate) (PBLG-Lys) were synthesized up to 4th generation of dendritic poly(-lysine). PBLG was synthesized by conventional ring-opening polymerization of γ-benzyl--glutamate--carboxyanhydride with heptyl amine as an initiator. The -ter…