Materials Literature
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Abstract Poly(L-lactic acid) (PLLA) is quite promising for use as biodegradable and non-petroleum derived plastics. In this study we developed an innovative two-step polycondensation process so as to produce economically PLLA with high molecular weight. The process is composed of both melt polycondensation under the l…
The cyclic voltammetric behavior of selected Keggin- and Dawson-type heteropolyanions has been studied as a function of electrolyte composition. The buffer capacity of the electrolyte is shown to be an important parameter that can be used to reveal the symmetry or dissymetry in charge distribution within each oxometal…
Variable-temperature X-ray diffraction was used to monitor the crystalline transition of Nylon 10 10. It could be found that the α-phase of the sample transforms into a γ-phase at about 135°C, if the sample is heated from room temperature to a high temperature, which is the so-called Brill transition of Nylon 10 10. I…
The artiticial neural network (ANN) and empirical models have been developed to predict the air permeability of needled fabrics with varying jute and polypropylene blend ratio, fabric weight and needling density. The fabrics were produced as per a statistical factorial design. The efficiency of prediction of the two m…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNon-Enzymatic Transcription of an IsoG·IsoC Base PairJohn C. Chaput and Christopher SwitzerView Author Information Department of Chemistry University of California Riverside, California 92521 Cite this: J. Am. Chem. Soc. 2000, 122, 51, 12866–12867Publication Date (Web)…
The development of stress during electromigration along Al lines, constrained within a dielectric in a coplanar test configuration, is measured. It is shown that, above a certain threshold current density, cracking of the dielectric is induced in the vicinity of the anode. Cracking of the dielectric leads to loss of m…
Petroleum distillates are not corrosive unless water and some other species are contained in them at particular concentrations. It was not found in the literature what water concentration and which species result in high corrosiveness of light petroleum distillates. The purpose of this study was to determine minimal (…
Single crystals of [Eu(C4H4O6)(H2O)2](H2O)2 were obtained from the combination of solutions of EuCl2, previously obtained by electrolysis of an aqueous solution of EuCl3, and tartraric acid, neutralized by LiOH. The crystal structure (orthorhombic, P212121, Z = 4, a = 948.9(1), b = 954.6(1), c = 1098.4(1) pm; R(F) = 0…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(arylene ether)s via Nitro Displacement Reaction: Synthesis of Poly(biphenylene oxide)s Containing Trifluoromethyl Groups from AB Type MonomersIm Sik Chung and Sang Youl KimView Author Information Center for Advanced Functional…
Optical excitation of a series of fully leaky guided modes has been used to explore the director distortion of a hybrid-aligned nematic liquid crystal with a negative dielectric anisotropy (Merck-BDH, MLC 6608) under application of an ac electric field. Hybrid alignment is realized by the use of a lecithin film on the…
Beim thermischen Abbau von La3F3[Si3O9] bei 700 °C im CsCl-Flux wurden Einkristalle einer neuen Form von La2[Si2O7] gefunden und in Fortsetzung der Felsche'schen Nomenklatur als H-Typ (triklin, P1; a = 681,13(4), b = 686,64(4), c = 1250,23(8) pm, α = 82,529(7), β = 88,027(6), γ = 88,959(6)°; Vm = 87,223(9) cm3/mol, Dx…
NaNO 3 , Synchrotron X-ray diffraction at 100 K: λ = 0.56Å, R -3c, a = 5.0655(5) Å, c = 16.577(3) Å, V = 368.4 Å 3 , Z = 6, F(000) = 78e, refinement on | F |. Anharmonic motion of N and O up to the fourth order of a Gram-Charlier expansion and multipoles for all ions were refined. R = 0.029, w R = 0.028, S 2 = 3.539,…
Two new macrobicyclic imidazolium and benzimidazolium phanes were synthesized by direct quaternization of the corresponding tripodal azacycles with tribromide under high dilution condition in excellent yields. The cyclophanes were identified by 1H-NMR, 13C-NMR, FAB-MS, IR, elemental analysis and X-ray diffraction anal…
A method for fabricating thin films of carbon nanocapsules and onion-like graphitic particles was reported. The method consists of cosputtering Ni and graphite, and subsequent thermal annealing in vacuum. Transmission electron microscopic and Raman studies revealed that the films were composed of Ni-filled carbon nano…
"Hollow" yams have been created to improve cotton yam properties, to increase the entrapped air in the yam, and to gain a stronger yam for spinning and weaving processes. Hollow yams are spun by introducing PVA filaments into the yam-forming zone of an experimental friction spinning apparatus. A 61/18-denier (6.8 tex)…
A technology to fabricate electrical contacts on individual single-wall carbon nanotubes has been developed, and electrical measurements are carried out below 4.2 Kelvin. The electrical transport property at low temperatures has basically been characterized as a quantum dot with a pronounced Coulomb blockade effect an…
We describe a systematic method for obtaining the coupling coefficients due to diffraction orders less than the grating order of second- and higher order resonant complex gratings in a multilayer structure. This method is based on an improved Green's function, and its distinguishing feature is its use of the transfer…
Sensibilisierte Nah-Infrarot-Lumineszenz (NIR-Lum.) wurde bei Lanthanoiden (Ln) erstmals beobachtet (siehe Schema; Exc.=Anregung). Ermöglicht wurde dies durch Energietransfer (ET) von Ferrocen- oder Tris(bipyridin)ruthenium-funktionalisierten lichtsammelnden Einheiten. Dank der Luminszenz des Triplettzustands des Ru-D…
A full analysis of thermal motion has been carried out for the negative thermal expansion material Sc 2 (WO 4 ) 3 over the temperature range 50−823 K. By obtaining neutron diffraction data from isotopically pure samples of the compositions Sc 2 ( 184 WO 4 ) 3, Sc 2 ( 186 WO 4 ) 3 and natural Sc 2 (WO 4 ) 3, coupled wi…
Polycarbosilane‐derived SiC fibers (Nicalon) were oxidized at 1773 K under oxygen partial pressures from 10 2 to 10 5 Pa. The effect of oxygen partial pressure on the oxidation behavior of the Nicalon fibers was investigated by examining mass change, surface composition, crystal phase, morphology, and tensile strength…