Materials Literature
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Chiral 12-metallacrown-4 complexes can now be obtained in high yield using resolved β-phenylalanine hydroxamic acids as organic scaffolding. These new copper(II) compounds bear a striking resemblance based on size and shape to Cu(II) tetraphenylporphyrin. This suggests that metallacrowns may be useful alternatives to…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Transient Liquid Crystalline Phase as a Precursor for Crystallization in Random Co-polyester FibersG. E. Welsh, D. J. Blundell, and A. H. WindleView Author Information Department of Materials Science and Metallurgy, University of…
In an attempt to abstract the structural units of widely known silicate, phosphate, and arsenate compounds based on a transition-metal oxide (TM oxide) framework, we have gained some new insight into the study of “nanostructured” materials and their corresponding electronic and magnetic properties. In this review, we…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelective Population from the Excited Multiplet States to the Triplet Ground State in a Phthalocyanine: A New Concept for Controlling Magnetic Properties by PhotoexcitationKazuyuki Ishii, Yoshiharu Hirose, and Nagao KobayashiView Author Information Department of Chemis…
The genes encoding the enzymes in the (D)-glucarate/galactarate catabolic pathway have been identified in the Escherichia coli genome. These encode, in three transcriptional units, (D)-glucarate dehydratase (GlucD), galactarate dehydratase, 5-keto-4-deoxy-(D)-glucarate aldolase, tartronate semialdehyde reductase, a gl…
The aim of the paper is to provide the mathematical foundation of effective numerical algorithms for the optimal design of periodic binary gratings. Special attention is paid to reliable methods for the computation of diffraction efficiencies and of the gradients of certain functionals with respect to the parameters o…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCircularly Polarized Luminescence from Chiral Octadentate Complexes of Yb(III) in the Near-InfraredChristine L. Maupin, David Parker, J. A. Gareth Williams, and James P. RiehlView Author Information Department of Chemistry Michigan Technological University 1400 Townsen…
A methodology for preparing biodegradable films from egg white proteins was developed in this study. Film formation was based on the partial denaturation of egg white proteins by a preheating treatment at pH 10.5, followed by enzymatic polymerization of the proteins at 50 °C, pH 8.2, using a Ca 2+ -independent microbi…
Dielectric relaxation analysis was carried out on the main chain thermotropic liquid crystalline copolyesteramide Vectra B950. The dielectric spectra of Vectra B950 show four relaxations, instead of three as cited in the literature. These correspond, from high to low temperature, to the glass transition, the rotation…
The reorientation transition of the magnetization of ferromagnetic films is studied on a microscopic basis within Heisenberg spin models. Analytic expressions for the temperature dependent anisotropy are derived from which it is seen that the reduced magnetization in the film surface at finite temperatures plays a cru…
We analyze, by means of an RPA calculation, the conditions under which a mixture of oppositely charged polyelectrolytes can micro-segregate in the neighborhood of a charged surface creating a layered structure. A number of stable layers can be formed if the surface is sufficiently strongly charged even at temperatures…
Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection. In comparison with organic dyes such as rhodamine, this class of luminescent labels is 20 times as bright, 100 times as stable against photob…
Semiconductor nanocrystals were prepared for use as fluorescent probes in biological staining and diagnostics. Compared with conventional fluorophores, the nanocrystals have a narrow, tunable, symmetric emission spectrum and are photochemically stable. The advantages of the broad, continuous excitation spectrum were d…
We have synthesized highly hydrophilic, chemically responsive materials we call electroconductive gels. They are formed as an interpenetrating network of an electroconductive polymer and a hydrophilic hydrogel. Polymers were formulated form UV polymerizable hydrophilic monomer such as hydroxyethyl methacrylate (HEMA),…
It is generally agreed in the literature that transesterification leads to or enhances miscibility; that is, transesterification is a necessary condition for miscibility in the polyester blends. We present here, for the first time, indirect and direct experimental evidence to prove that this statement is not completel…
The disproportionation of aqueous hydrogen peroxide catalyzed by sodium tungstate has been investigated with regard to the multiplicity of the oxygen molecules released. Trapping experiments and detection of the IR luminescence of (1)O(2) have shown that the yield of (1)O(2) is virtually quantitative. The mono-, di-,…
The surface chemistry of two new groups of surfactant carboxyporphyrins is described. These materials exhibit well-behaved monomolecular films at an air−water interface. In compressed monolayers, the porphyrin ring appears to be oriented so that the plane of the ring is perpendicular to the surface. The surface-pressu…
Enzyme hydrolysis of zein−wax-coated paper was investigated as part of an effort to develop a recyclable waxed paper product. Brown Kraft paper was coated with corn zein and paraffin wax, and the grease proofing and water vapor barrier properties of the paper were determined. Grease permeation was found to depend on t…
A statistical model has been developed for the prediction of molecular weight and molecular weight distribution in transesterification reactions of diols onto polyesters (ideally polycondensated with a polydispersity of 2). The model was checked out on a transesterification reaction of PEG or diethylene glycol on PLLA…
The ultraviolet (3.8-eV) photolysis of atomically dispersed Rh I (CO) 2 species supported on an Al 2 O 3 surface in the presence of O 2 at 174 K has been studied by transmission infrared spectroscopy (FTIR). Dioxygen is activated on photochemically generated Rh I (CO) sites to produce oxidized rhodium carbonyl species…