Materials Literature
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Polylactic acid is proving to be a viable alternative to petrochemical-based plastics for many applications. It is produced from renewable resources and is biodegradable, decomposing to give H2O, CO2, and humus, the black material in soil. In addition, it has unique physical properties that make it useful in diverse a…
The scanning electron microscope (SEM) is similar to the transmission electron microscope (TEM) in that they both employ a beam of electrons directed at the specimen. This means that certain features, such as the electron gun, condenser lenses and vacuum system, are similar in both instruments. However, the ways in wh…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Dendritic Caged Compounds: Synthesis, Mass Spectrometric Characterization, and Photochemical Properties of Dendrimers with α-Carboxy-2-nitrobenzyl Caged Compounds at Their PeripherySoichiro Watanabe, Mika Sato, Shigeru Sakamoto, Kentaro Yamaguchi, and Michiko Iwamu…
The time evolution of a phase-separated morphology in a binary polymer mixture involving a percolation-to-cluster transition (PCT) was investigated by a combined use of laser scanning confocal microscopy (LSCM) and light scattering (LS). We constructed three-dimensional images of phase-separating structures in the PCT…
Reductive amination of 6-deoxy-6-formyl-beta-cyclodextrin with 5-(p-aminophenyl)-10,15,20-tris(p-sulfonatophenyl)porphyrin in the presence of an excess of sodium cyanoborohydride affords the hydrophilic cyclodextrin-porphyrin conjugate 3 in 23% yield. The structure of 3 was confirmed by NMR spectroscopy and mass spect…
Ketopantoate reductase (EC 1.1.1.169) catalyzes the NADPH-dependent reduction of alpha-ketopantoate to D-(-)-pantoate in the biosynthesis of pantothenate. The pH dependence of V and V/K for the E. coli enzyme suggests the involvement of a general acid/base in the catalytic mechanism. To identify residues involved in c…
The synthesis by arc-melting techniques, the single-crystal X-ray structure, and the theoretical analysis of Gd4B3C4 are reported. It crystallizes in the triclinic space group P1 with a = 3.637(2) A, b = 3.674(2) A, c = 11.859(5) A, alpha = 93.34(5) degrees, beta = 96.77(5) degrees, gamma = 90.24(5) degrees, and Z = 1…
The effects of microbial transglutaminase (MTGase) on type I collagen self-assembly and properties of reconstructed collagen fibrils from shark were investigated. Collagen self-assembly was accelerated with the addition of MTGase in dependence on that concentration. The relative amount of reconstructed collagen slight…
A novel and simple procedure named photocalcination has been developed for removing organic components from mesostructured organic−inorganic composite films. This procedure employs an excimer lamp radiating vacuum ultraviolet (VUV) light of 172 nm in wavelength. Organic molecules are removed through two distinct photo…
The crystal structure and the magnetic properties of the compound [Cu(μ-oxalato-O,O‘)(H2O)(4-aminopyridine)2]n, the first transition metal extended structure that exhibits a bridging oxalate anion in a 1,1‘-cis-bidentate coordination mode, are reported.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSpiropyran Derivative of an Elastin-like Bioelastic Polymer: Photoresponsive Molecular Machine to Convert Sunlight into Mechanical WorkM. Alonso, V. Reboto, L. Guiscardo, A. San Martín, and J. C. Rodríguez-CabelloView Author Informa…
The surface species formed from the adsorption of 1,3-butadiene and 1-butene on Mo 2 N/γ-Al 2 O 3 catalyst have been characterized by in situ FT-IR spectroscopy with an attempt to get insight into the selective hydrogenation of 1,3-butadiene on transition metal nitride catalysts. 1,3-Butadiene adsorption on the Mo 2 N…
When dissolved in aqueous solution, α-lactose, whether originally in the anhydrous or the monohydrated form, readily undergoes mutarotation to yield the β isomer. At equilibrium, which is reached in 6.5 h at 292 K and more rapidly with increasing temperatures, the latter is present to the extent of ca. 60% w/w. At sat…
We report observation of inverted phases consisting of spheres and/or cylinders of the majority fraction block in a poly(styrene- b -butadiene- b -styrene) (SBS) triblock copolymer by solvent-induced order−disorder phase transition (ODT). The SBS sample has a molecular weight of 140K Da and a polystyrene (PS) weight f…
The present paper is devoted to the study of original trinuclear (CuII, LnIII, CuII) complexes (Ln = La, Ce, Gd). They derive from the polydentate ligands H2Li (i = 1, 3, 4) represented in Figure 1. The crystal and molecular structures of two complexes have been determined at room temperature. The (Cu, Gd, Cu) complex…
We show that the luminescence from CdSe quantum dot monolayers can be strongly influenced by the interaction of water molecules adsorbed on the surface. Light-induced alterations in the surface states following adsorption of water, results in quasi-reversible luminescence changes in the quantum dot. The excitonic QY i…
Carbon nanofibers (diameter range, 3–100 nm; length range, 0.1–1000 µm) have been known for a long time as a nuisance that often emerges during catalytic conversion of carbon-containing gases. The recent outburst of interest in these graphitic materials originates from their potential for unique applications as well a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPolyimide Thin Films Produced by Direct Solid-State Polymerization of an Amino Anhydride MonomerTimothy P. Bender and Zhi Yuan WangView Author Information Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa,…
The influences that both electron energy and density of a plasma bear on thin film formation are examined in the case of iodine-doped polyaniline polymerization. The plasma was produced by means of 13.5-MHz radiofrequency–generated glow discharges in low-pressure (ca. 10−2 mbar) air between electrodes. Four representa…
A series of cyclic metalloporphyrin trimers containing one Ru(II)-CO porphyrin center are synthesized. A stepwise convergent route is used to synthesize Ru(CO)Zn(2)2.Py3T, where tripyridyltriazine (Py3T) templates the formation of the trimer and forces the CO group to the outside of the cavity. Three mixed-metal trime…