Materials Literature
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Abstract 3‐Acceptor‐substituted and 3,7‐bisacceptor‐substituted phenothiazines can be synthesized in moderate to excellent yields through Suzuki cross‐coupling reactions between phenothiazin‐3‐yl pinacolyl boronates or phenothiazin‐3,7‐diyl bis(pinacolyl boronates) and electron‐deficient (hetero)aryl halides. The elec…
Abstract A study on the influence of the crystal modification (α and β) of isotactic polypropylene (i‐PP) films on the resulting electret properties is presented. Two commercial nucleating agents, sodium 2,2′‐methylene‐bis(4,6‐di‐ tert ‐butylphenyl)‐phosphate (NA11) and N,N′‐dicyclo‐hexyl‐2,6‐naphthalene‐dicarbox‐amid…
We have studied the effect of branching on the solution phase behavior of branched homopolymers using grand canonical Monte Carlo (GCMC) simulations in conjunction with multihistogram reweighting and finite-size scaling analysis. The critical temperature ( T c ) and the ϑ temperature (ϑ) decrease as polymer branching…
Fly ash can be effectively used as compacted or flowable fill material in the construction of structural fills for building foundations, embankments, base and subbase courses for highways and railroads, dikes, levees, bridge abutments, and landfill cover in lieu of conventional earth materials. In this study, high vol…
Abstract In general, silica‐filled rubber compounds contain a silane coupling agent to improve the filler dispersion and polymer–filler interactions. The silane coupling agent modifies the silica surface and makes crosslinks between the rubber and the silica. Influence of the modification of silica on the retraction b…
The double perovskite of nominal composition Sr2FeTeO6 has been prepared by the freeze-drying method. Simultaneous Rietveld refinement of X-ray and high resolution D2B neutron diffraction data has shown it to have space group I12/m1 but with a significant degree of pseudo-tetragonal symmetry with a = 5.6080(3) Å, b =…
By using both the pseudoelasticity and strain self-sensing ability of shape memory alloy (SMA) material, an innovative smart SMA-based damper can be developed. This damper has comprehensive energy dissipation and strain self-sensing abilities (i.e., electric resistance versus applied strain relationship) simultaneousl…
Abstract Wood flour reinforced poly(propylene carbonate) (PPC) composites were prepared by melt blending followed by compression molding. The effects of reinforcement on the morphology, static and dynamic mechanical properties, and thermal properties of PPC/wood flour composites were investigated. In terms of mechanic…
The adsorption of amyloid beta-peptide at hydrophilic and hydrophobic modified silicon-liquid interfaces was characterized by neutron reflectometry. Distinct polymeric films were used to obtain noncharged (Formvar), negatively (sodium poly(styrene sulfonate)) and positively charged (poly(allylamine hydrochloride)) hyd…
Aligned multiwalled carbon nanotube (MWNT)–polymer composites are synthesized for use in microelectromechanical systems (MEMS) applications. Indentation and bending tests reveal that the elastic modulus of the MWNT–MEMS devices is promoted by a factor of 20. Dynamic bending experiments show that MWNT–MEMS devices can…
A quantitative high-resolution transmission electron microscopy study has been performed on tetragonal, single-crystalline $\mathrm{Pb}({\mathrm{Zr}}_{0.4}{\mathrm{Ti}}_{0.6}){\mathrm{O}}_{3}$ islands grown on Nb-doped $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}(001)$ substrates, revealing the strain fields of a 90\ifmmod…
The photocurrent produced at single-walled carbon nanotube–Zn contacts with zero bias is amplified by a factor of 4–7 upon application of a bias (see Figure). Between ± 0.5 mV biases, the ideality factor only deviates slightly, but at biases of larger magnitude, current amplification becomes nonlinear owing to charge…
We report that the cold shock protein CspA of Staphylococcus aureus is required for maximal production of pigment. Results from transcriptional studies revealed that loss of CspA resulted in decreased expression of genes needed for the biosynthesis of 4,4'-diaponeurosporene and the alternative sigma factor SigB.
Abstract A series of novel porphyrin–phthalocyanine (Por‐Pc) dyads 1 – 3 have been synthesized by using standard methodologies for unsymmetrically substituted phthalocyanine preparation. These two chromophoric units have been directly linked for the first time, that is, without any spacer, through the β‐pyrrolic posit…
Sulfonation reaction may be an effective method for preparation of heparin-like materials. However, no sulfonated polymer based on protein backbone was used for improving the blood compatibility of biomaterials. In this study, the biocompatibility of new kind of composite materials films obtained by blending silk fibr…
In bacteria, thiamine pyrophosphate (TPP) is an essential cofactor that is synthesized de novo. Thiamine, however, is not an intermediate in the biosynthetic pathway but is salvaged from the environment and phosphorylated to TPP. We have isolated and characterized new mutants of Bacillus subtilis that deregulate thiam…
We report controlled ignition of magnetization reversal avalanches by surface acoustic waves in a single crystal of ${\mathrm{Mn}}_{12}$ acetate. Our data show that the speed of the avalanche exhibits maxima on the magnetic field at the tunneling resonances of ${\mathrm{Mn}}_{12}$. Combined with the evidence of magnet…
Vanadium oxide macroscopic fibers (see Figure) are obtained by an extrusion process. The fibers consist of nanoscopic ribbons with a preferential orientation and a longitudinal Young's modulus of around 15 GPa. As well as showing high sensitivity, the fibers reversibly cycle between insulating and semiconducting upon…
Universal mechanisms of adsorption and capillary condensation of toluene and nitrogen on ordered MCM-41 and PHTS materials are studied by means of high-resolution experiments and Monte Carlo molecular simulations. A molecular simulation model of toluene adsorption in silica nanopores, which accounts for surface hetero…
Hydrogen energy systems: For reversible hydrogen storage TiF3 is superior to TiCl3 as a dopant precursor for preparing catalytically enhanced Ti–NaAlH4 systems (see diagram). In addition to the increased hydrogen capacity, the TiF3-doped NaAlH4 exhibits a more pronounced kinetic enhancement than the TiCl3-doped hydrid…