Materials Literature
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Abstract Poly(trimethoxy silylpropylaniline), a nanoporous (pore diameter of 2.4 nm), electroactive (stable reversible redox characteristics), electrochromic (yellow at −0.10 V, blue green at +0.50 V, and dark green at +0.70 V), and pH‐sensitive, silica–polyaniline (PANI) hybrid material (designated as KGM‐1) has been…
Low temperature sintering of α‐Si3N4 matrix ceramics was developed in the present study using 4 wt‐%MgO together with Al2O3 or AlPO4 as the sintering additives and spark plasma sintering technique. The results suggested that α‐Si3N4 ceramics could be densified at low sintering temperature by adjusting both the sinteri…
Abstract Poly(butylene terephthalate) (PBT)/styrene‐acrylonitrile copolymer (SAN) blends were investigated with respect to their phase morphology. The SAN component was kept as dispersed phase and PBT as matrix phase and the PBT/SAN viscosity ratio was changed by using different PBT molecular weights. PBT/SAN blends w…
Abstract Sequential electropolymerization of aniline followed by an aniline derivative bearing an ion moiety is presented. The studied derivatives contain sulfonic, carboxylate or amino groups. Its electrochemical behavior at acid and neutral pH is studied by cyclic voltammetry combined with quartz crystal microbalanc…
Formenvielfalt: Komplexe Partikel mit unterschiedlichen Formen, z. B. Kugeln, Zylinder, Scheiben, Herzen, Sechsecke und Januspartikel, können durch zwei verschiedene oberflächenspannungsinduzierte Fluss-Sequenzen (A und B; siehe Bild; Maßstab 100 μm) hergestellt werden. Die Partikel lassen sich als anisotrope Baustein…
Unsupported gold nanoparticles in solution are reported here for the first time to catalyze the oxidation of CO at ambient conditions. Gold was stabilized in solution by various polyamidoamine dendrimers. Dendrimer-encapsulated gold nanoparticles (DENs) 0.5−2.5 nm in diameter have low initial activity. With storage ti…
Abstract A computational procedure is presented to quantify the order achieved in assembled block copolymer films when no disruptive defects are present (i.e., dislocations or disclinations). Both simulated and real systems were used to show that sub‐nm variation in the domain position, as well as the corresponding re…
The effect of confinement by crystals on the α relaxation, observed by dielectric broadband spectroscopy, in isotropic as well as in oriented semicrystalline poly(vinilydene fluoride), is analyzed on the basis of a new thermodynamic model. In both samples, it has been found that the average free-energy barrier, ΔF, fo…
The low-temperature electrical transport properties of nanocrystalline boron-doped diamond (b-NCD) thin films have been found to be strongly affected by the system's granularity. The important differences between the high and low-temperature behaviour are caused by the inhomogeneous nucleation of superconductivity in…
During deposition of polycrystalline gold thin films, a compressive stress develops that reversibly changes during interruptions of growth. One model for this mechanism posits that this reversible stress change is related to adatom diffusion into and out of grain boundaries and recent work has established a relationsh…
A continuum model for the transport phenomena in solidification systems is used to investigate the formation of macrosegregation in a 360 t multiconcentration poured steel ingot. A numerical scheme with explicit time stepping in solidification problems is employed to solve coupled temperature and concentration fields,…
Electrospinning has been recognised as an efficient technique for the fabrication of continuous nanofibres. In the present paper, an approach to producing nanoporous materials by electrospinning was discussed, and a general strategy for the synthesis of nanoporous materials by electrospinning was suggested. The number…
With the aid of ab initio, parameter free calculations based on density-functional and many-body perturbation theory, we investigate the electronic band structure and electron affinity of diamond surfaces. We focus on clean, ideal (0 0 1) and (1 1 1) surfaces and on the effect of hydrogen adsorption. Also single sheet…
The synthesis of two chiral amphiphiles and their self-assembling features in solution and onto surfaces is reported. The different degree of interdigitation of the paraffinic substituents has an enormous influence in the chirality of the aggregates. Thus, while oligo(phenylene ethynylene) 1 shows a bisignated Cotton…
Carbon nanotubes rank amongst potential candidates for a new family of nanoscopic devices, in particular for sensing applications. At the same time that defects in carbon nanotubes act as binding sites for foreign species, our current level of control over the fabrication process does not allow one to specifically cho…
We calculate electronic structures of a high-${T}_{c}$ iron-based superconductor ${\text{Sr}}_{2}{\text{VFeAsO}}_{3}$ by local-density approximation (LDA) plus $U$ method. We assume a checkerboard antiferromagnetic order on its blocking layers including vanadium and strong correlation in $d$ orbits of vanadium through…
In this paper we have carefully investigated the structural and physical properties of the ${\text{SmFe}}_{1\ensuremath{-}x}{\text{Ir}}_{x}\text{AsO}$ solid solution $(0\ensuremath{\le}x\ensuremath{\le}0.275)$, chosen as a case study, by means of synchrotron x-ray diffraction, Raman spectroscopy, and magnetization mea…
Abstract We study the optical and magnetic properties of quasi one‐dimensional dilute magnetic Zn1−xMnxS and antiferromagnetic (AF) MnS as a function of size, Mn content x, and sample morphology. On the one hand, we discuss the temporal dynamics of the yellow Mn‐related luminescence of the samples under resonant excit…
Materials with A2B2O7 (pyrochlore) structure have received significant attention for their applications as new protonic conductors and materials used in electronic devices. One of the unique synthesis routes for La2Zr2O7 (pyrochlore) powders is the glycine–nitrate combustion method, which shows superior properties of…
A new pathway by means of transetherification has been developed to synthesize novel unsymmetrical 2,3,9,10,16,17,23-heptakis(alkoxyl)-24-mono(dimethylaminoalkoxyl)phthalocyanine compounds. Cyclic tetramerization of 4,5-di(alkoxyl)phthalonitrile in refluxing dimethylamino-alcohol with high boiling point such as dimeth…