Materials Literature
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Abstract The miscibility of blends of chitosan and hydroxyethylcellulose in a 2% acetic acid solution was studied by viscometry, densitometry, and refractometry at 35°C. The data suggest that the blends were completely miscible in all proportions. Further, the membranes were fabricated from concentrated blend solution…
Abstract A nonradiative dielectric waveguide (NRD) embedded in a metamaterial with negative permittivity or permeability is proposed and theoretically characterized in this work. This dielectric waveguide structure is inherently nonradiating at bends and discontinuities, since metamaterials with negative permittivity…
Abstract Summary: Three‐dimensionally ordered macroporous (3DOM) syndiotactic polystyrenes with pore size in the range of 71–286 nm were fabricated by means of silica templates using (dbm) 2 Ti(OPh) 2 /MAO catalytic system. The resulting materials were characterized by NMR, SEM, powder X‐ray diffraction, GPC and DSC.…
Abstract Summary: The present communication reports the first use of electron tomography in reconstructing the three‐dimensional morphology in thermoplastic elastomer blends. The blends investigated were dynamically vulcanized blends of ethylene‐propylene‐diene (EPDM) rubber/poly(propylene)/oil and polystyrene‐ block…
A new method for fluorescence imaging based on a polymeric photobase generator containing oxime-urethane groups was developed via the use of fluorescamine, a prefluorescent amino-group dye. The fluorescent image obtained is stable and has a high contrast and good resolution (see Figure). In addition, it is possible th…
In this work, the different adsorption properties of H and alkali metal atoms on the basal plane of graphite are studied and compared using a density functional method on the same model chemistry level. The results show that H prefers the "on-top site" while alkali metals favor the "middle hollow site" of graphite bas…
The reaction of diaminomaleonitrile (DAMN) with aldehydes such as acrolein, methacrolein, and crotonaldehyde in the presence of acid catalyst at low temperature yielded exclusively monoimine derivatives of DAMN. These compounds have very low loss of volatiles up to 1000 °C and form high char yields. The residual mass…
Removal of a single electron induced the extended conformers of bis(catecholacetal)s of acetylacetone to instantaneously fold into cyclophane-like π-stacked structures (shown schematically).
A controlled technique for embedding ferromagnetic nanoparticles in a diamagnetic PVC matrix with uniform dispersion and a wide particle concentration range is described here. The resulting material is a magnetopolymeric nanocomposite with combined magnetic and polymeric properties. The tailoring of its magnetic respo…
Abstract The synthesis of polyamide–polyester‐based diblock, triblock, and random block copolymers was carried out in a modular, corotating twin‐screw extruder via reactive extrusion. ω‐Lauryllactam (LA), ϵ‐caprolactam (CA), and ϵ‐caprolactone (CL) were used as monomers for the synthesis of the copolymers in the twin‐…
The formation of biominerals by living organisms is governed by the cooperation of soluble and insoluble macromolecules with peculiar interfacial properties. To date, most of the studies on mineralization processes involve model systems that only account for the existence of one organic matrix and thus disregard the i…
The nature of Li 1+ α V 3 O 8 · n H 2 O gel-like precipitate and corresponding xerogels has been studied. Unlike V 2 O 5 gel, the Li 1+ α V 3 O 8 gels are diphasic materials made of intimately mixed solid and liquid phases having very close Li/V stoichiometry. At room temperature, the solid component contains presumab…
The ${\mathrm{Na}}_{x}\mathrm{Co}{\mathrm{O}}_{2\ensuremath{-}\ensuremath{\delta}}$ system---a host lattice for superb thermoelectrics and parent of the watery $\mathrm{Co}{\mathrm{O}}_{2}$-layer superconductor---is found to be oxygen nonstoichiometric for $x\ensuremath{\leqslant}0.7$, such that with decreasing $x$, t…
Scanning tunneling spectroscopy measurements were performed on an epitaxial thin film of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ grown on a ${\mathrm{NdGaO}}_{3}$ substrate. The temperature variation of the density of states (DOS) close to the ferromagnetic transition temperature $({T}_{c})$ was inv…
The effect of rapid thermal annealing temperature on the diffusion of silicon (Si) and germanium (Ge) and the formation of Ge nanocrystals in a silicon oxide matrix was investigated. The formation of Ge nanocrystals was attributed mainly to the reduction of Ge suboxides by Si diffused from the Si substrate. For sample…
Twelve adsorption isotherms of oxygen on a high surface activated carbon have been collected with a volumetric apparatus for the range (118−313) K and (0−10) MPa. The isosteric enthalpy change of adsorption was evaluated on the basis of these isotherms. It shows a descending trend with the increased amount adsorbed. A…
A controlled cross-linking polymerization system was designed, and soluble chemically cross-linked polyurethane was synthesized using laurylamine, n-octylamine, n-pentylamine, and ethylenediamine chain extenders. The mechanical analysis showed that the polyurethane materials synthesized in this paper have very excelle…
Through an interplay between atomistic thermodynamics, isotherm models, and kinetics, all based on density functional theory calculations, we propose a mechanism for the removal of the $(1\ifmmode\times\else\texttimes\fi{}2)$ missing-row reconstruction on Au(110) under high CO pressure. Elevating the pressure from ult…
The formation of lyotropic solutions in water has yet to be reported for polyaramides. In this work, we investigate the synthesis and properties of a water-soluble polyaramid via the inclusion of a sulfonated monomer in the backbone of the polymer chain. Using sulfonated terephthalic acid (sTA) together with a diamine…
Abstract The graft copolymerization of methyl methacrylate (MMA) onto sodium salt of partially carboxymethylated guar gum (Na‐PCMGG; degree of substitution = 0.497) with ceric ammonium nitrate as a redox initiator in an aqueous medium was studied. The optimized reaction conditions affording the maximum percentage of g…