Materials Literature
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Abstract New silicone modified acrylic resins were synthesized and some of their film properties were investigated. At first, macromer (MC) was synthesized by the condensation reaction of the reactive polysiloxane intermediate (Z‐6018) and 2‐hydroxyethyl methacrylate (HEMA) in toluene as solvent at 110°C under nitroge…
Summary — Stereocomplexes composed of 6, ~13, 24 and 32 arm star-shaped poly(lactide)s (ss-sc-PLAs) and of the mixed star-shaped — linear PLAs (sl-sc-PLAs) were prepared in a controlled way. Their thermal properties were characterized by DSC and compared to their linear counterparts properties. It was observed that th…
Thermalization of photogenerated carriers in bulk materials is the main bottleneck for the conversion efficiency of conventional inorganic solar cells. Furthermore, despite extensive research, the achieved conversion efficiency is nearly saturated during the last decade. Therefore, new device concepts to break through…
A numerical method has been developed for calculating the director configuration in ellipsoidal droplets of a nematic liquid crystal with strong tangential anchoring in a uniform magnetic field of an arbitrary orientation. A relation has been obtained for determining the Friedericksz threshold corresponding to the beg…
Abstract The brief results of the first‐principles ground‐state total energy calculations for aliminium nitrat (AlN) in zincblende and rocksalt structures are presented. Structural, elastic, and electronic calculations are performed using the SIESTA method with norm‐conserving pseudopotentials. The obtained results ar…
Physical, chemical and mineralogical characteristics of seven soils developed on four different parent materials such as basalt, limestone, marine and alluvium were studied to determine the effect of parent material on the soil characteristics in the arid and semiarid regions in the Southeast Anatolia Region of Turkey…
The adsorption of proteins is the first process to take place when a solid is immersed in a biological fluid; though not yet thoroughly understood at a molecular level, this process is also known to be strongly influenced by the presence of salt in solution or by pH changes. In the present work, poly-L-glutamic acid (…
The synergistic effect of 2(2-hydroxy styryl) pyridinium -N- ethyl iodide (cyanine dye) and some selected metal cations viz. Zn+2 or Cr+3 on the corrosion of low carbon steel in 2M H2SO4 has been studied by weight loss measurements and galvanostitic polarization technique over the temperature range 30 to 60°C. The eff…
The corrosion properties of nanocrystalline Co-1.1 and 2.1 wt% P alloys and their annealed alloys as well as nanocrystalline Co were studied in a deaerated 0.1 M sulfuric acid (H2SO4) solution using electrochemical measurements and x-ray photoelectron spectroscopy (XPS) surface analysis. Potentiodynamic polarization t…
The aim of this study is to determine the effect of Nb5+doping on PZT (65/35) based bulk materials in their structure, micro structure and electrical properties. The Nb content was chosen 0-9 mole%. These materials were prepared by conventional mixed oxide method. X ray diffraction studies suggest the compound to be o…
Magnetoresistivity measurements of polycrystalline bismuth microwire arrays having a range of different diameters and a bulk sample were performed under applied magnetic fields between 0 and 2T and temperatures from 50to300K. A thin film layer was deposited on the terminations of the microwire arrays in order to compl…
In situ time-resolved X-ray absorption spectroscopy was used to observe the first stage of NiO nanoparticle formation. The spectra of Ni K-edge (and their Fourier transforms) during heating show a systematic structural phase transformation (amorphous to crystalline) near 400 °C. Crystallization occurs during heating o…
Abstract Lanthanide complexes with linear and cyclic octadentate oligopyridine-amine ligands were synthesized, and their molecular structures were determined by single-crystal X-ray crystallography. All of the complexes had a distorted capped square antiprism (CSAP) geometry, and the coordination environments of lanth…
Gas insulated switchgear (GIS) has been increasingly being used in recent years and high reliability and rational insulation design are required. This research provided V-N characteristics (the dielectric breakdown voltage versus number of repetitions characteristics) regarding the internal insulation and creeping ins…
This article reports the sensitization of the glow peak at 300 °C in crystalline quartz by using high doses of gamma radiation. Five lots of samples were prepared from single crystals extracted from different geological occurrences in Brazil. The specimens were submitted to high doses of 60Co radiation starting at 25…
The disposal of cured rubber has become a major environmental problem. Discarded rubber was devulcanized by an open two-roll cracker-cum mixing mill both in the presence or absence of diphenyl disulfide at 120°C (Mechano-Chemical Process, MCP), and then the obtained devulcanized mass was revulcanized again by the addi…
Abstract Nanostructured p‐type and n‐type porous silicon samples were prepared for (100) and (111) orientations and a systematic study is carried out on the effects of orientations, dopant type (boron and phosphorous), current density (20 and 30mA/cm 2 ) and etching time on the formation, optical and thermal propertie…
Abstract In this work the effect of melt mixing condition and of a trans ‐esterification catalyst on miscibility of poly(methyl methacrylate) (PMMA)/polycarbonate of bisphenol A (PC) blends is studied. In particular, at high temperature chemical reactions between PMMA and PC phases can take place; these strongly chang…
OBJECTIVE: The aim of the study was to evaluate the pure titanium castability and internal porosity with 3 different sprue designs. METHOD AND MATERIALS: The sprue designs selected were the conventional cylindrical, funnel-shaped, and sheet-form sprue formers. To evaluate the castability, the mesh monitor was chosen.…
<abstract language="eng">The first days of radioactivity, the discoveries of X-rays, radioactivity, of alpha- and beta- particles and gamma- radiation, of new radioactive elements, of artificial radioactivity, the neutron and positron and nuclear fission are reviewed as well as several adverse historical marks, such a…