Materials Literature
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The polarization modulation infrared reflection−absorption spectroscopy (PM-IRRAS) technique has been used in situ to determine the orientation and molecular structure of an equimolar mixture of poly( l -lactide) (PLLA) and poly( d -lactide) (PDLA) spread at the air−water interface. The characteristics of the compress…
Plasma reforming and coupling of methane with carbon dioxide using a point-to-point type of reactor have been invested. A feed mixture of CH 4 and CO 2 could be converted mainly to CO, H 2, and C 2 H 2 at atmospheric pressure and without external heating except plasma heating. Under a condition of 200 mL/min of CH 4 a…
Nanocrystalline powders of ceria doped with 20 at. % of various rare-earth cations (Ce 0.8 RE 0.2 O 1.9, RE = La, Nd, Sm, Gd, Dy, Y, Ho, Er, and Yb) have been synthesized via coprecipitation using ammonium carbonate as the precipitant. The precursors and the resultant oxide powders were characterized by chemical analy…
We describe the evolution of the static and dynamic spin correlations of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ for $x=0.1,$ 0.125, and 0.2, where the system evolves from the canted magnetic state towards the insulating ferromagnetic state, approaching the metallic transition $(x=0.22).$…
Chemically capped CdS nanoparticles are embedded in porous silicon (PS) by a dip coating method. Atomic force microscopy measurements reveal that the PS surface is covered with CdS nanoparticles forming well-defined rectangular blocks of nearly uniform size (200 × 200 nm 2 ). Photoelectron spectroscopy and energy disp…
Abstract The influence of the degree of crystallinity and the syndiotacticity on the 1145, 1095, and 916 cm −1 bands was studied. The intensity of the 1145 cm −1 band increased with increasing syndiotacticity at a low degree of crystallinity and with an increasing degree of crystallinity for a sample with syndiotactic…
An attempt has been made to show the difference in the penetrability of coconut oil and mineral oil in human hair. We have used secondary ion mass spectrometry (SIMS) in combination with a time-of-flight (TOF) mass spectrometer. Characteristic ions formed by the pure components when bombarded with gallium ions have be…
The synthesis and living cationic ring-opening polymerization of 2-[3,4-bis(n-alkan-1-yloxy)phenyl]-2-oxazolines with alkan being tetradecan and pentadecan, i.e., (3,4)nG1-Oxz with n = 14 and 15, is described. The structural analysis of the resulting polymers with well-defined molecular weights and narrow molecular we…
Acellular polyanionic collagen materials intended for biomaterial and tissue engineering uses were prepared by the selective and controlled hydrolysis of carboxyamides from asparagine and glutamine residues of type I collagen present in pericardium, tendon, and intestinal submucosa, all from bovine origin. The increas…
We report the results of thermoelectric power (TEP) of a Cr doped ${\mathrm{La}}_{0.5}{\mathrm{Pb}}_{0.5}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3}$ $(x=0--0.45)$ system measured both in the presence and the absence of magnetic field $(B=1.5\mathrm{T}).$ The small field dependence of the Seebeck…
A hitherto unknown copolymer that contains sulfur in the backbone linking 3-hydroxybutyrate and 3-mercaptobutyrate by thioester linkages, poly(3HB-co-3MB), was synthesized by the polyhydroxyalkanoate-(PHA-) accumulating bacterium Ralstonia eutropha, when 3-mercaptobutyric acid was fed as the carbon source in addition…
We report the capability for forming silver nanoparticles from a single source of N -hexadecylethylenediamine silver nitrate complex that acts as both a metal ion provider and a particle protector. The formation of the metal−ligand complex and nanocomposite is evident from the similarity of a Fourier transform infrare…
The transport of photogenerated electrons in nanoporous TiO 2 electrodes is examined in a lithium perchlorate electrolyte solution by laser-induced photocurrent transient measurements. The diffusion coefficients of the photoelectrons are found to depend not only on electron density but also on the lithium ion concentr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTParallel (Face-to-Face) Versus Perpendicular (Edge-to-Face) Alignment of Electron Donors and Acceptors in Fullerene Porphyrin Dyads: The Importance of Orientation in Electron TransferDirk M. Guldi, Chuping Luo, Maurizio Prato, Alessandro Troisi, Francesco Zerbetto, Mic…
We studied the crystallization kinetics in a diblock copolymer system exhibiting different mesophase structures in the melt. A symmetric poly(ethylene oxide)- block -poly(1,4-butadiene) (PEO- b -PB) was blended with a low molecular weight PB homopolymer to yield the block copolymer blends containing lamellar, cylindri…
We report on the characterization of the morphological behavior expressed between the symmetric AB diblock and ABC triblock copolymer states. Experimentally, a gradual transformation between these states was achieved through systematic addition of PEO to a single symmetric PS−PI diblock copolymer (MW ∼ 18 800 g/mol),…
Resistivity of metals is commonly observed either to 'escalate' beyond the Ioffe-Regel limit (mean free path l equal to lattice constant a) or to 'saturate' at this point. It is argued that neither behavior is well-understood, and that 'escalation' is not necessarily more mysterious than 'saturation.'
A study on uranium and oxygen point defects in uranium dioxide using the ab initio plane-wave pseudopotential method in the local density approximation of the density functional theoretical framework is presented. Norm conserving pseudopotentials are used to describe oxygen and uranium atoms. The uranium pseudopotenti…
The fabrication of more and more miniaturized electronic and photonic devices relies on new, ingenious methods for the fabrication of spatially controlled nanostructures. Examples are electronic devices based on semiconducting nanowires and photonic devices based on chains of metallic nanoclusters that guide light by…
We have investigated the electronic properties of a C_60 molecule in between carbon nanotube leads. This problem has been tackled within a quantum chemical treatment utilizing a density functional theory-based LCAO approach combined with the Landauer formalism. Owing to low-dimensionality, electron transport is very s…