Materials Literature
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Neat polyamide 6 homopolymer (PA 6) and a series of commercial polymer nanocomposites (PNC) containing up to 7.5 wt. % of exfoliated organoclay nanoparticles were characterized by the exothermic effects of nonisothermal crystallization in the standard differential scanning calorimetry (DSC) mode during constant‐rate c…
In the article the results of studies on modification of poly(L-lactide) (PLA) via influencing its thermal history, artificial nucleation of crystallization, plasticization or filling with montmorillonite were summarized.It was found that PLA heated from the glassy state and isothermally cooled from the molten state,…
The Bi–Sr–Co–O system has been investigated for small bismuth contents in order to study the formation of the misfit oxide series built up from the stacking of three rocksalt-type layers (n=3) with a single CdI2-type CoO2 hexagonal layer. Starting from nominal compositions, written as [Sr2Co1−xBixO3]RS[CoO2]1.8 (x=0.1…
Lyophilization increases the shelf-life of liposomes by preserving it in a dry form as lyophilized cake to be reconstituted with water immediately prior to administration. Aiming at increasing stability and availability of 5-Fluorouracil liposomal products, 5-Fluorouacil Stable Plurilamellar Vesicles were prepared. Fr…
In microchannel flow, gas–liquid interface behavior will be important for developing a wide range of microfluidic applications, especially in micro reactors. In this article, we discuss some topics related to capillary action and two-phase fluid behavior in a microchannel. One of the topics is interface motion in the…
In this study nonlocality is discussed with regard to the differential and discrete formulations. Here, nonlocality is found to be a concept attaining not to the description of the material, but to the governing equations. This has made it possible to discuss the op-portunity of introducing nonlocality in the constitu…
Mössbauer spectra of Fe-substituted 3/2-mullite (10.3 wt% Fe 2 O 3 ) have been measured from room temperature up to 1200 °C under nitrogen atmosphere. A Voigt-type fit to the spectral line shape is proposed that is based on the assumption of three non-equivalent Fe 3+ environments A, B, and C in the mullite structure.…
In this paper we report the rapid synthesis of Se–Te based chalcogenide glasses through microwave irradiation without the help of metal powders. Mixtures of chalcogens can be made to couple to microwaves when at least one constituent of the mixture has a relatively higher electrical conductivity. Also, this constituen…
High-energy ion beam irradiation of cross-linking type polymers gives nanowires formed by cross-linking reactions along the ion track trajectories. A fairly simple technique has been developed to control the size and number density of nanowires based on polystyrene (PS) by selecting appropriate ion beam characteristic…
The structural aspects of xCs2O-(1-x)B2O3 glasses have been investigated by molecular dynamics as functions of Cs2O content (x=0.2, 0.3, and 0.4) and temperature (T=300 and 1250 K). The tetrahedral (BØ4-) and triangular (BØ3,BØ2O-, and BØO2 (2-)) short-range order borate units were found to be the structure-building e…
A preparação de complexos bentonita-ionenos a partir da adsorção de tetrametil-[x,y]-ionenos, onde x= 2 e y= 4,6,10 ou 12, e o 2-hidróxi-3-cloro-ioneno, EPI-DMA, foi realizada com a finalidade de observar o comportamento do tamanho do espaçador do ioneno na expansão basal (d001) das camadas de uma bentonita comercial…
The growth of science and technology of polyurethanes leads to the development of new materials with more desirable properties. Such kinds of materials include metal‐containing polyurethanes, poly(urethane‐urea)s, poly(urethane‐ether)s, poly(urethane‐ester)s, poly(urethane‐ether‐ester)s, poly(urethane‐imide)s, and pol…
Abstract A direct approach for producing methanol from methane in a three‐step, liquid phase process is reported. In the first step, methane is reacted with SO 3 to form methanesulfonic acid (MSA) at 75 °C using a free‐radical initiator and MSA as the solvent. Urea‐H 2 O 2 in combination with RhCl 3 is found to be the…
Vertically aligned carbon nanotubes (CNTs) with long length and high density were successfully synthesized on SiO2, Ta, and Ti substrates by thermal chemical vapor deposition (CVD). The use of Fe catalyst film supported by an Al buffer layer (Fe∕Al) has a significant influence on the increase of the number density of…
First-and second-order Raman scattering spectra in Si nanocrystals have been studied. The shift to lower frequencies and the substantial broadening of first-order Raman scattering lines observed to occur with decreasing nanoparticle size were established to correlate with those in second-order spectra. It is shown tha…
FCC metals with different stacking fault energy (SFE), namely Al, Cu and Ag have been investigated for the evolution of crystallographic texture during ECAE deformation using Route A. Different materials with different SFE result in their characteristic textures. The results have been analysed on the basis of microstr…
Copper of 4N purity was deformed at room temperature by equal channel angular pressing (ECAP) using three passes of route A. The local microstructure and texture were investigated by orientation imaging microscopy and high-energy synchrotron radiation, respectively. The microstructure consists of elongated grains whic…
Stoichiometric In 2 Se 3 films were deposited at room temperature. X-ray diffractometry (XRD) and field-emission scanning electron microscopy (FE-SEM) showed that the as-deposited films were amorphous and had very smooth surface morphology while the films annealed at 250°C or higher temperatures were crystalline and h…
The inhibition efficiency (IE) of adipic acid (AA)-Zn 2+ system in controlling corrosion of carbon steel immersed in well water has been evaluated by weight-loss method. The formulation consisting of 50 ppm of AA and 50 ppm of Zn 2+ has 95% IE. At lower pH value(pH=6) IE decreases and in alkaline medium (pH=8) IE incr…
Abstract This paper reviews the different types of heat resistant elastomers and the effects of compounding on the high temperature performance of these materials. Degradation mechanisms and testing procedures are discussed briefly. New developments in improving high temperature resistance are presented.