Materials Literature
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An oriented, crystalline film of cellulose I was transformed into cellulose III I by supercritical ammonia treatment. These oriented, crystalline cellulose III I films were converted into cellulose I β crystalline film by heating in air for 1 h at 230 °C. This transformation process, from cellulose III I to I β, was s…
The hydration behavior of synthetic Na-magadiite was studied by combining thermal analyses, water adsorption gravimetry, X-ray diffraction, and infrared spectroscopy under controlled water pressure. Thermal analyses reveal, at least, two distinct water populations. The water adsorption isotherm exhibits two steps at l…
The free volume theory of Gerhardt et al. 1 ( J. Polym. Sci. B: Polym. Phys. 1998, 36, 1911) is used to predict viscoelastic scaling factors describing the effect of dissolved gas content on the viscosity curves of polystyrene melts swollen with dissolved carbon dioxide and dissolved 1,1-difluoroethane. The prediction…
Stöber silica particles having diameters of ca. 100 and ca. 200 nm were prepared and silylated using trimethylsilyl N, N -dimethylcarbamate, achieving a range of surface coverage by trimethylsilyl groups by varying the amounts of silylating agent used. The efficacy of silylation was characterized in terms of hydrophob…
Simple algebraic equations show that the bulk compressibility in spinel-type compounds can be expressed by means of cation oxide polyhedral compressibilities and a term that accounts for the pressure effect on the internal oxygen position in the unit cell. The equations explain (i) the difference of compressibilities…
We investigate the initial stages of hen egg-white lysozyme (HEWL) adsorption at a charged solid interface using Brownian Dynamics simulation. The protein is modeled at the atomistic level and the adsorption surface is represented by a planar array of positively charged sites. Adsorption reactions are simulated at neu…
In general, the relaxation of polymers from a nonequilibrium state will occur only if the polymer is above the bulk glass temperature. To examine the influence of a free surface on the mobility of polymer chains, the free surface of thick, artificially roughened polystyrene (PS) films (>10 μm) was studied. Each surfac…
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…