Materials Literature
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Abstract Polymer/silica and polymer/Laponite nanocomposite colloids with various morphologies have been elaborated through emulsion polymerization using a polymerizable organosilane (route I) and a methyl methacrylate‐terminated macromonomer (route II) as coupling agents. Depending on the synthetic strategy and on the…
The synthesis, characterization and mesomorphic properties of the first examples of novel disulphide‐bridged alkoxycyanobiphenyl dimers are reported. The thermal behaviour of these mesogens was investigated by polarizing optical microscopy, differential scanning calorimetry and X‐ray diffractometry. The dimers with a…
Abstract A new general approach to the direct formation of bipolar devices from heterogeneous colloids is suggested. By using surface‐force theory and direct measurements, combinations of conductive device materials between which short‐range repulsive forces exist in the presence of an intervening liquid, and use thes…
The aim of present work was to study the interaction between human plasma protein-albumin (Alb) and immunoglobulin G (IgG) and the surfaces of two kinds of diamond-like carbon (DLC-A and DLC-B) and titanium (Ti) film. Fourier transform infrared spectroscopy (FTIR) was used to perform both quantity investigation and se…
Compositions of oxysalt, sulfosalt, seleniosalt, tellurisalt, and fluosalt minerals all follow the same generalizable patterns with regard to hardness or softness of cations, and with regard to ionic potential. For example, the hard F 1- anion forms simple fluosalt minerals (fluoborates and fluosilicates) with hard ca…
The structure and some properties of polycrystals produced by sintering nanocrystalline powders of the dense modifications of shock—wave-synthesized BN have been studied. The sintering was conducted at a static pressure of 7.7 GPa and temperatures from 1100 to 1800° C. The highest density (3 g/cm 3 ) and microhardness…
A series of dialdehyde cellulose samples with varied aldehyde content were prepared by oxidation of bacterial cellulose with sodium periodate. The X-ray diffractometry profile showed that the crystallinity degree of bacterial cellulose was 66%, but that of the dialdehyde cellulose (containing 12% aldehyde ) was 56%. T…
Abstract For the purpose to prepare precursor materials for the silicon hard coatings, the hydrosilylation reactions of α, ω–bis(trimethylsiloxy)methylhydridesiloxane to trialkoxyvinylsilanes in the presence of platinum hydrochloric acid (0.1 M solution in THF), Karstedt's catalyst (Pt 2 [(VinSiMe 2 ) 2 O] 3 ) and pla…
In summary, the techniques of drug delivery and hyperthermia using nanoparticles have the potential to decrease side effects while increasing the cure rate of cancer patients. These techniques promise a substantial improvement over chemotherapy and radiation. Over the next few years, if the research conducted on nanop…
We succeeded in growing carbon nanotubes in a photoelectron spectroscopy analysis system using thermal chemical vapor deposition and analyzed the chemical states of the Co catalysts by in situ X-ray photoelectron spectroscopy before and after the growth. The carbon nanotubes were grown in an ethanol ambient at about 4…
<abstract language="eng">The chemical composition of the ethanolic extract of the leaves and roots from Philodendron imbe Schott was investigated. The main constituents isolated the leaves were beta-sitosterol one polyprenoid hexaprenol, and 6beta-hydroxy-stigmast-4-en-3-one, a steroid, not yet reported in the Philode…
Abstract Pulsed discharges of methane gas at atmospheric pressure were generated using high voltage power supply (20 kV–25 kHz) to produce the carbon. The pulsed discharge of methane gas was generated between two sharp wolfram electrodes. It brings out carbon and acetylene and other hydrocarbons at the same time. In t…
We report on the effects of temperature and DC magnetic field on the modulated non-resonant microwave power absorption measurements at 8.8-9.8 GHz, in powder samples of iron niobate, FeNbO4 (FN), in the monoclinic phase (wolframite-structure). Two techniques recently implemented are used: magnetically modulated microw…
Phase transformations in the oxide binary section of the UO 2 -FeO-Fe ternary system were studied. The melting onset point of the UO 2 -FeO heterogeneous system (1335±5°C) was determined and the fusion curve of this system was constructed. The limiting solubility of FeO in the UO 2 solid solution was measured. The cha…
In a recent paper Wu et al. [J. Appl. Phys. 97, 103908 (2005)] reported on characteristic features of the temperature (T) dependence of electrical resistivity (ρ) in polycrystalline La0.7Ca0.3Mn1−xCrxO3 (x=0.05 and 0.1) manganites. In particular, a shallow minimum at T&lt;50K and coexisting two maxima were observe…
Article SYNTHESIS OF SUBSTITUTED FLAVONES AND ARYLCHROMONES USING Ρ AND Si KEGGIN HETEROPOLYACIDS AS CATALYSTS was published on February 1, 2007 in the journal Heterocyclic Communications (volume 13, issue 1).
The present paper reports the effect of oxygen activity p(O2) on Nb segregation in a polycrystalline specimen of Nb doped TiO2 (2·91 at.-%). The determined segregation induced enrichment factor following annealing at 1773 K in p(O2) = 10 Pa and p(O2) = 21 kPa is 3·1 and 7·3 respectively. The data on the effect of p(O2…
The Schiff condensation of 2-pyridinecarboxaldehyde N-oxide with 2-aminophenol gave a tridentate ligand, abbreviated as Hpoxap. This ligand bears the functionality of a terminating group in a trinuclear complex [Mn(poxap)Mn(ac)4Mn(poxap)], where ac- is the acetate bridge. The magnetic data were treated simultaneously…
In-pile flow-boiling experiments were performed to investigate the possible enhancement of heat transfer by the radiation induced surface activation (RISA) effect. The test section was a 2-mm diameter 100-mm long bore in a SUS-316L stainless steel block heated electrically. The test section, housed in an irradiation c…
A tunable capacitor based on a ferroelectric thin film grown on a dielectric substrate is a promising component for reconfigurable and tunable devices for numerous RF and microwave applications such as phase shifters, tunable filters, and tunable matching networks. The goal of this paper is characterization of the ins…