Materials Literature
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Conducting polymer composites of polyvinylferrocene and polypyrrole (PVF/PPy) were synthesized chemically by the in situ polymerization of pyrrole in the presence of PVF using FeCl3 as oxidant. Acetic (CH3COOH) and boric (H3BO3) acids were used as the synthesis medium. Effects of the synthesis medium on the properties…
Different stages of the study of taxonomical composition of centric diatoms in the Selenga River are considered. A revision of the species composition and a general systematic list are made. New for the Selenga River diatom species are discovered. The role of small-sized centric diatoms in different years and vegetati…
Abstract The substituted monomers 4a , c , d, 5a , b, 6a, 7a , b , and 8a of novel poly(diphenylamines), possessing the respective photochromic groups, were synthesized by the Stille cross‐coupling methodology ( Scheme ). The hyperbranched structures were characterized by 1 H‐ and 13 C‐NMR spectroscopy. The obtained m…
Vertical alignment of carbon nanocoils (CNCs) relative to a substrate in a polymer matrix has been demonstrated using dielectrophoresis under the parallel-plate electrode configuration. The CNCs were aligned toward the electric field with an AC frequency of 100 kHz and form a small aggregation of a CNC chain by the di…
Abstract Calcium carbonate biominerals are frequently analysed in materials science due to their abundance, diversity and unique material properties. Aragonite nacre is intensively studied, but less information is available about the material properties of biogenic calcite, despite its occurrence in a wide range of st…
The chemical reactions of transition metal clusters in the gas phase have aroused considerable scientific interest and are also of critical scientific importance. For example, these reactions are involved in the synthesis of single-walled carbon nanotubes, which are considered ideal materials because of their outstand…
An investigation has been made of the solution chemistry associated with the concentrated solutions formed by seawater evaporation on hot duplex stainless steel (DSS) and super duplex stainless steel (SDSS) pipe work. The system has been simulated by boiling the seawater until the water content was reduced by about 40…
The effects of two plasticisers, one phthalate and one sulphonic acid ester, on the photodegradation of TiO 2 pigmented polyvinylchloride films are reported. The loading of each plasticiser was altered in the range 0–70% relative to the polyvinylchloride and the effects on the rates of photomineralisation were determi…
The long afterglow phosphor CaAl2O4:Eu2+,Nd3+ was prepared by the high temperature solid-state reaction method, and the influence of La3+ and Dy3+ on the properties of the long afterglow phosphor was studied by X-ray diffraction (XRD), photoluminescence (PL), and thermoluminescence (TL). The XRD pattern shows the host…
In this work, using photoacoustic Fourier transform infrared spectroscopy (FTIR) we have studied the structural distortion of clay crystal structure in organically modified montmorillonite (OMMT) and polymer clay nanocomposites (PCN). To study the effect of organic modifiers on the distortion of crystal structure of c…
Commercially available multiwalled carbon nanotubes (MWNT) were chemically modified by amine, acid and silane and their ethylene vinyl acetate (EVA) based nanocomposites were prepared. Unmodified and modified nanotubes were characterized by thermogravimetry, X-ray diffraction, Raman spectroscopy, X-ray photoelectron s…
Few studies have been carried out on the failure processes of low voltage distribution cables. This is mainly due to their excellent track record of high reliability, and their use of traditional technologies. Growing quantities of aged cable within the network now make management of these assets an important issue. T…
This is a first case ever reported on the fullerene-based low toxic nanocationite particles (porphyrin adducts of cyclohexl fullerene- C 60 ) designed for targeted delivery of the paramagnetic magnesium stable isotope to the heart muscle providing a sharp clinical effect close to about 80% recovery of the tissue hypox…
Mg alloys are the lightest structural metallic materials, and are very attractive for aerospace applications. But their applications are limited owing to their poor workability, moderate strength and poor corrosion resistance. ZK30 Mg alloy (Mg–3·0Zn–0·5Zr (wt-%)) shows better strength and workability due to the prese…
Nanocrystalline PhS thin films have been deposited on glass substrates by Chemical Bath Deposition (CBD) technique using polyvinyl alcohol (PVA) in the preparation of matrix solution. Four matrix solutions with four different molarities (0.25 to 1.00) of lead acetate are used to deposit the films. The X-ray diffractog…
Dielectric and ac impedance studies have been carried out on undoped and Mg (0.5 and 1mol%) doped near-stoichiometric lithium tantalate (SLT) single crystals. No particularly significant qualitative change is observed in the nature of the ferroelectric phase transition on doping by Mg. However, an anomaly is observed…
Continuum solvent models have been shown to be an efficient method for the calculation of the energetics of biomolecules in solution. However, for these methods to produce accurate results, an appropriate set of atomic radii or volumes is needed. While these have been developed for proteins and nucleic acids, the same…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTPolar Nematic Phase in Lyotropic Solutions of Poly(γ-benzyl glutamate) and Its Temperature Instability As Detected by SHG MeasurementChu-Chun Yen*, Yoshiaki Taguchi, Masatoshi Tokita, and Junji WatanabeView Author Information Department…
Optical absorption and fluorescence spectra of Pr 3+ doped borosilicate glasses of the composition (in wt.%) 68.94 SiO222.55 Na2O-1.91 CaO-4.96 K2O -0.85 B2O3-0.29 As2O3-xPr6O11 where x = 0.0, 0.2, 0.3 and 0.5 have been studied in UV-VIS/NIR regions. Judd-Ofelt theory has been applied to the f ↔ f transitions for eval…
Multi‐walled carbon nanotube (MWCNT)/polythiophene (PTh) composites have been prepared by in situ chemical oxidative polymerization. PTh is synthesized onto the sidewalls of the MWCNTs, which play a role as hard templates for PTh to produce one‐dimensional nanostructures. The morphology and structures of the MWCNT/PTh…