Materials Literature
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Abstract The effects of filler loading and a new silane coupling agent 3‐octanoylthio‐1‐ propyltriethoxysilane (NXT silane) on the polymer‐filler interaction and mechanical properties of silica‐filled and carbon black‐filled natural rubber (NR) compounds were studied. Silica (high dispersion silica7000GR, VN2, and VN3…
In a recent paper [Ruland & Smarsly (2002). J. Appl. Cryst. 35 , 624–633], an advanced method for the evaluation of the small-angle X-ray scattering (SAXS) from oriented lamellar systems was presented. In the present work, a comparable method is developed for the study of oriented cylinder arrays. Basic difference…
Optical spectroscopic properties of Er3+ and Tm3+ ions in a tellurite glass, TeO2-BaO-SrO-Nb2O5 (TBSN), were investigated for C- and S-band optical amplifications. On the basis of consideration for cross relaxation among Tm3+ ions and multiphonon relaxation, it was shown that the presence of Nb2O5, which was a source…
Optical transmittance of a 90-twisted nematic liquid crystal cell inserted between crossed or parallel polarizers is neither sensitive to the molecular twist sense nor to the exchange between the extraordinary and the ordinary birefringence axis at the input face of the cell. In this article, the equivalence between a…
We determined the crystallization region of KGd(PO 3 ) 4 (KGP) in the ternary system Gd 2 O 3 −K 2 O−P 2 O 5, the isotherms of saturation temperature and six neighboring phases: KPO 3, GdPO 4, KGdP 4 O 12, Gd(PO 3 ) 3 -orthorhombic, Gd(PO 3 ) 3 -monoclinic, and GdP 5 O 14 . We successfully grew KGP single crystals by…
Based on ab initio calculations for a number of the ${\mathrm{Ba}}_{\mathrm{c}}{\mathrm{Sr}}_{(1\ensuremath{-}\mathrm{c})}\mathrm{Ti}{\mathrm{O}}_{3}$ (BST) superlattices, we developed a thermodynamic approach to these solid solutions. In particular, we calculate the BST phase diagram and show that at relatively low t…
The cavity perturbation technique is an extremely powerful method for measuring the electrodynamic response of a material in the millimeter- and submillimeter spectral range (10GHz–1THz), particularly in the case of high-field/frequency magnetic resonance spectroscopy. However, the application of such techniques withi…
Abstract Summary: The synthesis of core‐shell particles with a poly( ε ‐caprolactone) (PCL) shell and magnetite (Fe 3 O 4 ) contents of between 10 wt.‐% and 41 wt.‐% proceeds by surface‐initiated ring‐opening polymerization of ε ‐caprolactone to give surface‐immobilized oligomers with $\overline M _{\rm n}$ between 1…
Abstract Structurally robust block copolymer templates with feature sizes of approximately 10 nm were prepared from functionalized poly(methyl methacrylate)‐ b ‐polystyrene block copolymers. By the inclusion of benzocyclobutene crosslinking groups in the polystyrene block, the covalent stabilization of thin films to b…
Electron motion in a $(n,1)$ carbon nanotube is shown to correspond to a de Broglie wave propagating along a helical line on the nanotube wall. This helical motion leads to periodicity of the electron potential energy in the presence of an electric field normal to the nanotube axis. The period of this potential is pro…
One of the most fundamental questions in the research field of undercooled melts is concerned with the structural short-range order of melts, because the short-range order decisively influences the physical properties and the solidification behaviour of undercooled liquids. Following the pioneering work of Frank in 19…
The defect accumulation mechanism of amorphization has been studied for the La2Zr2O7 pyrochlore by means of classical molecular dynamic simulations. Present calculations show that the accumulation of cation Frenkel pairs is the main driving parameter for the amorphization process, while the oxygen atoms simply rearran…
Cobalt oxide in the wurtzite modification has been prepared by a nonaqueous solution route and its structure determined using neutron and X-ray powder diffraction. SQUID magnetization measurements and low-temperature neutron diffraction do not show evidence for long range magnetic order, perhaps reflecting magnetic fr…
Molecular architectures built of inorganic cyanometalate building blocks provide variegated host structures with several organic guest molecules. The strategies to derive novel structures are presented briefly. The formation of a charge-transfer (CT) complex as the guest inside the cavity and the photochemistry of the…
A metal-boron mixed cluster LiB(6) (-) was produced and characterized by photoelectron spectroscopy and ab initio calculations. A number of electronic transitions were observed and used to compare with theoretical calculations. An extensive search for the global minimum of LiB(6) (-) was carried out via an ab initio g…
Thrombus formation and eventual intimal hyperplasia are the leading causes of small-diameter synthetic vascular graft failure. To combat these issues, we have incorporated a diazeniumdiolate-modified nitric oxide (NO)-producing peptide into a polyurethane to improve the thromboresistance of this biocompatible polymer.…
We have investigated the photonic properties of a free-standing cholesteric elastomer film under biaxial mechanical load. The sample, which was obtained by UV cross-linking of a cholesteric side-chain polymer, shows substantially improved optical properties compared to cholesteric elastomers obtained by the anisotropi…
We present a neutron diffraction study of the transition between low-density and high-density amorphous ice (LDA and HDA, respectively) under pressure at approximately 0.3 GPa, at 130 K. All the intermediate diffraction patterns can be accurately decomposed into a linear combination of the patterns of pure LDA and HDA…
Abstract Summary: We have developed the first direct, organocatalytic, bulk ring‐opening polymerization (ROP) of ε ‐caprolactone ( ε ‐CL) with solid cotton and paper cellulose as the initiators. The mild ROPs were performed without solvent, and are operationally simple, inexpensive and environmentally benign. Organic‐…
A theoretical approach for the intramolecular energy transfer process involving the ligand-to-metal charge transfer (LMCT) state in lanthanide compounds is developed. Considering a two-electron interaction, both the direct Coulomb and exchange interactions are taken into account, leading to expressions from which sele…