Materials Literature
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Carbon nanofibers (CNF) with diameters of 20-130 nm with different morphologies were obtained from a botanical hydrocarbon: Turpentine oil, using ferrocene as catalyst source and sulfur as a promoter by simple spray pyrolysis method at 1,000 °C. The influence of sulfur concentration on the morphology of the carbon nan…
The synthesis and phase behaviour are described of new side‐chain liquid crystal polyacrylates (9a–9d) with a 3,5‐isoxazoline ring in their mesogenic core. The new homopolymers were synthesised by free radical polymerisation. Phase transition temperatures exhibited dependence on degree of polymerisation and on termina…
Using the complex variable function method and the technique of conformal mapping, the anti-plane shear problem of an elliptic hole with asymmetric collinear cracks in a one-dimensional hexagonal quasi-crystal is solved, and the exact analytic solutions of the stress intensity factors (SIFs) for mode III problem are o…
Abstract Hexagonal, single‐crystalline, diamond nanoplatelets synthesized by microwave plasma (MP)CVD on Au‐Ge alloy and nanocrystalline diamond (nc‐diamond) film substrates, respectively, are reported. On the nc‐diamond matrix, hexagonal diamond nanoplatelets can grow to a thickness of as little as approximately 10 n…
There is much current interest in nanostructured materials (nanotubes, nanobelts, nanospheres, etc.). Their crystal structures can differ from those of the equivalent bulk materials. Determining these differences is important in understanding how the properties of nanomaterials differ from those of the bulk. Establish…
We report a detailed theoretical investigation on the functionalization of semiconducting (10,0) and metallic (6,6) single-walled carbon nanotubes (SWNTs) with a series of metalloporphyrin (MP) complexes (MP = CoP, NiP, CuP, and ZnP) by using density functional theory (DFT) calculations. We find that similar to the fr…
4-( p -Triphenylmethylphenoxy)isoindoline-1,3-diimine was synthesized starting from 4-( p -triphenylmethylphenoxy)phthalodinitrile obtained by the reaction of 4-nitrophthalodinitrile with 4-(triphenylmethyl)phenol. The former was reacted with phenylacetic acid in the presence of zinc oxide to obtain zinc complexes of…
High temperature properties such as electrical conductivity (σ) and resonance behaviour of stoichiometric lithium niobate (LiNbO3) are determined in the temperature range from 20 to 950 °C. The activation energy of the conductivity is found to be 0.9 and 1.7 eV in the temperature range from 500 to 750 °C and from 800…
Liquid crystal (LC) devices can be used as amplitude modulators and phase modulators. Most LC devices are polarisation‐dependent and require at least one polariser. As a result, the optical efficiency is greatly reduced. In this paper, we review some of our recently developed polarisation‐independent LC devices. For a…
Thermoplastic polyurethane (TPU) combines the property characteristics of high quality polyurethane elastomers with the processing efficiency of thermoplastics. Foaming of TPU material inputs for existing applications also leads to improved material properties for new applications. The mixture of exo- and endothermic…
In this paper an efficient method for detection of ferroresonance in distribution transformer based on wavelet transform is presented. Using this method ferroresonance can be discriminate from other transients such as capacitor switching, load switching, transformer switching. Wavelet transform is used for decompositi…
An optically transparent bulk nonlinear optical active single crystal of l -alanine cadmium chloride was grown up to a dimension of 100 mm length and 15 mm diameter with the aid of a modified uniaxial Sankaranarayanan−Ramasamy crystal growth method along the (101) plane. The crystal was subjected to X-ray diffraction…
Sum-Frequency Vibrational Spectroscopy (SFVS) has been used to investigate the effect of nitrogen-flow drying on the molecular ordering of Layer-by-Layer (LbL) films of poly(allylamine hydrochloride) (PAH) alternated with poly(styrene sulfonate) (PSS). We find that films dried by spontaneous water evaporation are more…
Zirconia powders doped with different amounts of dopants (CeO2, Gd2O3, and CaO) were synthesized by a citrate technique. X-ray diffraction for samples sintered at 1500 °C revealed that the zirconia ceramics were stabilized in the cubic phase above 12 mole % CaO and 10 mole % Gd2O3, while tetragonal zirconia is obtaine…
Hollow microcapsules containing polymeric micelles in their walls were fabricated by alternating assembly of poly(allylamine hydrochloride) (PAH) and poly(styrene- b-acrylic acid) (PS- b-PAA) micelles on MnCO(3) microparticles followed by sacrificing the templates in acid solution. The successful formation of PAH/mice…
We present here a detailed study of the controlled release of amino acid derived amphiphilic molecules from the internal pore structure of mesoporous nanoparticle drug delivery systems with different structural properties; namely cubic and hexagonal structures of various degrees of complexity. The internal pore surfac…
Microcrystals of potassium hydrogen hexaniobate (K 1.8 H 2.2 Nb 6 O 17 · n H 2 O) and nanoscrolls derived from them were suspended in an aqueous solution of tetramethyl orthosilicate and then subjected to a static homogeneous 11.74 T magnetic field as the silicate solution formed a gel. After supercritical drying of t…
Abstract An investigation based on an ultra‐soft, pseudo‐potential, density functional theory (DFT) method, using a generalized gradient approximation (GGA) under periodic boundary conditions, is performed in order to investigate the effect of substitutional nitrogen on the CH 3 adsorption and the H abstraction from t…
The chelating characteristics of 1-(aminoformyl-N-phenylform)-4-ethylthiosemicarbazide (H3APET) towards Cr3+, Fe3+, Mn2+, Co2+, Ni2+, Cu2+, Cd2+, Zn2+ and ions have been investigated. The structures of the isolated complexes were assigned based on elemental and thermal analyses, spectra [IR, UV-visible, 1H NMR, ESR (f…
Dielectric and magnetic properties of selected rare earth ferrites, LnFe2O4 (Ln=Y,Er,Yb), have been investigated. All these materials show ferroelectricity near the ferrimagnetic transition temperature around 250 K. More importantly, they exhibit a change in the dielectric behavior on the application of magnetic field…