Materials Literature
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Hexagonal, nonperovskite HoMnO 3 oxide, containing a triangular arrangement of Mn 3+ cations, has been prepared in polycrystalline form by the thermal decomposition of metal citrates. The crystal structure has been refined from neutron powder diffraction data. Magnetic and specific-heat measurements anticipate a compl…
The effects of doping, electron coherence, and electron correlation on the transport properties of boron-doped multiwalled carbon nanotubes are studied. Substitutional boron lowers the Fermi level of the tubes and increases the number of participating conduction channels without introducing strong carrier scattering.…
We present the crystal structure and low temperature electronic transport properties of the intermetallic commonly known as BeB_2. In contrast to the much simpler AlB_2-type structure of the 39K superconductor MgB_2, BeB_2 forms a complex structure type that is nearly unique in nature. The structure has 110.5 atoms pe…
We report the first Monte Carlo simulations of the morphology of asymmetric diblock copolymer thin films confined between two homogeneous and identical surfaces. The copolymers form a cylindrical morphology in the bulk. Exploratory bulk simulations have been conducted with judicious choices of the simulation box dimen…
The controversy whether or not he Kardar-Parisi-Zhang (KPZ) equation has an upper critical dimension (UCD) is going on for quite a long time. Some approximate integral equations for the two-point function served as an indication for the existence of a UCD, by obtaining a dimension, above which the equation does not ha…
The crystallization of nylon-6 from the melt was monitored in situ by X-ray diffraction. The nylon-6 was found to crystallize into a high-temperature α‘-phase as indicated by the two-peak nature of the diffractogram. On cooling from the crystallization temperature to room temperature, nylon-6 retained the two-peak nat…
Heterosupramolecular structures from CdSe or CdSe/ZnS core/shell nanocrystals and a specially designed organic fluorophore (diazaperylene) have been prepared to investigate the electronic interactions at nanoscopic semiconductor surfaces. To determine the average number of dye molecules per nanocrystal, we monitored t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn Efficient and Convenient Reaction Protocol to Organoimido Derivatives of PolyoxometalatesYongge Wei, Bubin Xu, Charles L. Barnes, and Zhonghua PengView Author Information Department of Chemistry, University of Missouri-Kansas City Kansas City, Missouri 64110 Departm…
This paper describes the use of surface plasmon resonance spectroscopy and self-assembled monolayers (SAMs) of alkanethiols on gold to evaluate the ability of surfaces terminating in different combinations of charged groups to resist the nonspecific adsorption of proteins from aqueous buffer. Mixed SAMs formed from a…
We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction (n) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips…
Abstract In the area of beverage packaging, the barrier properties (to gases, water, organic vapors/flavors) are parameters of great importance. For poly(ethylene terephtalate) (PET), largely used in bottling, the improvement of these barrier properties upon biaxial orientation is a direct result of both the level of…
An associating amphiphilic polyelectrolyte was used as an emulsifier of the n -dodecane−water system. First, the dynamic rheological behavior of polydisperse concentrated direct emulsions with dispersed phase volume fractions up to 0.91 was investigated. Both the Princen and Kiss ( J. Colloid Interface Sci. 1983, 91,…
${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}/{\mathrm{Sm}}_{40}{\mathrm{Fe}}_{60}/{\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ trilayers with in-plane uniaxial anisotropy induced by an applied magnetic field during deposition were prepared on (100)-Si substrates by dc magnetron sputtering. Magnetization hysteresis loops were measur…
The part played by the electronic interactions in the uncommon “neutral-to-ionic” (N-I) structural transition occurring in some mixed stack organic compounds, such as tetrathiafulvalene-chloranil (TTF-CA), is analyzed by ab initio electronic structure calculations. It is shown that the charge-transfer variation occurr…
Abstract A new kind of blends of polyvinyl chloride (PVC)/nylon terpolymer was reported in this article. Two compatibilizers were used in this study: one is a terpolymer of ethylene– n ‐butyl acrylate–monoxide (EnBACO); the other is terpolymer of EnBACO grafted with maleic anhydride (EnBACO‐ g ‐MAH). The observation o…
We report measurements and quantitative data analysis on the low-temperature resistivity of several ferromagnetic manganites. We clearly show that there exists a ${T}^{4.5}$ term in low-temperature resistivity, and that this term is in quantitative agreement with the quantum theory of two-magnon scattering for half-me…
Abstract The shear‐induced crystallization behavior of PET was investigated by measuring the time‐dependent storage modulus ( G ′) and dynamic viscosity (η′) with a parallel‐plate rheometer at different temperatures and shear rate. The morphology of shear‐induced crystallized PET was measured by DSC, X‐ray, and polari…
Bile acids have been used for the first time as the building block for the construction of dendritic units. Orthogonally functionalized 7-deoxycholic and cholic acid derivatives were synthesized. The construction of a bile acid heptamer, a nonamer, and a decamer using the convergent strategy are described in detail. C…
This paper reports polarization-resolved temperature-dependent Raman scattering measurements on single crystals of the orthorhombic perovskite colossal-magnetoresistive material La 1- x Ca x MnO 3 , with x = 0.1,0.275,0.3. It is demonstrated that two of the Raman lines undergo an anomalous softening as temperature is…
Poly(silyl ester)s with differing compositions and architectures were synthesized via cross-dehydrocoupling polymerizations of AB and AB 2 monomers. Three poly(silyl ester)s linear poly(dimethylsilyl benzoate), linear poly(diisopropylsilyl benzoate), and hyperbranched poly(dimethylsilyl benzoate) were synthesized thro…