Materials Literature
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Abstract Nanocomposite particles consisting of silica (inorganic core) and polyacrylate (organic shell) were prepared in a form of emulsion by a new and simple method—the emulsion polymerization of acrylic monomers in the presence of silica sol. The key technique of the present emulsion polymerization, which made the…
Abstract The Schiff base L H 3 obtained by condensation of 3‐formyl‐4‐hydroxyphenyl‐3,4,5‐tris(tetradecyloxy)benzoate with 1,3‐diamino‐2‐propanol reacts with lanthanide( III ) acetate salts to form dinuclear complexes of the type Ln 2 L 2 with the trivalent ions from the first half of the lanthanide series (Ln = Nd, S…
The question of coloring: Calculations present a definite solution to the “coloring problem” in the MB2C2 phases (M=Mg, Sc, Ca, Y, Ln; see picture of the four structure types). Electric-field gradient tensor components from NMR spectroscopy readily allow differentiation between the different B/C topologies and give su…
We have investigated the alignment of poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO) induced by photoaligned polyimide films. To induce anisotropic orientation of polyimide backbone structures by optical treatment, we used a specially designed polyimide (Azo-PI), which contains azobenzene in the backbone structure. The 30…
The complex dielectric permittivity epsilon* values are presented for aerosil-dispersed 4-pentyl-4-cyanobiphenyl (5CB) confined in Anopore membranes. The dielectric permittivities are measured in the frequency range from 10(-2) Hz to 1 GHz at temperatures ranging from 50 degrees C down to -20 degrees C. In bulk 5CB, w…
Abstract This work is to make carbon nanotubes dispersible in both water and organic solvents without oxidation and cutting nanotube threads. Polystyrene‐singlewall carbon nanotube (PS‐SWNT) composites were prepared with three different methods: miniemulsion polymerization, conventional emulsion polymerization, and mi…
Uniform carbon/Co nanorods with unique cross-sections (see Figure), Co/carbon core/shell nanospheres, and multiwalled carbon nanotubes are selectively prepared in high yield by solid-state thermolysis of polyphenylene dendrimer/cobalt complexes under controlled heating procedures. The obtained materials have potential…
Abstract Dimethylacetamide (DMAc) containing 8–9% (w/w) of lithium chloride (LiCl) or lithium bromide (LiBr) was found to be a good solvent for a polyrotaxane consisting of poly (ethylene glycol) (PEG) and α‐cyclodextrin (CD). In the new DMAc/LiCl solvent system, various modification reactions such as acetylation, dir…
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…