Materials Literature
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Laterally substituted by fluorine atoms 4-cyanophenyl 4-(4-pentylbenzoyloxy)-benzoates have been prepared and their phase transition temperatures, enthalpies and dielectric properties upon frequency were evaluated. The novel compounds exhibit a broad range of nematic mesophase, large positive dielectric anisotropy cha…
This work presents the measurement of the dielectric anisotropy of selected nematic liquid crystals in the 0.01–6 GHz range, and comparison of the measurements with the birefringence values at optical frequencies. The effect of alignment on the reproducibility of dielectric measurements was also measured. It was found…
In this study, we report on the frequency dependence of dielectric and conductivity properties of a Ba6 - 3xLa8 + 2xTi18O54 compound with x = 0.6 in a temperature range of 283–523 K. X-Ray diffraction confirmed the formation of single-phase compound in the orthorhombic system. Dielectric constant was observed to be de…
Using density functional theory, we study H 2 dissociation on Ti/Al(100) alloy surfaces, modeled by different Ti coverages varying from 1/4 to 1 monolayer. The minimum barrier height for H 2 dissociation depends on the specific Ti coverage on the Al surface. In view of experimental information on Ti in hydrogenated an…
The adhesion of human leukocytes to nanostructured surfaces with different chemical properties and the effect of protein adsorption were investigated. Self-assembled monolayers (SAMs) prepared with mixtures of methyl- and hydroxyl-terminated alkanethiols in different percentages on gold were used. The surfaces were pr…
Equal channel angular extrusion (ECAE) is a relatively novel forming process to modify microstructure via severe plastic deformation without modification of the sample cross section. In this study, an optimized design of die geometry is presented, which improves homogeneity of the plastic deformation and decreases the…
Abstract Raman spectroscopy has been used to study the rare‐earth mineral churchite‐(Y) of formula (Y,REE)(PO 4 ) ·2H 2 O, where rare‐earth element (REE) is a rare‐earth element. The mineral contains yttrium and, depending on the locality, a range of rare‐earth metals. The Raman spectra of two churchite‐(Y) mineral sa…
Zeolite A and MCM-41 have extensive applications in basic science, petrochemical science, energy conservation/storage, medicine, chemical sensor, air purification, environmentally benign composite structure and waste remediation. However, the use of zeolite A and MCM-41 in these areas, especially environmental remedia…
Dynamical heterogeneities exist ubiquitously in materials near a dynamical arrest transition, such as glass formation or gelation. Among the readily discernible features of heterogeneous dynamics is a non-Gaussian exponential component in the distribution of the constituent particle displacements that is not understoo…
The gamma-Ga(2)O(3)-Al(2)O(3) mixed oxides with a spinel structure were prepared by the solvothermal reaction of gallium acetylacetonate and aluminum isopropoxide in diethylenetriamine. In the crystal structures of the catalysts obtained by the calcination of these mixed oxides, Ga(3+) and Al(3+) ions preferentially o…
Field electron emission from single-walled (5,5) carbon nanotubes was simulated with a quantum chemistry method, emphasizing the effect of distance between the anode and apex. The emission probability and the field enhancement factor were obtained for different anode-apex separations with two representative applied ma…
Abstract Thermoplastic elastomers from blends of styrene‐vinylacetate copolymer latex (S‐VAc) and natural rubber latex (NRL) as a hydrophilic/hydrophobic blend have been prepared by the solution‐casting technique. Compatibility between S‐VAc and NRL was confirmed at all ratios of the blend mixing through the measureme…
Born-Oppenheimer molecular dynamics simulations have been performed to investigate the proton-transfer mechanism in liquid phosphonic acid at different temperatures. The transfers are observed if additional charge carriers are present. The liquid phosphonic acid has been characterized by pair-distribution functions, s…
Abstract Polyamide 6 (PA6) fibers were coated with polycarbonate‐based thermoplastic polyurethanes (CPUs) by dip‐coating method and cured at 100°C for 24 h. There were abrupt increases in tensile strength and elongation at break of the CPU‐coated PA6 fibers. This was due to the increase of crystallinity from the struc…
Chiral isotropic metamaterials with a negative index of refraction design consisting of arrays of a sole structure are proposed. The Cn point group is selected based on its chiral and isotropic properties. A circuit analysis model is obtained for the double negative NIR passband design. The structure's orientation pro…
Thrombotic complications of long-term blood-contacting devices can be avoided by formation of an endothelial cell layer on the blood-contacting surface. The endothelial cells form a bioactive boundary between the synthetic surface and blood, regulating haemostasis and inflammation. Biofunctionalization of synthetic bl…
The aim of this study was to compare the effect of monomers, prepolymers, and nanosilica on the scratch and abrasion resistance of nanocomposite coatings. Ultraviolet (UV) and electron beam (EB) curing were used to cure the nanocomposite coatings. The effect of monomers, prepolymers and nanosilica particles on the vis…
A Landau-Ginzburg continuum model for describing a periodic superlattice consisting of alternating ferroelectric and paraelectric layers is presented. An interface coupling term is introduced to describe the interaction at the interface between the two constituent layers. Explicit expressions to describe the order par…
We prepared a series of well-defined polyfluorene-based copolymers by using polyfluorene (PF) macroinitiators to initiate atom transfer radical polymerization (ATRP) of γ-methacryloxypropyltrimethoxysilane (MPS). The chemical structures of hydroxy-functionalized PF (PFOH), PF macroinitiators (PFBr), and polyfluorene-…
Density functional theory is used to evaluate the adsorption of carbon on stepped (211) cobalt surfaces. It is found that the 4-fold step hollow sites on (100) planes are the most stable adsorption sites for carbon, followed by the 3-fold hcp sites located in (111) terraces where adsorption per carbon atom is 0.7−0.9…