Materials Literature
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Vanadium pentoxide (V 2 O 5 ) thin films have been produced by pulsed laser deposition. AFM, Raman, optical and electrical measurements have been made on the films in order to understand the growth mechanism of laser ablated V 2 O 5 thin films. The investigations revealed the growth of stoichiometric and high-quality…
Abstract A soluble polyimide prepared from 7,7′‐bis(4‐aminophenoxy)‐4,4,4′,4′‐tetramethyl‐2,2′‐spirobichroman and 4,4′‐hexafluoroisopropylidenediphthalic anhydride was mixed with organo‐modified montmorillonite or synthetic mica in N,N ‐dimethylacetamide. The content of the clay minerals was 1, 2, and 4 wt %, respecti…
We use molecular dynamics to study the ordering of a nematic liquid crystal around a spherical particle or droplet. Homeotropic boundary conditions and strong anchoring create a hedgehog (radial point defect) director configuration on the particle surface and in its vicinity; this topological defect is canceled by nea…
Abstract The mechanical behavior of semicrystalline Nylon 11 was studied at strain rates between 10 −3 and 8800 s −1 . X‐ray diffraction and DSC were employed to examine the crystal structure and the crystallinity content. The as‐received material comprised a mixed structure of a predominately triclinic (α) form. DSC…
We present a study on the origin of twinning and antiphase domains and their relationship to charge ordering in ${\mathrm{La}}_{0.33}{\mathrm{Ca}}_{0.67}{\mathrm{MnO}}_{3}.$ The evolution of these orientational and charge-ordered domains is attributed to the reduction of the crystal symmetry due to the cubic to orthor…
Antifoam substances are used in various technologies and commercial products to prevent the formation of undesirable foam. A typical problem in their application is that an antifoam that is rather active in a given surfactant solution might be very inefficient for other foaming media at comparable conditions. The reas…
The solvothermal synthesis of the layered compound Mn 2 Sb 2 S 5 ·DAP (DAP = 1,3-diaminopropane) has been studied using in situ energy-dispersive X-ray diffraction. The results clearly demonstrate that the induction time strongly depends on the reaction temperature. At lower temperatures two crystalline intermediates…
A mixed quantum mechanics/molecular mechanics (QM/MM) model is used for investigating the nature of hydrogen adsorption in single-walled carbon nanotubes (SWNTs). For the QM part the B3LYP functional was used while for the MM we employ the universal force field (UFF). Our model includes up to 64 carbon and 32 hydrogen…
Abstract Adriamycin (ADR) was selected as a model drug to evaluate the potential applications of polylactide/poly(ethylene glycol)/polylactide (PLA/PEG/PLA) micelles as drug carriers in parenteral delivery systems. The PLA/PEG/PLA triblock copolymer micelles were characterized by dynamic light scattering and transmiss…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTQ-CdS Photoluminescence Activation on Zn2+ and Cd2+ Salt IntroductionDale E. Moore and Kaushik PatelView Author Information Department of Chemistry, Mercer University, Macon, Georgia 31207 Cite this: Langmuir 2001, 17, 8, 2541–2544Publication Date (Web):March 20, 2001Publicatio…
Using small-angle neutron scattering and liquid integral equation theory, we relate the structure factor of flexible dendrimers of fourth generation to their average shape. The shape is measured as a radial density profile of monomers belonging to a single dendrimer. From that, we derive an effective interaction of Ga…
Ag(CN) 2 - is reduced at a low rate by radiolytically generated hydroxymethyl radicals. The reduction occurs on tiny nuclei in solution formed by hydrolysis. When colloidal silver seed particles are present in the solution, the reduction of Ag(CN) 2 - is much faster, and larger silver particles with a narrow size dist…
Abstract Ultraviolet (UV) weathering performance of unpigmented and rutile titanium dioxide pigmented rigid polyvinyl chloride (PVC)/wood‐fiber composites has been studied. The composite samples were manufactured by dry‐blending PVC, wood fibers, and other processing additives in a high‐intensity mixer. The dry‐blende…
A generic finite-element based approach for predicting the behavior and properties of multiphase materials comprised of anisotropic, arbitrarily shaped and oriented phases is presented. The approach is exact in principle and effective in practice. It is the consistent use of periodic boundary conditions in the course…
The effect of low magnetic fields on the transport properties of a manganite compound with magnetic phase separation is studied. The different behavior obtained in samples of ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ related to the way in which the low field is applied is consistent with a picture of…
We present the results of measurements of the thermal conductivity of the quasi one-dimensional spin S=1/2 chain compound SrCuO_2 in the temperature range between 0.4 and 300 K along the directions parallel and perpendicular to the chains. An anomalously enhanced thermal conductivity is observed along the chains. The…
Novel abrasion-resistant nanocomposites based on poly(methyl methacrylate) (PMMA) as matrix and calcium carbonate (CaCO 3 ) nanopowder as filler have been prepared by an in situ polymerization process. The influence of nanopowders on the chemical−physical properties of the polymeric matrix have been investigated by pe…
Antiferroelectric materials are found to be good alternative material compositions for high-charge-storage devices and transducer applications. Lead zirconate (PZ) is a room-temperature antiferroelectric material. The antiferroelectric nature of PZ thin films was studied over a temperature range of 24–300 °C, in terms…
We have measured the hydrogen depth profiles in chemical-vapor-deposited diamond films by elastic recoil detection. Depth resolution of ∼0.23 nm is achieved using a high-resolution magnetic spectrometer. The hydrogen depth profile shows a sharp peak at surface, and the hydrogen coverage is estimated to be 1±0.3 ML, in…
We report on the thickness d dependences of the Seebeck coefficient, electrical conductivity, and Hall coefficient of PbTe and PbS epitaxial thin films (d=5–200 nm), prepared by thermal evaporation in vacuum and deposition on (001) KCl substrates. The oxidation of the films in air at 300 K leads to a sign inversion of…