Materials Literature
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Abstract The amorphous aluminosilicate allophane was synthesized by rapid mixing of inorganic solutions with high initial concentrations (10 – 100 mmol/l) followed by hydrothermal treatment. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed homogeneous products having a hollow spherical amorp…
Abstract Nanocomposites based on biodegradable poly(ϵ‐caprolactone) (PCL) and layered silicates (montmorillonite, MMT) were prepared either by melt interaction with PCL or by in situ ring‐opening polymerization of ϵ‐caprolactone as promoted by the so‐called coordination‐insertion mechanism. Both non‐modified clays (Na…
Abstract The resistance to air permeation was investigated for an intercalated clay/acrylonitrile‐butadiene copolymer nanocomposite. The nanocomposite is prepared by melt mixing the organo‐treated montmorillonite into a rubber matrix, together with peroxide curative, and crosslinked by conventional compression moldi…
This paper investigates utilizing zero span UHF PD detection. The findings suggest that the technique is a practical solution for on-line PD monitoring of transformers in the presence of noise and also permits the use of existing knowledge on PD defect signatures.
Nanocrystalline CeO 2 powders have been successfully synthesized via a carbonate precipitation method, using ammonium carbonate (AC) as the precipitant and cerium nitrate hexahydrate as the cerium source. The AC/Ce 3+ molar ratio ( R ) affects significantly precursor properties, and spherical nanoparticles can be prod…
PURPOSE: To determine whether intratumoral accumulation of liposomal doxorubicin or free unencapsulated doxorubicin is increased when combined with radio-frequency (RF) ablation. MATERIALS AND METHODS: Two 1.2-1.5-cm R3230 mammary adenocarcinomas were grown within the mammary fat pads of 19 female Fischer rats. One tu…
Applications of CoFe/sub 2/O/sub 4/ are limited due to the lack of synthesis technique to produce monodispersed, single domain and high coercivity (H/sub c/) nanoparticles. Here, we describe the growth dominant co-precipitation process to achieve high H/sub c/, with moderate magnetization at room temperature (RT) in C…
Using highly conductive Al doped ZnO (AZO) ceramic target, (001)-oriented transparent conductive AZO (Al doped ZnO) thin films are prepared by dc planar magnetron sputtering deposition on glass sheet substrates. The structural, electrical, and optical properties of the films (deposited at room temperature and annealed…
(2002). Characterization of polymer thin films with small‐angle X‐ray scattering under grazing incidence (GISAXS) Synchrotron Radiation News: Vol. 15, No. 5, pp. 35-42.
Piezoresponse force microscopy has been used to investigate the nanoscale mechanism of imprint behavior of ferroelectric PbTiO3 thin films by studying the photoinduced changes in the hysteresis loops of individual grains. Illumination of the film with UV light resulted in a voltage shift opposite to that observed in f…
Abstract A concise review of papers published during the last 3 years about the synthesis, blends, processing, and applications of electronically conductive polymers, is presented in this article. Copyright © 2002 John Wiley & Sons, Ltd.
RATIONALE AND OBJECTIVES: Comparison of two different ultrasmall superparamagnetic iron oxide (USPIO) particles in terms of their intracellular cell-labeling properties of macrophages and subsequent visualization by MR imaging. MATERIALS AND METHODS: Cultures containing the macrophage cell line P-388D1 were incubated…
We present experimental and analytical results for the pyrolysis reactions underlying the conversion of a cross‐linked polymer into an amorphous ceramic material. The activation energies, obtained from thermogravimetric data, and chemical analysis of the volatiles by mass spectroscopy are used to identify the reaction…
Abstract The effect of crystallization on the structure and morphology of maleic anhydride grafted polypropylene (PP‐MA)/clay (montmorillonite) nanocomposites (PPCNs) is presented. Wide‐angle X‐ray diffraction (WAXD) measurements of PPCNs crystallized at different temperatures show that the extent of intercalation inc…
Influences of the substituted amount of La3+ on structure and magnetic properties of Sr1—xLaxFe12O19 compounds prepared by the sol–gel method have systematically been investigated by XRD, VSM, and TEM. Optimum magnetic properties of σs = 74.1 Am2/kg and HcJ = 498.4 kA/m are achieved with material of the composition Sr…
Peptides carried by filamentous phages with potential affinity to calcium carbonate were selected experimentally from a phage display library. The isolated phage were employed to affect the precipitation of calcium carbonate from aqueous solution. SEM, FTIR, and confocal microsopy techniques were used to monitor the m…
A cold electron emitter has been fabricated based on nanocrystalline silicon (nc-Si) quantum dots formed in the gas phase by very-high-frequency plasma decomposition of SiH4. A small size of less than 10 nm and the spherical shape of the nc-Si dots facilitated the generation of hot electrons. Electrons with kinetic en…
Thermal hysteresis of the reflectivity of vanadium dioxide films observed upon the metal-semiconductor phase transition is studied. The major hysteresis loop is assumed to form when the phase equilibrium temperature in film grains and the grain size vary and correlate with each other. Within the suggested concept of h…
In this article, the interface screening model is theoretically discussed which explains imprint in ferroelectric thin films caused by a large electric field within a surface layer with deteriorated ferroelectric properties. During aging this field is gradually screened by electronic charges. Different screening mecha…
We compare the linear and non-linear rheological properties of a typical soft glassy material, the colloidal glass of Laponite, with the predictions of recently developed rheological models based on glassy dynamics, in which particles are trapped in a free-energy landscape with many minima. We find qualitative agreeme…