Materials Literature
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Abstract Quantitative polymerization of 4‐vinyl pyridine (4‐VP) and its quaternization has been done simultaneously for the first time in absence of organic solvents. 1, 4‐dibromo‐2‐butene acts as quaternizing agent. The quaternized polymer has been characterized by chemical, thermal and spectral analysis. The mechani…
Abstract Towers of aligned multiwalled carbon nanotubes (MWCNTs) were electrochemically oxidized in aqueous 1 M NaOH. An oxidation current that decayed with time was monitored using amperometry at a fixed potential. Cyclic voltammetry showed that the background current and electrode capacitance increased after oxidati…
Abstract A new supramolecular species of naphthalene‐diimide cyclophane containing triazole units was synthesized, and its fluorescent responses to metal ions were investigated in dichloromethane (DCM). The fluorescence emission of NDI was quenched by intramolecular electron transfer, whereas the appearance of dimer e…
A new technique is developed to fabricate biomimetic antireflection coatings (ARCs). This technique combines a bottom-up fabrication approach (glancing angle deposition, or GLAD) with a top-down engineering process (ion milling). The GLAD technique is first utilized to produce nanopillar arrays (NPAs) with broadened s…
Abstract In this letter, we propose the design of two new narrowband power splitters in waveguide technology. The proposed layouts are based on the extraordinary transmission phenomenon, obtained using metamaterial‐inspired bi‐omega particles. In this way, the power splitters operate in a narrow frequency range and al…
The synthesis and spectroscopic characterization of azido derivatives of Cu(II) complexes with macrocyclic building blocks of the type [CuLN3] n · [ClO4 · 3/2H2O] n (1), [CuL(N3)2] (2) and [CuL1N3]n · [ClO4]n (3) (where L = 3,10-bisbenzyl-1,3,5,8,10,12-hexaazacyclotetradecane and L1 = 3,10-bisbenzyl-6,13-dimethyl-1,3,…
Abstract Oxidative polycondensation of 3‐(1‐(2‐phenylhydrazono)ethyl)phenol (3‐PHEP) was studied using oxidants such as sodium hypochlorite, air (O2) and hydrogen peroxide in an aqueous alkaline medium under various polymerization conditions. The polymerization yield, molecular weight, solubility, and thermostability…
Abstract We designed a multilayered spherical invisibility cloak with minimum number of isotropic layers by particle swarm optimization technique. The optimization parameters are permittivity and permeability of the layers and their thicknesses. The objective function is the total scattering cross section. For the clo…
ABSTRACT The dual‐primal finite‐element tearing and interconnecting (FETI‐DP) method is combined with the tree‐cotree splitting (TCS) method to expand the capability and improve the efficiency of the finite‐element analysis of electromechanical devices. With the FETI‐DP method, an original large‐scale problem is decom…
Abstract Synthetic adhesives containing 3,4‐dihydroxy‐L‐phenylalanine and its derivatives have strong adhesion strength and good biocompatibility, which make them prime candidates for adhesives or bioadhesives applications. In this study, a new photocurable poly (vinyl alcohol) (UV‐PVA) derivative was prepared and use…
We have investigated the sintering behavior of Sr hexaferrite ( SrFe 12 O 19 ) and the effects of adding CuO , which partly substituted for the Fe 2 O 3 and the Fe deficiency during the sintering. For the experiments, samples with nominal compositions of SrCu x Fe y − x O 19−δ ( x = 0–1.0, y = 11–12) were prepared wit…
The goal of this paper is to immobilize gold nanoparticles uniformly on a glass substrate. In order to attach gold-nanorods (GNRs) to an area of a few squared microns surface of glass substrate without preliminary coating of the GNR, 3-(Mercaptopropyl)trimethoxysilane molecules were used as linker while using differen…
Quantum dots (QDs) are semiconducting nanocrystals that have photoluminescent (PL) properties brighter than fluorescent molecules and do not photo-bleach, ideal for in vivo imaging of diseased tissues or monitoring of biological processes. Near-infrared (NIR) fluorescent light within the window of 700-1000 nm, which i…
In this work, controlled promotion of crystallization was investigated for application to multilevel storage by using a vertical TiSi3/Ge2Sb2Te5/TiN cell with a thin phase-change layer. Finite element analysis exhibits that crystallization gradually proceeds with increasing applied current in the radial direction afte…
ZnO thin films were grown on Si(100) substrates by a sol-gel method assisted by laser beam irradiation with a 325 nm He-Cd laser. In contrast to conventional sol-gel ZnO thin films, the surface morphology of the laser-assisted sol-gel thin films was much smoother, and the residual stress in the films was relaxed by la…
The computational and storage demands for the future Square Kilometer Array (SKA) radio telescope are significant. Building on the experience gained with the collaboration between ASTRON and IBM with the Blue Gene based LOFAR correlator, ASTRON and IBM have now embarked on a public-private exascale computing research…
The lanthanide silicate La${}_{9.33}$Si${}_{6}$O${}_{26}$, which has the hexagonal apatite structure ($P{6}_{3}$/$m$), was investigated at high pressure. A subtle phase transition was observed at \ensuremath{\sim}13.3 GPa by in situ synchrotron x-ray diffraction and confirmed by infrared absorption and Raman scatterin…
Abstract A Ni‐containing porous silicon oxycarbide (SiOC) material was produced from a blend of polyphenylmethylsiloxane (PPMS), azodicarbonamide (ADA) and nickel(II) acetylacetonate (Ni(acac)2) by a direct foaming technique. Homogeneous foaming of PPMS with well‐controlled macropore size distribution in the range of…
Using only a simple tube furnace, we demonstrate the synthesis of patterned graphene directly on a designed substrate without the need for an external carbon source. Carbon atoms are absorbed onto Ni evaporator sources as impurities, and incorporated into catalyst layers during the deposition. Heat treatment condition…
Nematic molecules confined in an asymmetric π cell and subjected to strong electric fields exhibit textural distortions involving nematic order variations, described by the Landau-de Gennes Q-tensor theory. We investigated the evolution of order variations as function of the applied electric pulse amplitude and of the…