Materials Literature
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We have studied charge injection across the metal/organic semiconductor interface in bottom-contact poly(3-hexylthiophene) (P3HT) field-effect transistors, with Au source and drain electrodes modified by self-assembled monolayers (SAMs) prior to active polymer deposition. By using the SAM to engineer the effective Au…
We report for the first time real time in situ and quantitative measurements of the mutarotation reaction of lactose in the solid state. The experiments have been performed by 13C NMR. We show that mutarotation is initiated on heating the amorphous state, and reaches chemical equilibrium close above the glass transiti…
This work reports on the synthesis of CrO2 thin films by atmospheric pressure CVD using chromium trioxide (CrO3) and oxygen. Highly oriented (100) CrO2 films containing highly oriented (0001) Cr2O3 were grown onto Al2O3(0001) substrates. Films display a sharp magnetic transition at 375 K and a saturation magnetization…
Abstract Raman spectroscopy has been used to study the doping processes in poly(3,4‐ethylenedioxythiophene) PEDOT prepared via conventional electrochemical methods. The initially doped PEDOT films resulting from the polymerization process were first dedoped before being further oxidized in different electrolyte soluti…
Electrospinning provides a simple approach to fabricating nanofibers and assemblies with controllable hierarchical structures. In this communication, we demonstrate that electrospinning can be combined with calcination to further maneuver the morphology and phase structure of nanofibers. More specifically, single-crys…
Abstract The improvement of the brittle behavior of Polylactic acid (PLA) resin was studied by blending it with Polycaprolactone (PCL) resin. These materials were fabricated into the compressed films and injection moldings. The values of tensile modulus and strength were appropriate, judging from the rule of mixtures.…
Silver products have been used for thousands of years for their beneficial effects, often for hygiene and in more recent years as antimicrobials on wounds from burns, trauma, and diabetic ulcers. Silver sulfadiazine creams (Silvazine and Flamazine) are topical ointments that are marketed globally. In recent years, a r…
We report an x-ray absorption fine structure study at the iodine-$K$ edge of the local structure in iodine-doped carbon nanotubes. The iodine-carbon host interaction is shown to be weaker in multiwalled carbon nanotubes (MWNTs) than in single-walled carbon nanotubes (SWNTs). Iodine species are only localized at the su…
Kinetics of the sigma-phase decomposition in three series of $\ensuremath{\sigma}\text{\ensuremath{-}}\mathrm{FeCr}$ intermetallic compounds caused by ball milling in a vibratory mill was followed by M\"ossbauer spectroscopy. It can be described by an exponential decrease with milling time. The decomposition leads to…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Abstract Summary: A set of four MCs (DS 1.80–1.95) has been analyzed with regard to their substituent pattern in the glucosyl units and along the polymer chain. The average heterogeneity of methylation observed for the entire material was analyzed in more detail after fractionation according to polarity. All fractions…
The ground electronic state (X 1A1) of tropolone has been examined theoretically by exploiting extensive sets of basis functions [e.g., 6-311++G(d,p) and aug-cc-pVDZ] in conjunction with the high levels of electron correlation made possible by density functional (DFT/B3LYP), Moller-Plesset perturbation (MP2), and coup…
Protein binding to implants is governed by the physicochemical properties of the biomaterial surface. The adhesion of a protein onto a solid surface is nonspecific. The aim of this study was to assess the adsorption process of fibrinogen at two different dental implants. The first biomaterial has a sand-blasted titani…
Layer-by-layer (LBL) polyelectrolyte films were constructed from poly(L-glutamic acid) (PGA) and poly(L-aspartic acid) (PAA) as polyanions, and from poly(L-lysine) (PLL) as the polycation. The terminating layer of the films was always PLL. According to attenuated total reflection Fourier transform infrared measurement…
In planar cellular systems m n denotes the average sidedness of a cell neighbouring an n -sided cell. Aboav's empirical law states that nm n is linear in n . A downward curvature is nevertheless observed in the numerical nm n data of the random Voronoi froth. The exact large- n expansion of m n obtained in the present…
Star-shaped aliphatic polyesters with hyperbranched cores were prepared by a two-step synthesis with the one-pot, arms-first core method. First, the polymerization of ε-caprolactone (CL) or L,L-lactide (LA) was initiated with aluminum isopropoxide trimer. Then, the resulting poly(CL)–OAl< or poly(LA)–OAl< living chain…
Fumarase (EC 4.2.1.2) from Corynebacterium glutamicum (Brevibacterium flavum) ATCC 14067 was purified to homogeneity. Its amino-terminal sequence (residues 1 to 30) corresponded to the sequence (residues 6 to 35) of the deduced product of the fumarase gene of C. glutamicum (GenBank accession no. BAB98403). The molecul…
Poly(ethylene glycol) and poly(trimethylene carbonate) block copolymers were prepared successfully at room temperature by the living ring-opening polymerization of trimethylene carbonate with poly(ethylene glycol) as an initiator in the presence of HCl·Et2O as a monomer activator.
The dense flow of air bubbles in a two-dimensional silo (through an aperture D) filled with a liquid is studied experimentally. A particle tracking technique has been used to bring out the main properties of the flow: displacements of the bubbles, transverse, and axial velocities. The behavior of the air bubbles is ob…
We investigated a simultaneous living anionic polymerization process of isoprene (I) and styrene- d 8 (S) in benzene- d 6 as a solvent with sec -buthyllithium as an initiator into polyisoprene(PI)- block -poly(styrene- d 8 ) (PS) and the polymerization-induced molecular self-assembling process. This process was observ…