Materials Literature
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The good, the bad, and the poly: Amphiphilic poly(methyl methacrylate)-block-poly(ethylene oxide) can be used as a template to give anatase TiO2 films with stable nanovesicle morphology (see image). The process couples a good/poor solvent-pair-induced phase-separation process and sol–gel chemistry. The multilayer tita…
The density functional theory is used to explore structural, electronic, and vibrational properties of NO, NO(2), and NO(3) adsorption on small silver clusters, Ag(n), with n =1-8. Generally, NO adsorbs in a top configuration, whereas NO(2) and NO(3) are adsorbed in bridge configuration. NO2 and NO3 introduce pronounc…
We report on a carbon nanotube network which is composed of aligned metallic and randomly oriented semiconducting single-walled carbon nanotubes. The material is formed by using a novel radio frequency dielectrophoresis setup, which generates very large dielectrophoretic force fields and allows dielectrophoretic assem…
Abstract Carbon nanofibers were produced from a polyacrylonitrile/ N,N ‐dimethylformamide precursor solution by an electrospinning process and later pyrolysis at temperatures ranging from 500 to 1100°C in an N 2 atmosphere for about 1 h. The morphological structure of the nanofibers was studied with scanning electron…
We have investigated several effects due to the confinement of polymer melts by impenetrable (hard) surfaces in the self-consistent field calculations. To adequately represent such confinement, the total (normalized) polymer segmental density (volume fraction) is usually constrained to an imposed profile that continuo…
Microgel particles with a soft repulsive interaction potential are investigated with particle tracking methods to study the phase behavior of soft-sphere systems. The use of poly(N-isopropylacrylamide) particles allows the effective volume fraction of a sample to be tuned via thermal modulation without altering the pa…
Purpose This paper aims to present a 3D numerical analysis of the load noise generation associated with large, oil immersed three‐phase power transformers. Design/methodology/approach After studying the mechanical behavior of the winding structures of transformers, the results of coupled magneto‐mechanical simulations…
Abstract A modified clay was used to prepare poly( L ‐lactic acid)/clay nanocomposite dispersions. X‐ray diffraction and transmission electron microscopy experiments revealed that poly( L ‐lactic acid) was able to intercalate the clay galleries. IR spectra of the poly( L ‐lactic acid)/clay nanocomposites showed the pr…
Crystallization of two-dimensional spherulitic calcium carbonate films was performed on planar films of chitosan in the presence of poly(acrylic acid) (PAA). PAA, electrostatically bound to the chitosan substrate, increased the local concentration of calcium at the surface, thereby promoting CaCO 3 crystallization the…
Purpose – The paper presents an application of the scaling theory in a description of energy losses in soft magnetic materials in order to improve an agreement between measurements and theoretical models.
Abstract Novel cofacial bismetallophthalocyanines and theirwater‐soluble derivatives were prepared. The precursor4,4′‐(2‐phenyl‐1,3‐dioxane‐5,5‐diyl)bis(methylene)bis(oxy)diphthalonitrile 3 was obtained by the reaction of [5‐(hydroxymethyl)‐2‐phenyl‐1,3‐dioxan‐5‐yl] methanol 1 and 4‐nitrophthalonitrile 2 with K 2 CO 3…
Tetraazaperopyrene and a range of derivatives have been synthesised and their photophysical and redox-chemical properties studied. The parent compound, 1,3,8,10-tetraazaperopyrene (1), was prepared by treating 4,9-diamino-3,10-perylenequinone diimine with triethyl orthoformate, whereas the 2,9-disubstituted derivative…
Growth of carbon nanotubes (CNTs) by metal-catalyzed thermal chemical vapor deposition (CVD) upon flat silicon substrates is studied as a function of growth temperature. It is found that the CNT growth rate at a given temperature is constant for a certain amount of growth time, after which growth ceases; the product o…
Abstract A method for the preparation of well‐defined crystallites of MgCl 2 ‐supported Ziegler‐Natta catalysts on Si wafers has been developed. This has been achieved by the spin‐coating of a MgCl 2 solution onto a flat Si wafer, followed by controlled crystal growth to give well‐defined MgCl 2 · n EtOH crystallites.…
The authors have investigated the dynamic properties of liquid nickel near the melting point by means of first principles molecular dynamics simulations in the framework of the density functional theory. Single-atom as well as collective dynamic properties are determined and transport coefficients are deduced. The cal…
A range of fullerenes (C60) functionalized with long alkyl chains have been synthesized and inserted into single-walled carbon nanotubes. The impact of the alkyl chain length and of the type of linker between the addend and the fullerene cage on the geometry of molecular arrays in nanotube has been studied by high-res…
Abstract We have systematically studied the thin film morphologies of asymmetric polystyrene‐ block ‐poly(ethylene oxide) (PS‐ b ‐PEO) diblock copolymer subjected to solvent vapors of varying selectivity for the constituent blocks. Upon a short treatment in neutral or PS‐selective vapor, the film exhibited a highly or…
The structural features of the ferroelectric compound Sr 2 NaNb 5 O 15 have been carefully studied. A detailed investigation has been performed by means of room temperature (RT) and high temperature (HT) powder X-ray diffraction (XRD), selected area electron diffraction (SAED), high resolution electron microscopy (HRE…
A top-down/bottom-up approach has been developed to fabricate mesoporous silica with well-aligned mesochannels of controlled orientation by means of cooperative assembly of an amphiphilic triblock copolymer (P123) and silica species within lithographically designed confined nanospaces. Some mesochannel patterns that c…
Abstract L,L ‐lactide (LA) and ε ‐caprolactone (CL) block copolymers have been prepared by initiating the poly( ε ‐caprolactone) (PCL) block growth with living poly( L,L ‐lactide) (PLA*). In the previous attempts to prepare block copolymers this way only random copolyesters were obtained because the PLA* + CL cross‐pr…