Materials Literature
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Electrochemically stimulated adenosine 5‘-triphosphate (ATP) release from poly(pyrrole adenosine 5‘-triphosphate) (PP-ATP) was investigated using cyclic voltammetry. Two separate redox processes at E 1/2 = −0.4 and 0.0 V were clearly elucidated by switching the film in polyelectrolyte solutions and found to correlate…
Cyclic enamides 1 of a type useful in the synthesis of naturally occurring chlorins, isobacteriochlorins, and corrins have been prepared by a process involving 5- exo - dig cyclization of the appropriate acetylenic amides 11 . The desired cyclization is catalyzed by either n -Bu 4 NF or LiAl(NHBn) 4 .
The oxidation of polyethylene surfaces with a range of mild oxidizing agents enhanced by the use of ultrasound is described. The use of sonochemical methods allows significant levels of surface modification to be achieved using oxidizing agents such as hydrogen peroxide and persulfate salts around ambient temperatures…
The intercalation of a cationic azobenzene derivative, p-(ω-(trimethylammonio)pentyloxy)-p‘-(dodecyloxy)azobenzene bromide, into montmorillonite and the photochemical reaction of the intercalated dye have been investigated. The adsorbed azo dye cations form the head-to-tail aggregates in the interlayer space of montmo…
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…