Materials Literature
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A new positive-working polyimide having photosensitive o-nitrobenzyl ester group as side substituent, poly{1,4-phenyleneoxy-1,4-phenylene-3,6-di[4-(o-nitrobenzyloxy)carbonylphenyl]pyromellitimide} (ODA-PI-Nb), was prepared and its aqueous alkali-developability and photosensitivity were investigated. ODA-PI-Nb was synt…
Two widely different rubbers, viz. EPDM and s-SBR have been selected in the present study. The influence of the basicity, the crystal structure and the ability to form complexes of various metal oxides were studied. It was observed that neither CdO, PbO, BaO, CaO, MgO and BeO are proper substitutes for ZnO as activato…
The addition of particulate fillers (woodflour) and short fibers (sisal) into an unsaturated polyester matrix was performed and analyzed. The efficiency of the filler treatment was carefully investigated, in particular, esterification with two different anhydrides, maleic anhydride (MAN) and an alkenyl succinic anhydr…
Novel chloro-subphthalocyaninatoboron()(Subpc) derivatives with six thioether at the 2 and 3 positions of peripheral benzene (Subpc(SR)) such as chloro-[2,3,9,10,16,17-hexakis-ethylthio-subphthalocyaninato]boron()(Subpc(SEt)) and chloro-[2,3,9,10,16,17-hexakis-benzylthio-subphthalocyaninato]boron()(Subpc(SBz)) were sy…
Eu3+ doped Lu2SiO5 (LSO) has been prepared by sol-gel chemistry. X-Ray diffraction showed that only the monoclinic phase corresponding to LSO is observed, even for doped samples. X-Ray absorption measurements were performed at both Lu and Eu LIII edges to investigate the substitution of Eu3+ for Lu3+ in LSO. Lutetium…
The equation T x sigmaDC(T) = alpha x exp[--(E*/kappa(B)T)--gamma x exp(E*/kappa(B)T)] has been used to understand the non-Arrhenius behaviour of the DC conductivity in supercooled glass-forming melts. Here, alpha, gamma and E* are parameters, E* denoting the activation energy for an elementary displacive step. Unlike…
Ferrocene-bridged bisporphyrins have been synthesized by the condensation of corresponding dipyrromethane-derived diols with a bisdipyrromethane. Purification of the final compounds has been achieved without chromatography. The specific geometry of these bisporphyrins makes them valuable starting points for building c…
We demonstrate a novel method for fabricating glass microlens (arrays) with single step on conventional lens surface. In this method, the glass microlens can be achieved by only one step with sol gel glass material. The microlens aperture and focus length can be controlled easily and uniformly. The fabricated sample s…
Equilibrium molecular dynamics have been used to simulate systems of trifunctional dendrimers in an explicit Lennard-Jones solvent. Solution and solvent viscosities, calculated using the Green–Kubo relation, have been used for the first time to determine the intrinsic viscosity of dendrimers of generations three to se…
Thickness measurements of diamond-like carbon (DLC) films by electron energy-loss spectroscopy (EELS) and electron holography are discussed. In order to evaluate the thickness by EELS and electron holography, the mean free path for inelastic scattering and mean inner potential of DLC films were determined precisely, r…
Crystal faces of aragonite in various orientations were dissolved in water or in a dilute aqueous acetic acid. Facet formation processes were observed in situ using atomic force microscopy (AFM). At the polar (001) surface, which gave atom-resolved AFM images in air, less polar {112} facets were developed in water. At…
This study investigates the characteristics of IMI (ITO–Metal–ITO) transparent conductive thin films, with an Ag–Ti alloy intermediate layer. Multi-layers were deposited by sputtering. ITO–AgTi–ITO films have better transmittance than ITO–Ag–ITO films in the visible wavelength range. The maximum transparency is 94% af…
The crystalline state of terbium-containing yttria is one of the important candidates for uses to ultraviolet- and electron-excited green phosphors. To increase the intensity of green emission, structural design of the polycrystalline Y2O3:Tb was carried out using a chemical-vapor-deposition technique operated under a…
The iron(II) and manganese(II) complexes of the N(7) Schiff-base condensate of tris(3-aminopropyl)amine with 1-methyl-2-imidazolecarbaldehyde and the manganese(II) complex of the N(7) Schiff-base condensate of tris(3-aminopropyl)amine with 4-imidazolecarbaldehyde are high-spin mono capped octahedral seven-coordinate c…
Certain aluminum alloys exhibit electrochemical activation in chloride media as a result of annealing at temperatures above , attributed to the enrichment of trace element Pb at the oxide-metal interface. Activation is manifested by a significant negative shift in the corrosion potential and a significant increase in…
Proper modifications are required when a split Hopkinson pressure bar (SHPB) is used to determine the dynamic compressive properties of polymeric foams. Pulse shaping is necessary to ensure valid testing conditions: constant strain-rate deformation under dynamically equilibrated stresses, which need to be experimental…
Dynamical mean-field theory (DMFT) is a non-perturbative technique for the investigation of correlated electron systems. Its combination with the local density approximation (LDA) has recently led to a material-specific computational scheme for the ab initio investigation of correlated electron materials. The set-up o…
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…