Materials Literature
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Three novel symmetrical bent-core compounds were synthesized where the terminal alkoxy linkages of the original bent-core mesogen forming a B phase was converted to -alkyl carboxylates. It is found that instead of the B phase, all three compounds exhibit a transition between B' and B mesophases. The physical and elect…
ZnO thin films were epitaxially deposited on platinum∕c-sapphire epitaxial layer using a radio frequency magnetron sputtering method. Xe, rather than Ar, was used as the sputtering gas. The leakage current as well as dielectric loss was suppressed upon use of Xe. Moreover, the full width at half maximum ω scan and sur…
The ring-opening polymerization of L,L-lactide by using immobilized lipase Candida Antarctica (Novozym 435) as a catalyst at a temperature of 100 °C in bulk was conducted. This process was found to yield the corresponding poly(L,L-lactide) (PLLA) with weight-average of molecular weights of about 2,440 and a polydisper…
Solid oxide fuel cells (SOFCs) consisting of an Y-stabilized (YSZ) electrolyte, cathode, and anode support were operated directly using isooctane. The electrical performance of SOFCs operating with in was measured over a temperature range of 600– . Open-circuit voltages achieved slightly over . The maximum power densi…
Thermally stable aramid–silica nano-composites have been prepared via the sol–gel process. Two types of aramid matrices were used. Polyamide chains having no pendant hydroxyl groups were prepared by reacting a mixture of 1,3- and 1,4-phenylenediamine in 65:35 mole ratio with equivalent amount of terephthaloyl chloride…
Periodic mesoporous ethylenesilicas with hexagonal P6mm and cubic Fm3m/Pm3n symmetry were prepared by using divalent surfactant C(16-3-1) and binary surfactant mixtures C(18-3-1) and C18TABr as structure-directing agents, respectively, under basic conditions. A tetramethyldisilazane-based surface silylation was carrie…
A novel photochromic diarylethene 1a with a fluorescent chromophore in the bridge moiety was synthesized. 1a showed fluorescent switching properties in solution with UV/VIS irradiation, accompanying the ring-opening and ring-closed photoisomerization of diarylethene 1a. Addition of acid to a solution of 1a produced pr…
The substituted bis(pyrazolyl)methane ligands RCH(3,5-Me2pz)2(R=SiMe3, CH2Ph, G1, G2, and G3; Gn=Fréchet-type dendritic wedges of generation n) have been prepared starting from H2C(3,5-Me2pz)2. Reaction of these didentate ligands with [NiBr2(DME)] is a straightforward procedure that allows the synthesis of the nickel(…
The photoelectrochemical behavior of anodic films on Al alloys, containing titanium, tantalum, and tungsten (valve metals), has been studied as a function of alloy composition and anodizing conditions. Photocurrent spectroscopy has been used to get information on bandgap and the flatband potential values of different…
Commercially pure titanium (cpTi) was etched using three concentrated acids: 18% HCl, 43% H3PO4, and 48% H2SO4. The bond strengths between five types of veneering composite resin and eight cpTi treatments (involving combinations of sandblasting, acid etching in 48% H2SO4, and vacuum firing) were determined before and…
The equal channel angular extrusion (ECAE) process is an innovative method to refine grain structure; however, it could be highly technical to perform to result in subsequent exotic mechanical properties. This study will demonstrate how easy or difficult of this operation. Yoshida et al. had applied the ECAE process o…
Thermoelectric coolers (TEC) are used in a variety of applications that require extremely stable temperature control. In this paper a fuzzy controller is applied for the cold-end temperature control of a thermoelectric cooler. Fuzzy inference parameters which include the rule base and the shapes of the membership func…
The radical co-polymerization of limonene (Lim) with N-vinyl pyrrolidone (N-VP) initiated by azobisisobutyronitrile (AIBN) in dioxane was carried out at 80 ± 0.1°C for 1 h under the inert atmosphere of nitrogen. The kinetics expression is, R p ∝ [AIBN]0.5 [N-VP]1.0 [Lim]−1.0. The overall activation energy has been cal…
Incorporation of electron accepting units (oxadiazole) into the 2,5-thienylene conjugated chain leads to a significant improvement in the n-doping-undoping redox stability of the resulting polymer.
The behavior of cavitation bubbles in tissue driven by ultrasonic fields is an important problem in biomedical acoustics. The present solution combines the Keller‐Miksis equation for nonlinear bubble dynamics with the linear Voigt model for viscoelastic media and experimental values for the model’s parameters (rigidit…
This paper describes the fundamental process design for achieving microcellular foams using low-density polyethylene (LDPE) in extrusion. Microcellular foams are classified as foams with cell densities larger than 10 9 cells/cm 3 and cell sizes in the order of 10 micrometers. Supercritical CO 2 was used as a blowing a…
was prepared by a precipitation method followed by heat treatment at . The material showed an initial discharge capacity of , which decreased to after 30 cycles. X-ray diffraction showed an irreversible structural change of the material from crystalline to amorphous phase after the first cycle. Contrarily, Raman scatt…
The thermal management of electronics is becoming an increasing concern as industry continues to simultaneously push performance while shrinking the size of electronic devices. Microchannel cooling is a promising technology to accommodate the heat dissipation rates and associated fluxes projected for future generation…
Mixed crystals of (NH 4 ) 2 SbF 5 -K 2 SbF 5 , an electro-optic material have been grown by isothermal evaporation technique. Powder X-ray diffraction method has been used for structural identification and determination of lattice parameters. Load dependent microhardness measurements on this crystal reveal the mechani…
AbstrAct Purpose: Purpose of this article is to extend a complex evaluation of magnesium alloys which requires very often knowledge of elastic-plastic properties at elevated temperatures. These properties are connected with microstructure that is influenced by metallurgical and technological factors and conditions of…