Materials Literature
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Abstract The purification that can be attained via crystallization is on the one hand governed by kinetic factors, such as the growth rate, and can on the other hand be limited by thermodynamic factors, such as the formation of a solid solution of the impurity with the product. For organic substances, these solid solu…
Abstract Taking advantage of a melt polycondensation process, a series of copolyesters composed of pure terephthalate acid (PTA), ethylene glycol (EG), and 1,3‐propanediol (1,3‐PDO) were synthesized. The component, molecular weight, molecular weight distribution, and thermal properties of the copolymers were character…
Abstract Photo‐induced trans–cis isomerization of trans‐4‐methacryloyloxyazobenzene and its copolymer with methylmethacrylate, synthesized in this work, were investigated in a polar protic (CDCl 3 ) and a polar aprotic (DMSO‐ d 6 ) solvent, using 1 H‐NMR . The results were cross‐correlated with trans–cis isomerization…
We report a novel approach to grow highly oriented, freestanding and structured carbon nanotubes (CNTs) between two substrates, using microwave plasma chemical vapour deposition. Sandwiched, multi-layered catalyst structures are employed to generate such structures. The as-grown CNTs adhere well to both the substrate…
Abstract Crystals of lead sulfate were precipitated in solutions of various polyelectrolyte polymers (acidic, neutral, and basic polymers) using a double‐jet crystallizer. Polyetyleneimine (PEI) basic polymer controlled both the nucleation rate and crystal growth rate, and enabled the production of fine monodispersed…
We demonstrate the deterministic shape-selective synthesis and growth of CdSe nanowires, nanosaws and nanoribbons by a simple vapour-transport process in a tube furnace. The key step, in order to achieve reproducible shape selectivity for a given set of deposition parameters, is to exclude any effects of the temperatu…
We report on broadband dielectric spectroscopy on the one-dimensional semiconductor (NbSe4)3I. Below the structural phase transition close to 270 K, which is accompanied by complex charge-order processes, we observe colossal dielectric constants with a frequency and temperature dependence very similar to what is obser…
Selective incorporation of CdSe quantum dots (QDs) in the poly(4-vinylpyridine) nanodomains of a poly(styrene-b-4-vinylpyridine) diblock copolymer thin film (see structure) results in much higher conductivity and faster electron tunneling than in a random distribution of the same QDs in poly(4-vinylpyridine) homopolym…
Abstract Agricultural by‐products (wheat straw, WS; sugar beet, SB; corn cobs, CC; rape extracted meal, REM; soya bean hulls, SBH; bagasse, B; almond shells, AS; and olive stones; OS) were analyzed by dynamic and isothermal thermogravimetry (TG) in inert and oxidative environment. The goal was to evaluate the effect o…
Electroactive behavior of poly(acrylic acid) grafted poly(vinyl alcohol) samples, their synthesis using a Ce(IV) glucose redox system and their characterization, Kurkuri, Mahaveer D, Lee, Jae-Rock, Han, Jae Hung, Lee, In
Carbon nanotubes (CNTs) are now well-established as efficient channels for field-effect transistors (FETs). Logic circuitry based on CNTs have until now been demonstrated by replacing the silicon channel of a conventional metal-oxide-semiconducutor FET by a CNT. We propose a circuit design utilizing the ambipolarity o…
Watch your step! The individual steps during the chlorination of [Al13]− clusters via [Al11]−, [Al9]−, and [Al7]− intermediates (see picture) can be “visualized” by means of Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. The reaction can be interpreted as a model reaction for the chlorination of…
Nonlinear characteristics of the Fowler–Nordheim (F–N) plot for field emission from In2O3 nanowires (NWs) is investigated. The field emission from the aligned and nonaligned In2O3 NWs are measured and a stable emission with fluctuations less than 10% was obtained for the aligned In2O3 NWs. It is found that the nonalig…
The physical properties of a wide range of nonchiral single-walled carbon nanotubes (SWNT) and double-walled carbon nanotubes (DWNT) with nonchiral commensurate walls are studied. Equilibrium structures of SWNT and DWNT, as well as the interwall interaction energies of DWNT, are computed using a local density approxim…
Abstract The adsorption isotherms of water vapor on super absorbent product have the same form of type III isotherm at ambient temperature with the hysteresis phenomena. For temperatures lower than ambient, the isotherms become deformed because of the chains effect. The polymer is characterized by a multilayer adsorpt…
Theoretical results for (FeCo)Si substitutional random alloys, obtained within the framework of the exact muffin-tin orbitals method in combination with the coherent potential approximation, are presented. For concentration range $0.1<x<0.9$, the magnetic structure of ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co…
Ti 3 SiC 2 ∕ Hydroxyapatite composites were prepared by spark plasma sintering. The effective dc conductivity and dielectric behavior of the composites were studied. The percolation theory was applied to demonstrate the dielectric behavior of the composites. The experimental results showed that the dielectric constant…
Abstract To improve their dyeing and colorfastness properties, degummed Bombyx mori silks were chemically modified by a grafting technique with either methyl methacrylate (MMA) monomer or methacrylamide (MAA) monomer. Both commercial synthetic dyes, that is, acid and basic dyes, and natural dyes extracted from turmeri…
Abstract The nonisothermal crystallization of poly(ethylene‐ co ‐glycidyl methacrylate) (PEGMA) and PEGMA/clay were studied by differential scanning calorimeter, at various cooling rates. Avrami model modified by Jeziorny, Ozawa mode and Liu model could successfully describe the nonisothermal crystallization process.…
Bragg reflection gratings are holographically recorded in polymer-dispersed liquid crystal materials by using the 632.8-nm wavelength of the He-Ne laser. Mixtures of the commercially available E8 nematic liquid crystal, pentafunctional monomers, and photooxidant dye methylene blue are employed. We demonstrate that Bra…