Materials Literature
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Abstract A kind of novel polyether polyurethane (PU)/clay nanocomposite was synthesized using poly(tetramethylene glycol), 4,4′‐diphenylmethane diisocyanate (MDI), 1,6‐hexamethylenediamine, and modified Na + ‐montmorillonite (MMT). Here, organicly modified MMT (O‐MMT) was formed by applying 1,6‐hexamethylenediamine as…
Microcrystalline powders of spirooxazine and spiropyran compounds do not show photocoloration under steady-state illumination, whereas they undergo photochromism on intense femtosecond laser-pulse excitation. We investigated the characteristic mechanism of the crystalline photochromism by studying the photocoloration…
Abstract This article reports the results of a study comparing commercially available high‐cis polybutadiene rubbers (BRs) proceeding from different production technologies and bearing distinct structural characteristics. The microstructure of these polymers was characterized by Fourier transform infrared spectroscopy…
Understanding the interfacial interactions between the nanofiller and polymer matrix is important to improve the design and manufacture of polymer nanocomposites. This paper reports a molecular dynamic study on the interfacial interactions and structure of a clay-based polyurethane intercalated nanocomposite. The resu…
The dynamics of oxygen motion in ZrW(2)O(8) have been characterized using (17)O solid-state NMR. Rates of dynamic exchange have been extracted from magnetization transfer experiments over a temperature range of 40 to 226 degrees C, and distinct values for the associated activation barrier have been observed on either…
We investigate the phase behavior and 3D structure of strongly attractive mixtures of silica microspheres and polystyrene nanoparticles. These binary mixtures are electrostatically tuned to promote a repulsion between like-charged (microsphere-microsphere and nanoparticle-nanoparticle) species and a strong attraction…
[Reaction: see text]. The novel synthetic strategy and optical properties of highly fluorescent, triazine-amine conjugated oligomers are described herein. Under basic conditions, aromatic dinitrile compounds, NC-C6H4-X-C6H4-CN (X = NMe, O, CH2), underwent cyclic trimerization of the cyano groups at both ends to give a…
Abstract Single crystals of the title compound have been obtained by reaction of Gd 3 (ClH 2 CCOO) 9 (H 2 O) 5 with 2,2′‐bipyridyl (bipy) in a solution of ethanol and water. Gd 2 (ClH 2 CCOO) 6 (bipy) 2 crystallises in the triclinic space group P $\bar {1}$ ( Z = 2) with a = 959.5(3) pm, b = 980.9(3) pm, c = 1163.9(4)…
Polyaniline (PANI) nanofibres or nanotubes (180–200 nm in diameter) containing Fe 3 O 4 nanoparticles (diameter ≈10 nm) and PANI-coated γ - Fe 2 O 3 nanoneedles (40–80 nm in diameter and 500–600 nm in length) were prepared by in situ doping polymerization in the presence of H 3 PO 4 as a dopant. The composite nanostru…
Abstract Our main objective of this study was to study the parameters affecting the free‐radical melt grafting of maleic anhydride (MA) onto linear low‐density polyethylene (LLDPE) with dicumyl peroxide (DCP) in an internal mixer. The degree of grafting (DG) was measured with titrometry and Fourier transform infrared…
A simple fabrication route combining large-area nanoscale-patterning methods with gaseous sulfidation is used to generate well-ordered, highly crystalline arrays of MoS2 nanostructures. Independent control over the dimensions of the patterned nanostructures can be achieved. Preferential orientation of MoS2 nanocrystal…
Abstract Core–shell acrylate latices containing fluorine in the shell were prepared by semicontinuous emulsion polymerization. The chemical components of the latices were determined by Fourier transform infrared, ion‐selective electrode analysis, and differential scanning calorimetry. The average size and morphology o…
Nanoparticle nitriding: Boron nitride nanocages (see Figure) of less than 80 nm are synthesized in large amounts by a moderate chemical route simply by nitriding Fe–B nanoparticles under mild conditions. The synthesis is performed at only 750 °C, and the product shows rather promising solid-state lubricating propertie…
Abstract DFT calculations indicate norcorrole (NCH 2 ), a 16π‐electron doubly contracted porphyrin, to be a promising synthetic target, especially when complexed to a small cation such as Ni II . The relative stability of norcorrole derivatives appears to reflect the fact that they are not antiaromatic, but should rat…
[reaction: see text] Two easy-to-synthesize polypyrrolic 2,5-diamidothiophene Schiff base macrocycles are reported, along with their anion binding properties as determined via UV-vis spectroscopic titrations carried out in dichloroethane. There is a striking difference between the interactions with anions of the two m…
Contrary to theoretical prediction that Cr-doped bulk ZnO is ferromagnetic, recent experiments on Cr-doped ZnO thin film reveal the coupling to be antiferromagnetic. Using first-principles calculations based on gradient corrected density functional theory, we show that a possible origin of this disagreement may be ass…
The rational design and synthesis of CdSe/CdTe/ZnTe (core-shell-shell) type-II quantum dots are reported. Their photophysical properties are investigated via the interband CdSe-->ZnTe emission and its associated relaxation dynamics. In comparison to the strong CdSe (core only) emission (lambda(max) approximately 550 n…
The scattering spectra of single gold, silver, and bimetallic gold-silver particles (both core-shell and alloyed) have been examined using dark-field microscopy. The results show that the plasmon resonances for the bimetallic particles are broader than those of the pure silver or pure gold particles. However, plots of…
The magnetic properties of two epitaxial ${\mathrm{Fe}}_{3}\mathrm{Si}∕\mathrm{Ga}\mathrm{As}(001)$ hybrid structures are studied using ferromagnetic resonance. The results from the angular dependence of the excited uniform mode enable a precise determination of the magnetic anisotropy fields in this ferromagnet/semic…
Activated carbon fibers derived from polyaramids exhibit an outstandingly homogeneous pore size distribution. Here, we review the work carried out on the porosity characteristics of carbons prepared from these polymers, specifically Kevlar [poly( p -phenylene terephthalamide)] and Nomex [poly( m -phenylene isophthalam…