Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNovel Thin Film with Cylindrical Nanopores That Open and Close Depending on Temperature: First Successful SynthesisMasaru Yoshida, Masaharu Asano, Agneza Safranj, Hideki Omichi, Reimar Spohr, Johann Vetter, and Ryoichi KatakaiView A…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMain-Chain Ferroelectric Liquid Crystal Oligomers by Acyclic Diene Metathesis Polymerization1David M. Walba, Patrick Keller, Renfan Shao, Noel A. Clark, Marc Hillmyer, and Robert H. GrubbsView Author Information Department of Chemistry and Biochemistry and Optoelectron…
The microstructures of ferroelectric glass‐ceramics derived from (Pb,Sr,Ba)Nb 2 O 6 solid solutions have been investigated systematically using electron microscopy (TEM, SEM) and X‐ray diffraction (XRD). These data, together with the measured dielectric properties of the materials, have been correlated with both the s…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTDegradation of Microbial Polyesters: A Theoretical Prediction of Molecular Weight and PolydispersityJin-San Yoon, In-Joo Chin, Mal-Nam Kim, and Chulhee KimView Author Information Division of Chemical, Polymer, and Biological Engineering, Inha University, Inchon 402-751, Korea,…
Four new highly chlorinated porphyrins, 2,3,7,8,12,13,17,18-octachloro-5,10,15,20-tetrakis (3,5-dichloro-2,6-dimethoxyphenyl)porphyrin (H2tdcdmpp), [CoII(tdcdmpp)] and [M(tdcdmpp)Cl](M = FeIII or MnIII) have been prepared. The free base was synthesized by chlorination of H2tdmpp [5,10,15,20-tetrakis(2,6-dimethoxypheny…
Several alcohols were examined as substrates for the polyhydroxyalkanoate synthesis by Paracoccus denitrificans. The bacterium synthesized a homopolyester of poly(3-hydroxybutyrate) from ethanol. When n-pentanol was used as growth substrate, homopolyester poly(3-hydroxyvalerate) was synthesized, whereas copolyester po…
Surface modifications of Ar plasma-pretreated poly(tetrafluoroethylene) (PTFE) film were carried out via near-UV light-induced graft copolymerization with acrylic acid (AAc), Na salt of styrenesulfonic acid (NaSS) and N,N-dimethylacrylamide (DMAA). The structure and chemical composition of each copolymer surface and i…
The synthesis, X-ray structure, and magnetic susceptibility characterization of a hydroxo-bridged complex, (&mgr;-hydroxo)bis((tetraphenylporphinato)manganese(III)) perchlorate, {[Mn-(TPP)](2)(OH)}ClO(4), are described. The complex is readily prepared by a controlled hydrolysis of monomeric diaquo(tetraphenylporphinat…
The physical and chemical properties of polypyrrole (PPy) derivatized at the 3-position with dimethoxybenzyl and dihydroxybenzyl functionalities via a novel high-yield pathway were evaluated for pH response. The monomers were electrochemically polymerized with perchlorate dopant in a propylene carbonate electrolyte so…
Certain polydiene rubbers can be doped by iodine to become electrically conducting. In particular, the conductivity of trans -1,4-polybutadiene can be increased by 8 orders of magnitude upon conjugation and self-doping by iodine at room temperature, whereas cis -1,4-polybutadiene cannot be made conducting by reaction…
Magnetic and transport properties of single crystals of ${\mathrm{TbNi}}_{2}$${\mathrm{B}}_{2}$C have been investigated by ac susceptibility, dc magnetization, specific heat, and resistance measurements. The compound shows highly anisotropic magnetic properties which come about as a result of the Tb magnetic moments l…
PZT thin films for microsensors and microactuators were prepared from lead acetate and zirconium, titanium alkoxide solution by sol-gel processing. High-performance, crack-free, thin (3.1μm) films were acquired by multiple coating, and high-temperture annealing.PbO evaporation occurred on firing. This is caused by the…
A facile synthesis that combines the use of an easily polarizable thiophene ring and a ring-locked triene as efficient conjugating moieties is employed to simultaneously enhance molecular nonlinearity (as high as 13000 × 10–48 esu) and thermal stability; incorporating this highly nonlinear chromophore in polyquinoline…
Diaminopimelate dehydrogenase catalyzes the NADPH-dependent reduction of ammonia and L-2-amino-6-ketopimelate to form meso-diaminopimelate, the direct precursor of L-lysine in the bacterial lysine biosynthetic pathway. Since mammals lack this metabolic pathway inhibitors of enzymes in this pathway may be useful as ant…
Utilization of a Cs-promoted Cu/ZnO/Cr 2 O 3 catalyst as a first low-temperature bed and a Cs-promoted ZnO/Cr 2 O 3 catalyst as a second high-temperature bed significantly promoted the productivity of 2-methyl-1-propanol (isobutyl alcohol) from H 2 /CO synthesis gas mixtures. While the conversion of CO to C 2+ oxygena…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Characterization of H-Shaped PolyisopreneAbdelkrim Hakiki, Ronald N. Young, and Thomas C. B. McLeishView Author Information Department of Chemistry, The University of Sheffield, Sheffield S3 7HF, United Kingdom, and IRC in Polymer Science and Technology, The Unive…
Samarium cobalt nanoparticles were prepared by ball milling under argon, both with and without surfactant. X-ray diffraction indicated a single SmCo/sub 5/ phase, with an average size of 25 nm from Debye-Scherrer analysis of the peak widths, but a broad size distribution based on TEM. SQUID magnetometry yielded the co…
Hydrotalcite structures containing copper, magnesium and aluminium in the metal hydroxide layers have been investigated for their potential as precursors to the formation of catalysts for the decomposition and reduction of nitrogen oxides. These CuIIMgIIAlIII hydrotalcites are catalytically active towards both the dec…
Polymers grafted or otherwise immobilized at surfaces are often used to stabilize particle suspensions in situations where nonspecific colloidal forces or specific chemical bonds act to coagulate the particles. Although the motivation is clear, criteria for steric stabilization are not well established for environment…
Redispersion of sintered Pt (0.6−1.0%)/Al 2 O 3 catalysts at 773 K under HCl/H 2 O/O 2 /N 2 atmospheres was studied by hydrogen chemisorption, temperature-programmed reduction (TPR), transmission electron microscopy (TEM) and in situ X-ray absorption spectroscopy (EXAFS) experiments. TPR and H 2 chemisorption results…