Materials Literature
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A low-K and low-CTE polyimide, CBDA/TFMB (CBDA = 1,2,3,4-cyclobutanetetracarboxylic dianhydride, TFMB = 2,2'-bis(trifluoromethyl)benzidine) was applied to photosensitive materials. Poly(amic acid) (PAA) of this system was modified using imide-containing diamines to control the solubility in alkaline solutions. Copolym…
Permanent magnets based on Sm 2 Co 17 are of significant technological interest due to their high coercivities and elevated Curie temperatures. In this paper we examine the local environment of Zr-doped Sm 2 Co 17 . The presence of Zr in Sm 2 Co 17 -based magnets causes the formation of hexagonal Sm 2 Co 17 lamellae i…
The effect of ionic size of each cation, Mg, Al, and Si, on the thermal expansion of cordierite, Mg 2 Al 4 Si 5 O 18 , was systematically investigated by using molecular dynamics simulations. The cell parameter and the thermal expansion are influenced by the ionic size. The ionic size of Al/Si ion has an opposite effe…
Abstract – Traditional taxonomy of the segmented green algal genus Halimeda is largely based on descriptive expressions of thallus habit, segment shape and anatomical structures. In the course of the last decade, molecular phylogenetic studies have revealed non-mono-phyly and cryptic diversity in several species. In a…
Cement-lime (CL) mortar has a number of properties that are beneficial in masonry mortar applications. The most important property of this mortar type is dependent on the user and application. By varying the ratio of cement to lime, the characteristics of CL mortar can be adapted to specific mortar applications. This…
Effect of hydrostatic pressure on martensitic transformation temperature has been investigated in single crystalline Ni2.14Mn0.84Ga1.02 and Ni2.14Mn0.92Ga0.94 ferromagnetic shape memory alloys, which exhibit P-14M-2M and P-2M transformations, respectively, where P stands for a parent phase. We found that all the marte…
INTRODUCTION: Small angle, between 3 degrees and 10 degrees, X ray scattering is predominantly coherent giving rise to diffraction effects that can be observed as constructive and destructive interferences. These interferences carry information about the molecular structure of the tissue and hence can be used to ident…
The experimental Raman spectra of monoclinic tridymite and its higher temperature orthorhombic modification were successfully simulated with valence force fields applied to the X-ray determined structural parameters. The normal modes contributing to the corresponding Raman peaks in both the phases share essentially th…
Zinc oxide transparent thin films (ZnO) with different thickness were prepared by dc magnetron sputtering and pulsed laser deposition (PLD) techniques using metallic and ceramic targets onto silicon and Corning glass substrates. Structural investigations carried out by Optical Microscopy (OM), Atomic Force Microscopy…
Porous alumina sintered bodies were fabricated by a new gelate-freezing method. The fabricated porous alumina sintered bodies possess highly continuous open pores, and a wide range of pore size (20-200 μm) and porosity (30-70%). Inside the alumina only a few micro voids were observed. Pore size and porosity were able…
This study covers the synthesis of polymers of aniline, o-phenylenediamine, and their copolymers by chemical oxidation in HCl medium. The composition of the copolymers was changed by varying the monomer feed ratio. For examining the effect of composition on copolymer structure and properties, the copolymers were chara…
Factors limiting the strain rate available to superplastic deformation in oxide ceramics are discussed from existing knowledge about high-temperature plastic deformation and cavitation mechanisms. Simultaneously controlling these factors is essential for attaining high-strain-rate superplasticity (HSRS). This is shown…
A magnetic characteristic measurement, a motor characteristic forecast, and an experimental evaluation of various powder magnetic cores were performed aiming at a fixed quantity grasp when the powder magnetic core was applied to the motor core as the magnetic material. The manufacturing conditions were changed, and ma…
The organometallic tetraradical 1,2,4,5-[(eta)7-C7H7)V(all eta]5-C5H4)]4C6H2 has been prepared and structurally characterized. The isotropic EPR spectrum displays 29 a(51V) hyperfine lines, the intensity distribution slightly deviating from binomial. Exchange coupling therefore approaches the strong exchange limit, J(…
Diatoms have attracted the interest of those involved in nanotechnology and the development of this discipline for research and practical application. These microorganisms exhibit self-assembly of silica on the micrometer scale, with parts of diatoms measuring on the nanometer scale. They exhibit a wide variety of sha…
Effect of anisotropy in grain boundary energy on kinetics of grain growth and topological properties of grain structure in two dimensions was simulated by the phase field model. Misorientation distribution in a system with anisotropic grain boundary energy is found to be time-dependent. Fraction of low angle grains bo…
Ultra-high-resolution X-ray crystallography of macromolecules (i.e. resolution better than 0.8 Angstroms) is a rising field that promises to provide new insight into the structure-function relationships of biomacromolecules. The picture emerging from macromolecular structures at this resolution is far more complex tha…
Repassivation kinetics of duplex stainless steel (DSS) 2205 was examined using a scratched electrode technique in 4 M NaCI solution at 90°C with exploring the relation between the repassivation kinetics and the susceptibility to stress corrosion cracking (SCC) measured by slow strain rate test. The repassivation kinet…
A highly fluorescent dual-dye, comprising 4,4-difluoro-8-(aryl)-1,3,5,7-tetramethyl-2,6-diethyl-4-bora-3a,4a-diaza-s-indacene and 1-pyrenyl fragments linked orthogonally at the pseudo-meso position, displays a wide choice of excitation wavelengths due to intramolecular energy transfer and undergoes efficient fluoresce…
The resistance of aluminium foam against projectile penetration has been studied experimentally and analytically and the results are presented in this paper. The penetration depth of a rigid, flat-nosed projectile into an aluminium foam target was measured at various impact velocities between 20 m/s and 120 m/s. An an…