Materials Literature
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The effect of the plasma on heating the growth substrate in plasma enhanced chemical vapor deposition (PECVD) of carbon nanotubes is characterized for the first time. This effect, which is commonly ignored in the nanotube/nanofiber literature, is the sole heating mechanism in this work for catalyst pretreatment and gr…
Planar field effect transistors (FET) consisting of a large number of parallel single-walled carbon nanotubes (SWCNT) have been fabricated that allow very high on-currents of the order of several milliamperes and on/off ratios exceeding 500. With these devices it is demonstrated, for the first time, that SWCNTs can be…
Control and optimization of the polymorph formation in batch crystallization processes require in-situ quantitative measurement of the concentration of different polymorphs. In this study, Raman spectroscopy was chosen to measure the polymorphic fraction of l -glutamic acid ( l -Glu) in suspension. A sufficiently accu…
We demonstrate a scheme for optically patterning nuclear spin polarization in semiconductor/ferromagnet heterostructures. A scanning time-resolved Kerr rotation microscope is used to image the nuclear spin polarization that results when GaAs/MnAs epilayers are illuminated with a focused laser having a Gaussian profile…
There is great interest in the development of novel nanomachines that use charge, spin, or energy transport, to enable new sensors with unprecedented measurement capabilities. Electrical and thermal transport in these mesoscopic systems typically involves wave propagation through a nanoscale geometry such as a quantum…
The results of computer simulations of light scattering by a random array of small particles is presented. Results are given for arrays of particles situated randomly in a cubic, 3D sample $1.6μ$ on a side with particle numbers ranging from 100 to 937. The material parameters used correspond to ZnO and Ag, over the wa…
A simple and efficient approach is developed for the synthesis of copper oxide nanorods with different morphology and crystallographic structure. Polycrystalline fine rods 10−20 nm thick and several hundred nanometers long and single crystalline thick rods 60−100 nm thick and up to 1 μm long were obtained from the rea…
Quicklime or burnt lime (CaO), is a highly soluble liming material recognized as an acceptable means for neutralization of acid soils in the United States. Blending CaO and MgO with agricultural lime (CaCO3) may prove an alternative to ground agricultural limestone for raising soil pH and providing fertilizer Ca and M…
The use of intermetallic alloy precursors is explored as a new means to synthesize complex transition and refractory metal nitrides, carbides, and related phases. The conditions under which model single-phase Cr 3 Pt and two-phase Cr 3 Pt-dispersed Cr alloys form Cr 3 PtN antiperovskite when thermally nitrided were st…
Abstract The permeation, diffusion, and sorption of dimethyl ether into a series of commercial fluoroelastomers were characterized at various pressures and temperatures. The polymers under study were based on tetrafluoroethylene and contained various amounts of other perfluorinated monomers: perfluoromethylvinylether,…
Extensive studies on lipase catalyzed polymerization of ϵ‐caprolactone showed that porcine pancreas lipase (PPL) gave good conversions and molecular weights of the order of 11,000. Various attempts were also made to prepare higher molecular weight polycaprolactone esters and to increase the molecular weights of polyca…
We present and compare the results of temperature-dependent electron paramagnetic resonance (EPR) studies on Pr 1− x Ca x MnO 3 for x = 0.64, which is electron-doped, with results of studies on the hole-doped, x = 0.36 composition. The temperature dependence of the various parameters obtained from the powder and singl…
The effect of perfluoroalkane sulfonic acid on the flame retardancy of polycarbonate (PC) has been studied. In particular, the very small amount of additives to restrain the combustion, as well as the thermal degradation path, was focused on. The flaming combustion times of PC blended with 100 ppm of the strong acid s…
The title compound, dilanthanum dihydrogen hexamolybdoplatinate(IV) hexadecahydrate, La2[H2PtMo6O24]·16H2O, was obtained by reacting La(NO3)3·6H2O with a sodium salt solution of [HnPtMo6O24](8−n)− at pH 2.0, and it was found to crystallize in the monoclinic system in space group C2/c, with the polyanion having the le…
1,4-Anhydroerythritol ( 1a ) and 1,4-anhydro- l -threitol ( 1b ) were polymerized using trifluoromethanesulfonic acid (CF 3 SO 3 H) or fluorosulfonic acid (FSO 3 H) as a cationic initiator. The polymerizations of 1a and 1b proceeded through a ring-opening reaction with a proton-transfer reaction to produce hyperbranch…
The 13 C CP/MAS NMR, X-ray diffraction, and Raman spectroscopies were used for monitoring the structural transition of Samia cynthia ricini ( S. c. ricini ) silk fibroin induced by stretching. Here the silk fibroin was obtained from the aqueous solution stored in the silk gland. All of these spectroscopic data indicat…
This work reports the synthesis and electrical characterization of Bi4Ti3O12 ceramics produced successfully by a new method based on a CO2 laser sintering process. The structural and microstructural characterizations revealed that this method is able to produce sintered samples with high quality, free from secondary p…
The dynamics of soft colloidal particles in a concentrated suspension was studied by two color dynamic light scattering. The short-time diffusion coefficient, D(s)(q), revealed a weak slowing down around the peak of S(q) in contrast to the much stronger dependence observed in hard sphere systems, and the absence of an…
Oxidized, cut single-walled carbon nanotubes (SWNTs) have been reacted with lanthanide salts containing Eu, La, and Tb. These studies are aimed at developing a fundamental understanding of the coordination chemistry of metal ions and of metal ion complexes onto the surfaces of nanotubes. It has been found that the lan…
The effect of intermolecular hydrogen bonding on the crystallization kinetics and the morphology of poly(ε-caprolactone) (PCL)/4,4‘-thiodiphenol (TDP) blends with TDP content 0−20 wt % has been investigated by differential scanning calorimetry, polarizing optical microscopy, X-ray measurements, and in situ FT-IR. The…