Materials Literature
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Chemical architectures supporting a high degree of electronic conjugation serve as important functional components in devices and materials for advanced electronic and photonic applications. Increasing the spatial dimensionality of such constructs can fundamentally modify their optoelectronic properties and significan…
Abstract Low pressure glow discharge nitrogen plasma has been used to improve wettability in a low density polyethylene (LDPE) film for technical applications. The plasma treatment was carried out at a power of 300 W for different exposure times in the 1–20 min range. Wettability changes were analyzed using contact an…
An experimental system of a four-pad 3 omega-method with noise cancellation circuit was designed to measure simultaneously thermal conductivity, thermal diffusivity and heat capacity of an individually suspended wire. The closed solution of temperature oscillation, in which the heat transport in the wire is modelled a…
The effect of pH and composition of sulfuric–oxalic acid mixture on the self-ordering configuration of high porosity alumina nanohole arrays, Kashi, M Almasi, Ramazani, A, Rahmandoust, M, Noormohammadi, M
Water dispersible ZnS:Mn nanocrystals were synthesized by capping the surface of the nanocrystals with four kinds of aminoacids ligands: arginine, cystein, histidine, and methionine. The aminoacids capped ZnS:Mn nanocrystal powders were characterized by XRD, HR-TEM, EDXS, and FT-IR spectroscopy. The optical properties…
We report on a study of thermodynamic functions and phase stability of lithium alanates $\mathrm{Li}\mathrm{Al}{\mathrm{H}}_{4}$ and ${\mathrm{Li}}_{3}\mathrm{Al}{\mathrm{H}}_{6}$ using ab initio density-functional and quasiharmonic phonon calculations. The calculated thermodynamic functions are in good agreement with…
Abstract The composites of poly(ε‐caprolactone) (PCL) and graphite oxide (GO) were successfully synthesized by ring‐opening polymerization of ε‐caprolactone with GO as the initiator. The composites with different GO content were synthesized and an exfoliated structure was found for all the composites from the wide ang…
The magnetic properties of nanocrystalline manganites La 1− x MnO 3+δ with particle size of 20 (LMO20), 25 (LMO25), and 30 nm (LMO30), prepared by the citrate method, have been investigated in the temperature range 5–320 K, magnetic field up to 90 kOe and under quasi-hydrostatic pressures up to 14.5 kbar. The studies…
Ab initio total energy calculations using the plane-wave pseudopotential method based on density functional theory were carried out to investigate the structural, energetic and electronic properties of A 2 Ti 2 O 7 (A = La, Gd and Yb) pyrochlores. It turned out that the formation energies of antisite defects are not l…
Rates of steady oxygen-isotope exchange differ in interesting ways for two sets of structural oxygens in the [HxTa6O19](8-x)-(aq) Lindqvist ion when compared to published data on the [HxNb6O19]8-x(aq) version. Because of the lanthanide contraction, the [HxTa6O19](8-x)-(aq) and [HxNb6O19](8-x)-(aq) ions are virtually i…
Abstract This feature article highlights three types of hyperbranched fluoropolymers (HBFPs) with different structural features, which were synthesized by either polycondensation of fluorinated AB x monomers or self‐condensing vinyl (co)polymerization of fluorinated inimers and/or fluorinated comonomers. Amphiphilic c…
Abstract A novel method of macromolecule encapsulation using micron‐sized polymeric shells constructed with a photoactive azobenzene containing polyelectrolyte is discussed. Fluorescently labeled dextran molecules were encapsulated using light to remotely shrink and change the wall permeability of new polymeric hollow…
Abstract Biocompatible multi‐arm star block copolymers based on poly( L ‐lactide) (PLLA) have been prepared by a core‐first approach, using hyperbranched polyglycerol (PG), a polyether polyol, as a polyfunctional initiator. The molecular weight of the hyperbranched initiator‐core was varied from 2 200 to 5 200 g · mol…
Radar absorbing materials with metal magnetic micropowder-coated honeycomb sandwich structures are prepared by a spray process. Metal magnetic micropowder is applied as an absorber which maintains a high absorption, and a honeycomb sandwich structure as a supporter enhancing mechanical strength. The microwave absorpti…
Abstract A novel, parallelised approach to Monte Carlo simulations for the computation of full molecular weight distributions (MWDs) arising from complex polymerisation reactions is presented. The parallel Monte Carlo method constitutes perhaps the most comprehensive route to the simulation of full MWDs of multiple ch…
Glasses in the system Na2−2xB4−4xBixMo0.5xO7−4x, 0 ≤ x ≤ 0.4, have been prepared by the melt quenching technique. Elastic properties and IR spectroscopic studies have been employed to study the role of Bi2O3 and MoO3 on the structure of Na2B4O7 glass. Elastic properties and Debye temperature have been investigated usi…
The question of the existence of a structural glass transition in two dimensions is studied using mode coupling theory (MCT). We determine the explicit d dependence of the memory functional of mode coupling for one-component systems. Applied to two dimensions we solve the MCT equations numerically for monodisperse har…
Abstract Transparent film materials with excellent mechanical and thermal properties were elaborated by drying a latex suspension of armored polymer/Laponite composite particles. Low‐temperature TEM observation of ultrathin cross‐sections of the films indicated a unique network morphology characterized by a “honeycomb…
Mesostructured metallic substrates composed of square pyramidal pits are shown to confine localized plasmons. Plasmon frequency tuning is demonstrated using white light reflection spectroscopy with a wide range of structure dimensions from $400\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}3000\phantom…
Highly luminescent and stable CdTe quantum dots (QDs) in sol−gel-derived composite silica spheres coated with 5,11,17,23-tetra- tert -butyl-25,27-diethoxy-26,28-dihydroxycalix[4]arene (C[4]/SiO 2 /CdTe) are prepared via the sol−gel technique in aqueous media, which are characterized by transmission electron microscopy…