Materials Literature
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A flexible chemical solution deposition (CSD) method for the preparation of magnetoresistive La 1−x (Ca,Sr)x MnO 3 thin films based completely on metal propionates is pre‐sented.A number of polycrystalline thin films with varying stoichiometries were deposited on different substrate ma‐terials at temperatures between…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTADMET Modeling of Branching in Polyethylene. The Effect of a Perfectly-Spaced Methyl GroupKenneth B. Wagener, Dominick Valenti, and Stephen F. HahnView Author Information Department of Chemistry, The George and Josephine Butler Poly…
We study mixtures of polymer solutions with particles whose diameter is much smaller than the radius of gyration of the polymer. They are found to demix when the polymer is semidilute and its correlation length is approximately equal to the particle's diameter. Protein purification using polymer solutions is shown not…
Ferroelectric Nd-modified lead-zirconate-titanate (PZT) thin films were fabricated as capacitor structures with platinum electrodes using pulsed laser ablation deposition. Single-crystal MgO (100) and thermally oxidized Si (100) were used as substrates. The ablation processes were carried out at room temperature in a…
The low‐temperature degradation of zirconia (ZrO 2 ) that was doped with 3 mol% yttria (Y 2 O 3 ) (3Y‐TZP) was prevented by the heat treatment of sintered specimens in nitrogen. The heat treatment of sintered specimens resulted in a surface layer that was stabilized by nitrogen ions, whereas the interior was only slig…
An automated system for controlling the interelectrode gap of the carbon arc and positioning the plasma, constructed from commercially available components, is described. The core components of the system are the linear photodetector array, analog, and digital integrated circuits, and two direct current motors. It all…
Flexoelectricity is a general and fundamental phenomenon in liquid crystals. It describes the linear coupling between an applied electric field and gradients in the director field. Whereas flexoelectricity has for decades been regarded as only of academic interest, we think it is time to point out its considerable app…
A chitin derivative having monodisperse 1 poly(2-alkyl-2-oxazoline) side chains, i.e., chitin- graft -poly(2-methyl-2-oxazoline) ( 1 ), was examined for miscibility with the commodity polymers poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVA). The miscibility of the blends was investigated by differential scann…
Abstract The macroscopic stress‐strain behavior of monoclinic polypropylene samples was investigated at 70°C under uniaxial tension and simple shear by means of a special videometric testing system that gives access to the constitutive equation of plastic behavior at constant strain rate up to large deformation. At se…
The particle‐growth kinetics of sodium niobate and zirconium titanate powders that were processed by the polymeric precursors method were studied. The growth kinetics that were studied for the particle, in the final stage of crystallization, showed that the growth process occurs in two different stages. For temperatur…
The surface-enhanced Raman scattering spectra and the photochemistry of 1,10-phenanthroline (phen) adsorbed on silver colloid were studied using a flow cell. Phen adsorbed on fresh colloid is found to undergo almost no photochemistry while the same molecule adsorbed on aged colloid appears to photodecompose to a speci…
The surface composition and free energy properties of two grades of amphiphilic and semicrystalline triblock copolymers consisting of a poly(dimethylsiloxane) (PDMS) midblock ( M w ∼ 2300) coupled to poly(ε-caprolactone) (PCL) end blocks having differing molecular weights ( M w ∼ 2000, sample P3, and M w ∼ 3000, sampl…
delta-(L-alpha-Aminoadipyl)-L-cysteinyl-D-valine synthetase (ACVS) from Penicillium chrysogenum was purified to homogeneity by a combination of (NH4)2SO4 precipitation, protamine sulphate treatment, ion-exchange chromatography, gel filtration and hydrophobic interaction chromatography. The molecular mass of ACVS was e…
Chemical structure investigations of polyurethane binders based on difunctional linear glycidyl azide polymer (GAP) cured with isophorone diisocyanate (IPDI) were performed using 13C-NMR spectroscopy in solution. Chemical functions such as urethane, urea, allophanate, and biuret were all expected to be detected in the…
The structural relaxation process in styrene-acrylonitrile copolymer has been characterized by means of differential scanning calorimetry (DSC) experiments. The results in the form of heat capacity, cp(T), curves are analyzed using a model for the evolution of the configurational entropy during the process recently pr…
We report a study of the effects of molecular weight on the structure and properties of poly(phenylene sulfide), PPS, crystallized from the rubbery amorphous state at temperatures just above the glass transition. PPS films were characterized using temperature-modulated differential scanning calorimetry (MDSC), small a…
An approach to fabricate lead titanate (PbTiO 3 ) films with preferred orientation on arbitrary substrates by a sol‐gel method was developed. To ensure a preferred crystallographic orientation on the substrates with different crystal structure, well‐defined platelet PbTiO 3 particles were used as seeds. Because the ba…
Annelated triple-calix[4]arene-based tetradecaether 1- (OMe) 14 is synthesized. Its three isomers, 1X- (OMe) 14, 1Y-(OMe) 14, 1Z-(OMe) 14, are isolated and characterized. The corresponding triarylmethyl carbopolyanion is prepared and oxidized to polyradical 1 . SQUID magnetometry for 1 in THF- d 8 /2-MeTHF gives S = 6…
A series of novel cycloolefin−maleic anhydride copolymers have been prepared and evaluated for 193 nm imaging applications. Free radical induced copolymerization of norbornene and maleic anhydride affords a hydrolytically robust alternating copolymer. Aqueous base solubility can be induced via incorporation of acrylic…
The thermal expansion in the radial direction (stacking axis of graphene sheets) of multiwall carbon nanotubes (MWNTs) is measured in the temperature range from 10 to 320 K. The sample includes in excess of 85% by weight of MWNTs. The radial thermal expansion of MWNTs is found to be almost the same with the c -axis th…