Materials Literature
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Expansion and contraction in regioregular and regiorandom poly(3-alkylthiophene), PAT films (alkyl=hexyl and dodecyl) upon electrochemical oxidation and reduction in organic electrolyte solvents are studied. It is found that the deformed films consist of two components, which respond to electrochemical cycle and creep…
A series of polyhydrazides and poly(amide hydrazide)s bearing ether and cardo groups were prepared from three bis(ether carboxylic acid)s, 1,1-bis[4-(4-carboxyphenoxy)phenyl]cyclohexane, 5,5-bis[4-(4-carboxyphenoxy)phenyl]-4,7-methanohexahydroindan and 9,9-bis[4-(4-carboxyphenoxy)phenyl]fluorene, or their diacyl chlor…
In solution, the growth rate and the crystal habit are influenced by a number of factors such as supersaturation, temperature, pH of the solution, cooling rate, agitation, viscosity, initial state of the seed crystal and the presence of impurities. The crystallization of orthorhombic β-MgSO4 · 7H2O, from low temperatu…
A trefoil-shaped liquid crystal containing an aromatic hetero-nucleus has been synthesized by the reaction of cyanuric chloride with 3,6-didecanoyl carbazole (DDC). The molecular structure was characterized by 1H NMR and 13C NMR spectroscopy, mass spectroscopy and elemental analysis. The core consists of 1,3,5-triazin…
Thermoset polyimides were prepared by thermally curing B-staged endcapped polyimide resins that were obtained by thermally baking PMR polyimide matrix resins. The polyimide matrix resins were prepared by incorporating flexible ether-bridged aromatic segments [–Ar–O–Ar–] into PMR polyimide backbone to improve their pro…
This study is performed to determine the characteristics of fabric sounds and the mechanical properties to predict their auditory comfort. In order to obtain quantitative information about emotional changes evoked by fabric sounds, physiological signals are acquired and analyzed when each fabric sound is presented to…
We present the design and performance tests of a miniaturized pulsed low-energy electron gun. Electrons photoemitted from a gold cathode are accelerated over a distance of 75 μm and then collimated by a microchannel plate. According to calculations, this novel concept will allow the time spread of the electron pulses…
Ga2Te3 has been prepared in bulk and thin film forms. The composition of films has been checked using energy dispersive X-ray (EDX) spectroscopy technique. X-ray diffraction (XRD) measurements have showed that the Ga2Te3 films evaporated at room temperature substrates were amorphous. Investigation of the I-V character…
A modified processing method for lead nickel niobate–lead zirconate titanate (Pb(Ni 1/3 Nb 2/3 )O 3 –Pb(Zr,Ti)O 3 , PNN–PZT) solid solutions is presented. This method is based on the high‐temperature synthesis of a precursor that contains all the B‐site cations (Ti, Zr, Ni, and Nb). This synthesis yields a diphasic mi…
Electrospray ionization (ESI) time-of-flight mass spectrometry has been used to investigate the pH-dependence of phosphomolybdates in solution from pH = 1.7 to 10.2. Mass spectra are reported for the first time for H 2 Na 2 P 2 Mo 5 O 23 2– , PMo 9 O 31 3– , PMo 10 O 34 3– , and PMo 11 O 37 3– . The pH dependence of p…
The photoluminescence (PL) spectra and optical excitation spectra of phosphors were obtained at temperatures of 10, 80, 300 and 370 K. Many narrow bands were observed in both the spectra, and were attributed to the transitions within the 4 f 8 electron configuration in Tb 3+ . The quenching of the 5 D 3 emission serie…
The effects of tetrakis(1-methylpyridinium-4-yl)porphyrinatomercury(II) [ Hg ( TMPyP )] 4+ (6) along with [ Pb ( TMPyP )] 4+ (7), [ Cd ( TMPyP )] 4+ (8), and [ H 2 ( TMPyP )] 4+ (1) (free base porphyrin) on DNA cleavage by Haemophilus aegyptius (HaeIII) have been studied using gel electrophoresis, UV-vis absorption sp…
Grafting of unsaturated vinyl monomers onto polypropylene (PP) is a convenient route to develop new polymeric materials with synergistic properties. Particular attention must be paid to the formation of graft copolymer relative to the formation of homopolymer, since the final properties are dependent both on the dispe…
Vibrational modes of adsorbates on rough metal films can show surface enhanced Raman scattering (SERS) as well as surface enhanced infrared (IR) absorption (SEIRA). Both effects are a consequence of field enhancement and of a so-called chemical effect. Our experiments show that chemical contributions to SERS and to SE…
The aim of the present study was to develop an analytical method for measuring amounts of a dendro[60]fullerene (DF) which is a highly water-soluble [60]fullerene derivative. We tried to define a straightforward methodology using capillary zone electrophoresis, a method which, to our knowledge, has not yet been used t…
The behaviour of composite laminates and tubes subjected to multiaxial fatigue loads is analysed and discussed. Experimental data taken from literature are compared to investigate the influence of the main design parameters on the multiaxial fatigue strength. The effects of biaxiality ratio, off-axis angle, phase angl…
Abstract We have performed a series of electron irradiation experiments with 300 keV electrons on thin (Mg1.8Fe0.2SiO4) olivine samples in situ in a transmission electron microscope. The irradiation-induced modifications occur in two distinct stages: firstly, stage 1 is the breakdown of olivine into small MgO crystall…
Abstract 1-Tetrathiafulvalenylferrocene and its derivatives have been synthesized in moderate to good yields employing palladium-catalyzed cross-coupling. The oxidation potentials of the title compounds revealed enhanced donor ability of the TTF unit, whereas the donor ability of the ferrocene moiety decreased markedl…
We present the frequency dependence of microwave-absorbing properties of La1−xSrxMnO3 (x=0.4, 0.5, 0.6, and 0.7) powders at room temperature. The absorbing properties change gradually with x in the frequency range of 8–12 GHz. The optimal absorption can be achieved for a x=0.4 sample and its microwave loss peak value…
Reaction of sodium with polycrystalline alumina (PCA) arc tubes in high‐pressure sodium lamps can limit lamp performance. The rate of degradation depends on the grain‐boundary diffusion of a reaction product, aluminum, through the PCA wall. The effects of sintering aids and other dopants on the sodium resistance of PC…