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。
The synthesis of amphiphilic AB block copolymers, having 1,4-polydiene or corresponding hydrogenated aliphatic polyolefin blocks and poly(ethylene oxide) (PEO) blocks, is described. The materials are obtained in a two-step process. In the first step isoprene is polymerized anionically in a hydrocarbon solvent with sec…
A photoisomerizable nitrospiropyran monolayer assembled on a Au electrode provides a functionalized interface for the photochemical, pH, and thermal control of electrochemical processes of charged electroactive redox probes. (Mercaptobutyl)nitrospiropyran 1 was assembled as a monolayer on a Au electrode. The monolayer…
This review focuses on the use of heterogeneous catalysts in the production of fine and speciality chemicals. The major emphasis is on those systems which have been commercialised already and those which are close to commercialisation. These include the use of TS-1 for oxidation reactions including the production of h…
Several edible films based on methylcellulose and polyethylene glycol 400 (PEG400) were prepared and stored until equilibration at different relative humidities. Tensile stress−strain curves show very different behaviors as a function of PEG400 and relative humidity. Tensile strength strongly depends on relative humid…
The present analysis provides Tb(0.27−0.30)Dy(0.73−0.70)Fe(1.9−2.0) magnetization and magnetostriction states during applied magnetic field and stress processes by minimizing the total magnetic free energy in the presence of a parameter selected inverse exponential magnetic free energy distribution. A comparison betwe…
The entropic depletion force, in colloids, arises when large particles are placed in a solution of smaller ones, and sterically constrained to avoid them. In this paper, we consider a system of two parallel plates suspended in a semidilute solution of long thin rods of length L and diameter D. By numerically solving a…
Zinc oxide-silicon heterojunctions were fabricated using both n- and p-type silicon. The zinc oxide films were deposited by the magnetron sputtering process at various substrate temperatures to form these devices. The electrical properties of these devices were measured and the work function of the zinc oxide was eval…
A highly pure mixture of carbon and silica was obtained on pyrolysis rice husk leached with acid at high temperature in a nonoxidizing atmosphere. The product was suitable for use as a starting material in the the manufacture of silicon nitride powder. The effect of treatment including the kind and concentration of ac…
PROBLEM: Heart valve replacement with either a nonliving xenograft or a mechanical prosthesis is an effective therapy for valvular heart disease. Both of these approaches have limitations, including their inability to grow, repair, and remodel. In addition, a mechanical prosthesis requires long-term anticoagulation th…
The entropically based nonlinear Adam-Gibbs equation is discussed in the context of phenomenologies for nonlinear enthalpy relaxation within the glass transition temperature range. In many materials for which adequate data are available, the nonlinear Adam-Gibbs parameters are physically reasonable and agree with thos…
The phase stability of the subsolidus region in the composition regime SrO–SrTiO3 has been studied using a combination of atomistic computer simulation techniques and high-resolution electron microscopy (HREM). Both predictions from atomistic calculations and HREM observations suggest that at low concentrations (less…
A new nanofabrication procedure has been developed for making thermocouple probes for high-resolution scanning thermal microscopy. Thermocouple junctions were placed at the end of SiNx cantilever probe tips and were typically 100–500 nm in diameter. Cantilever bending due to thermal expansion mismatch was minimized fo…
An extensive photoelectron spectroscopic study on the CuO x - ( x = 0−6) species is presented. The photoelectron spectra of these species are obtained at four detachment photon energies: 2.33, 3.49, 4.66, and 6.42 eV. The spectra of the copper atom are included to show the dependence of the detachment cross sections o…
This paper presents a detailed study of boron nitride modifications at hydrostatic pressures. Cohesive properties of zinc blende (c-BN), wurtzite (w-BN), hexagonal (h-BN), rhombohedral (r-BN), and rocksalt structure are calculated by systematic optimization of unit cell parameters and atomic positions using total-ener…
Bulk, single crystal, and metal-organic chemical-vapor deposition thin-film samples of ${\mathrm{Gd}}_{0.67}$ ${\mathrm{Ca}}_{0.33}$ ${\mathrm{MnO}}_{3}$ were prepared and examined for their electrical, magnetic, and structural properties. ${\mathrm{Gd}}_{0.67}$ ${\mathrm{Ca}}_{0.33}$ ${\mathrm{MnO}}_{3}$ is ferrimagn…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAssembly of Latex Particles by Using Emulsion Droplets. 3. Reverse (Water in Oil) SystemO. D. Velev and K. NagayamaView Author Information Nagayama Protein Array Project, ERATO, JRDC, 5-9-1 Tokodai, Tsukuba, 300-26 Japan Cite this: Langmuir 1997, 13, 6, 1856–1859Publication Dat…
The sol-gel transition in a suspension of monodisperse, charged, disklike platelets (Laponite, i.e., a synthetic clay) is examined within a simplified statistical model. The initial ``primitive'' model of uniformly charged disks surrounded by microscopic co ions and counterions is reduced to a model of nonintersecting…
Ytterbium oxide (Yb 2 O 3 ) was used as a sintering aid to enhance the mechanical properties of silicon nitride (Si 3 N 4 ) ceramics. The amount of Yb 2 O 3 had significant effects on microstructural evolution and the composition of secondary phases at the grain boundary. When the Yb 2 O 3 added was less than 8 wt%, s…
Abstract Short term shearing at low degrees of supercooling with subsequent monitoring of the crystallization process of iso-tactic polypropylenes leads to highly oriented surface layers and fine grained layers that reach further into the core of the solidified samples. This process is highly dependent on the content…
Miniaturization and silicon integration of micro enzyme reactors for applications in micro total analysis systems (µTASs) require new methods to achieve structures with a large surface area onto which the enzyme can be coupled. This paper describes a method to accomplish a highly efficient silicon microstructured enzy…