Materials Literature
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Abstract The conditions of processing and gas sensing of polyaniline (PANi) blends with polyvinyl acetate (PVAc), polystyrene (PS) and polyvinyl chloride (PVC) were investigated. Flexible, free‐standing and stretchable films of various blends compositions were obtained by casting. The mechanisms of the conducting ble…
Homogeneous and nanosized (28 nm crystallite size) doped‐ZnO ceramic powders were obtained by a metallorganic polymeric method. Calcining and granulating resulted in green compacts with uniform powder packing and a narrow pore‐size distribution (pore size 19 nm). Dense ceramic bodies (>99% of theoretical) were fabr…
Pb(Zr, Ti)O 3 (PZT) thin films with (100) preferred orientation were prepared using metalorganic chemical vapor deposition on LaNiO3 (LNO) buffered platinized Si with thickness varying from 25–100 nm. The dependence of electrical properties of PZT films on thickness was studied using several techniques, including pola…
Abstract An extension has been made of previous analyses of peak area intensities for elemental spectra in digital Auger and x‐ray photoelectron databases. The intensities, instead of being analysed after removal of a background derived from the Tougaard Universal cross‐section, are now analysed after removal of the e…
The photophysical properties of two perylene−porphyrin dyads have been examined in detail with the aim of expanding the functional utility of these constructs for molecular optoelectronics applications. The dyads consist of a perylene-bis(imide) dye (PDI) connected to either a magnesium porphyrin (Mg) or a free base p…
A series of optically tunable amphiphilic conjugated polymers, poly(2-hydroxy-5-alkoxy- p -phenylene) ( 1 ) containing long alkyl chains, were prepared by Suzuki polycondensation using 2,5-dibromo-1-benzyloxy-4-alkoxybenzene and bis(boronic ester) monomers. All polymers showed good solubility in common organic solvent…
RATIONALE AND OBJECTIVES: To summarize the physicochemical characterization, pharmacokinetic behavior, and biological evaluation of P792, a new monogadolinated MRI blood-pool agent. METHODS: The molecular modeling of P792 was described. The r1 relaxivity properties of P792 were measured in water and 4% human serum alb…
Abstract Many attempts have been made to improve the fracture toughness of brittle materials such as ceramics. Most of the methods developed so far make use of metallurgical processes, for example, phase transformation, refining of grains, formation of composite materials. However, these methods can not be applied uni…
Abstract Raman spectra of LiK 0.8 (NH 4 ) 0.2 SO 4 were obtained as a function of applied pressure. The measurements were carried out using a microscope to focus the light into a spot size of 2 µm, in order to avoid probing a multi‐domain sample. With increasing pressure, many of the Raman peaks are shifted towards hi…
Abstract The pitting corrosion behaviour of the austenitic stainless steel alloys 31 and A 351 with different surface treatments in a technical MgCl 2 solution was investigated. Potentiometric current density-potential measurements were carried out, and critical repassivation temperatures were determined, using a galv…
In cases of certain accelerated sulfur vulcanizing systems, the curemeter traces do not run the usual way but consist of two more or less distinct plateaus. The shape of the cure curves was newly evaluated based on cure curve derivation. The latter provides the possibility of distinguishing the inflection points even…
The search for the hexatic phases such as smectic-F and G in N-(p-n-alkoxybenzylidene)-p-n-alkyl anilines, nO.m s series has revealed that a number of higher homologues of this series exhibit a direct isotropic liquid to hexatic smectic-F and G phases in addition to the lone compound hither to known in nO.m series viz…
The results of experimental observations of a carrier charge transfer and influence them on electrooptical response NLC with Δ∈>0 are given. Main investigations have been carried out with samples with distance between electrodes 3000 and 260 μm. Ions with known parameters (copper Cu+) were injected. It has been shown…
A new mesogenic homologous series with broken alkoxy chain at the terminus of long polarizable molecules having following general formula have been synthesized. RO-C6H4-COO-C6H4-CH=N-C6H4-COOCH2CH2OCH2CH3 Where, R=-CnH2n+1; n=1 to 8, 10, 12, 14 and 16. All the members exhibit enantiotropic mesomorphism. Methoxy deriva…
The nature of parent materials strongly influences soil development in the southeastern US Piedmont. In this region, most parent materials (saprolite) form from metamorphic and igneous felsic and mafic rocks. Although most soils in felsic terrains are acid and kaolinitic, soils formed from mafic parent materials range…
Zigzag defects in surface-stabilized ferroelectric liquid crystals (SSFLCs) originate from the structural transformation from C1 to C2 chevrons during the cooling process. This transformation occurs so as to accommodate the increasing cone angle of the FLC under the constraint of the surface anchoring. Based on this s…
New bismaleimides containing ether groups in the backbone were synthesized and characterized. They were prepared by reacting maleic anhydride with various diamines (having ether groups). Monomers were characterized by infrared and proton nuclear resonance spectroscopy as well as by elemental analysis. The thermal prop…
Abstract An azobenzene derivative [4‐(6‐oxo‐hexacarboxylic acid)‐3′‐trifluoromethyl‐azobenzene] was synthesized and transferred onto a solid substrate by the Langmuir–Blodgett (LB) technique. The films undergo reversible wettability changes upon irradiation with ultraviolet (UV, 365 ± 10 nm) and visible (436 ± 10 nm)…
Abstract Crystal growth experiments in the system BaO–Al 2 O 3 yielded single crystals of a new Ba oxo-aluminate with composition Ba 4 Al 2 O 7 . The title compound is orthorhombic, with cell parameters a = 11.3126(5), b = 11.7045(9), c = 27.1850(14) Å, space group Cmca . The structure was solved by direct methods fol…
Complex dielectric permittivity of 4-n-butyl-4′-thiocyanobiphenyl has been investigated in the frequency range from 0.1 Hz to 106 Hz in the smectic E and isotropic liquid phases. In the smectic E phase dispersion with unexpectedly low relaxation frequency has been observed. It was related to the reorientation of the m…