Materials Literature
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The thickness of a skin layer on the parts made by a microcellular injection moulding process may influence its properties, including impact and tensile strength, density and sound transmission. Therefore it is necessary to study the variations in skin layer thickness with processing parameters. In this paper, the inf…
A short review of liquid crystal compounds with a low birefringence and ordinary refractive index is presented. Special attention is given to alkylcyclohexylalkyl carbonates, which belong to a family of LCs having high clearing point temperatures, low viscosity, and no as low as 1.442. Examples of multicomponent mixtu…
The frequency dependent dielectric properties of Ni 1 - x Cd x Cr x Fe 2 - x O 4 (x = 0.0, 0.3, 0.5, 0.7 and 1.0) spinel ferrite system are studied by measuring dielectric constant (e'), dielectric loss (D) and conductivity (σ a , c ) at 300 K in the frequency range 100 Hz-2 MHz. The highest value of σ a . c and e' is…
Transient safety characteristics of accelerator-driven systems using advanced minor actinide fuels have been investigated. Results for a molybdenum-based Ceramic-Metal (CerMet) fuel, a magnesia-based Ceramic-Ceramic fuel, and a zirconium-nitride–based fuel are reported. The focus is on the inherent safety aspects of c…
Polycrystalline samples of Pb 3 R 3 Ti 5 Nb 5 O 30 (R = La and Sm) have been synthesized by a high-temperature solid-state reaction technique. X-ray diffraction (XRD) analysis of the compounds showed the formation of single phase compounds in an orthorhombic crystal structure. Studies of dielectric constant (ϵ) of the…
The algological investigations in the protected landscape areas have started at the end of the 19th century. As a result of the intensive floristical and taxonomic research a large number of records were accumulated over a period of last century, which were summarised in a monograph (Németh 2004). In the book mentione…
Transmittance characteristic in a homogeneously aligned liquid crystal (LC) cell driven by a fringe-electric field is investigated as a function of cell gap using the LC with positive dielectric anisotropy. In this device, the fringe-electric field drives the LCs to rotate so that the dielectric torque is electrode-po…
Self-assembly of nanoporous silica shapes is of great interest for modern nanotechnology because of uniform pore size, simplicity, and low cost of production. However, there are two major problems that prevent broad use of the self-assembly process. First, the process brings too broad a variety of the assembled shapes…
Abstract Amphiphilic sugars exhibit both lyotropic and thermotropic liquid‐crystalline behavior. Interestingly, in spite of the abundance of chiral centers in amphiphilic sugars, their liquid‐crystalline phases do not exhibit macroscopic chirality. Herein, we report on the first observation of macroscopic chirality in…
The creep and relaxation of domain walls under an ac electric field that are observed in an ideal model system, periodically poled superionic KTiOPO4 (KTP), appear to occur in different regimes that are separated by a dynamic phase transition at a well-defined frequency, f m = 0.003 Hz, at temperature T = 233 K. The p…
Abstract Chromium ions doped 90 Na 2 B 4 O 7 + (9 – x )PbO + 1TeO 2 and 90 K 2 B 4 O 7 + (9 – x )PbO + 1TeO 2 ( x = 3, 4, 5, 6, 7 and 8 mol%) glasses have been studied by using Electron Paramagnetic Resonance (EPR) and optical absorption techniques. The EPR spectra exhibit a broad resonance signal at g = 4.65 and a na…
A method for polarimetric measurement that uses a discrete space-variant subwavelength dielectric grating is presented. One retrieves the polarization state by measuring the far-field intensity of a beam emerging from the grating followed by a polarizer. The analysis for a partially polarized, quasi-monochromatic beam…
Abstract Rubber particles with different mean diameters obtained from fresh natural rubber latex (FL-latex) were separated by high-speed centrifugation. The small rubber particles (SRP), having mean diameter less than 250 nm, were found to be composed of both low and high number-average molecular-weight ( M n ) rubber…
Lead-free ferroelectric Ba(Ti 1- x Zr x )O 3 (BTZ, x =0.00–0.50) thin films were fabricated on Pt(111)/Ti/SiO 2 /Si(100) substrates by the chemical solution deposition (CSD) process using complex alkoxide solutions. When the Zr content x was increased, the crystallinity of BTZ thin films was changed from the typical r…
Abstract— Photostability of liquid‐crystal (LC) materials and surface alignment layers was evaluated using a UV lamp and a blue laser beam. Both organic polyimide (PI) and inorganic silicon‐dioxide (SiO 2 ) alignment layers were studied under nitrogen environment. Two commercial TFT‐grade LC mixtures (low‐birefringenc…
The density functional theory (DFT) method was used to study the effect of nanoconfinement on the energetics of Mg-MgH2 systems. Varying levels of loading of the Mg/MgH2 particles into a (10,10) carbon nanotube were examined, and the corresponding energetics were computed. A clear trend was observed that, as the level…
Abstract For a given compounding application the selection of the type of processing equipment, the geometry and the operating conditions is always an important challenge. The outcome of this selection process significantly affects the economics of the process, as well as the microstructural distributions and hence th…
We report on the deposition of individual semiconducting single-walled carbon nanotubes (s-SWNTs), suspended in an aqueous solution of sodium dodecylsulfate (SDS), onto predefined electrodes using alternating current dielectrophoresis up to 100 MHz. The successful deposition is attributed to the formation of an ionic…
The dielectric and piezoelectric properties of the 0.24Pb(In 1/2 Nb 1/2 )O 3 -0.42Pb(Mg 1/3 Nb 2/3 )-0.34PbTiO 3 (PIMNT 24/42/34) ternary system was investigated in order to improve thermal stability and voltage-proof nature of electrical properties. A PIMNT 24/42/34 single crystal 25 mm in diameter and 30 mm in lengt…
Antigen-decorated shell cross-linked knedel-like nanoparticles (SCKs) were synthesized and studied as multivalent nanoscale surfaces from which antibody-binding units were presented in a manner that was designed to approach virus particle surfaces. The SCK nanostructures were fabricated with control over the number of…