Materials Literature
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The electrical properties of carbon nanotubes (CNTs) grown by plasma-enhanced chemical vapor deposition (PECVD) have been studied by measuring the I-V characteristics of many CNT-field effect transistors. The ratio of modulation current to total current was as high as 97%, with a small nondepletable OFF current compon…
Polypyrrole (PPY) films were prepared by the electrochemical polymerization technique. The fully undoped samples were irradiated with different fluences ranging from 1010 to 1012 ions/cm2 of 100 MeV silver (Ag8+) ions. In order to explain the effect of these radiations, a comparative study of samples before and after…
BACKGROUND: Nephrogenic systemic fibrosis (NSF) is a rare sclerosing skin condition associated with end-stage renal disease and gadolinium exposure. Therapy for NSF is challenging, with few options other than preventing exposure to gadolinium and improving renal function through transplant. However, in some cases neit…
The extent of natural weathering of phlogopite crystals in a karstic environment and the composition of its weathering products have been examined through a multi-method investigation carried out on a volcanoclastic deposit discovered in the Grotta del Cervo cave, Pietrasecca, central Italy. Phlogopite crystals are a…
This article reports the use of atmospheric pressure plasma processing to induce chemical grafting of poly(ethylene glycol) methyl ether methacrylate (PEGMA) onto polystyrene (PS) and poly(methyl methacrylate) (PMMA) surfaces with the aim of attaining an adlayer conformation which is resistant to protein adsorption. T…
AIM: Nanosized particles (NPs) enriched in hydroxyapatite and protein isolated from calcified human tissue accelerate occlusion of endothelium-denuded arteries when injected intravenously into rabbits. Since platelet aggregation and secretory processes participate in normal hemostasis, thrombosis and vascular remodeli…
The reaction of 5,10,15-triarylcorrole with 4-amino-4H-1,2,4-triazole provides another example of corrole ring expansion to give the corresponding 6-azahemiporphycene, a novel porphyrin analogue. The facile oxidation of the corrole ring is a required step for the ring expansion and for this reason the reaction fails i…
Feuer am Werk: Die Sol-Gel-Selbstverbrennung ist ein energieeffizienter Ansatz für die Synthese von Metallen wie Co, Ni, Cu, Ag oder Bi und eine Co-Ni-Legierung. Differentialthermoanalyse (DTA) und Massenspektrometrie stützen einen Reaktionsmechanismus, der die Bildung von Metallen oder Legierungen anstelle der Metall…
Experiments have been carried out in a high-temperature, high-pressure rotating electrode (HTHPRE) apparatus under 40 conditions to cover the spectrum of conditions found in oil and gas production pipelines in Western Canada. Each experiment was conducted over a period of 100 h. During the experiments, the electrodes…
Plasma electrolytic oxidation (PEO) is carried out on 6061 Al-alloys in a weak alkaline electrolyte containing NaOH, Na2SiO3 and NaCl. Centered on the correlation of composition and structure, analyses by means of X-ray diffration (XRD), scanning electron microscope (SEM) and energy dispersive spectrometry (EDS) are c…
Abstract The roles of Cl− ions on the shape evolution of various silver (Ag) nanostructures including cubes, triangular bipyramids, and rods/wires in AgNO3/poly(vinylpyrrolidone) (PVP)/ethylene glycol (EG) solution have been investigated by changing the concentration of added NaCl, the reaction solution temperature, a…
3-aminophenol, an organic nonlinear optical material for frequency conversion was prepared by crystallization from aqueous solution XRD pattern reveals that the grown crystal belongs to orthorhombic system having non-centrosymmetric space group of P21 ab . Functional groups are identified by analyzing the vibrational…
We present a symmetry analysis of allowed infrared and Raman modes in graphene and highly oriented pyrolytic graphite. Surface structure for highly oriented pyrolytic graphite is examined using atomic force microscopy. As experimental tools, we used infrared spectroscopic ellipsometry in order to investigate the pseud…
NiTiNb shape memory alloys have attracted much attention in pipe coupling or sealing system because of their large transformation hysteresis upon a proper pre-deformation. In order to clarify the effects of adding Nb on the mechanical properties as well as the transformation behavior of NiTiNb shape memory alloys, Ni4…
Bromo-substituted hydrodipyrrins are valuable precursors to synthetic bromo-chlorins and bromo-bacteriochlorins, which in turn are versatile substrates for derivatization in pursuit of diverse molecular designs. 8-bromo-2,3-dihydro-1-(1,1-dimethoxymethyl)-3,3-dimethyldipyrrin (1) is a crucial precursor in the rational…
Miktoarm block copolymers (A 2 B 2 ) composed of two poly(ε-caprolactone) (PCL) arms and two polystyrene arms (PS) were synthesized by a combination of ring-opening polymerization (ROP) and atom transfer radical polymerization (ATRP). Linear analogue PCL- b -PS diblock copolymer samples were also synthesized in almost…
In this paper, a chitosan-methotrexate covalently conjugated nanoparticles (CS-MTX-TPP NPs) has been developed as a potential delivery system for methotrexate (MTX). MTX was first conjugated to CS by using glutaraldehyde as cross-linked agent, and followed by the process of ionic gelation between MTX-conjugated CS and…
In this work, the complex permittivity of epoxy resin is measured. Earlier, we have shown that the inclusion of nanometric alumina particles (Al2O3), both as-received and pre-processed, improves the ability of a polymeric dielectric (epoxy) to resist degradation when exposed to surface discharges. In this work, we use…
Synthesis and structural diversity of novel aromatic expanded isophlorins are described. Expanded isophlorins are higher analogues of 20pi isophlorin; 30pi isophlorins are the simplest examples of expanded isophlorins. They are synthesized from easy to make precursors. Owing to the sp(2) carbons along the conjugated n…
In the present work we explored the possibility of obtaining Y 2 O 3 :Eu 3+ m-size particles by an ultrasonic spray pyrolysis method. As-prepared sample constitutes of spherical, hollow particles with an average size of 1 to 2 m. Pure, well crystalline, cubic Y 2 O 3 is formed after additional thermal treatment at 800…