Materials Literature
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Using all-electron density functional theory with gradient correction, we have investigated the stability of quasi-one-dimensional tubular nanostructures by stacking the pentagonal FeSi 10 prism and hexagonal FeSi 12 prism along their axes. The local magnetic moments on Fe atoms in finite hexagonal nanotubes increase…
Ge 2 Bi 2 Te 5 in the GeTe–Bi 2 Te 3 pseudobinary system has two single-crystalline phases: a metastable phase with an NaCl-type structure and a stable phase with a nine-layer trigonal structure. In the metastable phase, the structure consists, in the hexagonal notation, of infinitely alternating stacks of Te and Ge/B…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Monolayers of ABA amphiphilic triblock block copolymers are studied using surface pressure-area and X-ray reflectivity (XR) measurements. The triblock copolymers are composed of long poly(ethylene oxide) (PEO) middle blocks with poly((perfluorohexyl)ethyl methacrylate) (PFMA) end blocks. The surface pressure-area isot…
Abstract Three different surface modifiers, octadecyl trimethyl ammonium (ODTMA), octadecyl primary ammonium (ODPA), and decanediamine (DDA) were used to modify Na + montmorillonite (MMT), and the resultant organoclays were coded as ODTMA‐MMT, ODPA‐MMT, DDA‐MMT, respectively. Rigid PU foams/organoclay composites wer…
The crystal structure of the compositionally homogeneous ceria-zirconia solid solution CeZrO(4) is refined by Rietveld analysis of neutron diffraction data measured in situ over the temperature range 296-1831 K. The CeZrO(4) exhibits a tetragonal structure with the space group P4(2)/nmc at temperatures from 296 to 154…
We study nematic liquid crystal configurations in a prototype bistable device -- the post aligned bistable nematic (PABN) cell. Working within the Oseen-Frank continuum model, we describe the liquid crystal configuration by a unit-vector field n , in a model version of the PABN cell. First, we identify four distinct t…
Well-aligned ZnO nanowire arrays have been successfully synthesized on Si(100) substrate by a vapour transport process. A ZnO thin film was used as the nucleation sites, which can control the growth orientation of the nanowires. By observation of the initial process of nanowire growth, a vapour transport solid condens…
The crystal structures of two compounds, CuL(2) and LiNCS.HL [HL = 4'-[2-(tosylamino)benzylideneamino]-2,3-benzo-15-crown-5], have been determined from synchrotron powder diffraction data. Both compounds crystallize in the monoclinic space group P2(1)/c and with one molecule in the asymmetric unit. In CuL(2) the four…
Single‐crystalline mullite (3Al 2 O 3 ·2SiO 2 ) nanowires have been synthesized on silicon substrates by forcing aluminum and chromium chloride powders to react under an ammonia gas flow. The diameter and length of the nanowires have uniform diameters of <100 nm and several micrometers, respectively. High‐resolutio…
Abstract Role of maleic anhydride grafted polypropylene (PP‐ g ‐MAH) in interface modification in polypropylene (PP)/poly(dimethylsiloxane) (PDMS) elastomer blend has been investigated in this article through its effects on morphology of dispersion, micromechanical deformations such as voiding, crazing, shear yielding…
Abstract Organoclays with different levels of reduction in the original cation exchange capacity (CEC) were prepared to characterize the morphology and Young's modulus of their melt‐processed nanocomposites made from nylon 6 (PA‐6) and polypropylene/polypropylene grafted with maleic anhydride (PP/PP‐ g ‐MA). Wide‐angl…
We have performed total-energy electronic-structure calculations based on the density-functional theory that clarify atomic and electronic structures of ice nanotubes encapsulated in carbon nanotubes. We have found that three tubular structures of ice are stable in carbon nanotubes. The structural characteristics of t…
Abstract Multiwalled carbon nanotubes (MWNTs) and ultrahigh molecular weight polyethylene (UHMWPE) composites are prepared using paraffin as solvent. The resulting electrical properties show lower electrical percolation threshold, which is 1.4 vol %, than that of UHMWPE‐MWNT composites prepared by gelation/crystalliza…
Abstract The natural antibacterial agent allyl isothiocyanate (AITC) encapsulated in either α‐ or β‐cyclodextrin (CD) has previously been evaluated as a slow‐release additive in polylactide‐ co ‐polycaprolactone (PLA–PCL) films designed for use in cheese packaging. In the research described in this article, thermograv…
Abstract A wide‐band reflective polarizer from glassy siloxane cyclic side‐chain liquid crystals with stable optical properties was developed. The pitch gradient that formed was first stored by rapid cooling, which, by preventing the crystallization of glassy materials, was a very easy way of keeping the molecular arr…
The work presents a study of the formation of defects created by argon ion sputtering of UO 2 thin film surfaces using high-resolution X-ray photoelectron spectroscopy with photon energy of 625 eV. Stable-defected surfaces of UO 2- x were monitored by the uranium core level lines found at the low-binding energy side o…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
We studied the optical gain characteristics of CdSe/ZnS core/shell colloidal quantum rods, investigated their temperature dependence, and compared the gain properties with quantum dots (QD). The gain was measured systematically for close-packed films of rods and dots under quasi-CW nanosecond optical pumping, using th…
We describe a novel purification process for single-wall carbon nanotube (SWNT) materials that removes non-nanotube carbon and reduces ferromagnetic impurities to levels at which native SWNT magnetic properties predominate. Ferromagnetism is reduced from 1.04 to less than 0.013 emu/g by magnetic gradient filtration. T…