Materials Literature
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The technique of high-temperature oxidation tandem differential mobility analysis has been applied to the study of diesel nanoparticle oxidation. The oxidation rates in air of diesel nanoparticles sampled directly from the exhaust stream of a medium-duty diesel engine were measured over the temperature range of 800-11…
To investigate the luminescent and thermal properties of organic compounds with rigid entities, a series of new blue/purple luminescent bridging ligands, 4,4'-(N-7-azaindolyl)diphenylacetylene (5), 4-(N-7-azaindolyl)-4'-(2,2'-dipyridylamino)diphenylacetylene (6), 4,4'-(2,2'-dipyridylamino)diphenylacetylene (7), and 4,…
Sparse-matrix sampling using commercially available crystallization screen kits has become the most popular way of determining the preliminary crystallization conditions for macromolecules. In this study, the efficiency of three commercial screening kits, Crystal Screen and Crystal Screen 2 (Hampton Research), Wizard…
Abstract Blends of poly(ethylene terephthalate)/poly(ethylene 2,6‐naphthalene dicarboxylate) (PET/PEN) have exhibited properties that are of commercial interest to the packaging industry. Melt processing of PET with PEN results in transesterification reactions. The blend properties are controlled by the kinetics of th…
Five test structures (orthorhombic and trigonal trypsin, cubic and rhombohedral insulin and thaumatin) have been solved by the SAD (single-wavelength anomalous diffraction) method using highly redundant data collected at 100 K with a CCD detector, rotating-anode generator and three-circle goniometer. The very weak ano…
We have used a multi-technique approach to allow us to build a consistent picture of the carbons used for catalyst supports and suggest reasons for the differences between the supports. From the catalyst tests it is clear that the nature of the support has a major influence on the catalyst performance. In part, this i…
Abstract Electrically conductive resins can be made by adding electrically conductive fillers to typically insulating polymers. Resins with an electrical resistivity of approximately 10 0 Ω cm or less can be used for electromagnetic and radio frequency interference shielding applications. This research focused on perf…
Calculations for optical excitations in confined systems require knowledge of the inverse screening dielectric function ${ϵ}^{\ensuremath{-}1}(\mathbf{r},{\mathbf{r}}^{\mathbf{\ensuremath{'}}})$, which plays a crucial role in determining exciton binding energies. We present a new efficient real-space method of inverti…
Abstract In this work, heat‐shrinkable characteristics of a polyethylene compound were obtained by blending mixtures of low‐density polyethylene with varying amount of peroxide. These were then extruded and molded to the required shape and then cross‐linked by chemical means, followed by heating and stretching and the…
Films and 200-nm wire arrays of Bi 1- x Sb x alloys, one of the best known low-temperature thermoelectric materials, have been obtained by electrodeposition without the need for complexing the Sb cations in solution or further thermal treatment after deposition. The process consists of reduction of Bi 1- x Sb x direct…
Three problems involving heat transfer from a protein crystal to a cooling agent are analyzed: flash-cooling in a cold nitrogen- or helium-gas stream, plunge-cooling into liquid nitrogen, propane or ethane and crystal heating in a cold gas stream owing to X-ray absorption. Heat transfer occurs by conduction inside the…
The surface species formed during adsorption of NO, NO + O2 and NO2 on sodium and barium exchanged Y zeolites have been investigated by in situ IR spectroscopy. Ionically bound nitrates and nitrites on the exchanged metal cation sites are the main species formed during adsorption of NO and NO2. Extra framework alumina…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Novel One-Step Approach to Core-Stabilized Nanoparticles at High Solid ContentsDaoyong Chen, Huisheng Peng, and Ming JiangView Author Information Department of Macromolecular Science and The Key Laboratory of Molecular Engineering…
A series of poly{4‘-{( X -methacryloyloxyalkylene)methylamino}-4-nitroazobenzene} (p X MAN, where X is the number of methylene units and varies from 2 to 12) polymers with liquid crystalline (LC) properties was synthesized. When annealed above their T g values, the whole series of polymers exhibits a stable smectic A…
The phase diagram of the organic superconductor $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mathrm{C}\mathrm{u}[\mathrm{N}(\mathrm{C}\mathrm{N}{)}_{2}\mathrm{]}\mathrm{C}\mathrm{l}$ has been investigated…
A coassembly methodology was developed to synthesize ordered mesoporous silica materials containing gold nanoparticles. The essence of this methodology lies in the combination of the complexation-mediated growth of nanoparticles and surfactant-templating synthesis. The formation of nanoparticles was controlled by the…
The aging behavior of colloidal suspensions of laponite, a model synthetic clay, is investigated using light scattering techniques. In order to measure the complete dynamic structure factor as a function of time and of wave vector, we have developed an original optical setup using a multispeckle technique for simple l…
Antisites, carbon substitutionals, and vacancy defects in BN nanotubes have been investigated by first-principles total energy calculations, based on a density functional spin-polarized method. All defects introduce localized energy levels inside the band gap. For some open-shell systems (carbon substitutionals and va…
The reconstruction on Ge(001) surface is locally and reversibly changed between c(4x2) and p(2x2) by controlling the bias voltage of a scanning tunneling microscope (STM) at 80K. It is c(4x2) with the sample bias voltage V_b =< -0.7V. This structure can be kept with V_b =< 0.6V. When V_b is higher than 0.8V during the…
The microstructure and phase transition in relaxor ferroelectric $\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}$ (PMN) and its solid solution with ${\mathrm{PbTiO}}_{3}$ (PT), $\mathrm{PMN}\ensuremath{-}x\mathrm{PT},$ remain to be some of the most puzzling issues of solid-state science. In the pr…