Materials Literature
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Rare earth modified Pb(Zr,Ti)O3–Pb(Sb,Mn)O3 piezoelectric ceramics have been studied for various thermal and electrical histories. In both “freshly” poled and unpoled conditions, thermal quenching was found to increase the remnant polarization (Pr) and induced strain of hard piezoelectrics, relative to that of anneale…
Abstract An inorganic‐organic composite was prepared by poly(amidoamine) (PAMAM) dendrimer reacting with cobalt(II)‐monosubstituted polyoxometalates Na 5 Co II (H 2 O)PW 11 O 39 (PW 11 Co) in an aqueous solution. The hybrid composite PW 11 Co/PAMAM was characterized by FT‐IR, UV‐Vis diffuse reflectance spectra (DR‐UV‐…
The state of platinum in carbon-supported bimetallic PtSn and PtIn catalysts, prepared by two different methods, coimpregnation and successive impregnation, has been investigated by X-ray photoelectron spectroscopy, X-ray absorption fine structure (XAFS), transmission electron microscopy (TEM), and a catalytic test. A…
The potential of carbon nanotubes as reinforcing fibres in polymer composites is reviewed, with particular emphasis on oriented systems such as films and fibres. The introduction of nanofibres into such oriented polymer systems can mimic the structure of natural materials such as bone and tooth, creating 'designed' co…
ABSTRACT A rapid, specific method was developed to detect Listeria monocytogenes using magnetic nanobeads to separate and concentrate the target bacteria and quantum dots (QDs) as fluorescent markers. QDs are semiconductor nanocrystals which measure from a few nanometers to a few hundred nanometers, and are particular…
Abstract Molecular dynamics simulations were applied to investigate the diffusion behaviors of water molecules at temperatures ranging from 323 to 443 K inside amorphous polyacrylate. The results showed that the simulated diffusion coefficients and activation energies were similar to those of experiments. Moreover, th…
The experimental investigations of a magnetic field-induced strain has been carried out in the Heusler alloy Ni 45 Co 5 Mn 36.7 In 13.3 by a capacitance method in a single-shot pulse magnetic field with a frequency of 200 Hz. A 3% deformation has been observed on the application of a maximum pulse field of 70 kOe at 3…
We have synthesized two series of C2v symmetric discotic liquid crystals of 2,3‐dicyano‐6,7,10,11‐tetraalkoxy‐1,4‐diazatriphenylene [referred to as (C n O)4DADCT (1); n = 8, 10, 12, 14] and 2,3‐dicyano‐6,7,10,11‐tetraalkoxytriphenylene [referred to as (C n O)4DCT (2); n = 8, 10, 12, 14]. Polarizing microscopic observa…
The effect of water on the morphology of BaO/Al 2 O 3 -based NO x storage materials was investigated using Fourier transform infrared spectroscopy, temperature programmed desorption, and time-resolved synchrotron X-ray diffraction techniques. The results of this multispectroscopy study reveal that in the presence of w…
Polarization techniques have been implemented to determine the size and shape of LaF 3 core−shell nanoparticles in aqueous colloidal solutions, by studying the optical properties of the Eu 3+ active ion inserted as a dopant in the core of the nanoparticles. A luminescence anisotropy as high as 0.4 has been measured fo…
The thermodynamic and kinetic factors that determine the localization of carbon black particles at interfaces in polymer blends were established. Substantial differences in particle localization conditions at the interfaces of two high-molecular-mass or low-molecular-mass liquids were revealed; these differences are m…
Detailed experimental studies are described for reactions of several nitrogen oxides with iron porphyrin models for heme/NxOy systems. It is shown by FTIR and optical spectroscopy and by isotope labeling experiments that reaction of small increments of NO2 with sublimed thin layers of the iron(II) complex Fe(Por) (Por…
Neutron reflectometry was used to investigate the structures of end-tethered protein resistant polymer layers based on poly(oligo(ethylene glycol) methyl ether methacrylate) [poly(OEGMA)] and poly(2-methacryloyloxyethyl phosphorylcholine) [poly(MPC)]. Layers having different graft densities were studied in both the dr…
A mechanistic study of chloroboron subphthalocyanine (SubPc) formation from phthalonitrile and BCl 3 in aromatic solvents such as p-xylene or toluene suggests that rearrangement of the initial phthalonitrile- BCl 3 adduct produces (1 Z )-3-chloro-N-(dichloroboryl)-1 H -isoindol-1-imine 3, following rearrangement of th…
Abstract Low density polyethylene (LDPE) composites based on cellulose fibres have been processed by high shear extrusion with water injection to help dispersion of fibres and release nanofibres from cellulose. Influence of extrusion parameters as shear, residence time, storage conditions of the matrix, and effect of…
Lead-free tetragonal tungsten bronze Sr2LaTi2Nb3O15 ceramics were prepared and its crystal structure determined. Dielectric response of Sr2LaTi2Nb3O15 was investigated in a broad frequency (100 Hz–90 THz) and temperature range. The observed relaxor-like behavior can be generally described in the framework of polar nan…
Abstract The present contribution reports the electrospinning of PS/MEH‐PPV fibers with average diameters ranging from 0.165 to 1.190 µm from solutions of PS/MEH‐PPV (PS/MEH‐PPV = 7.5:1, w/w) in 1,2‐dichloroethane. With the addition of pyridinium formate (PF), a volatile organic salt, to the PS/MEH‐PPV solution, the e…
Abstract We have developed a flame‐retardant polycarbonate resin whose flame retardancy is greatly enhanced by adding fly ash (a by‐product from thermal power plants). Fly ash with comparatively small average particle sizes (<10 µm) raised the flame retardancy of polycarbonate because of the hydrogen bond that form…
Abstract Various segmented polyurethanes with a hard segment content of about 50 wt% were prepared from 4,4′‐diphenylmethane diisocyanate (MDI), a poly(tetramethylene adipate) glycol with an M n of 2000, and various combinations of aliphatic diols as chain extenders by a one‐shot, hand‐cast bulk polymerization method.…
Abstract Spinel cobalt oxide doped with nickel and zinc are deposited using a CVD reactor equipped with a pulsed spray evaporation system. This process allows easy control of the film composition through the adjustment of the composition of the liquid feedstock; a linear dependence is observed in both cases. Doped spi…