Materials Literature
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A mesoporous hybrid material containing free phosphine oxide ligands in the pore walls was prepared in the presence of a structure-directing agent. The phosphine oxide ligands were proved to operate as templates for further erbium(III) and/or ytterbium(III) ion complexation.
We study the equilibrium configurations of a nematic liquid crystal confined between two parallel plates, when an electric field is applied. We take into account the mutual interaction of the field and the material. We also analyse the effects of two possibly different weak anchoring potentials at the plates. We use a…
Thermal expansion measurements on unpoled, multidomain, single crystals of PMN-PT in the MPB region reveal that one of the ⟨001⟩ directions is different than the other two, contrary to the crystallographic equivalency that is expected for threefold rotations about ⟨111⟩ derived from the prototypic-cubic phase. This un…
The anions 4-nitrophenolate (4-NP) and 2,4-dinitrophenolate (2,4-DNP) undergo anion-exchange intercalation with [LiAl2(OH)6]Cl·xH2O, ([Li-Al-Cl] LDH), to yield the fully exchanged intercalates [LiAl2(OH)6]{4-NP}·2H2O and [LiAl2(OH)6]{2,4-DNP}·H2O respectively. 4-NP can be selectively intercalated in [Li-Al-Cl] LDH fro…
The phase diagram of model Mott-insulator-band-insulator heterostructures is studied using the semiclassical approximation to the dynamical-mean-field method as a function of thickness, coupling constant, and charge confinement. An interface-stabilized ferromagnetic phase is found, allowing the study of its competitio…
Misfit-layered (ML) cobalt oxides of the general formula of [ M m A 2 O m +2 ] q CoO 2 have been proven to be efficient thermoelectric materials because the structure is capable in accommodating the two seemingly contradictory characteristics of high electrical conductivity and large thermoelectric power. They are als…
Abstract In this article, the effect of sample size on the degassing behavior of closed‐cell low density polyethylene (LDPE) foam under long‐term compressive static loading is presented. The creep response was modeled by assuming isothermal compression of the gas. The change in gas pressure with time was obtained and…
Abstract Miscible polymer blends based on various ratios of poly(vinyl acetate) (PVAc) and poly(methyl methacrylate) (PMMA) were prepared in film form by the solution casting technique using benzene as a common solvent. The thermal decomposition behavior of these blends and their individual homopolymers before and aft…
The effect of alkaline earth ions on the dynamics of ${\mathrm{Li}}^{+}$ ions in bismuthate glasses has been studied in the temperature range $353--503\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and in the frequency range $10\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}--2\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$. The dc conductiv…
Abstract The effect of incorporation of the two different fillers, i.e. calcium carbonate and magnesium hydroxide, over a concentration range of 0–35% w/w on mechanical and burning properties and hot set test of polyethylene (PE) has been studied. The incorporation of either of these fillers deteriorates mechanical pr…
Abstract The Rayleigh ratio of toluene at 25°C for a wavelength of 632.8 nm was determined by static light scattering measurement of a certified polystyrene reference material PS 2400 with exactly evaluated or certified mass‐average molecular mass ( M w ). At first, static light scattering measurements were carried ou…
Abstract Poly(ethylene 2,6‐naphthalate) (PEN) and poly(ethylene terephthalate) (PET) composite fibers reinforced with a thermotropic liquid crystal polymer (TLCP) were prepared by the melt blending and spinning process to achieve high performance fibers with improved processability. Polymer composite fibers consisting…
$\mathrm{MnBi}\text{\ensuremath{-}}\mathrm{Bi}$ composites are fabricated by a magnetic-field-inducing technique under different fabrication fields (0, 0.3, 0.5, and $1\phantom{\rule{0.3em}{0ex}}\mathrm{T}$) and their microstructure and magnetic properties have been investigated. Microstructure results show $\mathrm{M…
It is well understood that due to substrate induced clamping the piezoresponse in thin ferroelectric films is lower than bulk. Recent studies on the effect of lateral scaling have shown that by creating nanostructures one can achieve high piezoelectric constants even in thin films. In this letter we present a simple a…
Abstract Rigid and conductive poly(vinyl chloride) (PVC)/carbon black (CB) composites were prepared in a Haake torque rheometer. The results illustrate that the fusion torque of the PVC/CB composite is increased as the amount of CB is increased. Both the fusion percolation threshold and the fusion time of PVC/CB compo…
Abstract Polyaniline (PANI), poly( o ‐anisidine), and poly[aniline‐ co ‐( o ‐anisidine)] were synthesized by chemical oxidative polymerization with ammonium persulfate as an oxidizing reagent in an HCl medium. The viscosities, electrical conductivity, and crystallinity of the resulting polymers (self‐doped forms) were…
Abstract Epoxy nanocomposites reinforced by nano‐sized sepiolite are investigated. Sepiolite particles and the nanocomposites were characterized by SEM, TEM, XRD, and IR. The level of reinforcement is assessed from impact strength and flexural strength. It is shown that significant improvement in mechanical property i…
Using uncharged or negatively charged L-lysine-based organogelators as templates, the nanostructures of TiO2 are controllable.
A mode coupling theory for the ideal glass transition temperature, or crossover temperature to highly activated dynamics in the deeply supercooled regime, T(c), has been developed for anisotropic polymer liquids. A generalization of a simplified mode coupling approach at the coarse-grained segment level is employed wh…
Temperature-programmed reaction spectroscopy (TPRS) and direct, isothermal reaction-rate measurements were employed to investigate the oxidation of CO on Pt(111) covered with high concentrations of atomic oxygen. The TPRS results show that oxygen atoms chemisorbed on Pt(111) at coverages just above 0.25 ML (monolayers…